Hartney Fuel Oil Company v. Board of Trustees of the Village of Forest View, etc. ( 2013 )


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  •                                
    2013 IL 115130
    IN THE
    SUPREME COURT
    OF
    THE STATE OF ILLINOIS
    (Docket Nos. 115130, 115131 cons.)
    HARTNEY FUEL OIL COMPANY et al., Appellees, v. BRIAN A.
    HAMER, Director of the Illinois Department of Revenue, et al.,
    Appellants.
    Opinion filed November 21, 2013.
    CHIEF JUSTICE GARMAN delivered the judgment of the court,
    with opinion.
    Justices Freeman, Thomas, Kilbride, Karmeier, Burke, and Theis
    concurred in the judgment and opinion.
    OPINION
    ¶1       This case concerns the proper situs for tax liability under retail
    occupation taxes arising under three Illinois statutes: the Home Rule
    County Retailers’ Occupation Tax Law, the Home Rule Municipal
    Retailers’ Occupation Tax Act, and the Regional Transportation
    Authority Act. The Illinois Department of Revenue determined
    through audit that plaintiff Hartney Fuel Oil Company’s sales at retail
    were attributable to the company’s Forest View office, rather than the
    Village of Mark location reported by the company. The change in
    location made Hartney subject to retail occupation taxes imposed by
    the Village of Forest View, Cook County, and the Regional
    Transportation Authority. The Department issued a notice of tax
    liability, which Hartney paid under protest. Hartney then filed for
    relief in the circuit court of Putnam County.
    ¶2       The circuit court of Putnam County consolidated with this case a
    declaratory judgment action by the board of commissioners of
    Putnam County and board of trustees of the Village of Mark, in which
    those local governments sought to be declared the proper situs of
    taxation. The circuit court also allowed the board of trustees of the
    Village of Forest View, the County of Cook, and the Regional
    Transportation Authority to intervene as defendants. The circuit court,
    interpreting the Department of Revenue’s regulations for the three
    taxes, found for the plaintiffs. The appellate court affirmed that
    decision. 
    2012 IL App (3d) 110144
    .
    ¶3       We granted defendants’ petitions for leave to appeal pursuant to
    Supreme Court Rule 315 (eff. Feb. 26, 2010). Pursuant to Supreme
    Court Rule 345 (eff. Sept. 20, 2010), we have permitted the
    Taxpayers’ Federation of Illinois and the Illinois Retail Merchants
    Association to file a brief amicus curiae on behalf of the plaintiffs.
    We have also permitted the Village of Schaumburg, the City of
    Chicago, the City of Peoria, the Town of Normal, and the County of
    Peoria to file a brief amicus curiae on behalf of the defendants.
    ¶4                               BACKGROUND
    ¶5        Hartney Fuel Oil Company is a retailer of fuel oil, and during all
    times relevant to this litigation its home office was in Forest View,
    Illinois. From its Forest View office, Hartney would set fuel prices,
    cultivate customer relationships, and handle administrative tasks like
    billing and accounting. Each night, Hartney staff there would
    communicate fuel prices for the following day to prospective
    customers. The Forest View home office also contained a jointly
    owned but separately incorporated transportation company, Energy
    Transport, Inc. Energy Transport served as a common carrier, filling
    many of Hartney’s fuel orders.
    ¶6        In addition to its Forest View office, Hartney had a “sales” office,
    located elsewhere in the state for tax planning purposes. The sales
    office had no direct employee of Hartney; Hartney would contract
    with a local business for a clerk to take fuel orders. Hartney
    established its first separate sales office in Elmhurst, later moving it
    to Burr Ridge, then to Peru, and then to Mark, due to prevailing local
    tax conditions. The local business would provide the services of one
    of its own employees to receive Hartney’s orders via phone; Hartney
    would pay the local business a flat rate. During the relevant time
    period, Hartney paid Putnam County Painting, a commercial painting
    business, $1,000 per month for a nonexclusive lease of 200 square
    feet and the services of a clerk.
    ¶7        Hartney had two varieties of fuel contracts, long-term
    requirements contracts and daily orders. Customers would call the
    -2-
    Mark office to place their daily orders. Any customer who called the
    Forest View office to place an order was directed to call the Mark
    office. The clerk in Mark would check a list of customers with
    approval to order on credit. Orders from those who were not credit-
    approved would be rejected. For customers who were preapproved,
    the clerk would call Energy Transport at the Forest View office, and
    Energy Transport would deliver the fuel. No confirmation of the order
    by Hartney’s Forest View office was required. Testimony at trial and
    the conclusion of the circuit court were that the clerk’s word was
    binding on Hartney.
    ¶8        Long-term requirements contracts were negotiated by Hartney’s
    president, who would instruct the customer to sign the contract and
    return it by mail to the Mark office. If Hartney’s president had not yet
    signed the contract, he would travel to the Mark office to sign it. The
    executed contracts were stored at the Mark office, with copies sent to
    the customer and Hartney’s Forest View office. These contracts were
    generally on a “keep full” basis. Energy Transport or another common
    carrier would monitor and keep full the customer’s tanks, notifying
    Hartney to invoice the long-term contract customer for any fuel
    delivered. The keep-full arrangements did not require any
    intervention by the Mark office.
    ¶9        By structuring its sales in this way, Hartney hoped to avoid
    liability for retail occupation taxes of Cook County, the Village of
    Forest View, and the Regional Transportation Authority. Such taxes
    are imposed pursuant to the Home Rule County Retailers’ Occupation
    Tax Law (55 ILCS 5/5-1006 (West 2012)), the Home Rule Municipal
    Retailers’ Occupation Tax Act (65 ILCS 5/8-11-1 (West 2012)), and
    the Regional Transportation Authority Act (70 ILCS 3615/4.03 (West
    2012)). Hartney’s interpretation of the law was that the relevant
    regulations set a bright-line test: where the purchase order is accepted
    for a sale at retail in Illinois, and the purchaser takes delivery in
    Illinois, the sale has its situs where the seller accepts the purchase
    order. This view of the situs of sale also meant that Putnam County
    and the Village of Mark received the portions of the Illinois Retailers’
    Occupation Tax funds designated for county and local government.1
    35 ILCS 120/3 (West 2012).
    1
    Neither Putnam County nor the Village of Mark imposed its own retail
    occupation taxes, and each gave Hartney a partial rebate of state retail
    occupation tax funds received, giving Hartney an even lower effective tax
    rate for sales with situs there.
    -3-
    ¶ 10       The Department of Revenue audited Hartney’s selling activity
    from January 1, 2005, to June 30, 2007, finding the proper situs of
    selling activity to be Hartney’s office in Forest View. The Department
    calculated retail occupational taxes of Cook County, Forest View, and
    the Regional Transportation Authority, and sent Hartney a notice of
    tax liability on September 5, 2008. With interest and penalties,
    Hartney owed $23,111,939.11.
    ¶ 11       Hartney paid the assessment and sued for a refund under the State
    Officers and Employees Money Disposition Act (Protest Monies Act)
    (30 ILCS 230/1 et seq. (West 2008)) in Putnam County circuit court.
    Putnam County and the Village of Mark joined Hartney in seeking
    declaratory and injunctive relief to find Mark to be the proper situs of
    sale, to release the state occupation tax money to Mark and Putnam
    County, and to release to Hartney the money it paid under protest.
    Forest View, Cook County, and the Regional Transportation
    Authority (Local Governments) intervened as defendants.
    ¶ 12       The circuit court concluded that Hartney had accepted both its
    long-term sales and daily order sales in the Village of Mark, and that
    the regulations relevant to each section established a bright-line test
    for situs of sale: where purchase orders are accepted, tax liability is
    incurred. The appellate court affirmed.
    ¶ 13                                 ANALYSIS
    ¶ 14       The issues presented by this appeal are (1) the legislative intent of
    the retail occupation tax statutes, and (2) interpretation of the
    administrative regulations implementing the retail occupation taxes.
    ¶ 15       Hartney argues, and the courts below found, that the plain
    language of the regulation establishes a bright-line test for the situs
    of retail occupation tax liability. The Department argues that such an
    interpretation is at odds with this court’s decisions on the business of
    selling under the retail occupation tax and with the legislative intent
    of the Home Rule County Retailers’ Occupation Tax Law (55 ILCS
    5/5-1006 (West 2012)), the Home Rule Municipal Retailers’
    Occupation Tax Act (65 ILCS 5/8-11-1 (West 2012)), and the
    Regional Transportation Authority Act (70 ILCS 3615/4.03 (West
    2012)).
    ¶ 16       This appeal concerns interpretation of statutes and regulations,
    both questions of law which we review de novo. People ex rel.
    Madigan v. Illinois Commerce Comm’n, 
    231 Ill. 2d 370
    , 380 (2008).
    Yet even where review is de novo, an agency’s interpretation of its
    regulations and enabling statute are “entitled to substantial weight and
    -4-
    deference,” given that “agencies make informed judgments on the
    issues based upon their experience and expertise and serve as an
    informed source for ascertaining the legislature’s intent.” Provena
    Covenant Medical Center v. Department of Revenue, 
    236 Ill. 2d 368
    ,
    387 n.9 (2010).
    ¶ 17       Factual determinations of a trial court are reviewed under the
    manifest weight of the evidence standard and will be reversed only
    where the “opposite conclusion is clearly evident or the finding is
    arbitrary, unreasonable, or not based in evidence.” Samour, Inc. v.
    Board of Election Commissioners, 
    224 Ill. 2d 530
    , 544 (2007). The
    parties disagree about the legal significance of a number of facts in
    issue but do not dispute the facts themselves.
    ¶ 18       This dispute arises under the Protest Monies Act (30 ILCS 230/1
    (West 2008)). A taxpayer willing to pay an assessment under protest
    may pay assessed taxes and file suit for a refund in circuit court,
    thereby avoiding the requirement under the Administrative Review
    Law (735 ILCS 5/3-101 et seq. (West 2008)) to exhaust all
    administrative remedies before seeking judicial review.2
    ¶ 19                  The Local Retail Occupation Tax Acts
    ¶ 20      The three statutes at issue (the local ROT Acts) allow home rule
    county and municipal governments and the Regional Transportation
    Authority (RTA) to impose a retail occupation tax “upon all persons
    engaged in the business of selling tangible personal property” at retail
    within the county, municipality, or metropolitan region. 55 ILCS 5/5-
    1006 (West 2012); 65 ILCS 5/8-11-1 (West 2012); 70 ILCS
    3615/4.03(e) (West 2012). The Village of Forest View is within Cook
    County and within the metropolitan region of the RTA. Each of the
    Local Governments has imposed its own retail occupation tax.
    ¶ 21      The local ROT Acts give information about the tax rate to be
    imposed and types of products subject to the tax, but—with the
    exception of coal and other mineral extraction—they do not offer
    substantial guidance on the proper situs of taxation. See, e.g., 55
    ILCS 5/5-1106 (West 2012). For guidance on the proper situs of retail
    2
    The appellate court noted that this court has not yet identified the
    standards to apply to a specific claim under the Protest Monies Act. 
    2012 IL App (3d) 110144
    , ¶ 32. However, the parties are in apparent agreement
    that the circuit court's standard was appropriate, and no party has briefed
    or argued the issue for this court's review. We do not define a standard at
    this time.
    -5-
    occupation tax under the local ROT Acts, one must turn to the
    regulations. The “Jurisdictional Questions” regulations for the county,
    municipality, and RTA retail occupation taxes are largely identical,
    with only minor differences in layout. See 86 Ill. Adm. Code 220.115
    (2000); 86 Ill. Adm. Code 270.115 (2000); 86 Ill. Adm. Code
    320.115 (2000). For simplicity, we refer to the Home Rule County
    Retailers’ Occupation Tax Law regulations (86 Ill. Adm. Code
    220.115 (2000)).
    ¶ 22       The circuit court and appellate court both found the regulations to
    establish a bright-line test: “If the purchase order is accepted at the
    seller’s place of business within the county, municipality and/or
    metropolitan region; ROT liability is fixed in that respective county,
    municipality and/or metropolitan region.” 
    2012 IL App (3d) 110144
    ,
    ¶ 53. The Department and Local Governments argue that the
    regulations instead present a fact-intensive inquiry, looking to the
    totality of the circumstances. They argue that only a totality-of-the-
    circumstances view accords with the legislative intent of the local
    ROT Acts and this court’s prior interpretation of the “business of
    selling” under the local ROT Acts. See, e.g., Ex-Cell-O Corp. v.
    McKibbin, 
    383 Ill. 316
    (1943).
    ¶ 23       We look first to interpretation of the statutes, beginning with plain
    language.
    ¶ 24                        Interpretation of the Statutes
    ¶ 25       When interpreting a statute, the primary objective is to give effect
    to the legislature’s intent, which is best indicated by the plain and
    ordinary language of the statute itself. Citizens Opposing Pollution v.
    ExxonMobil Coal U.S.A., 
    2012 IL 111286
    , ¶ 23. Words should be
    given their plain and obvious meaning unless the legislative act
    changes that meaning. Svithiod Singing Club v. McKibbin, 
    381 Ill. 194
    , 197 (1942). In giving meaning to the words and clauses of a
    statute, no part should be rendered superfluous. Standard Mutual
    Insurance Co. v. Lay, 
    2013 IL 114617
    , ¶ 26. Statutory provisions
    should be read in concert and harmonized. People v. Rinehart, 
    2012 IL 111719
    , ¶ 26. Where a statute is enacted after a judicial opinion is
    published, we presume the legislature acted with knowledge of the
    case law. In re Marriage of Mathis, 
    2012 IL 113496
    , ¶ 25. If further
    construction of a statute is necessary, a court may consider similar
    and related enactments. In re Shelby R., 
    2013 IL 114994
    , ¶ 39. Courts
    weighing legislative intent also consider the “object to be attained, or
    the evil to be remedied by the act.” Svithiod Singing Club, 381 Ill. at
    -6-
    198. A retail occupation tax must be given a “practical and common-
    sense construction.” Automatic Voting Machine Corp. v. Daley, 
    409 Ill. 438
    , 447 (1951).
    ¶ 26        The principal question in this appeal is determination of the
    proper situs for the “business of selling” to be taxed. To interpret a
    statute, we first look to the plain language of that statute. Neither
    party has briefed or argued the plain language of the local ROT Acts,
    aside from pointing to this court’s prior decisions on the meaning of
    the “business of selling.”
    ¶ 27        The Home Rule County Retailers’ Tax Law permits home rule
    counties to impose “a tax upon all persons engaged in the business of
    selling tangible personal property *** at retail in the county.” 55
    ILCS 5/5-1006 (West 2012). The tax is to be imposed in 1/4%
    increments, and may only be imposed at the same rate as a service
    occupation tax imposed by the county. A number of different types of
    products are exempted from home rule county taxation. Sellers are
    permitted to recover the cost of such taxes by stating the tax in a
    separate charge, along with other sales taxes. The Department of
    Revenue is charged with collection and enforcement. Apart from the
    words “at retail in the county,” the statute contains little guidance on
    how a sale is properly located for tax purposes. The only prescription
    for situs of sale in the statute governs sales of coal and other minerals:
    “For the purpose of determining the local governmental unit whose
    tax is applicable, a retail sale by a producer of coal or other mineral
    mined in Illinois is a sale at retail at the place where the coal or other
    mineral mined in Illinois is extracted from the earth.” 
    Id. The Home
           Rule Municipal Retailers’ Occupation Tax Act is identical in these
    provisions. 65 ILCS 5/8-11-1 (West 2012). Neither Act contains an
    explicit statement of legislative purpose.
    ¶ 28        The “Taxes” section of the Regional Transportation Authority Act
    allows the Board of Directors to impose a retail occupation tax upon
    “all persons engaged in the business of selling tangible personal
    property at retail in the metropolitan region.” 70 ILCS 3615/4.03(e)
    (West 2012). The “Taxes” section prescribes applicable tax rates for
    certain products in Cook County and prescribes a separate tax rate for
    Du Page, Kane, Lake, McHenry, and Will Counties. Similarly to the
    home rule county and municipal ROT Acts, the “Taxes” section of
    the RTA Act requires the Board to enact a parallel service occupation
    tax and title tax if it enacts a retail occupation tax. Sellers under the
    RTA Act are likewise permitted to recover the cost of such taxes
    from buyers by stating the tax separately. The RTA Act similarly
    -7-
    lacks any definition for situs of sale aside from sales of coal and other
    minerals. That provision is virtually identical to the one contained in
    the home rule county and municipal ROT Acts. The RTA Act does
    contain statements of legislative purpose, describing public
    transportation as an “essential public purpose.” 70 ILCS
    3615/1.02(a)(i) (West 2012).
    “There is an urgent need to reform and continue a unit of local
    government to assure the proper management of public
    transportation and to receive and distribute State or federal
    operating assistance and to raise and distribute revenues for
    local operating assistance. System generated revenues are not
    adequate for such service and a public need exists to provide
    for, aid and assist public transportation in the northeastern
    area of the State, consisting of Cook, DuPage, Kane, Lake,
    McHenry and Will Counties.” 
    Id. ¶ 29
           Thus, the plain meaning of these statutes is to allow home rule
    counties, home rule municipalities, and the Regional Transportation
    Authority to impose retail occupation taxes on persons engaged in the
    business of selling. In the context of the Regional Transportation
    Authority Act, such taxes are to be collected in part because the
    revenues generated by public transportation are insufficient to support
    that “essential public purpose” in Cook, Du Page, Kane, Lake,
    McHenry, and Will Counties. However, the plain language of the
    statutes is sparse in definition for where the “business of selling”
    takes place. This court’s prior interpretations of the “business of
    selling” in a closely related tax are instructive.
    ¶ 30        We have interpreted the plain meaning of a tax on the business of
    selling under the Retailers’ Occupation Tax Act (35 ILCS 120/1 et
    seq. (West 2012)), to be a tax on the occupation of retail selling, and
    not sales themselves. Standard Oil Co. v. Department of Finance, 
    383 Ill. 136
    , 142 (1943). Thus, the location of the business of selling
    inside or outside the state controls, and not the location of transfer of
    title. 
    Id. The business
    of selling itself is
    “the composite of many activities extending from the
    preparation for, and the obtaining of, orders for goods to the
    final consummation of the sale by the passing of title and
    payment of the purchase price. It is obvious that such
    activities are as varied as the methods which men select to
    carry on retail business and it is therefore not possible to
    prescribe by definition which of the many activities must take
    place in Illinois to constitute it an occupation conducted in
    -8-
    this State. Except for a general classification that might be
    made of the many retail occupations, it is necessary to
    determine each case according to the facts which reveal the
    method by which the business is conducted.” Ex-Cell-O
    
    Corp., 383 Ill. at 321-22
    .
    Under this “composite of many activities” view, a sales agent, limited
    to soliciting orders and unable to bind the selling company in any
    way, did not constitute a person engaged in the business of selling
    within the state. 
    Id. at 322-23.
    ¶ 31        The business of selling is distinct from the business of mere
    solicitation, as the Retailers’ Occupation Tax Act did not authorize
    a tax on mere solicitation. Allis-Chalmers Manufacturing Co. v.
    Wright, 
    383 Ill. 363
    , 366 (1943). In parsing the many activities
    making up the business of selling, some combinations of activities
    within the state are insufficient for the retail occupation tax to apply.
    Automatic Voting Machine 
    Corp., 409 Ill. at 447
    (describing
    imposition of the ROT as a question in which “each case, of
    necessity, rests completely and entirely on the foundation of its own
    facts”). For example, “promotional work, delivery of bids, transfer of
    title, delivery of machines and servicing” within the state have been
    held insufficient where bid preparation, contract execution,
    manufacturing, and accounting took place outside the state. 
    Id. at 451-52.
    In determining whether the business of selling has taken
    place in the state, courts may look through the form of a putatively
    interstate transaction to its substance, in determining whether enough
    of the business of selling took place within the state to subject it to
    the retail occupation tax. Marshall & Huschart Machinery Co. v.
    Department of Revenue, 
    18 Ill. 2d 496
    , 501 (1960).
    ¶ 32        In sum, there is a wealth of precedent that, under the Retailers’
    Occupation Tax Act, whether the taxable “business of selling” is
    being carried on requires a fact-intensive inquiry, to determine “each
    case according to the facts.” See 
    Ex-Cell-O, 383 Ill. at 321-22
    . We
    next examine whether the legislature intended the “business of
    selling” under the Home Rule County Retailers’ Occupation Tax
    Law, the Home Rule Municipal Retailer’s Occupation Tax Law, and
    the Regional Transportation Authority Act to be judged under the
    same fact-sensitive approach.
    ¶ 33        The local ROT Acts do not, by their terms, contain any explicit
    link to or distinction from the Retailers’ Occupation Tax Act.
    Nonetheless, similar and related enactments provide guidance to the
    meaning of a potentially unclear term. In re Shelby R., 2013 IL
    -9-
    114994, ¶ 39. The Retailers’ Occupation Tax Act and the local ROT
    Acts at issue use near-identical language to describe the target of
    taxation: “persons engaged in the business of selling at retail tangible
    personal property” (35 ILCS 120/2 (West 2012) (Retailers’
    Occupation Tax Act)); and “all persons engaged in the business of
    selling tangible personal property *** at retail” (55 ILCS 5/5-1006
    (West 2012) (Home Rule County Retailers’ Occupation Tax Law)).
    We conclude the General Assembly did not create this parallelism
    casually or accidentally. The 1943 Ex-Cell-O decision predates the
    local ROT Acts and made clear this court’s interpretation of “the
    business of selling at retail.” The legislature’s decision to use this
    equivalent language—and retain it through many subsequent statutory
    amendments—signals its embrace of the Ex-Cell-O “composite of
    many activities” exposition. We conclude it applies to the business of
    selling in the local ROT Acts.
    ¶ 34       Having concluded the plain language of the “business of selling”
    requires a fact-intensive inquiry under the local ROT Acts, we find
    the plain language of the statute does not fully reveal legislative intent
    as to the situs of taxation. Accordingly, we turn to other tools of
    construction. This court has previously considered the legislative
    intent of the Retailers’ Occupation Tax Act (35 ILCS 120/1 et seq.
    (West 2012)), finding the General Assembly “sought to tax the
    business of selling at retail, to arrive at some method of relieving
    property from direct taxation and to place the burden upon that class
    of business which not only enjoyed the greater part of governmental
    protection but which benefited by being conducted under that
    protection.” Svithiod Singing 
    Club, 381 Ill. at 199
    . We again stated
    the statutory intent to link retailer consumption of government
    services to retail occupation taxation under the Retailers’ Occupation
    Tax Act in Valier Coal Co. v. Department of Revenue, 
    11 Ill. 2d 402
    ,
    406-07 (1957).
    ¶ 35       Moving from the state to local level, this court applied the same
    rationale to predecessors of the municipal and county retail
    occupation taxes in Gilligan v. Korzen, 
    56 Ill. 2d 387
    , 391-92 (1974)
    (stating the General Assembly enacted prior versions of the municipal
    and county ROT Acts to account for government services provided).
    Accordingly, we again find the legislative intent of the Home Rule
    County Retailers’ Occupation Tax Law, the Home Rule Municipal
    Retailer’s Occupation Tax Act, and the retail occupation tax
    provisions of the Regional Transportation Authority Act is to allow
    local governments to impose a tax on “persons engaged in the
    -10-
    business of selling tangible personal property” at retail within their
    jurisdictions, in order to relieve some tax burden that might otherwise
    be placed on property, in favor of placing it on retailers enjoying
    governmental services. 55 ILCS 5/5-1006 (West 2012); 65 ILCS 5/8-
    11-1 (West 2012); 70 ILCS 3615/4.03(e) (West 2012).
    ¶ 36       Taking these two conclusions about the plain meaning of the
    business of selling and legislative intent together, then, the local ROT
    Acts were enacted to allow local jurisdictions to tax the composite of
    selling activities taking place within their jurisdictions, collecting
    taxes in relation to services enjoyed by the retailer. Having concluded
    the “business of selling” under the local ROT Acts is a fact-intensive
    “composite of many activities” consonant with our holding in Ex-
    Cell-O, we now consider whether the Department’s regulations are
    consistent with the statute.
    ¶ 37                       Interpretation of the Regulations
    ¶ 38        Administrative regulations have the force and effect of law and
    are interpreted with the same canons as statutes. People ex rel.
    Madigan v. Illinois Commerce Comm’n, 
    231 Ill. 2d 370
    , 380 (2008).
    Additionally, administrative agencies enjoy wide latitude in adopting
    regulations reasonably necessary to perform the agency’s statutory
    duty. Julie Q. v. Department of Children & Family Services, 
    2013 IL 113783
    , ¶ 28. Such regulations carry a presumption of validity.
    People v. Molnar, 
    222 Ill. 2d 495
    , 508 (2006). However, regulations
    may not broaden or narrow a statute’s intended scope of taxation. Ex-
    
    Cell-O, 383 Ill. at 320
    . Regulations that are inconsistent with the
    statute under which they are adopted will be held invalid. Kean v.
    Wal-Mart Stores, Inc., 
    235 Ill. 2d 351
    , 366 (2009).
    ¶ 39        The regulations governing situs of taxation for the local ROT
    Acts each appear under the heading “Jurisdictional Questions” and
    are virtually identical. See 86 Ill. Adm. Code 220.115 (home rule
    counties); 86 Ill. Adm. Code 270.115 (home rule municipalities); 86
    Ill. Adm. Code 320.115 (RTA). For simplicity, we focus on the Home
    Rule County Retailers’ Occupation Tax Law regulations (86 Ill. Adm.
    Code 220.115).
    ¶ 40        The Department argues the local ROT Act regulation defining the
    situs of tax must be read in light of the statutory intent. Read in this
    light, it argues, the regulation sets up a totality-of-the-circumstances
    inquiry. Hartney argues that the regulation is instead written to
    address numerous possible fact scenarios in an uncertain
    field—speaking with certainty in scenarios where the outcome is
    -11-
    known and providing guidance as to a likely outcome in other
    scenarios. The interpretive dispute begins in 86 Ill. Adm. Code
    220.115(b):
    “b) Mere Solicitation of Orders Not Doing Business
    1) For a seller to incur Home Rule County Retailers’
    Occupation Tax liability in a given county, the sale must
    be made in the course of the seller’s engaging in the retail
    business within that county. In other words, enough of the
    selling activity must occur within the home rule county to
    justify concluding that the seller is engaged in business
    within the home rule county with respect to that sale.
    2) For example, the Supreme Court has held the mere
    solicitation and receipt of orders within a taxing
    jurisdiction (the State), where the orders were subject to
    acceptance outside the taxing jurisdiction and title passed
    outside the jurisdiction, with the goods being shipped
    from outside the jurisdiction to the purchaser in the
    jurisdiction, did not constitute engaging in the business of
    selling within the jurisdiction. This conclusion was
    reached independently of any question of interstate
    commerce and so would apply to a home rule county as
    the taxing jurisdiction as much as to the State as the
    taxing jurisdiction.” 86 Ill. Adm. Code 220.115(b).
    ¶ 41        The Department argues that subsection (b) incorporates our
    holdings on the meaning of the “business of selling” through its
    reference to “the seller’s engaging in the retail business within that
    county.” The Department further argues that subsection (b)(1)’s
    requirement that “enough of the selling activity must occur” within
    the taxing jurisdiction invokes this court’s view of sales under retail
    occupation taxes as the composite of many activities. The appellate
    court found, and Hartney argues, that subsections (b)(1) and (b)(2)
    instead set up a threshold inquiry, analyzing whether enough of the
    sales activity takes place in the taxing jurisdiction that it might be
    made subject to the retail occupation tax there. In Hartney’s view, this
    first inquiry would narrow the field from various jurisdictions having
    some contact with the sale to those with “enough” sales activity;
    subsequent sections either define or provide guidance as to which of
    -12-
    them will enjoy tax revenues from the retailer.3 Specifically, Hartney
    argues that subsection (c)(1) conclusively establishes its tax situs at
    the location of purchase order acceptance. Subsection (c)(1) states:
    “c) Seller’s Acceptance of Order
    1) Without attempting to anticipate every kind of fact
    situation that may arise in this connection, it is the
    Department's opinion, in general, that the seller’s
    acceptance of the purchase order or other contracting
    action in the making of the sales contract is the most
    important single factor in the occupation of selling. If the
    purchase order is accepted at the seller's place of business
    within the county or by someone who is working out of
    that place of business and who does not conduct the
    business of selling elsewhere within the meaning of
    subsections (g) and (h) of this Section, or if a purchase
    order that is an acceptance of the seller’s complete and
    unconditional offer to sell is received by the seller’s place
    of business within the home rule county or by someone
    working out of that place of business, the seller incurs
    Home Rule County Retailers’ Occupation Tax liability in
    that home rule county if the sale is at retail and the
    purchaser receives the physical possession of the property
    in Illinois. The Department will assume that the seller has
    accepted the purchase order at the place of business at
    which the seller receives the purchase order from the
    purchaser in the absence of clear proof to the contrary.”
    86 Ill. Adm. Code 220.115(c)(1).
    The Department argues that Hartney’s interpretation renders
    subsection (b)(1) meaningless, as there would be no reason for a
    threshold finding of which jurisdictions may be able to tax the seller
    if another subsection conclusively establishes which jurisdiction will
    tax the seller. For the reasons stated below, we agree with the
    appellate court’s and Hartney’s view.
    ¶ 42        The Department is correct in looking to Ex-Cell-O to interpret
    subsection (b), as it references the inquiry contemplated in that case.
    In Ex-Cell-O, we said:
    3
    No party has argued, and we do not consider, any claim that the
    Department might impose the same tax in more than one location for one
    sale.
    -13-
    “An occupation, the business of which is to sell tangible
    personal property at retail, is the composite of many activities
    extending from the preparation for, and the obtaining of,
    orders for goods to the final consummation of the sale by the
    passing of title and payment of the purchase price. It is
    obvious that such activities are as varied as the methods
    which men select to carry on retail business and it is therefore
    not possible to prescribe by definition which of the many
    activities must take place in Illinois to constitute it an
    occupation conducted in this State. Except for a general
    classification that might be made of the many retail
    occupations, it is necessary to determine each case according
    to the facts which reveal the method by which the business is
    conducted.” 
    Ex-Cell-O, 383 Ill. at 321-22
    .
    We are persuaded that subsection (b)(1) makes reference to “the
    composite of many activities” in Ex-Cell-O, and subsection (b)(2)
    references that case and its progeny directly. But one key Ex-Cell-O
    concept is notably absent from the regulation: any explicit
    requirement to “determine each case according to the facts which
    reveal the method by which the business is conducted.” 
    Id. at 322.
    ¶ 43        This absence is significant because we now confront a question
    not present in Ex-Cell-O. There, the question before the court was
    whether a retailer’s activity carried on within the state was sufficient
    to constitute the business of selling under the Retailers’ Occupation
    Tax Act. 
    Id. At no
    point did the Ex-Cell-O court weigh which state
    had the majority of the business of selling incident to the sales.
    Unlike the case at bar, there were no competing claims between
    taxing jurisdictions for the enjoyment of tax funds. In short, the local
    ROT Acts present a question of allocation not present in Ex-Cell-O.
    It is true that, under subsection (b) as well as in Ex-Cell-O, enough of
    the selling activity must take place within the taxing jurisdiction to
    constitute the business of selling there. After that threshold inquiry,
    however, the Department must further determine which of the
    jurisdictions satisfying this test will be deemed the situs of taxation
    and will enjoy the tax revenues.
    ¶ 44        The Department argues that this threshold inquiry is meaningless
    if a subsequent section affirmatively defines tax situs.4 This is not so,
    4
    The Department also argues that the appellate court erroneously
    considered subsections (b)(1) and (b)(2) to make up a jurisdictional
    -14-
    for reasons we outline in discussing subsection (c). Subsection (b),
    standing alone, does not establish a fact-intensive test for the question
    of tax situs. For the regulation to mandate a fact-intensive test, such
    test must originate in a subsequent subsection or be clear from
    subsections read together.
    ¶ 45       Subsection (c), however, does much to undermine the
    Department’s view that the regulation embodies a totality-of-the-
    circumstances inquiry. It begins:
    “c) Seller’s Acceptance of Order
    1) Without attempting to anticipate every kind of fact
    situation that may arise in this connection, it is the
    Department’s opinion, in general, that the seller’s
    acceptance of the purchase order or other contracting
    action in the making of the sales contract is the most
    important single factor in the occupation of selling. If the
    purchase order is accepted at the seller’s place of business
    within the county or by someone who is working out of
    that place of business and who does not conduct the
    business of selling elsewhere within the meaning of
    subsections (g) and (h) of this Section, or if a purchase
    order that is an acceptance of the seller’s complete and
    unconditional offer to sell is received by the seller’s place
    of business within the home rule county or by someone
    working out of that place of business, the seller incurs
    Home Rule County Retailers’ Occupation Tax liability in
    that home rule county if the sale is at retail and the
    purchaser receives the physical possession of the property
    in Illinois. The Department will assume that the seller has
    accepted the purchase order at the place of business at
    which the seller receives the purchase order from the
    purchaser in the absence of clear proof to the contrary.”
    86 Ill. Adm. Code 220.115(c)(1).
    Subsection (c)(1) has three sentences, and the meaning of each of
    these sentences must be considered in light of the others. The first
    sentence states the Department’s opinion that the seller’s acceptance
    of purchase order is the “most important single factor in the
    provision. In fact, the appellate court said this inquiry was “analogous” to
    minimum contacts in personal jurisdiction. 
    2012 IL App (3d) 110144
    ,
    ¶¶ 43-44.
    -15-
    occupation of selling.” For the purpose of discussion, we refer to this
    as the “opinion” sentence. The next sentence outlines four
    occurrences of purchase order acceptance and two conditions, under
    which the seller incurs tax liability. For the purpose of discussion, we
    refer to this as the “seller incurs” sentence. Subsection (c)(1)
    concludes with a presumption about the location of purchase order
    acceptance.
    ¶ 46        The “opinion” sentence, standing alone, could be viewed to
    contemplate a totality-of-the-circumstances test. “Without attempting
    to anticipate every kind of fact situation that may arise in this
    connection, it is the Department’s opinion, in general, that the seller’s
    acceptance of the purchase order or other contracting action in the
    making of the sales contract is the most important single factor in the
    occupation of selling.” 
    Id. The phrase
    “[w]ithout attempting to
    anticipate every kind of fact situation that may arise” suggests a
    nuanced inquiry. “[I]t is the Department’s opinion, in general,”
    additionally suggests that other facts may control. These two phrases
    significantly temper the impact of “the seller’s acceptance of the
    purchase order or other contracting action in the making of the sales
    contract is the most important single factor in the occupation of
    selling.” That purchase order acceptance is the “most important single
    factor” (emphasis added) likewise implies that other factors might be
    considered. Once more, however, the regulation has used language
    that might suggest a totality-of-the-circumstances test, but stops short
    of establishing one.
    ¶ 47        On its own, the “opinion” sentence communicates less than it
    initially appears. First, it communicates that the Department does not
    try to anticipate every fact scenario that might arise in determining
    situs of retail occupation taxes, suggesting there may be difficulty in
    writing a rule that fits every situation. Next, the seller’s acceptance of
    the purchase order is, in general, the most important single factor to
    locating the business of selling. This sentence might help to establish
    a totality-of-the-circumstances test, depending on what follows.
    ¶ 48        But, as counsel for Hartney argues, what follows is not a list of
    factors that are considered important, or even guidance as to when the
    acceptance of purchase order might be overcome by other facts.
    Instead, subsection (c)(1) continues with the certain and definitive
    “seller incurs” sentence:
    “If the purchase order is accepted at the seller’s place of
    business within the county or by someone who is working out
    of that place of business and who does not conduct the
    -16-
    business of selling elsewhere within the meaning of
    subsections (g) and (h) of this Section, or if a purchase order
    that is an acceptance of the seller’s complete and
    unconditional offer to sell is received by the seller’s place of
    business within the home rule county or by someone working
    out of that place of business, the seller incurs Home Rule
    County Retailers’ Occupation Tax liability in that home rule
    county if the sale is at retail and the purchaser receives the
    physical possession of the property in Illinois.” (Emphasis
    added.) 
    Id. ¶ 49
           This sentence begins by stating four mutually exclusive scenarios
    for the receipt of a purchase order within the jurisdiction: (1)
    acceptance of a purchase order at the seller’s place of business in the
    county; or (2) acceptance of same by someone working out of that
    place of business who is not placed elsewhere by the rules for coal or
    selling from a truck; or (3) receipt at the seller’s in-county place of
    business of a purchase order that is itself acceptance of the seller’s
    complete, unconditional offer to sell; or (4) receipt of same by
    someone working out of that place of business. The “seller incurs”
    sentence concludes with two conditions: (1) sale is at retail, and
    (2) the purchaser receives physical possession within the state. When
    one of the purchase order scenarios occurs and the two conditions are
    met, “the seller incurs Home Rule County Retailers’ Occupation Tax
    liability in that home rule county.” 
    Id. The “seller
    incurs” sentence
    contains none of the nuance or hedging present in the “opinion”
    sentence. It states that when one of these scenarios occurs, and two
    conditions are satisfied, “seller incurs *** liability in that home rule
    county.” 
    Id. ¶ 50
           Regulatory provisions, like statutory provisions, must be read in
    concert and harmonized. See People v. Rinehart, 
    2012 IL 111719
    ,
    ¶ 26. The “opinion” sentence does not diminish the certainty of the
    “seller incurs” sentence. Rather, taking the two together renders a
    meaning that, although it is difficult to craft a rule that properly
    defines the situs of every sales arrangement, the place of purchase
    order acceptance is so important that it will conclusively govern when
    these conditions are met.
    ¶ 51        The final sentence, establishing a presumption as to where “the
    seller has accepted the purchase order,” does not provide support for
    the Department’s view that this regulation, in its entirety, creates a
    totality-of-the-circumstances approach. First, the final sentence does
    not establish a presumption on tax situs; it establishes a presumption
    -17-
    to determine where the purchase order was accepted. Second, because
    it creates a presumption as to the location of purchase order
    acceptance, it only bolsters the interpretation that subsection (c)(1) is
    establishing purchase order as the controlling test where the two
    conditions are met. Third, it makes clear that the “seller incurs”
    sentence is not simply a presumption under any totality-of-the-
    circumstances test contemplated by the “opinion” sentence. In
    drafting the regulation, the Department knew how to write a
    presumption, and this presumption as to the location of purchase
    order acceptance is the only one present in subsection (c)(1).
    ¶ 52       The following subsection, (c)(2), accords with the view that
    subsection (c)(1) conclusively establishes purchase order acceptance
    as the sole factor under certain circumstances, as it conclusively sets
    tax situs for certain situations when the purchase order is accepted
    outside the state. Subsection (c) thus contains not one but two
    definitive situs-setting provisions.
    “(2) If a purchase order is accepted outside this State, but
    the tangible personal property that is sold is in an inventory of
    the retailer located within a county at the time of its sale (or
    is subsequently produced in the county), then delivered in
    Illinois to the purchaser, the place where the property is
    located at the time of the sale (or subsequent production in the
    county) will determine where the seller is engaged in business
    for Home Rule County Retailers’ Occupation Tax purposes
    with respect to that sale.” 86 Ill. Adm. Code 220.115(c)(2).
    Like the “seller incurs” sentence in subsection (c)(1), this sentence
    starts with a scenario: the purchase order being accepted outside the
    state. It continues by listing two conditions for imposition of the retail
    occupation tax: (1) that the personal property be in the inventory of
    the retailer within the county; and (2) that the personal property be
    delivered in Illinois to the purchaser. Where this scenario occurs
    under these two conditions, “where the property is located at the time
    of the sale *** will determine where the seller is engaged in business”
    for purposes of the retail occupation tax. 
    Id. ¶ 53
          This subsection also makes clear why subsection (b)(1) must
    frame a threshold inquiry as to whether enough sales activity is taking
    place within the jurisdiction to constitute the business of selling under
    the local ROT Acts. The Department argues that interpreting
    subsection (b)(1) as a threshold inquiry effectively strips that
    subsection of meaning, as there would be no reason to determine
    which jurisdictions may potentially subject the taxpayer to liability,
    -18-
    “when the place where the purchase order is accepted will
    conclusively determine where the taxpayer must pay.” Subsection
    (c)(2), by imposing liability even where a purchase order is accepted
    outside the state, makes clear that the purchase order does not
    “conclusively determine where the taxpayer must pay” under every
    provision of the regulation.5 The regulation contemplates that certain
    sales activities will take place outside the state, and others will take
    place within the state, but there might still be enough activity within
    the county to constitute the “business of selling” there. Subsection
    (c)(2) describes one arrangement that will bring about tax liability
    within the county by carrying on the business of selling there. If
    subsection (b)(1) instead framed an overall totality-of-the-
    circumstances test, subsection (c)(2) would not be written as an
    affirmative situs-setting rule, but rather as a simple example of one
    cross-border situation that would still qualify for retail occupation tax
    liability within the county. Instead, the regulation reads much as the
    appellate court interpreted it: subsection (b)(1) establishes a threshold
    inquiry into whether enough sales activity takes place in the local
    jurisdiction; subsections like (c)(1) and (c)(2) then settle the question
    of allocation among jurisdictions within the state.
    ¶ 54       Returning to our conclusion that subsections (c)(1) and (c)(2)
    contain two statements affirmatively setting a location for tax situs,
    reading the remainder of the regulation supports this view. Three
    additional provisions define “the seller’s place of business” or “where
    the seller is engaged in business” (86 Ill. Adm. Code 220.115(c)(1)-
    (2)) and one defines “the local governmental unit whose tax is
    applicable” (86 Ill. Adm. Code 220.115(h); 86 Ill. Adm. Code
    220.115(e) (long-term and blanket contracts); 86 Ill. Adm. Code
    220.115(f) (sales through vending machines); 86 Ill. Adm. Code
    220.115(g) (sales from a truck as portable place of business); 86 Ill.
    Adm. Code 220.115(h) (sales of coal and other minerals)). Each
    speaks definitively to the object of the inquiry: where is the business
    of selling being carried on, such that tax is imposed? None is stated
    as a presumption. None is stated as an example of a likely allocation
    under a totality-of-the-circumstances test. The regulation thus
    contains six provisions that affirmatively set the situs of taxation
    5
    Additionally, subsections (f), (g), and (h) govern situations in which
    a purchase order may not be involved at all. Subsection (c)(1)’s limited
    statement that the place of purchase order controls under these limited
    circumstances does not obviate the need for the (b)(1) threshold inquiry.
    -19-
    under different scenarios, so long as conditions are met. In sum, the
    overall structure of the regulation militates against the Department’s
    claim of an overall totality-of-the-circumstances test.
    ¶ 55       In interpreting the regulation, we turn finally to the Department’s
    argument that because subsection (d) lists other factors like the
    location of delivery and location where title passes, those “may play
    a role in determining where a retailer is located.” The Department
    argues that the presence of these factors supports its argument that the
    regulation crafts a totality-of-the-circumstances test, or there would
    be no occasion to consider these factors at all. We note, first, that
    these factors are described in the regulation as being “not necessary”
    and “not a decisive consideration.” 86 Ill. Adm. Code 220.115(d)(1)-
    (2). Indeed, none of the factors listed in subsection (d) are deemed
    important in the regulation; the subsection is titled “Some
    Considerations That Are Not Controlling.” 
    Id. It is
    plausible this
    subsection means to rule out certain types of challenges to liability by
    taxpayers. It is plausible this subsection means to present factors to
    deciding situations that fit none of the fact scenarios definitively
    addressed in subsections (c)(1)-(2), (e), (f), (g), and (h), but which do
    meet the threshold requirements of subsection (b) so that tax liability
    may still be incurred. Having concluded that this subsection does not
    support the Department’s view, we need not and do not decide that
    question.
    ¶ 56       Even granting the Department considerable deference in
    interpreting its regulations, we cannot find that its reading of the
    regulation is correct. We conclude that the regulation, in subsection
    (c)(1), does define situs for retail occupation tax where purchase
    order acceptance occurs at the seller’s place of business within the
    county, with sale at retail and the purchaser taking delivery within the
    state. We now turn to whether the regulation constitutes a valid
    implementation of the statutes.
    ¶ 57               Reconciling the Regulation with the Statute
    ¶ 58       As noted previously, the legislative intent of the local ROT Acts
    is to permit home rule municipalities and counties, along with the
    RTA, to enact retail occupation taxes in order to place some of the
    burden of paying for local government services on the retailers who
    enjoy them. See Svithiod Singing 
    Club, 381 Ill. at 199
    . The retail
    occupation tax is laid upon the business of selling and not upon sales
    themselves. Standard Oil 
    Co., 383 Ill. at 142
    . Under our precedent,
    the business of selling is a composite of many activities. Ex-Cell-O
    -20-
    
    Corp., 383 Ill. at 321-22
    . Determining that enough of the business of
    selling is taking place in a given jurisdiction requires a fact-intensive
    inquiry. 
    Id. ¶ 59
           Administrative agencies have deference in enacting regulations,
    and regulations are presumed valid. Julie Q. v. Department of
    Children & Family Services, 
    2013 IL 113783
    , ¶ 28; People v. Molnar,
    
    222 Ill. 2d 495
    , 508 (2006). Administrative agencies likewise are
    entitled to deference in interpreting the statutes they enforce. Provena
    Covenant Medical Center v. Department of Revenue, 
    236 Ill. 2d 368
    ,
    387 n.9 (2010). Agencies’ broad latitude in enacting regulations to
    enforce their statutes may include presumptions or other shortcuts in
    administrative decision making. We do not strike regulations down
    simply because they are unwise or bad policy. Oak Liquors, Inc. v.
    Zagel, 
    90 Ill. App. 3d 379
    (1980). Thus, our review is not whether the
    regulation is the best possible implementation, but rather whether it
    is a permissible interpretation of the statute.
    ¶ 60        As noted above, the question of determining tax situs for a tax on
    the business of selling presents a complicated inquiry. One line of
    reasoning would persuade us to find the regulation constitutes a
    reasonable compromise between the administrative difficulty of
    determining appropriate tax situs in every situation and the need for
    accurate tax assessment. A regulation might call for a “shortcut” in
    decisionmaking without effecting a prohibited expansion or
    contraction of the taxing statute it implements.
    ¶ 61        On the other hand, a regulation cannot narrow or broaden the
    scope of intended taxation under a taxing statute. Kean v. Wal-Mart
    Stores, Inc., 
    235 Ill. 2d 351
    , 372 (2009). A regulation that does so
    must be held invalid. 
    Id. We are
    persuaded that this regulation
    impermissibly narrows the local ROT Acts, contrary to the
    legislature’s intention to allow local governments to collect taxes
    from retailers in their jurisdictions. First, it does not amply prescribe
    the fact-intensive inquiry contemplated by this court in Ex-Cell-O.
    Second, by allowing for only one, potentially minor step in the
    business of selling to conclusively govern tax situs, this regulation
    impermissibly constricts the scope of intended taxation.
    ¶ 62        In the case at hand, Hartney conducted the bulk of its selling
    activity in Forest View. It carried out all of its marketing efforts,
    maintained inventory, set prices, and cultivated sales relationships
    there. Hartney began routing its purchase orders through a separate
    sales office exclusively for the purpose of tax planning. While the
    clerk in Mark could bind Hartney, the clerk participated in no other
    -21-
    aspect of the business of selling. This shift from Forest View to Mark
    removed Hartney from the retail occupation tax rolls of Forest View,
    Cook County, and the RTA. This effected more than a shift in tax
    allocation; it effected a full removal from tax liability. It did not,
    however, remove Hartney from the enjoyment of services offered by
    the Local Governments.
    ¶ 63       Amici Taxpayer’s Federation of Illinois and Illinois Retail
    Merchants Association argue that certainty is a high priority for
    retailers, pointing to numerous states employing bright-line tests in
    determining tax situs. These are arguments well suited for the General
    Assembly. Should the legislature decide that tax certainty warrants a
    single-factor determination of retail occupation tax situs, it can draft
    such a test. However, by consistently employing the “business of
    selling” language that we have interpreted to require a fact-intensive
    inquiry to find the proper situs of a composite of many activities, the
    legislature has effectively invoked this court’s precedent on the
    Retailers’ Occupation Tax Law. It is not incumbent upon this court
    to decide the best tax policy; the court is to decide the tax policy the
    legislature has chosen and communicated through the statute.
    ¶ 64       The “Jurisdictional Questions” regulations embodied in 86 Ill.
    Adm. Code 220.115, 270.115, and 320.115 are too inconsistent with
    the statutes and case law to stand, and they are held invalid.
    ¶ 65                                   Abatement
    ¶ 66       Regulations carry the force and effect of law. People ex rel.
    Madigan v. Illinois Commerce Comm’n, 
    231 Ill. 2d 370
    , 380 (2008).
    However, an agency’s powers are limited to those granted by statute,
    and acts of an agency beyond its statutory powers are void. Julie Q.
    v. Department of Children & Family Services, 
    2013 IL 113783
    , ¶ 24.
    Likewise, “where the public revenues are involved, public policy
    ordinarily forbids the application of estoppel to the State.” Austin
    Liquor Mart, Inc. v. Department of Revenue, 
    51 Ill. 2d 1
    , 4 (1972).
    Were these the only governing principles, the Department might still
    collect the tax despite its invalid regulation. In the absence of the void
    regulation, Hartney would be taxed under the general principles of the
    statute, left only with its argument for estoppel by erroneous
    information letters and other publications of the Department.
    ¶ 67       Yet the legislature has provided for a taxing agency to become
    bound to its own flawed interpretation of the law in effect at that
    time. See, e.g., McLean v. Department of Revenue, 
    184 Ill. 2d 341
    ,
    363 (1998) (holding that an erroneous interpretive release precluded
    -22-
    the Department from levying tax during that time period). The
    Taxpayers’ Bill of Rights Act imposes upon the Department a duty to
    “abate taxes and penalties assessed based upon erroneous written
    information or advice given by the Department.” 20 ILCS 2520/4(c)
    (West 2008). The Department’s own written regulations provide
    guidance to taxpayers as to their liability. While we do not find
    Hartney’s approach to retail occupation tax liability consistent with
    the statute or this court’s precedent, the company did act consistently
    with the Department’s regulation published at the time.6 It has been
    six years since the most recent of these sales were completed.
    Hartney’s ability to recover such amounts from its customers, or to
    plan for such tax liabilities in advance, has long since passed.
    ¶ 68       We do not disturb the findings by the trial and appellate courts
    that, under the regulations, Hartney accepted its purchase orders and
    long-term contracts in Mark. Because of the Department’s erroneous
    regulations, the Department has a duty under the Taxpayers’ Bill of
    Rights Act to abate Hartney’s penalties and retail occupation tax
    liability of Forest View, Cook County, and the Regional
    Transportation Authority for the audit period.
    ¶ 69       For the reasons stated, the judgment of the appellate court is
    affirmed in part and reversed in part.
    ¶ 70       Appellate court judgment affirmed in part and reversed in part.
    6
    The Local Governments have additionally argued that Hartney’s
    arrangement should be disregarded as a sham transaction. Analyzing a
    sham transaction requires assessment of the multiple steps of a transaction,
    with each being considered relevant, to determine whether economic reality
    accords with the formal arrangement. Commissioner v. Court Holding Co.,
    
    324 U.S. 331
    , 334 (1945). Because we conclude the regulation erroneously
    sited tax based solely on purchase order acceptance in the case at bar, the
    sham transaction doctrine is unavailing. Hartney structured its affairs in
    accordance with the regulation, by relocating its order-receiving function
    to a lower tax jurisdiction. Hartney’s arrangement was not without
    economic substance or economic effect. “The legal right of a taxpayer to
    decrease the amount of what otherwise would be his taxes, or altogether
    avoid them, by means which the law permits, cannot be doubted.” Gregory
    v. Helvering, 
    293 U.S. 465
    , 469 (1935).
    -23-