J. Thomas Zaber, On Behalf Of Himself And All Others Similarly Situated Vs. City Of Dubuque, Iowa ( 2010 )


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  •                 IN THE SUPREME COURT OF IOWA
    No. 07–1819
    Filed June 4, 2010
    J. THOMAS ZABER, On Behalf of Himself
    and All Others Similarly Situated,
    Appellant,
    vs.
    CITY OF DUBUQUE, IOWA,
    Appellee.
    Appeal from the Iowa District Court for Dubuque County, Alan L.
    Pearson, Judge.
    City resident appeals from a district court ruling granting the city’s
    motion for partial summary judgment on plaintiff’s refund claim.
    AFFIRMED AND CASE REMANDED.
    Terry M. Giebelstein, Thomas D. Waterman, and Richard A.
    Davidson of Lane & Waterman LLP, Davenport, for appellant.
    Ivan T. Webber and James R. Wainwright of Ahlers & Cooney, P.C.,
    Des Moines, for appellee.
    Terrence L. Timmins, Des Moines, for amicus curiae Iowa League
    of Cities.
    Bruce H. Stoltze of Stoltze & Updegraff, P.C., Des Moines, and
    Brad A. Schroeder of Hartung & Schroeder LLP, Des Moines, for amicus
    curiae Iowa Trial Lawyers Association.
    2
    TERNUS, Chief Justice.
    The appellant, J. Thomas Zaber, appeals the district court’s
    dismissal by summary judgment of his claim for a refund of cable
    television franchise fees imposed by the appellee, City of Dubuque, in
    excess of the city’s cost of regulation. The district court ruled Iowa Code
    section 477A.7(5) (Supp. 2007) retroactively authorized these fees,
    rejecting the plaintiff’s contention section 477A.7(5) violated his due
    process rights.    We affirm the district court’s judgment in favor of the
    city.
    I. Scope of Review.
    Because this appeal arises from a ruling on a motion for summary
    judgment, we preface our discussion of the facts and issues with a review
    of the principles governing our examination of the district court’s ruling.
    “ ‘To obtain a grant of summary judgment on some issue in an action,
    the     moving   party   must   affirmatively   establish   the   existence   of
    undisputed facts entitling that party to a particular result under
    controlling law.’ ” Baker v. City of Iowa City, 
    750 N.W.2d 93
    , 97 (Iowa
    2008) (quoting Interstate Power Co. v. Ins. Co. of N. Am., 
    603 N.W.2d 751
    ,
    756 (Iowa 1999)); see Iowa R. Civ. P. 1.981(3) (authorizing summary
    judgment when “there is no genuine issue as to any material fact” and
    “the moving party is entitled to a judgment as a matter of law”). Neither
    party points to any issue of material fact with respect to the application
    of section 477A.7(5).     Thus, the disposition of this case rests on a
    determination whether the city is entitled to judgment as a matter of law
    under the undisputed facts.
    Whether the city is entitled to judgment as a matter of law turns
    on whether section 477A.7(5), which ratifies fees imposed and collected
    prior to its enactment, is a proper and constitutional exercise of
    3
    legislative power.      The plaintiff does not dispute that the legislature’s
    intent in enacting this provision was to retroactively authorize illegal
    franchise fees already assessed by municipalities and paid by their
    residents.     Rather, he claims the legislature’s action violates his due
    process rights. We consider the plaintiff’s constitutional claim de novo.
    Varnum v. Brien, 
    763 N.W.2d 862
    , 874 (Iowa 2009).
    II. Background Facts and Proceedings.
    The plaintiff, Thomas Zaber, sued the City of Dubuque on
    September 5, 2006, claiming the city had collected an illegal tax from
    him and others similarly situated in the form of franchise fees for gas
    and electric utilities and for cable television services in excess of the
    reasonable cost of regulating these industries. 1 Zaber sought a refund of
    the illegal taxes based on this court’s decision in Kragnes v. City of
    Des Moines, 
    714 N.W.2d 632
     (Iowa 2006). In that case, we held franchise
    fees assessed by the City of Des Moines on gas and electric power
    services constituted an illegal tax to the extent such fees exceeded the
    reasonable costs of regulating the franchised activity.                  Kragnes, 
    714 N.W.2d at
    642–43.
    The City of Dubuque filed a motion for partial summary judgment,
    requesting dismissal of the plaintiff’s claim for the refund of franchise
    fees paid for cable television services. This motion rested on the General
    Assembly’s enactment of Iowa Code section 477A.7, which authorized
    franchise fees on cable television services in excess of the cost of
    regulation, including fees “assessed by and paid to a municipality prior
    to May 29, 2007[, the effective date of the act].” Iowa Code § 477A.7(4),
    1This  case was certified as a class action pursuant to Iowa Rule of Civil
    Procedure 1.262(1). Nonetheless, we will refer to the plaintiff in his individual capacity
    for the sake of simplicity.
    4
    (5); see 2007 Iowa Acts ch. 201, § 15 (providing the act, “being deemed of
    immediate importance, takes effect upon enactment,” May 29, 2007).
    The plaintiff resisted this motion on the ground the retroactive aspect of
    the statute violated his due process rights in two ways: (1) it deprived
    the plaintiff of an accrued refund claim, and (2) the period of retroactivity
    exceeded the “modest” period constitutionally permitted.
    The district court granted the city’s motion for partial summary
    judgment on the plaintiff’s refund claim for cable television fees.                   It
    concluded the retroactive provision in the statute was curative legislation
    that bore a rational relationship to a legitimate governmental purpose,
    namely, preserving “the revenue cities need to carry out their lawful
    functions.”      The district court rejected the plaintiff’s due process
    challenge, ruling retroactive authorization of taxes already collected or
    assessed was constitutionally permissible and “need not be limited to one
    year or the previous legislative session,” as the plaintiff contended.
    The plaintiff filed an application for interlocutory appeal, which
    this court granted. 2      On appeal, the plaintiff claims the legislature’s
    retroactive authorization of franchise fees in excess of the cost of
    regulation violates his rights to substantive due process for two reasons.
    First, it takes away his accrued right to a refund of illegal taxes assessed
    and collected by the city. Second, the period of retroactivity exceeds the
    modest period that is constitutionally allowed.            To put these issues in
    context, we first review the events leading up to the enactment of section
    477A.7(5).
    2This case was consolidated for appeal with Curtis v. City of Bettendorf, No. 07–
    1856; Kleiman v. City of Waterloo, No. 07-1855; and Lindstrom v. City of Des Moines, No.
    07–1641. The clerk docketed the combined appeal under No. 07–1641. We have issued
    separate opinions in these cases.
    5
    III. Enactment of Iowa Code Section 477A.7(5).
    As noted above, in Kragnes, this court examined a municipality’s
    power to charge fees for gas and electric services in excess of the cost of
    regulating those activities. 
    714 N.W.2d at
    637–43. We held:
    Our decisions reveal that even after the adoption of the
    home-rule amendment and the enactment of the Home Rule
    for Cities bill, we have continued to adhere to the position
    that a fee imposed by a city needs to be related to the
    reasonable costs of inspecting, licensing, supervising, or
    otherwise regulating the activity in order to be permitted
    under a city's home-rule authority. If a fee charged by a city
    exceeds the amount necessary to inspect, license, supervise,
    or otherwise regulate the activity, it is nothing more than a
    tax levy, which the legislature has strictly prohibited.
    
    Id. at 641
    . We concluded that, to the extent the franchise fees charged
    by the defendant city exceeded its cost of regulation, the fees constituted
    an illegal tax.     
    Id.
     at 642–43.       In the wake of this decision, several
    lawsuits, including the present case, were filed by residents of various
    Iowa cities, claiming a five percent franchise fee for cable television
    services charged by the defendant cities was an illegal tax and should be
    refunded. See Lindstrom v. City of Des Moines, 
    470 F. Supp. 2d 1002
    ,
    1004–05 (S.D. Iowa 2007). 3
    While these actions were pending, the Iowa General Assembly
    enacted a law relating to franchise fees for cable television services. See
    2007 Iowa Acts ch. 201.             The following provisions of this act are
    pertinent to our discussion:
    4. A franchise fee may be assessed or imposed by a
    municipality without regard to the municipality’s cost of
    inspecting, supervising, or otherwise regulating the
    franchise, and the fees collected may be credited to the
    3Seven cases filed in state court seeking refunds of illegal “franchise fees” were
    removed to federal court, where they were consolidated.              See Lindstrom, 
    470 F. Supp. 2d at
    1004 n.1. Eventually, all seven cases, including the present case, were
    remanded back to state court for lack of federal court jurisdiction. 
    Id. at 1013
    .
    6
    municipality’s general fund and used for municipal general
    fund purposes.
    5. To the extent that any amount of franchise fees
    assessed by and paid to a municipality prior to the effective
    date of this Act, pursuant to a franchise agreement between
    a municipality and any person to erect, maintain, and
    operate plants and systems for cable television, exceeds the
    municipality’s reasonable costs of inspecting, supervising or
    otherwise regulating the franchise, such amount is deemed
    and declared to be authorized and legally assessed by and
    paid to the municipality.
    
    Id.
     ch. 201, § 8(4), (5) (emphasis added) (codified at Iowa Code
    § 477A.7(4), (5)). It is clear from the timing of the enactment and the
    language used in the statute that the legislature intended section
    477A.7(5) to validate any municipality’s collection of fees on cable
    television services in excess of the reasonable costs of inspecting,
    supervising, or otherwise regulating the franchise, regardless of when the
    fees were assessed and paid.
    The district court relied on the legislature’s authorization of past
    fees in subsection (5) in granting the city’s motion for partial summary
    judgment. It is the constitutionality of this retroactivity provision that
    lies at the heart of this appeal.
    IV. Nature of Issue Presented.
    Before we address the constitutionality of section 477A.7(5), we
    emphasize the issue presented involves taxes that were not authorized at
    the time they were exacted by the municipalities, 4 but which could have
    been authorized by the state. See Iowa Const. art. III, § 38A (“Municipal
    corporations are granted home rule power and authority . . . except that
    they shall not have power to levy any tax unless expressly authorized by
    4As  this case is before the court on interlocutory appeal, there has yet to be a
    final determination on the validity of the franchise fees assessed and collected by the
    municipality. For purposes of our review of the city’s motion for partial summary
    judgment, however, we assume the five percent franchise fee exceeded the cost of
    regulation and so, as to such excess, was not authorized.
    7
    the general assembly.” (Emphasis added.)). Therefore, we are not faced
    with a situation in which the legislature attempted to ratify or cure a tax
    that it lacked the underlying power to authorize. As we held in Kragnes,
    the defect in the city’s imposition of a tax on cable television services was
    simply its lack of legislative authority to do so. See Kragnes, 
    714 N.W.2d at 641
     (declaring similar charge on gas and electric services to be an
    unauthorized and illegal tax). Consequently, this case involves not the
    collection of taxes that government for constitutional reasons lacks the
    power to impose in some or all instances, but instead involves local taxes
    that the state has the power to authorize. In other words, this case and
    others like it do not involve battles between taxpayers and municipalities
    regarding the inherent power of government to tax.         Instead, the real
    conflict in this case is between the city and state government as reflected
    in legislation regarding the authority of municipalities to impose certain
    fees.
    In the end, the fundamental issue presented is whether the state
    as principal could exercise its power to ratify the unauthorized, but
    otherwise constitutional, acts of its political subdivisions. We turn now
    to a review of the principles that control our resolution of this issue.
    V. General Principles Governing Substantive Due Process
    Claims.
    To the extent that legislation is made retroactive, it is not
    inherently unconstitutional.    As this court has noted with respect to
    retroactive laws in general, “ ‘In the absence of an express constitutional
    inhibition retrospective laws are not prohibited as such.’ ” State ex rel.
    Turner v. Limbrecht, 
    246 N.W.2d 330
    , 334 (Iowa 1976) (quoting 73
    Am. Jur. 2d Statutes § 347, at 485–86), overruled on other grounds by
    State ex rel. Miller v. Hydro Mag, Ltd., 
    436 N.W.2d 617
    , 622 (Iowa 1989);
    8
    accord 2 Norman J. Singer & J.D. Shambie Singer, Statutes and
    Statutory Construction § 41:3, at 398 (7th ed. 2009) [hereinafter Singer on
    Statutory Construction] (“The fact that a statute is retroactive is not
    sufficient by itself to invalidate it.”).             The “express constitutional
    inhibition” claimed by the plaintiff in this case is the Due Process Clause.
    The plaintiff asserts the Due Process Clause is violated because the
    legislature’s ratification of the franchise fee deprives cable subscribers of
    a vested right to a refund of the illegally imposed fees, and the five-and-
    one-half-year period of retroactivity exceeds that which is constitutionally
    permitted. 5 These arguments implicate substantive due process. 6 See
    State ex rel. Miller v. Smokers Warehouse Corp., 
    737 N.W.2d 107
    , 111
    (Iowa 2007) (concluding defendants asserted substantive due process
    claim because “they do not discuss any notice or hearing deficiencies”).
    Generally speaking, “[s]ubstantive due process principles preclude
    the government ‘from engaging in conduct that “shocks the conscience,”
    or interferes with rights “implicit in the concept of ordered liberty.” ’ ”
    Atwood v. Vilsack, 
    725 N.W.2d 641
    , 647 (Iowa 2006) (considering state
    due process claim) (quoting United States v. Salerno, 
    481 U.S. 739
    , 746,
    
    107 S. Ct. 2095
    , 2101, 
    95 L. Ed. 2d 697
    , 708 (1987)); see also
    Blumenthal Inv. Trusts v. City of W. Des Moines, 
    636 N.W.2d 255
    , 265
    (Iowa 2001) (noting it “is not easy to prove” a substantive due process
    5The parties agree the plaintiff’s refund claims are governed by a five-year
    statute of limitations. See 
    Iowa Code § 614.1
    (4) (2005).
    6The plaintiff relies on both the Federal Constitution and our state constitution.
    See U.S. Const. amend. V; Iowa Const. art. I, § 9. The plaintiff does not suggest we
    should employ a different standard under the Iowa Constitution than we use for its
    federal counterpart. Although we make no distinction in our discussion of the plaintiff’s
    due process argument between the state and federal constitutional claims, we preserve
    our exclusive prerogative to determine the constitutionality of an Iowa statute
    challenged under the Iowa Constitution. Callender v. Skiles, 
    591 N.W.2d 182
    , 187
    (Iowa 1999).
    9
    violation because “ ‘substantive due process is reserved for the most
    egregious governmental abuses against liberty or property rights’ ”
    (quoting Rivkin v. Dover Twp. Rent Leveling Bd., 
    671 A.2d 567
    , 574–75
    (N.J. 1996))).
    A substantive due process analysis begins with an
    identification of the nature of the right at issue, as that
    determines the test to be applied. . . .      When . . . a
    fundamental right is not involved, the Due Process Clause
    “demands no more than a ‘reasonable fit’ between
    government[al] purpose . . . and the means chosen to
    advance that purpose.”
    Smokers Warehouse Corp., 
    737 N.W.2d at 111
     (citation omitted) (quoting
    Reno v. Flores, 
    507 U.S. 292
    , 305, 
    113 S. Ct. 1439
    , 1448–49, 
    123 L. Ed. 2d 1
    , 18 (1993)).
    As noted earlier, the plaintiff claims he was deprived of his right to
    a refund of fees imposed in excess of the city’s authority. The plaintiff’s
    right to a refund is not a fundamental right, and therefore, there need
    only be a “reasonable fit” between the legislature’s purpose in ratifying
    the past imposition of franchise fees and the means chosen to advance
    that purpose. See Home Builders Ass’n of Greater Des Moines v. City of
    W. Des Moines, 
    644 N.W.2d 339
    , 353 (Iowa 2002) (holding imposition of
    unauthorized fee did not infringe on a fundamental right, so rational-
    basis test applied). Additionally, we must presume the 2007 enactment
    is constitutional. Smokers Warehouse Corp., 
    737 N.W.2d at 111
    . This
    deferential standard is particularly appropriate when we consider the
    constitutionality of economic legislation.   Fed. Land Bank of Omaha v.
    Arnold, 
    426 N.W.2d 153
    , 156 (Iowa 1988).           Moreover, the “strong
    deference” accorded economic legislation “is no less applicable when that
    legislation is applied retroactively.” Pension Benefit Guar. Corp. v. R.A.
    Gray & Co., 
    467 U.S. 717
    , 729, 
    104 S. Ct. 2709
    , 2717, 
    81 L. Ed. 2d 601
    ,
    10
    611 (1984), superseded by statute on other grounds as stated in Orrego v.
    833 W. Buena Joint Venture, 
    943 F.2d 730
    , 735 n.7 (7th Cir. 1991). It is
    the plaintiff’s burden to prove the legislature’s act is unconstitutional by
    negating “ ‘every reasonable basis upon which the [act] may be
    sustained.’ ” Exira Cmty. Sch. Dist. v. State, 
    512 N.W.2d 787
    , 793 (Iowa
    1994) (quoting Kent v. Polk County Bd. of Supervisors, 
    391 N.W.2d 220
    ,
    225 (Iowa 1986)).
    VI. Classification of Legislation as Curative.
    As noted above, the district court decided section 477A.7(5) was a
    curative act that could constitutionally be applied retroactively.      The
    plaintiff claims this preliminary determination by the district court was
    wrong, leading the court to the erroneous conclusion that the statute
    could be applied retroactively to extinguish his claim to a refund. We
    think the district court correctly classified the provision at issue as a
    curative act.
    One type of curative act is a statute passed “to validate legal
    proceedings” or “acts of public . . . administrative authorities.” Singer on
    Statutory Construction § 41:11, at 503. In line with this general principle,
    our court has long recognized the legislature’s power to cure defects in
    acts by local government that are undertaken without authority or
    without compliance with the requirements for exercising authority. See,
    e.g., Schwarzkopf v. Sac County Bd. of Supervisors, 
    341 N.W.2d 1
    , 4–5, 8
    (Iowa 1983); City of Muscatine v. Waters, 
    251 N.W.2d 544
    , 548–50 (Iowa
    1977), superseded by statute on other grounds as stated in City of
    Des Moines v. City Dev. Bd., 
    473 N.W.2d 197
    , 199 (Iowa 1991); Cook v.
    Hannah, 
    230 Iowa 249
    , 253–59, 261, 
    297 N.W. 262
    , 264–67, 269, cert.
    denied, 
    314 U.S. 691
     (1941); Chicago, R.I. & P. Ry. v. Rosenbaum, 
    212 Iowa 227
    , 229–34, 238, 
    231 N.W. 646
    , 647–49, 651 (1930); Windsor v.
    11
    City of Des Moines, 
    110 Iowa 175
    , 179–80, 
    81 N.W. 476
    , 477 (1900);
    Chicago, R.I. & P. Ry. v. Indep. Dist. of Avoca, 
    99 Iowa 556
    , 561–62, 
    68 N.W. 881
    , 882 (1896); The Iowa R.R. Land Co. v. Soper, 
    39 Iowa 112
    ,
    116–24 (1874); Boardman v. Beckwith, 
    18 Iowa 292
    , 294–95 (1865).
    Although the plaintiff contends the legislature can only validate a
    defective exercise of power and cannot supply authority that did not exist
    at the time it was exercised, he is mistaken.
    One of our earliest cases dealing with curative tax legislation is
    Boardman v. Beckwith, 
    18 Iowa 292
     (1865). In Boardman, the legislature
    repealed the provisions of a law that allowed a county to levy and assess
    property taxes for the year of 1858. 18 Iowa at 293–94. During the next
    legislative session in 1860, the legislature passed a law to enforce
    delinquent taxes from 1858 that the county assessed and levied in 1858.
    Id. at 294. This court held the 1860 law was a curative act legalizing the
    taxes assessed and levied by the county in 1858. Id. at 294–95.
    Another decision dealing with the same issue is The Iowa Railroad
    Land Co. v. Soper, 
    39 Iowa 112
     (1874). In 1873 our court held a tax
    levied by Sac County for the purpose of paying a judgment rendered
    against the county was illegal. Soper, 39 Iowa at 114. Shortly after this
    decision, the legislature passed a bill legalizing the judgment taxes levied
    by the county in 1873. Id. at 114–15. A taxpayer challenged the tax,
    claiming the legislature did not have the authority to legalize the
    judgment tax. Id. at 118. In response to the taxpayer’s claim, we stated:
    [T]he General Assembly possesses the power to cure and
    render legal and valid, by subsequent laws, defective or
    irregular proceedings, wherever it would have the power to
    authorize such proceedings in the first instance. Since,
    therefore, it is within the proper scope of legislative authority
    to pass general laws for the assessment and collection of
    taxes, the passage of a general law curing and legalizing the
    levy and collection of taxes irregularly or illegally levied, is
    12
    also an exercise of legislative authority as essentially as is
    the passage of an original act authorizing the taxation.
    Id. at 124.      In reaching this conclusion, our court did not make a
    distinction between legislation that attempts to cure the acts of officers
    void for informality or mistake and legislation that seeks to legalize
    official acts void for want of authority.              Such a distinction is not
    recognized in this state. Id.
    In cases decided after Soper, we have continued to uphold curative
    acts ratifying taxes that had been imposed without authority. E.g., Cook,
    
    230 Iowa at 261
    , 
    297 N.W. at 269
    ; Rosenbaum, 
    212 Iowa at 238
    , 
    231 N.W. at 651
    . Therefore, under Iowa law, so long as the legislature had
    the power to confer authority on the local public body to so act, it has the
    power to cure or ratify the local body’s act exercised without the requisite
    authority. 7 See Singer on Statutory Construction § 41:11, at 504 (stating
    “a curative act may validate any past action which the legislature might
    have authorized beforehand”); id. § 41:15, at 514 (stating “legislative and
    administrative actions of . . . cities . . . may be validated by properly
    enacted curative statutes”).
    The present case clearly falls within this well-settled law. Under
    the Iowa Constitution, “[m]unicipal corporations are granted home rule
    power and authority . . . except that they shall not have power to levy
    any tax unless expressly authorized by the general assembly.”                      Iowa
    Const. art. III, § 38A (emphasis added). Here, the local body––the City of
    Dubuque––imposed a tax on cable television services that it had no
    7The  legislative act considered in City of Modesto v. National Med, Inc., 
    27 Cal. Rptr. 3d 215
     (Ct. App. 2005), can be helpfully contrasted. In that case the court held a
    municipal tax that violated due process and equal protection concepts in the state
    constitution could not be cured. City of Modesto, 27 Cal. Rptr. 3d at 223. This tax is
    an example of one that the government had no power to impose under any
    circumstances because its flaw was its discriminatory effect, not a simple absence of
    taxing authority by the taxing body.
    13
    authority to impose.    See Kragnes, 
    714 N.W.2d at 641, 643
     (declaring
    similar charge to be an unauthorized and illegal tax).            In the next
    legislative session, the legislature cured the lack of authority to collect
    such a tax by enacting section 477A.7(5) and by ratifying the taxes that
    had been previously assessed and paid. Because the legislature had the
    power to authorize this tax prior to May 29, 2007, it also had the power
    to validate unauthorized taxes imposed prior to this date.         Therefore,
    section 477A.7(5) is properly classified as a curative act. See State ex rel.
    Van Emmerik v. Janklow, 
    304 N.W.2d 700
    , 703 (S.D. 1981) (holding
    legislative act ratifying unauthorized collection of tax overcharge was a
    curative act).
    VII. Distinction Between Ratification            of   Past    Tax   and
    Retroactive Imposition of New Tax.
    Before we discuss whether section 477A.7(5) violates principles of
    substantive due process, it is helpful to understand the distinction
    between legislative ratification of a tax that has been previously assessed
    and collected, i.e., curative legislation, and legislation that imposes a new
    tax or liability on past transactions. The plaintiff relies on cases in the
    latter category, which involve fundamentally different considerations
    than those applicable to curative acts, as we will explain in more detail
    later in our opinion.
    The plaintiff claims the “leading modern case on a due process
    challenge to retroactive tax legislation” is United States v. Carlton, 
    512 U.S. 26
    , 
    114 S. Ct. 2018
    , 
    129 L. Ed. 2d 22
     (1994). While that statement
    may be true, it is also true that the legislation at issue in the case before
    us is not a retroactive tax statute like the one considered in Carlton. The
    Iowa legislature did not impose a tax on cable television services; it
    ratified a tax that cities had previously assessed. A tax statute imposing
    14
    a new tax, such as the one in Carlton, is fundamentally different than
    curative legislation ratifying or authorizing a tax that has already been
    imposed and collected, both in purpose and in its impact on taxpayers.8
    To demonstrate this distinction, we begin with an examination of the
    Carlton decision.
    The taxpayer’s claim in Carlton was based on changes made by
    Congress to the federal estate tax statute. 
    512 U.S. at 27
    , 
    114 S. Ct. at 2020
    , 
    129 L. Ed. 2d at 26
    .            In 1986, Congress adopted an estate tax
    deduction for the proceeds of sales of stock to employee stock-ownership
    plans.     
    Id.
       In 1987, Congress amended this deduction to close a
    loophole, limiting its availability to decedents who directly owned the
    securities that were sold immediately before death. 
    Id. at 29
    , 
    114 S. Ct. at 2021
    , 
    129 L. Ed. 2d at 27
    .                  Congress made this amendment
    retroactive, as if the limitation had been included in the original 1986
    8Notwithstanding     the distinctions between curative legislation and retroactive
    tax legislation, the test applied to retroactive tax legislation is the same as that applied
    to curative legislation, i.e., the test “generally applicable to retroactive economic
    legislation”:
    The due process standard to be applied to tax statutes with retroactive
    effect, therefore, is the same as that generally applicable to retroactive
    economic legislation:
    “Provided that the retroactive application of a statute is supported
    by a legitimate legislative purpose furthered by a rational means,
    judgments about the wisdom of such legislation remain within the
    exclusive province of the legislative and executive branches. . . .
    “To be sure, . . . retroactive legislation does have to meet a burden
    not faced by legislation that has only future effects. . . . ‘The retroactive
    aspects of legislation, as well as the prospective aspects, must meet the
    test of due process, and the justifications for the latter may not suffice
    for the former’ . . . . But that burden is met simply by showing that the
    retroactive application of the legislation is itself justified by a rational
    legislative purpose.”
    Carlton, 
    512 U.S. at
    30–31, 
    114 S. Ct. at 2022
    , 
    129 L. Ed. 2d at 28
     (emphasis added)
    (quoting Pension Benefit Guar. Corp., 
    467 U.S. at
    729–30, 
    104 S. Ct. at
    2717–18, 
    81 L. Ed. 2d at 611
    ).
    15
    provision. 
    Id.
     The impact of this law was that past transactions were
    now subjected to a greater tax than they were at the time the
    transactions occurred. In determining whether the retroactive aspect of
    the 1987 estate tax amendment met the requirements of due process, the
    Carlton Court noted the purpose of Congress was reasonable––to avoid “a
    significant and unanticipated revenue loss . . . by denying the deduction
    to those who had made purely tax-motivated stock transfers”––and the
    one-year period of retroactivity was “modest.”    Id. at 32, 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at 29
    .        The Court concluded the retroactive
    application of the tax statute was “rationally related to a legitimate
    legislative purpose” and, therefore, was “consistent with the Due Process
    Clause.” 
    Id. at 35
    , 
    114 S. Ct. at 2024
    , 
    129 L. Ed. 2d at 31
    .
    Contrary to the plaintiff’s assertion in his brief, the statute
    considered in Carlton was not a curative act. The plaintiff cites to the
    Court’s statement that the statute challenged in that case “was adopted
    as a curative measure.” 
    Id. at 31
    , 
    114 S. Ct. at 2022
    , 
    129 L. Ed. 2d at 28
    . It would be inaccurate to construe this comment as an indication
    that the tax statute considered in Carlton was considered a “curative act”
    as that term is specially defined under the law.        In concluding its
    discussion of the nature of the statute at issue in Carlton, the Court
    observed that “Congress acted to correct what it reasonably viewed as a
    mistake in the original 1986 provision that would have created a
    significant and unanticipated revenue loss.” 
    Id.
     at 31–32, 
    114 S. Ct. at
    2022–23, 
    129 L. Ed. 2d at 29
    .      Justice O’Connor, in her concurring
    opinion, noted the majority’s discussion of Congress’s “subjective
    motivation,” and observed:
    Every law touching on an area in which Congress has
    previously legislated can be said to serve the legislative
    purpose of fixing a perceived problem with the prior state of
    16
    affairs––there is no reason to pass a new law, after all, if the
    legislators are satisfied with the old one.
    
    Id. at 36
    , 
    114 S. Ct. at 2025
    , 
    129 L. Ed. 2d at 32
     (O’Connor, J.,
    concurring). Thus, the comment in Carlton with respect to the curative
    nature of the statute was really a reference to Congress’s purpose in
    enacting the statute––the correction of an unanticipated problem in the
    original legislation, not whether the statute was classified as a curative
    act for purposes of retroactivity analysis.   See Mont. Rail Link, Inc. v.
    United States, 
    873 F. Supp. 1415
    , 1421 (D. Mont. 1994) (stating, in
    reference to this discussion in Carlton, “the real issue identified by the
    Court and addressed in that discussion is whether the retroactive effect
    is supported by a legitimate purpose and furthered by rational means”),
    aff’d, 
    76 F.3d 991
     (9th Cir. 1996).
    A review of legal authorities considering when an act is curative
    confirms the conclusion that the tax statute at issue in Carlton was not a
    curative act. The question of when an act is “curative” for purposes of
    retroactivity analysis is addressed in Singers’ noted treatise on statutes
    and statutory construction, which states in its discussion of retroactivity:
    A curative act is a statute passed to cure defects in
    prior law, or to validate legal proceedings, instruments, or
    acts of public or private administrative authorities. In the
    absence of such an act the statute would be void for want of
    conformity with existing legal requirements.
    Singer on Statutory Construction § 41:11, at 503 (emphasis added); accord
    Schwarzkopf, 
    341 N.W.2d at 4
    ; Waters, 
    251 N.W.2d at 548
    . In Carlton,
    there was no defect in the original statute that would render it void.
    Congress simply realized in retrospect that the deduction it enacted in
    1986 was too broad.
    Our court recently recognized such a distinction––between the
    purpose of a legislative act and its classification for purposes of
    17
    considering its retroactivity––in Anderson Financial Services, LLC v.
    Miller, 
    769 N.W.2d 575
     (Iowa 2009). In Anderson Financial, the attorney
    general claimed an amendment to a credit statute was remedial in nature
    and, therefore, applied retroactively under the presumption that remedial
    statutes are presumed to have retrospective operation. 
    769 N.W.2d at
    579–80. We rejected this argument, stating:
    While the purpose of the law may be characterized as an
    effort to “remedy” an unintended gap in the statutory
    prohibition of usurious interest rates, the statute is not
    remedial in the sense contemplated by the rule that remedial
    statutes are presumed to apply retroactively. . . .
    ....
    . . . It would not be an exaggeration to suggest that the
    legislature nearly always has in mind some problem that it
    seeks to address in a legislative enactment. So, if a mere
    legislative purpose to remedy a perceived defect in the law
    made a statute remedial, very few statutes would not fall
    within this classification.
    
    Id.
     at 580 & n.4.
    The   same    distinction   is   appropriate   when   considering   the
    applicability of Carlton and similar cases cited by the plaintiff. Clearly,
    Congress’s purpose in enacting the 1987 amendment to the estate tax
    deduction at issue in Carlton was to remedy a perceived defect in the
    breadth of the deduction, but that is not the type of defect that is
    contemplated in classifying legislation as “curative” for purposes of
    retroactivity analysis. The type of defect addressed by a curative act, as
    defined for purposes of retroactivity analysis, is a failure of the prior
    legislation to conform to existing legal requirements. That was not the
    type of legislation involved in Carlton. In Carlton, Congress changed the
    law that applied to past transactions; it did not ratify a law that had
    already been applied to transactions when they occurred, as is the case
    18
    here. Thus, the amendment at issue in Carlton was not a “curative” act,
    as that term of art is used in the context of retroactivity.
    In summary, Carlton and like cases cited by the plaintiff address
    the retroactivity of a new tax––one that is being assessed and collected
    after enactment of the new statute, i.e., the tax is imposed after the event
    being taxed has occurred. 9 That is not what we have in the present case.
    Here the legislature did not enact a new tax; it ratified a prior tax that
    had been assessed and collected for many years before the legislature’s
    authorization of the tax. This distinction is one that makes a difference in
    retroactivity analysis. As our later discussion will illustrate, the purpose
    of curative, ratifying legislation is sufficient to justify longer periods of
    retroactivity in contrast to the so-called modest period of retroactivity
    accorded the imposition of a new tax.
    VIII. Application of Substantive Due Process Test.
    We turn now to the application of the substantive due process test
    identified earlier in our opinion.           As we have observed, due process
    9The cases cited by the plaintiff in support of his position, including the Iowa
    cases, involve tax statutes (statutes imposing a new tax), not curative acts (acts
    authorizing a previously imposed tax). See, e.g., United States v. Hemme, 
    476 U.S. 558
    ,
    
    106 S. Ct. 2071
    , 
    90 L. Ed. 2d 538
     (1986) (considering application of law that
    established unified credit for lifetime and testamentary gifts to gifts made prior to
    enactment); United States v. Hudson, 
    299 U.S. 498
    , 
    57 S. Ct. 309
    , 
    81 L. Ed. 370
     (1937)
    (considering application of tax on transfers of interest in silver bullion to transfers made
    before the adoption of the tax); Nichols v. Coolidge, 
    274 U.S. 531
    , 
    47 S. Ct. 710
    , 
    71 L. Ed. 1184
     (1927) (considering imposition of an estate tax on transfers that predated
    imposition of tax); Shell Oil Co. v. Bair, 
    417 N.W.2d 425
     (Iowa 1987) (considering
    application of statute disallowing a deduction to transaction occurring prior to adoption
    of statute, citing another tax statute case, Welch v. Henry, 
    305 U.S. 134
    , 
    59 S. Ct. 121
    ,
    
    83 L. Ed. 87
     (1938), which considered statute imposing an income tax on corporate
    dividends that had been received prior to adoption of tax); City Nat’l Bank of Clinton v.
    Iowa State Tax Comm’n, 
    251 Iowa 603
    , 
    102 N.W.2d 381
     (1960) (considering application
    of tax law to transaction that occurred prior to enactment of law, citing Welch, 
    305 U.S. 134
    , 
    59 S. Ct. 121
    , 
    83 L. Ed. 87
    ). Therefore, these cases are distinguishable from the
    present case, just as Carlton is, because the purpose of the tax statute considered in
    these cases is not the same as the purpose of curative legislation, such as that at issue
    in the case before us.
    19
    requirements are satisfied “simply by showing that the retroactive
    application of the legislation is itself justified by a rational legislative
    purpose.”    Pension Benefit Guar. Corp., 
    467 U.S. at 729
    , 
    104 S. Ct. at 2718
    , 
    81 L. Ed. 2d at 611
    . Here, the legislature’s purpose in ratifying
    cities’ past imposition and collection of franchise fees in excess of their
    regulatory costs was protection of the cities’ financial condition.       The
    legislature wanted to ensure cities could retain the franchise fees/illegal
    taxes they had previously collected, thereby avoiding economic hardship
    to the cities, their taxpayers, and the public who rely on city services if
    the cities were required to refund these fees. Given that cities had used
    the fees they had already collected for public expenditures, the
    legislature acted to avoid a situation in which cities would have to refund
    monies they had already spent.
    This    purpose––to   protect    the   financial   stability   of   local
    municipalities––is entirely consistent with “the positive policy . . . served
    by curative legislation, to sustain the reliability of official actions and
    secure expectations formed in reliance thereon.”         Singer on Statutory
    Construction § 41:11, at 506; see also id. § 41:17, at 521 (noting curative
    legislation as to tax matters is necessary “in order to safeguard the
    public treasury against erosion of revenues”). As one court has noted in
    denying a refund to taxpayers who had paid unauthorized county fees,
    later validated by the legislature, “If there are ‘settled expectations’ in
    this case, they are the County’s, not the taxpayers.” King v. Campbell
    County, 
    217 S.W.3d 862
    , 870 (Ky. Ct. App. 2006), review denied, (Ky.
    2007).
    Having identified the purpose of this act––protection of the public
    fisc, we now must consider whether this purpose justifies the retroactive
    aspect of the legislation––ratification of past franchise fees. It is at this
    20
    juncture that the distinction between tax statutes and curative acts
    becomes most important.       Unlike the revenue-raising tax statutes at
    issue in Carlton and like cases, which were designed to ensure tax
    collections remained at the same level or increased in the future, the
    curative act at issue here was designed to avoid the refund of monies
    already collected and spent. We agree with the district court that these
    purposes (maintaining revenue at the same or a higher level and avoiding
    refunds of past receipts) are fundamentally different. One need only put
    oneself in the position of the city to appreciate the distinction between
    the retroactivity of tax statutes versus the retroactivity of curative
    legislation. It is one thing to learn you will not be getting a raise as large
    as you anticipated and will have to adjust future expenditures
    accordingly (similar to allowing tax statutes limited retroactivity resulting
    in decreased future revenues); it is quite another matter to learn that you
    will have to return a portion of the income you have already received and
    spent (similar to the situation of denying retroactive authorization of
    taxes already collected and spent by the city).          Clearly, the latter
    situation provides a more compelling justification for retroactivity than
    does the former.
    Moreover, the fairness of retroactivity vis-à-vis the taxpayer is
    fundamentally different in these situations. In the context of retroactive
    tax legislation, the taxpayer has conducted himself in accordance with
    the laws in effect at the time of a particular transaction and then
    subsequently, due to the retroactivity of a new tax statute, is taxed on
    the past transaction. In contrast, when curative legislation is at issue,
    the taxpayer has entered into the transaction knowing the transaction is
    burdened with a particular fee or tax. Ratification of the tax or fee does
    not change the rules of the game after the taxpayer has placed his bet, as
    21
    is the case with retroactive tax legislation. See Charles B. Hochman, The
    Supreme Court and the Constitutionality of Retroactive Legislation, 
    73 Harv. L. Rev. 692
    , 704, 705–06 (1960) [hereinafter The Constitutionality
    of Retroactive Legislation] (noting “the interest in the retroactive curing of
    . . . a defect in the administration of government outweighs the
    individual’s interest in benefiting from the defect”); cf. Miller v. Johnson
    Controls, Inc., 
    296 S.W.3d 392
    , 401 (Ky. 2009) (allowing retroactive
    “clarification” of tax statute to conform to interpretation made by taxing
    authority, noting “the clear and lengthy notice, the lack of settled
    expectations and lack of detrimental reliance”), cert. denied, ___ U.S. ___
    (2010).
    The period of retroactivity justified by the purpose and effect of
    these clearly different statutes has been recognized by courts and
    scholarly authors alike.      In a Kentucky case, the court noted the
    situation in Carlton was “significantly different” from the facts presented
    in the Kentucky case in which the taxpayers sought refunds of fees the
    municipality had already collected. King, 
    217 S.W.3d at 870
     (concluding
    nineteen-year period of retroactivity did not violate taxpayers’ due
    process rights).    In his treatise, Singer also recognizes the singular
    nature of curative acts when he discusses the constitutionality of such
    legislation:   “[T]he very reason for curative legislation is to fulfill and
    secure expectations rather than to frustrate and defeat them.             The
    principles governing decisions about the validity of retroactive legislation
    do not work to render curative acts invalid.”          Singer on Statutory
    Construction § 41:12, at 509 (emphasis added).       Another author notes,
    “[c]ases involving the retroactive imposition of taxes must be treated
    separately” from curative statutes “which ratify prior official conduct of
    government officers who have acted without the requisite authority.” The
    22
    Constitutionality of Retroactive Legislation, 73 Harv. L. Rev. at 704, 706.
    Thus, it is inaccurate to suggest curative statutes are subject to the same
    retroactivity concerns and limitations as tax statutes.
    The justification for allowing curative acts to operate retroactively
    has been explained as follows:
    Non-substantive laws that operate retroactively help to
    rectify or prevent injustices that may have been caused by
    the previous law.        For example, so-called “curative
    legislation” will be upheld when the legislation: (1) ratifies
    prior official conduct of government officials who acted
    without the requisite authority, or (2) retroactively cures
    defects in an administrative system. Retroactive curative
    rules are acceptable because of the strong public interest in
    a fair government system, and because they merely produce
    the same result that would have occurred had the lawmaker
    (usually an agency) promulgated the original rule correctly.
    Jan G. Laitos, Legislative Retroactivity, 
    52 Wash. U. J. Urb. & Contemp. L. 81
    , 95 (1997) (footnotes omitted); accord Stephen R. Munzer, A Theory
    of Retroactive Legislation, 
    61 Tex. L. Rev. 425
    , 470 (1982) (suggesting
    retroactivity of curative legislation is justifiable because “[i]t tends to
    confirm expectations and to protect those who rely on the underlying
    merits of a claim rather than those who grasp at legal technicalities”);
    Laura Ricciardi & Michael B.W. Sinclair, Retroactive Civil Legislation, 
    27 U. Tol. L. Rev. 301
    , 338 (1996) (“Such curative legislation affirms as
    proper what everyone had taken to be the law anyway:              it ‘restores a
    situation that was affirmatively anticipated and provided for.’ ”). Thus,
    “[w]here   legislation   is   curative,    retroactive   application   may   be
    constitutional despite a long period of retroactivity.” Wiggins v. Comm’r
    of Internal Revenue, 
    904 F.2d 311
    , 316 (5th Cir. 1990).
    The United States Supreme Court long ago recognized the very
    distinction we note. In United States v. Heinszen, 
    206 U.S. 370
    , 
    27 S. Ct. 742
    , 
    51 L. Ed. 1098
     (1907), the Court reversed a judgment refunding
    23
    duties illegally collected on imports to the Philippine Islands under
    executive branch authority, relying on curative legislation passed by
    Congress. In 1898, the President imposed tariff duties on imports to the
    Philippine Islands.   Heinszen, 
    206 U.S. at 378
    , 
    27 S. Ct. at 743
    , 
    51 L. Ed. at 1100
    . In 1899, a treaty of peace was ratified, which had the
    effect of taking away the President’s power to impose these duties; yet the
    President continued the duties in force. 
    Id.
     Three years later, in 1902,
    Congress expressly authorized the imposition of duties. 
    Id. at 378
    , 
    27 S. Ct. at 743
    , 
    51 L. Ed. at
    1100–01. In 1905, the Supreme Court heard
    two appeals from parties who had been denied refunds of duties paid
    between 1899 and 1902, before the duties were authorized. 
    Id.
     at 380–
    82, 
    27 S. Ct. at
    744–45, 
    51 L. Ed. at
    1101–02. The Court reversed the
    judgments in favor of the government and held the President was without
    power to impose the duties after the treaty of peace was ratified in 1899.
    
    Id.
     Thereafter, in 1906, Congress passed an act legalizing and ratifying
    the collection of the unauthorized duties between 1899 and 1902. 
    Id.
    A year later the Heinszen appeal reached the Court. The district
    court in Heinszen had held duties paid by the claimants between 1899
    and 1902 were illegal and had refused to give effect to the 1906
    ratification of the unauthorized duties. 
    Id. at 382
    , 
    27 S. Ct. at 745
    , 
    51 L. Ed. at 1102
    . The claimants asserted on appeal that application of the
    ratifying act would deprive them of their property without due process of
    law, arguing they had a vested right in the monies illegally exacted from
    them.    
    Id. at 386
    , 
    27 S. Ct. at 746
    , 
    51 L. Ed. at 1104
    .     The Supreme
    Court noted the general principle that Congress “had [the] power to ratify
    the acts which it might have authorized.” 
    Id. at 384
    , 
    27 S. Ct. at 745
    , 
    51 L. Ed. at 1103
    .    Of particular significance to the present case is the
    Court’s refusal to consider the legalizing act as a taxing statute:
    24
    As to [the claim] the duties collected were illegal, it is
    insisted that, for the purpose of testing the validity of the act
    of Congress, the fact of such collection must be put out of
    view, and the act ratifying the exaction must be treated as if
    it were solely an original exercise by Congress of the taxing
    power. This being done, it is said, reduces the case to the
    inquiry, had Congress power, years after goods which were
    entitled to free entry had been brought into the Philippine
    Islands, to retroactively impose tariff duties upon the
    consummated act of bringing the goods into that country?
    But the proposition begs the question for decision, by
    shutting out from view the potential fact that when the goods
    were brought into the Philippine Islands there was a tariff in
    existence under which duties were exacted in the name of
    the United States. . . .    Moreover, the fallacy which the
    proposition involves becomes yet more obvious when it is
    observed that the contention cannot even be formulated
    without misstating the nature of the act of Congress; in other
    words, without treating that act as retrospective legislation
    enacting a tariff, when, on its very face, the act is but an
    exercise of the conceded power dependent upon the law of
    agency to ratify an act done on behalf of the United States,
    which the United States could have originally authorized.
    
    Id.
     at 385–86, 
    27 S. Ct. at 746
    , 
    51 L. Ed. at
    1103–04. The Court went on
    to reject the claimants’ due process claim, noting any right to a refund
    held by the claimants “was subject to the exercise by Congress of its
    undoubted power to ratify.” 
    Id. at 386
    , 
    27 S. Ct. at 746
    , 
    51 L. Ed. at 1104
    . The Court stated the fact that the instant suit was pending at the
    time Congress ratified the illegal duties did not “cause the statute to be
    repugnant to the Constitution,” as “[t]he mere commencement of the suit
    did not change the nature of the right.” 
    Id. at 387
    , 
    27 S. Ct. at 747
    , 
    51 L. Ed. at 1104
    .
    Heinszen was followed by the Court’s 1937 decision in Swayne &
    Hoyt, Ltd. v. United States, 
    300 U.S. 297
    , 
    57 S. Ct. 478
    , 
    81 L. Ed. 659
    (1937). In Swayne & Hoyt, steamship corporations challenged an order
    of the Secretary of Commerce canceling higher rates the corporations
    had been charging shippers through the Panama Canal.            
    300 U.S. at
    299–300, 57 S. Ct. at 478–79, 81 L. Ed. at 661–62.         The corporations
    25
    claimed, correctly, that the Secretary acted without authority, but the
    Court found Congress had subsequently validated the Secretary’s action
    through various legislative acts. Id. at 300–01, 57 S. Ct. at 479–80, 81
    L. Ed. at 662–63. As in Heinszen, the Court pointed out “a distinction
    must be taken ‘between a bare attempt of the Legislature retroactively to
    create liabilities for transactions . . . fully consummated in the past . . .
    and the case of a curative statute aptly designed to remedy mistakes and
    defects in the administration of government where the remedy can be
    applied without injustice.’ ” Id. at 302, 57 S. Ct. at 480, 81 L. Ed. at 663
    (quoting Graham v. Goodcell, 
    282 U.S. 409
    , 429, 
    51 S. Ct. 186
    , 194, 
    75 L. Ed. 415
    , 440 (1931)). The Court held “the retroactive application of
    the curative act impair[ed] no substantial right or equity of [the
    corporations]” and was not “unreasonable and arbitrary.” Id. at 302, 57
    S. Ct. at 480, 81 L. Ed. at 663–64.
    A review of the Van Emmerik case cited above is also helpful
    because it relies on Heinszen and has facts strikingly similar to the case
    before us.     See Van Emmerik, 304 N.W.2d at 701–05, 707.                In
    Van Emmerik, the state of South Dakota had collected a four percent
    sales tax on the sale of utility services beginning in 1969, even though
    the tax statute applicable to utilities imposed only a three percent tax.
    Id. at 701–02. In 1979, a class action seeking refunds of the one percent
    illegal tax was brought against the utilities and the state on behalf of all
    South Dakota residents who had paid the excessive sales taxes on their
    utility bills. Id. at 701. Thereafter, in 1981, the South Dakota legislature
    enacted a law imposing a four percent tax on utilities and making it
    retroactive to 1969. Id. at 702. The class action petitioner challenged
    the constitutionality of this legislation, claiming it constituted “a taking
    26
    of property without just compensation in violation of the Due Process
    Clauses of the Fifth and Fourteenth Amendments.” 10 Id. at 703.
    In addressing this claim, the South Dakota Supreme Court first
    noted that the act “purports to ratify the unauthorized collection by state
    officials of sales tax overcharges and to that extent, the law is a curative
    act.” Id. It rejected the petitioner’s argument that the utility customers
    had a right to a refund, stating:
    The unauthorized tax had been mistakenly collected without
    interruption since 1969 and petitioner presumably shared in
    whatever public benefits the tax funded. Where an asserted
    vested right that is not linked to any substantial equity
    arises from the mistake of officers purporting to administer
    the law in the name of the State, the Legislature is not
    prevented from curing the defect in administration simply
    because the effect may be to destroy claims that would
    otherwise exist. . . . Petitioner (having shared in the benefits
    10At  the time of this decision, the test of reasonableness for purposes of
    determining whether a taking had occurred was substantially the same as the test for a
    substantive due process claim. See Lingle v. Chevron U.S.A., Inc., 
    544 U.S. 528
    , 541–
    42, 
    125 S. Ct. 2074
    , 2083, 
    161 L. Ed. 2d 876
    , 889–90 (2005) (discussing evolution of
    takings analysis, noting its “reliance on due process precedents”). This court has also
    equated the two tests. In Home Builders, this court considered a claim that an illegal
    tax in the form of a park dedication fee constituted a Fifth Amendment taking. Home
    Builders Ass’n, 
    644 N.W.2d at 351
    . We concluded it did not because “the fees were
    ‘reasonably related to a substantial public purpose.’ ” 
    Id.
     (quoting Swisher Int’l, Inc. v.
    United States, 
    178 F. Supp. 2d 1354
    , 1362 (Ct. Int’l Trade 2001), aff’d, Arbon Steel &
    Serv. Co. v. United States, 
    315 F.3d 1332
     (Fed. Cir. 2003)). See generally Penn Cent.
    Transp. Co. v. City of New York, 
    438 U.S. 104
    , 127, 
    98 S. Ct. 2646
    , 2660, 
    57 L. Ed. 2d 631
    , 650 (noting “a use restriction on real property may constitute a ‘taking’ if not
    reasonably necessary to the effectuation of a substantial public purpose”), reh’g denied,
    
    439 U.S. 883
    , 
    99 S. Ct. 226
    , 
    58 L. Ed. 2d 198
     (1978), modification recognized by Palm
    Beach Isles Assocs. v. United States, 
    231 F.3d 1354
     (Fed. Cir. 2000). In considering the
    plaintiff’s substantive due process claim, we noted there must merely be “ ‘ a
    “reasonable fit” between governmental purpose . . . and the means chosen to advance
    that purpose.’ ” Home Builders Ass’n, 
    644 N.W.2d at 353
     (quoting ACCO Unlimited
    Corp. v. City of Johnston, 
    611 N.W.2d 506
    , 510 (Iowa 2000)). We concluded this test
    was met, stating, “[w]e have already determined in connection with our takings analysis
    that the parks fee is reasonably related to the City’s goal of establishing neighborhood
    parks. This conclusion also disposes of the plaintiff’s substantive due process claim.”
    Id. at 354. Thus, even though Van Emmerik involved a takings claim, the court applied
    substantially the same test we must employ in the present case for substantive due
    process.
    27
    funded by the tax) effectively seeks a windfall in claiming
    that a vested right has arisen here since, had the official
    action in question had the effect it was intended to and could
    have had, no such right would have arisen.
    Id. at 705; cf. Johnson Controls, 296 S.W.3d at 397 (holding taxpayers
    had no “vested right in the Kentucky Revenue Code”).           The court also
    held the petitioner’s claim that the law “is invalid due to its eleven and
    one-half year period of retroactivity . . . lack[ed] merit.”    Van Emmerik,
    304 N.W.2d at 706.             The court noted the temporal element of
    retroactivity is relevant to the fairness of applying the legislation
    retroactively. Id. (“The obvious reason for this concern is rooted in the
    principle that a person should be able to plan his conduct with
    reasonable certainty of the legal consequences.”).             Although this
    consideration is “[a]n important element” in cases involving “retroactive
    taxation,” the court noted, this principle of fairness was “not threatened
    here.”     Id.    Accordingly, the court gave full effect to the legislature’s
    ratification of eleven and one-half years of unauthorized taxation.        Id.
    The petitioner’s subsequent appeal to the United States Supreme Court
    was dismissed “for want of a substantial federal question.” Van Emmerik
    v. Janklow, 
    454 U.S. 1131
    , 
    102 S. Ct. 986
    , 
    71 L. Ed. 2d 285
     (1982).
    A more recent decision of the United States Court of Appeals for
    the District of Columbia Circuit is also factually on point. See Thomas v.
    Network Solutions, Inc., 
    176 F.3d 500
     (D.C. Cir. 1999), cert. denied, 
    528 U.S. 1115
     (2000). In this case, the National Science Foundation (NFS),
    an agency of the federal government, contracted with Network Solutions,
    Inc., a private corporation, to provide domain registration services for the
    Internet.        Id. at 504.   Pursuant to the contract, Network Solutions
    charged domain name registrants a yearly registration fee, with seventy
    percent of the fees kept by Network Solutions and the remaining thirty
    28
    percent deposited in an account on NFS’s behalf “for preserving and
    enhancing the ‘Intellectual Infrastructure of the Internet.’ ” Id. at 505.
    Plaintiffs, registrants who paid the annual registration fees, brought suit,
    seeking refunds of the so-called preservation assessment.             Id.   The
    district court held the preservation assessment “was an above-cost tax
    Congress had not authorized and hence was unconstitutional.”                Id.
    Congress immediately enacted a law that “legalized and ratified” the
    preservation assessment that had been illegally collected for over two
    years.     Id.   The district court then dismissed the plaintiffs’ claims as
    moot. Id. at 506.
    On appeal, the court of appeals considered the effect of
    Congressional ratification of the illegal tax.     Id.     Quoting Heinszen, it
    noted “that Congress ‘has the power to ratify the acts which it might
    have authorized’ in the first place, so long as the ratification ‘does not
    interfere with intervening rights.’ ”    Id. (quoting Heinszen, 
    206 U.S. at 384
    , 
    27 S. Ct. at
    745–46, 
    51 L. Ed. at 1103
    ).            The court affirmed the
    district court’s denial of the plaintiffs’ claim. 
    Id. at 512
    .
    An analogous case involving an act characterized as clarifying prior
    law is also enlightening. In Robert Morris College v. United States, 
    11 Cl. Ct. 546
    , 547 (Cl. Ct. 1987), a taxpayer sought a refund of FICA taxes
    paid for the years 1979–1983. These taxes were calculated pursuant to a
    1965 revenue ruling issued by the Department of Treasury interpreting
    the governing statute.       Robert Morris Coll., 11 Cl. Ct. at 547.        The
    taxpayer claimed the Department’s interpretation was inconsistent with a
    decision of the United States Supreme Court, Rowan Cos. v. United
    States, 
    452 U.S. 247
    , 
    101 S. Ct. 2288
    , 
    68 L. Ed. 2d 814
     (1981), and
    therefore, it was entitled to a refund of the erroneously paid taxes. 
    Id.
     at
    547–48. In 1983, Congress, concerned about the impact of Rowan on
    29
    taxes already collected, passed a law that in effect amended the
    governing statute to make it consistent with the revenue ruling. Id. at
    549, 551. In 1984, Congress made the 1983 statute effective for years
    prior to 1983 “to preclude the possibility of refunds of FICA taxes paid in
    conformity with [the revenue ruling].” Id. at 551.
    The taxpayer challenged the retroactive application of the new law,
    claiming it deprived the taxpayer “of its right to recover an overpayment.”
    Id. at 553. The taxpayer also claimed “that since the 1984 Act covers
    retroactively such a long period of time, it violates due process.” Id. The
    court rejected this claim, stating:
    Plaintiff was not deprived of any amounts to which it was
    entitled, nor did the legislation change its status by requiring
    plaintiff to pay additional amounts. Instead, Congress in
    pursuit of rational purposes––protection of the Social
    Security base and prevention of the potential disruption
    Rowan could cause––codified a revenue ruling which had
    been in force during the period in question.            Plaintiff
    complied with [this revenue ruling] throughout, and it
    should not be considered arbitrary or unfair that it cannot
    reclaim amounts paid to Social Security which it never
    expected to be refunded.
    Id. at 553–54; accord Canisius Coll. v. United States, 
    799 F.2d 18
    , 26–27
    (2d Cir. 1986), cert. denied, 
    481 U.S. 1014
     (1987); Temple Univ. v. United
    States, 
    769 F.2d 126
    , 135 (3d Cir. 1985), cert. denied, 
    476 U.S. 1182
    (1986); Johnson Controls, 296 S.W.3d at 401.
    A final case that is factually similar, and therefore helpful, is the
    Kentucky Court of Appeals’ King decision previously mentioned. In King,
    two counties had for many years imposed a “fee” on individual incomes
    and business net profits without giving those paying the fees a credit for
    similar city fees paid by the taxpayers. 
    217 S.W.3d at
    865–66. In 2001,
    taxpayers challenged the county fees, and the Kentucky Supreme Court
    held in 2004 that the counties should have been giving the taxpayers a
    30
    credit for city fees the taxpayers had paid. 
    Id.
     Based on this decision,
    the taxpayers filed an action on their own behalf and on behalf of all
    other persons who had paid the county fees seeking refunds of the
    excessive fees charged by the counties since 1986. 
    Id.
     In response to
    the same decision, the legislature enacted a law providing that no
    taxpayer was entitled to a refund for any overpayment and making the
    statute retroactive. 
    Id.
     at 866–67. The district court ruled the statute
    was not unconstitutional and dismissed the taxpayers’ suit for refunds.
    
    Id. at 865
    .
    On appeal, the appellate court held the statute precluding refunds
    of all excessive fees did not violate due process notwithstanding its long
    period of retroactivity, noting the legislature had enacted this provision
    “to shield [the counties] from what it believed could be the devastating
    [financial] consequences of the Supreme Court’s decision.”           
    Id. at 870
    (distinguishing    Carlton   as   dealing   with   a   situation   “significantly
    different”).   The court noted, “If there are ‘settled expectations’ in this
    case, they are the County’s, not the taxpayers.” Id.; see also Jasinski v.
    City of Miami, 
    269 F. Supp. 2d 1341
    , 1347 (S.D. Fla. 2003) (“When a
    legislative body, in good faith, enacts a curative law to ratify, validate and
    confirm any act that it could have authorized in the first place, . . . it
    would contravene public policy to award plaintiffs a windfall for asserting
    a cause of action that the legislative body may constitutionally eliminate
    by curing any defects in the law.”), aff’d, 99 Fed. App’x 887 (11th Cir.
    2004); Johnson Controls, 296 S.W.3d at 401 (upholding retroactive
    “clarifying” legislation denying taxpayer refunds, noting taxpayers’ “lack
    of settled expectations and lack of detrimental reliance”).
    The plaintiff claims the cases we have discussed are not good law
    in light of the United States Supreme Court’s decision in McKesson Corp.
    31
    v. Division of Alcoholic Beverages & Tobacco, 
    496 U.S. 18
    , 
    110 S. Ct. 2238
    , 
    110 L. Ed. 2d 17
     (1990). In McKesson, the Florida Supreme Court
    had ruled that a Florida “tax scheme unconstitutionally discriminated
    against interstate commerce,” but the court had refused to provide the
    taxpayer a refund for taxes it had already paid.              497 U.S. at 22, 
    110 S. Ct. at 2242
    , 
    110 L. Ed. 2d at 26
    . On certiorari to the United States
    Supreme Court, the Court held “the Due Process Clause requires the
    State    to     afford   taxpayers   a   meaningful      opportunity     to    secure
    postpayment relief for taxes already paid pursuant to a tax scheme
    ultimately found unconstitutional.” 
    Id. at 22
    , 
    110 S. Ct. at 2242
    , 
    110 L. Ed. 2d at
    26–27.
    Clearly, McKesson addressed the taxpayer’s procedural due process
    rights; it did not consider the validity of curative legislation under the
    doctrine of substantive due process.             Moreover, the tax at issue in
    McKesson was one that was inherently unconstitutional or illegal, one
    that the state had no power to authorize under any circumstances. As
    we have already noted, the tax at issue here was not one that was
    inherently unconstitutional; it had simply not been authorized by the
    legislature at the time it was assessed and paid. McKesson plainly does
    not stand for the proposition that principles of substantive due process
    are violated by the enactment of a curative statute that retroactively
    ratifies a taxing authority’s imposition of an otherwise permissible tax.
    See Atchison, Topeka & Santa Fe Ry. v. United States, 
    61 Fed. Cl. 501
    ,
    508 (Fed. Cl. 2004) (rejecting due process challenge to retroactivity of
    statute,      distinguishing   McKesson        from   cases    involving      curative
    legislation);     Johnson    Controls,   296    S.W.3d    at    402–03     (rejecting
    applicability of McKesson to due process challenge to legislature’s
    retroactive confirmance of state taxing authority’s interpretation of tax
    32
    statute).     Therefore, McKesson does not undermine the validity of the
    cases upon which we rely.
    In summary, then, the cases and legal authorities addressing the
    retroactive application of curative legislation establish: (1) ratification of
    a tax already imposed and collected cannot be equated with the
    retroactive imposition of a new tax for purposes of determining the
    constitutionality of retroactive application of a curative act, (2) curative
    acts do not impair any vested right of the taxpayer, 11 (3) there is no
    litmus test for a reasonable period of retroactivity for curative acts, and
    (4) ratification of a tax collected without authority is given full
    retroactivity so long as the retroactivity furthers a legitimate purpose.
    The legislative purpose behind the curative act in this case was
    clearly to allocate the burdens of government and to avoid financial
    disruption to the finances of the cities involved.                    Importantly, this
    situation in not one in which taxpayers have reasonably relied upon tax
    11We  note that Iowa law regarding the impairment of vested rights is consistent
    with the authorities we have discussed. In fact, the precise argument plaintiff makes
    here––that he has a vested right to a refund––was made and rejected in our early Soper
    case. 39 Iowa at 117–18. In that case, the plaintiff argued “that before the passage of
    the curative act, the plaintiff had a right of action to recover back the illegal taxes paid,
    and that this is a vested right.” Id. at 121. We rejected the plaintiff’s argument there
    and have continued to hold in subsequent cases that curative legislation ratifying an
    invalid exercise of governmental power, including previously imposed taxes, does not
    interfere with vested rights. Id. at 124; see Schwarzkopf, 
    341 N.W.2d at 8
    ; Iowa Elec.
    Light & Power Co. v. Inc. Town of Grand Junction, 
    221 Iowa 441
    , 452–53, 
    264 N.W. 84
    ,
    90 (1935); Rosenbaum, 
    212 Iowa at
    232–34, 
    231 N.W. at
    648–49; Chicago, R.I. & P. Ry.
    v. Streepy, 
    211 Iowa 1334
    , 1338, 
    236 N.W. 24
    , 26 (1931); Indep. Dist. of Avoca, 99 Iowa
    at 561–62, 68 N.W. at 882; Boardman, 18 Iowa at 294–95.
    The plaintiff places great reliance on our decision in Thorp v. Casey’s General
    Stores, Inc., 
    446 N.W.2d 457
     (Iowa 1989), in which this court held the retroactive
    application of an amendment to Iowa’s dramshop law that eliminated a plaintiff’s
    accrued tort claim deprived her of a vested right in violation of due process. Thorp, 
    446 N.W.2d at 462
    . We specifically noted in our decision, however, that a similar
    conclusion does not prevail when the retroactive legislation is a curative act. 
    Id.
     Such
    statutes, we stated, survive constitutional scrutiny even if they deprive a plaintiff of a
    vested cause of action. 
    Id.
    33
    law and structured their affairs in a fashion that is prejudiced by the
    retroactive legislation.      The fee payers in this case paid unauthorized
    franchise fees that were later ratified by the state. If the taxpayers in
    these municipalities had known that ratification would be forthcoming,
    they would not have altered their conduct in any material way.
    Certainly the legislature could have refused to ratify the acts of the
    cities, requiring the burden of tax refunds resulting from the unlawfully
    collected taxes to be borne by current city taxpayers, either in the form of
    increased taxes or reduced services.             Instead, however, the legislature
    decided to avoid these disruptions by retroactively ratifying the taxes
    already paid. 12      One may, of course, question the wisdom of these
    ratifying decisions on the ground that cities should be left to their own
    devices after pushing the tax envelope too far. The issue of the degree to
    which municipalities must be held on a short leash through a refusal to
    ratify unauthorized tax collections is generally a political question for the
    legislature to decide.       In this case, the legislature’s determination that
    the interest in stable municipal finances trumps the need to discipline
    city management does not amount to an arbitrary or irrational choice
    under the facts and circumstances.
    IX. Period of Retroactivity.
    As a backup argument, the plaintiff contends that, if we hold the
    legislature had the power to retroactively authorize the illegal taxes
    imposed by cities on cable television services, the retroactive application
    12Notably, no taxpayer has been arbitrarily or irrationally singled out for special
    treatment. See Commonwealth Edison Co. v. Will County Collector, 
    749 N.E.2d 964
    , 975
    (Ill. 2001) (upholding legislative act validating taxes predating effective date of
    legislation, noting the general assembly was not targeting any particular group of
    taxpayers “for retribution or other illegitimate purpose”); cf. Carlton, 
    512 U.S. at 32
    , 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at 29
     (concluding retroactive amendment to tax statute
    did not violate due process, in part, because “Congress’ purpose in enacting the
    amendment was neither illegitimate or arbitrary”).
    34
    of this authorization should be limited to “one year or the adjournment of
    the previous legislative session, May 3, 2006.” He claims courts applying
    Carlton use a “bright line one year rule as the constitutionally
    permissible period of retroactivity for state tax legislation.” The plaintiff’s
    suggestion that a one-year retroactive period approaches the due process
    limit is based on dicta in Justice O’Connor’s concurring opinion in
    Carlton. See Carlton, 
    512 U.S. at 38
    , 
    114 S. Ct. at 2026
    , 
    129 L. Ed. 2d at 33
     (“A period of retroactivity longer than the year preceding the legislative
    session in which the law was enacted would raise, in my view, serious
    constitutional questions.”) (O’Connor, J., concurring).
    In our view, however, Justice O’Connor’s comments were not
    meant to amount to a per se rule in all cases of every variety involving
    taxes.    Moreover, a majority of the Supreme Court in Carlton did not
    embrace a one-year rule, but instead provided a more flexible framework
    for deciding the due process question. See Montana Rail Link, Inc., 
    873 F. Supp. at 1421
     (rejecting plaintiff’s argument that all retroactive
    legislation must have a “short and limited period” of retroactivity, stating
    “in Carlton the Court did not establish a specific time frame for the
    validity of retroactive legislation”); Enter. Leasing Co. of Phoenix v. Ariz.
    Dep’t of Revenue, 
    211 P.3d 1
    , 5–6 (Ariz. Ct. App. 2008) (rejecting
    interpretation of Carlton as standing for proposition that “retroactivity in
    excess of one year . . . creates a due process issue” and holding six-year
    period of retroactivity did not violate due process), review denied, (Ariz.
    2009); Johnson Controls, 296 S.W.3d at 399 (rejecting “a specified
    modesty period,” noting eight of the nine justices in Carlton did not
    subscribe to a one–year limit on retroactivity); see also Canisius Coll.,
    
    799 F.2d at
    26–27   (rejecting   “a   one-year   bench   mark   as   the
    constitutional limit of retroactivity,” and holding four–year retroactive
    35
    application of curative statute was not violative of due process); cf. Licari
    v. Comm’r of Internal Revenue, 
    946 F.2d 690
    , 695 (9th Cir. 1991)
    (rejecting due process challenge to statute retroactively increasing tax
    penalty, noting a four-year period of retroactivity was not, by itself,
    sufficient to violate due process), aff’d, 
    946 F.2d 898
     (9th Cir. 1991);
    Temple Univ., 
    769 F.2d at 135
     (in case involving clarifying legislation
    applied retroactively to plaintiff’s tax returns going back six years, court
    stated, “no federal court of appeals has yet adopted an absolute temporal
    limitation on retroactivity,” citing case allowing a nine-year period of
    retroactivity). Moreover, to the extent Carlton stands for the proposition
    that tax statutes must have a certain period of retroactivity, that
    proposition is inapplicable here because the legislation authorizing the
    city’s franchise fees is a curative act.
    It is, of course, possible under the Iowa due process clause to
    adopt a different approach from the federal model.        Our recent cases
    emphasize that we jealously protect our right to engage in independent
    analysis of state constitutional claims, both with respect to the standards
    to be utilized and the application of those standards to the facts and
    circumstances of a given case. See, e.g., State v. Bruegger, 
    773 N.W.2d 862
    , 883 (Iowa 2009); Racing Ass’n of Cent. Iowa v. Fitzgerald, 
    675 N.W.2d 1
    , 6–7 (Iowa 2004). Here, however, the plaintiff does not propose
    a wholesale abandonment of established federal doctrine under the Iowa
    Constitution, but instead implies that the dicta in Justice O’Connor’s
    concurring opinion in Carlton should provide the basis for a decision in
    his favor under the Iowa Constitution.      This dicta does not present a
    basis for decision under the Iowa Constitution in light of the nature of
    the dispute presented here and the lack of detrimental reliance by the
    taxpayers.   While there are Iowa cases that suggest a short period of
    36
    retroactivity for tax legislation, these cases do not involve ratification of
    prior acts of municipalities by the state. See, e.g., Shell Oil Co. v. Bair,
    
    417 N.W.2d 425
    , 431–32 (Iowa 1987); City Nat’l Bank of Clinton v. Iowa
    State Tax Comm’n, 
    251 Iowa 603
    , 608–09, 
    102 N.W.2d 381
    , 384 (1960).
    Having rejected a rigid limit on the allowable period of retroactivity
    for curative legislation, we will consider the plaintiff’s argument that only
    a modest period of retroactivity can satisfy due process using the
    substantive due process principles outlined above.              As we have
    discussed, the purpose of the 2007 act passed by the Iowa legislature
    was to safeguard the financial stability of municipalities by ensuring they
    would not be required to refund substantial sums that they had already
    collected––and spent.    Clearly, the validation of past collections was a
    reasonable fit with this legislative purpose.         The plaintiff has not
    demonstrated why this purpose––to safeguard the public fisc––is
    advanced by allowing the city to retain the past one or two years of taxes,
    but not the past five and one-half years of taxes.                   See The
    Constitutionality of Retroactive Legislation, 73 Harv. L. Rev. at 704
    (“[W]hen dealing with curative statutes, the Court has consistently held
    that the legislative purpose is of itself sufficient to justify the concomitant
    retroactivity.”); cf. Rocanova v. United States, 
    955 F. Supp. 27
    , 30
    (S.D.N.Y. 1996) (holding six-year period of retroactivity for lengthened
    statute of limitations governing government claims for back taxes did not
    violate due process as “[t]he very purpose of the Amendment required its
    application to all existing tax liabilities”), aff’d, 
    109 F.3d 127
     (2d Cir.),
    cert. denied, 
    522 U.S. 821
     (1997); Johnson Controls, 296 S.W.3d at 401
    (rejecting due process challenge to 2000 statute that gave effect to taxing
    authority’s interpretation of tax statute from 1988 to 1994, an
    interpretation that was held erroneous by the Kentucky Supreme Court
    37
    in 1994). See generally Waters, 
    251 N.W.2d at 548
     (stating a curative act
    “ ‘is necessarily retrospective in character’ ” (quoting McSurely v. McGrew,
    
    140 Iowa 163
    , 172, 
    118 N.W. 415
    , 419 (1908))). Therefore, the plaintiff
    has not carried his burden to establish the unconstitutionality of the
    legislature’s action.
    X. Summary and Disposition.
    We recognize the result in this case makes litigation challenging
    municipal taxes that have not been authorized by the state less attractive
    as recovery of potential refunds may be cut off by the legislature. Yet,
    any municipality that imposes unauthorized taxes runs the risk of fiscal
    disruption in the event the legislature declines to ratify its actions. 13 If
    the legislature wishes to provide taxpayers with a mandatory recovery
    when unauthorized taxes are levied by local governments, it may do so
    through appropriate legislation. As even the Carlton Court stated with
    respect to the retroactive imposition of a new tax:
    “Provided that the retroactive application of a statute is
    supported by a legitimate legislative purpose furthered by a
    rational means, judgments about the wisdom of such
    legislation remain within the exclusive province of the
    legislative and executive branches. . . .”
    Carlton, 
    512 U.S. at
    30–31, 
    114 S. Ct. at 2022
    , 
    129 L. Ed. 2d at 28
    (quoting Pension Benefit Guar. Corp., 
    467 U.S. at 729
    , 
    104 S. Ct. at 2718
    ,
    
    81 L. Ed. 2d at 611
    ); accord Usery v. Turner Elkhorn Mining Co., 
    428 U.S. 1
    , 19, 
    96 S. Ct. 2882
    , 2894, 
    49 L. Ed. 2d 752
    , 768–69 (1976) (noting
    wisdom of retroactive application of statute imposing liability on coal
    mine operators for disabilities of former employees was “not a question of
    13We note the fees determined to constitute illegal taxes in Kragnes were
    imposed on gas and utility services. The legislation at issue here does not ratify such
    fees, and in fact, the plaintiff in this case has a pending claim for refund of gas and
    utility fees.
    38
    constitutional dimension,” and holding retroactivity was not a due
    process violation).   This court made a similar observation in State v.
    Miner, 
    331 N.W.2d 683
     (Iowa 1983), in considering a substantive due
    process challenge to economic regulation: “Our function is not that of a
    super-legislature which weighs the wisdom of legislation; we look only to
    whether the means chosen by the State are rational and reasonably
    necessary to the accomplishment of the State’s purpose.” 
    331 N.W.2d at 689
     (citation omitted). For the present, our legislature has reserved to
    itself the power to determine whether to ratify unauthorized local taxes
    on a case-by-case basis. We must defer to a constitutional exercise of
    that judgment.
    In summary, the legislature’s ratification of the city’s unauthorized
    tax is a curative statute whose purpose––to safeguard the public fisc and
    the financial stability of local municipalities––is rationally related to its
    retroactivity.   Therefore, this statute does not violate the plaintiff’s
    substantive due process rights. We affirm the district court’s summary
    judgment for the city on the plaintiff’s claim for a refund of fees paid on
    cable television services. We remand this case for further proceedings on
    the plaintiff’s claim for a refund of gas and utility fees.
    AFFIRMED AND CASE REMANDED.
    All justices concur except Wiggins and Hecht, JJ., who dissent.
    39
    #07–1819, Zaber v. City of Dubuque
    WIGGINS, Justice (dissenting).
    The facts of this case illustrate why many ordinary citizens distrust
    their elected officials.   In 2002 this court’s decision in Home Builders
    Ass’n of Greater Des Moines, established the proposition that any fees a
    city collects is an illegal tax when it charges franchise fees not
    reasonably related to the reasonable costs of inspecting, licensing,
    supervising, or otherwise regulating a franchised activity. Home Builders
    Ass’n of Greater Des Moines v. City of W. Des Moines, 
    644 N.W.2d 339
    ,
    347–48 (Iowa 2002).
    On May 2, 2005, the elected officials of the City of Dubuque
    enacted a cable franchise fee. Dubuque Mun. Code ch. 11, § 3A-7(1).
    Under existing Iowa law, the city should have known that such a fee is
    an illegal tax to the extent it exceeds the reasonable administrative costs
    of regulating the cable provider. The fee as enacted was due not to the
    city, but to cable providers who would disconnect a subscriber’s cable
    service if he or she refused to pay the illegal tax. Once the citizens of
    Dubuque realized the franchise fee was nothing more than an illegal tax,
    they brought this action to seek a refund.
    On May 26, 2006, this court issued the Kragnes decision. Kragnes
    v. City of Des Moines, 
    714 N.W.2d 632
     (Iowa 2006).         In Kragnes, this
    court held the citizens of a municipality could bring an action against the
    municipality for a refund of that part of a franchise fee paid by the
    citizens that exceeded the reasonable administrative costs related to gas
    and electric utility franchises. 
    Id.
     at 643–44. In response to Kragnes,
    the 82nd General Assembly passed a law authorizing franchise fees in
    excess of a city’s administrative costs and giving municipalities the right
    to retain the revenues it collected from the illegal tax.        Iowa Code
    40
    § 477A.7(5) (Supp. 2007). This law became effective May 29, 2007. 2007
    Iowa Acts ch. 201, § 15.
    I assume that in 2005, when the Dubuque City Council passed its
    franchise fee, the 81st General Assembly had neither the votes nor the
    political will to authorize the city to collect franchise fees on cable
    services in excess of the reasonable costs of inspecting, licensing,
    supervising, or otherwise regulating such services.     Subsequently, the
    82nd General Assembly, a legislative body not elected by the people at
    the time the Dubuque City Council levied and collected the illegal tax,
    decided the city could retain the revenues generated by the tax.        The
    actions of the 82nd General Assembly, authorizing the collection of the
    illegal tax retrospectively, compounded the unfairness of the actions of
    the Dubuque City Council when it enacted the tax without legislative
    authority. Such conduct by these elected officials completely disregarded
    the political will of the general assembly at the time the Dubuque City
    Council imposed the franchise fee on cable services. These actions are
    as repugnant to the American system of taxation as the concept of
    taxation without representation.
    The majority decision holds, a curative statute may, consistent
    with due process principles, authorize the unfettered retroactive
    application of an illegal tax so long as the purpose of the curative statute
    is to protect the public fisc.   Of course, any time a city must pay out
    funds the public fisc is at risk. Thus, under the majority’s decision, a
    curative statute authorizing the imposition and retention of an illegal tax
    can never be subject to a due process challenge.
    Taking the holding of the majority to its logical conclusion leads to
    the result that any act a legislative body had the power to enact, but did
    not authorize by formal legislative enactment, could be the subject of a
    41
    curative act and evade the requirements of the Due Process Clauses of
    the United States and Iowa Constitutions.        This reasoning is illogical,
    and its flaw is illustrated by the following example.
    The general assembly has the power to enact a fee on hunters.
    However, such a fee is nothing more than an illegal tax until a bill
    enacting such a fee is introduced in the general assembly, passed by a
    constitutional majority of the house and senate, and signed by the
    governor.    Suppose the department of natural resources decides the
    state’s financial situation requires more revenues and on its own, enacts
    a rule to collect an additional ten percent fee on hunting licenses without
    the authorization of a law enacting such an increase.           Because the
    legislature has not authorized this fee, it is an illegal tax. Under the logic
    of the majority, the department may collect and retain this tax without
    legislative authority so long as a subsequent general assembly enacts a
    curative act allowing the state to retain the illegal tax it previously
    collected.
    Moreover, a retroactive tax is a new tax whether the legislature
    enacts it as a curative statute or by other legislation. The effect is the
    same, the legislature is authorizing a governmental entity to collect and
    retain the revenues of a tax that the entity previously was not authorized
    to collect. The manner in which the legislature enacts a retroactive tax is
    a distinction without a difference.
    This does not mean, however, retroactive taxes necessarily violate
    the Due Process Clauses of the Federal or State Constitutions. See, e.g.,
    United States v. Carlton, 
    512 U.S. 26
    , 35, 
    114 S. Ct. 2018
    , 2024, 
    129 L. Ed. 2d 22
    , 31 (1994) (applying federal due process); United States v.
    Hemme, 
    476 U.S. 558
    , 571, 
    106 S. Ct. 2071
    , 2079, 
    90 L. Ed. 2d 538
    ,
    550 (1986) (same); United States v. Darusmont, 
    449 U.S. 292
    , 297–99,
    42
    
    101 S. Ct. 549
    , 552–53, 
    66 L. Ed. 2d 513
    , 517–19 (1981) (same); Welch v.
    Henry, 
    305 U.S. 134
    , 149–51, 
    59 S. Ct. 121
    , 126–27, 
    83 L. Ed. 87
    , 94–95
    (1938) (same); United States v. Hudson, 
    299 U.S. 498
    , 500–01, 
    57 S. Ct. 309
    , 310, 
    81 L. Ed. 370
    , 372 (1937) (same); Shell Oil Co. v. Bair, 
    417 N.W.2d 425
    , 431–32 (Iowa 1987) (same); City Nat’l Bank of Clinton v.
    Iowa State Tax Comm’n, 
    251 Iowa 603
    , 608–09, 
    102 N.W.2d 381
    , 384
    (1960) (applying state and federal due process principles).
    The   most   recent   Supreme      Court   decision   to   address   the
    retroactivity of a tax is Carlton. In Carlton, a taxpayer relied on the Tax
    Reform Act of 1986 to exclude from federal estate taxation one-half of the
    proceeds from the sale of securities to an Employee Stock Ownership
    Plan. Carlton, 
    512 U.S. at 28
    , 
    114 S. Ct. at
    2020–21, 
    129 L. Ed. 2d at
    26–27. In January 1987, after the taxpayer made the sale, the Internal
    Revenue Service (IRS) issued a notice stating it would not recognize such
    a deduction unless the decedent directly owned the stock immediately
    prior to his or her death. 
    Id. at 29
    , 
    114 S. Ct. at 2021
    , 
    129 L. Ed. 2d at 27
    .   In December 1987 Congress enacted a statute codifying the
    substance of the IRS notice. 
    Id.
     The IRS then disallowed the deduction
    because the decedent did not own the stock immediately before her
    death. 
    Id.
     The taxpayer paid the deficiency, filed a claim for a refund,
    and instituted a suit for refund arguing the government’s retroactive use
    of the December 1987 law to deny a deduction available to the taxpayer
    when the taxpayer made the sale violated the Due Process Clause of the
    Fifth Amendment to the United States Constitution. 
    Id.
    Prior to Carlton, the Supreme Court determined the validity of a
    retroactive tax statute under the Due Process Clause by determining
    whether its “ ‘retroactive application is so harsh and oppressive as to
    transgress the constitutional limitation.’ ” 
    Id. at 30
    , 
    114 S. Ct. at 2022
    ,
    43
    
    129 L. Ed. 2d at 28
     (quoting Welch, 
    305 U.S. at 147
    , 
    59 S. Ct. at 126
    , 
    83 L. Ed. at 93
    ).      In applying the harsh and oppressive test, the Ninth
    Circuit in Carlton, considered two factors. Carlton v. United States, 
    972 F.2d 1051
    , 1059 (9th Cir. 1992), rev’d, 
    512 U.S. 26
     (1994). These factors
    are “[f]irst, did the taxpayer have actual or constructive notice that the
    tax statute would be retroactively amended? Second, did the taxpayer
    rely to his detriment on the pre-amendment tax statute, and was such
    reliance reasonable?”        
    Id.
         A third factor used by courts prior to the
    Supreme Court’s decision in Carlton in determining whether a retroactive
    application of a tax meets due process requirements was whether
    Congress     acted    promptly           and   established   a   modest     period    of
    retroactivity. Darusmont, 
    449 U.S. at
    296–97, 101 S. Ct. at 551–52, 
    66 L. Ed. 2d at 517
    .
    After applying the factors of the harsh and oppressive test, the
    Ninth     Circuit    found         the    retroactive   application    of    the     tax
    unconstitutional.     Carlton, 
    972 F.2d at 1062
    .             In reversing the Ninth
    Circuit, the Supreme Court abandoned the factors of reliance and notice
    previously used by the Court in applying the harsh and oppressive test.
    Carlton, 
    512 U.S. at
    30–34, 
    114 S. Ct. at
    2022–24, 
    129 L. Ed. 2d at
    28–
    31. In place of the factors the Supreme Court previously applied under
    the harsh and oppressive test, the Court held, when dealing with
    economic policy, the harsh and oppressive test should not differ from the
    prohibition against arbitrary and irrational legislation.             
    Id. at 30
    , 
    114 S. Ct. at 2022
    , 
    129 L. Ed. 2d at 28
    . Thus, the Court held as long as a
    retroactive tax is supported by a legitimate legislative purpose furthered
    by rational means, the retroactive application will not violate the Federal
    Due Process Clause. 
    Id.
     at 30–31, 
    114 S. Ct. at 2022
    , 
    129 L. Ed. 2d at 28
    .
    44
    In Carlton, when deciding whether the retroactive application of a
    tax is supported by a legitimate legislative purpose furthered by rational
    means, the Supreme Court considered two factors. First, the Supreme
    Court determined whether the legislative body’s purpose in enacting the
    retroactive application of the statute was illegitimate or arbitrary. 
    Id. at 32
    , 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at 29
    . It is sufficient “if there exists
    some legitimate purpose underlying the retroactivity provision.”        
    Id. at 37
    , 
    114 S. Ct. at 2025
    , 
    129 L. Ed. 2d at 32
     (O’Connor, J., concurring).
    The Supreme Court concluded the retroactive application of the tax was
    neither illegitimate nor arbitrary. 
    Id. at 32
    , 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at 29
    . The Court determined Congress had a legitimate purpose
    in correcting a mistake it made when it enacted the Tax Reform Act of
    1986. 
    Id.
     A failure to rectify the mistake would lead to billions of dollars
    in lost revenue for the government, and innocent taxpayers would have
    to help replenish the federal coffers if the mistake was not rectified
    retroactively. 
    Id.
     at 31–32, 
    114 S. Ct. at
    2022–23, 
    129 L. Ed. 2d at 29
    .
    Second, the Supreme Court determined whether the legislature
    “acted promptly and established only a modest period of retroactivity.”
    
    Id. at 32
    , 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at 29
    . If the legislature acted
    promptly and established only a modest period of retroactivity, the
    statute would comport with due process.          
    Id.
       The Supreme Court
    determined the retroactivity of the tax in question extended for a modest
    period of slightly greater than one year. 
    Id. at 33
    , 
    114 S. Ct. at 2023
    ,
    
    129 L. Ed. 2d at 30
    .         Therefore, the Supreme Court upheld the
    retroactive application of the tax against a due process challenge. 
    Id. at 35
    , 
    114 S. Ct. at 2024
    , 
    129 L. Ed. 2d at 31
    .
    Following the Carlton decision, legal scholars agreed that, in order
    for the retroactive application of a tax to pass constitutional muster
    45
    under the Due Process Clause, a legislative body’s purpose in enacting
    the retroactive application of a tax statute can be neither illegitimate nor
    arbitrary, and the statute must possess a modest period of retroactivity.
    See, e.g., Charles H. Koch, Jr., 3 Administrative Law & Practice
    § 12.34[11] (2d ed. 1997); Pat Castellano, Retroactively Taxing Done
    Deals: Are There Limits?, 
    43 U. Kan. L. Rev. 417
    , 438 (1995); Lynn A.
    Gandhi, Taxation, 
    53 Wayne L. Rev. 599
    , 607 n.70 (2007); Robert R.
    Gunning, Back From the Dead: The Resurgence of Due Process Challenges
    to Retroactive Tax Legislation, 
    47 Duq. L. Rev. 291
    , 293–94 (2009); Leo P.
    Martinez, Of Fairness and Might: The Limits of Sovereign Power to Tax
    After Winstar, 
    28 Ariz. St. L.J. 1193
    , 1208–09 (1996); Kaiponanea T.
    Matsumura, Reaching Backward While Looking Forward: The Retroactive
    Effect of California’s Domestic Partner Rights and Responsibilities Act, 
    54 UCLA L. Rev. 185
    , 203 (2006); Michael J. Phillips, The Slow Return of
    Economic Substantive Due Process, 
    49 Syracuse L. Rev. 917
    , 964 n.306
    (1999); Monica Risam, Retroactive Reinstatement of Top Federal Estate
    Tax Rates Is Constitutional: Kane v. United States, 
    51 Tax Law. 481
    , 485
    (1998).
    Other courts have passed on the constitutionality of a retroactive
    tax statute since the Supreme Court’s decision in Carlton. These courts
    have applied the two-part Carlton test. See, e.g., Quarty v. United States,
    
    170 F.3d 961
    , 965–68 (9th Cir. 1999) (upholding a retroactive tax by
    finding an eight-month period of retroactivity to be a modest period of
    retroactivity); Kitt v. United States, 
    277 F.3d 1330
    , 1334–35 (Fed. Cir.
    2002) (upholding a retroactive tax by finding a seven-month period of
    retroactivity to be a modest period of retroactivity); Kane v. United States,
    
    942 F. Supp. 233
    , 234 (E.D. Pa. 1996) (upholding a retroactive tax by
    finding an eight-month period of retroactivity to be a modest period of
    46
    retroactivity); Enter. Leasing Co. of Phoenix v. Ariz. Dep’t of Revenue, 
    211 P.3d 1
    , 5–7 (Ariz. Ct. App. 2008) (upholding a retroactive tax by finding a
    one-month period of retroactivity to be a modest period of retroactivity);
    Gardens at W. Maui Vacation Club v. County of Maui, 
    978 P.2d 772
    , 782–
    83 (Haw. 1999) (upholding a retroactive tax by finding a six-month period
    of retroactivity to be a modest period of retroactivity); Rivers v. State, 
    490 S.E.2d 261
    , 264–65 (S.C. 1997) (holding a retroactive tax of at least two
    to three years is not a modest period of retroactivity; therefore, the
    statute’s retroactivity violates state and federal due process).
    Prior to the Supreme Court’s decision in Carlton, this court had
    two occasions to look at the retroactivity of a tax statute. The first was
    City National Bank of Clinton.     There, a taxpayer asked this court to
    determine the constitutionality of the retroactive application of a tax law
    regarding capital gains. City Nat’l Bank of Clinton, 251 Iowa at 605, 
    102 N.W.2d at 382
    . The taxpayer claimed the retroactive application of the
    statute violated the Due Process Clauses of both the United States and
    Iowa Constitutions.     Id. at 607, 
    102 N.W.2d at 383
    .             In deciding
    otherwise, this court applied a two-factor test under both Constitutions.
    
    Id.
     at 608–09, 
    102 N.W.2d at
    383–84. The first factor considered by this
    court in determining if the retroactive application of the statute violated
    due process was whether its retroactivity would be “harsh and
    oppressive.” Id. at 608, 
    102 N.W.2d at 384
    . In using this factor, this
    court applied the federal due process standard used by the Supreme
    Court at the time. See, e.g., Welch, 
    305 U.S. at 147
    , 
    59 S. Ct. at
    125–26,
    
    83 L. Ed. at 93
    .
    The second factor this court considered in City National Bank of
    Clinton, when determining if the retroactive application of the statute
    violated due process, was the period of retroactivity. City Nat’l Bank of
    47
    Clinton, 251 Iowa at 608–09, 
    102 N.W.2d at 384
    . Consideration of the
    period of retroactivity is the same as the second factor used by the
    Supreme Court in Carlton.     Carlton, 
    512 U.S. at
    32–33, 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at
    29–30. In applying this factor under the Iowa
    Constitution, this court stated the period of retroactivity should extend
    “no further than two years, or up to the adjournment of the last previous
    legislative session.” City Nat’l Bank of Clinton, 251 Iowa at 608–09, 
    102 N.W.2d at 384
    . This limitation on retroactivity prevents the legislature
    from enacting a tax that a prior legislature did not have the political will
    to enact. See 
    Iowa Code § 2.2
     (2007) (stating a regular session of the
    general assembly lasts for two years with the session beginning in the
    odd-numbered year).
    The other case decided by this court dealing with the retroactivity
    of a tax statute was Shell Oil Co.        There, a taxpayer claimed the
    retroactive application of a tax law dealing with the deductibility of a
    windfall profit tax violated the Federal Constitution’s Due Process
    Clause. Shell Oil Co., 
    417 N.W.2d at 430
    . In Shell Oil Co., this court
    reaffirmed the two-factor test it applied in City National Bank of Clinton
    and held the retroactive application of the tax did not violate due
    process. 
    Id.
     at 431–32.
    I believe the proper test to determine if a retroactive tax meets the
    due process requirements of the Federal and State Constitutions is
    whether the retroactive application of the tax statute is supported by a
    legitimate legislative purpose furthered by rational means. I also believe
    the two factors used by the Supreme Court in Carlton is the proper
    analysis to determine if the retroactive application of the statute is
    supported by a legitimate legislative purpose furthered by rational
    means.   The first factor requires the court to determine whether the
    48
    legislative body’s purpose in enacting the retroactive application of the
    statute was illegitimate or arbitrary. The second factor requires the court
    to determine whether the legislature enacted only a modest period of
    retroactivity. Labeling the tax as a tax enacted by a curative statute does
    not change this analysis.
    I agree with the majority’s analysis that the enactment of Iowa
    Code section 477A.7(5) is supported by a legitimate legislative purpose
    furthered by rational means. The majority, however, stops its analysis of
    the constitutionality of the statute at this point by labeling the tax as a
    tax authorized by a curative statute. Here, the majority and I part ways.
    In determining the constitutionality of section 477A.7(5), the court must
    also examine the period of retroactivity to determine if the tax violates
    substantive due process under the Federal and State Constitutions.
    Under a federal constitutional analysis, the modest period of
    retroactivity does not have a bright-line rule.         Justice O’Connor
    suggested in her concurring opinion that “[a] period of retroactivity longer
    than the year preceding the legislative session in which the law was
    enacted would raise, in [her] view, serious constitutional questions.”
    Carlton, 
    512 U.S. at 38
    , 
    114 S. Ct. at 2026
    , 
    129 L. Ed. 2d at 33
    (O’Connor, J., concurring). Justice Scalia, in his concurring opinion with
    Justice Thomas joining, urged abandonment of the modest-period-of-
    retroactivity factor and proposed the Court should consider the
    taxpayer’s reliance on the existing law as the second factor. 
    Id. at 40
    ,
    
    114 S. Ct. at
    2026–27, 
    129 L. Ed. 2d at 34
     (Scalia, J., concurring).
    However, the majority of the Court applied the modest-period-of-
    retroactivity factor, but did not specify a certain period of retroactivity
    that would comport with due process under the Federal Constitution. 
    Id.
    at 32–33, 
    114 S. Ct. at 2023
    , 
    129 L. Ed. 2d at
    29–30.          Rather than
    49
    specifying a specific period of retroactivity, the majority cited its prior
    decisions holding that a modest retroactivity period is “ ‘customary
    congressional practice’ ” and that a retroactive application of slightly
    greater than one year will not violate the Federal Due Process Clause. 
    Id.
    (quoting Darusmont, 
    449 U.S. at
    296–97, 101 S. Ct. at 552, 
    66 L. Ed. 2d at 517
    ).
    The Supreme Court has upheld retroactive federal tax laws against
    federal due process challenges when the period of retroactivity was less
    than fourteen months.      See 
    id.
     at 28–29, 
    114 S. Ct. at 2021
    , 
    129 L. Ed. 2d at
    26–27 (upholding a fourteen-month retroactive federal tax
    law against a due process challenge); Hemme, 
    476 U.S. at 562
    , 
    106 S. Ct. at
    2074–75, 
    90 L. Ed. 2d at
    544–45 (upholding a four-month retroactive
    federal tax law against a due process challenge); Darusmont, 
    449 U.S. at
    294–95, 101 S. Ct. at 550–51, 
    66 L. Ed. 2d at 516
     (upholding a ten-
    month retroactive federal tax law against a due process challenge);
    Hudson, 
    299 U.S. at 501
    , 57 S. Ct. at 310, 81 L. Ed. at 372 (upholding a
    one-month retroactive federal tax law against a due process challenge).
    The Supreme Court has also upheld a retroactive state tax law against a
    due process challenge that reached back two years. Welch, 
    305 U.S. at
    141–42, 
    59 S. Ct. at 123
    , 
    83 L. Ed. at 90
    . There, the Supreme Court
    emphasized that the Wisconsin legislature met biannually and passed its
    curative act “at the first opportunity after the tax year in which the
    income was received.” 
    Id.
     at 150–51, 
    59 S. Ct. at 127
    , 
    83 L. Ed. at 95
    .
    Under the Iowa Constitution, this court has developed a bright-line
    rule, consistent with Justice O’Connor’s concurring opinion in Carlton,
    for the modest period a legislature can apply a retroactive tax. In City
    National Bank of Clinton, this court applied a state due process analysis
    and held that for a retroactive tax to be valid, the period of retroactivity
    50
    should extend “no further than two years, or up to the adjournment of
    the last previous legislative session.” City Nat’l Bank of Clinton, 251 Iowa
    at 608, 
    102 N.W.2d at 384
    . I believe under an Iowa constitutional due
    process analysis, this court should continue to apply this bright-line rule
    because this limitation on retroactivity prevents the legislature from
    enacting a tax that a prior legislature did not have the political will to
    enact.
    Because this court has held the Iowa Constitution’s due process
    clause has a bright-line rule as to what constitutes a modest period of
    retroactivity, I would analyze the constitutionality of section 477A.7(5)
    under the due process clause of the Iowa Constitution.         Although the
    legislature acted promptly in enacting section 477A.7(5) after this court
    announced its decision in Kragnes, the legislature did not include a
    period of retroactivity within the bright-line rule established in City
    National Bank of Clinton.     In fact, the legislature chose to give section
    477A.7(5) an unfettered period of retroactivity.            See Iowa Code
    § 477A.7(5). This unlimited period of retroactivity far exceeds the bright-
    line rule that the period of retroactivity should extend “no further than
    two years, or up to the adjournment of the last previous legislative
    session.” City Nat’l Bank of Clinton, 251 Iowa at 608, 
    102 N.W.2d at 384
    .
    Therefore, I would hold, separately and independently from a federal due
    process analysis and in the exercise of this court’s exclusive prerogative
    to determine the constitutionality of an Iowa statute under the Iowa
    Constitution, that section 477A.7(5)’s unlimited period of retroactivity
    violates the due process clause contained in article I, section 9, of the
    Iowa Constitution.
    However, I would not end the inquiry here. In construing a statute
    the court’s ultimate goal is to ascertain and, if possible, give effect to the
    51
    intention of the legislature. Janson v. Fulton, 
    162 N.W.2d 438
    , 442 (Iowa
    1968).   Additionally, it is the court’s duty in construing a statute to
    preserve it and render it consistent with the state constitution, if
    possible. Hines v. Ill. Cent. Gulf R.R., 
    330 N.W.2d 284
    , 290 (Iowa 1983).
    It is clear that when the legislature enacted section 477A.7(5), it
    intended to retroactively authorize the collection and retention of a cable
    franchise tax, including the fees collected in excess of the municipality’s
    reasonable costs of inspecting, supervising, or otherwise regulating the
    franchise.      Accordingly,    if    I    were     to   hold   section    477A.7(5)
    unconstitutional because of its unlimited period of retroactivity, I would
    be defeating the legislature’s clear intent. Therefore, rather than holding
    the statute entirely unconstitutional, I believe the proper remedy would
    be to hold unconstitutional only that part of the retroactive period that is
    inconsistent with the due process principles contained in this dissent.
    See Peterson v. Comm’r of Revenue, 
    825 N.E.2d 1029
    , 1037–41 (Mass.
    2005) (giving a statute limited retroactivity after the court held it could
    not allow the period of retroactivity as enacted by the legislature).
    Consequently,    I   would     hold       section   477A.7(5)    can      be   applied
    retroactively, but its period of retroactivity shall not extend further than
    two years, or up to the adjournment of the last legislative session.
    The last legislative session prior to the enactment of section
    477A.7(5), ended May 3, 2006. See Iowa Sen. J., 81st G.A., Reg. Sess.,
    at 1090 (2006); Iowa H.J., 81st G.A., Reg. Sess., at 1755 (2006). Thus,
    under my analysis, the city could collect cable franchise taxes beginning
    on May 3, 2006. However, I believe any retention of cable franchise taxes
    prior to that date violates the due process clause contained in article I,
    section 9 of the Iowa Constitution.
    52
    The substantive component of the Due Process Clause “bars
    certain arbitrary, wrongful government actions ‘regardless of the fairness
    of the procedures used to implement them.’ ”     Zinermon v. Burch, 
    494 U.S. 113
    , 125, 
    110 S. Ct. 975
    , 983, 
    108 L. Ed. 2d 100
    , 113 (1990)
    (quoting Daniels v. Williams, 
    474 U.S. 327
    , 331, 
    106 S. Ct. 662
    , 665, 
    88 L. Ed. 2d 662
    , 668 (1986)).      By not applying the proper due process
    analysis, the majority permits municipalities to collect unauthorized
    taxes and legitimize them later, without temporal limitation.         The
    majority’s holding under this factual situation gives credence to Justice
    Scalia’s notion that substantive due process is an oxymoron.      Carlton,
    
    512 U.S. at 39
    , 
    114 S. Ct. at 2026
    , 
    129 L. Ed. 2d at 33
     (Scalia, J.,
    concurring).
    Hecht, J., joins this dissent.