Peter Knappe v. United States , 713 F.3d 1164 ( 2013 )


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  •                  FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    PETER KNAPPE , Executor of the           No. 10-56904
    Estate of INGBORG PATTEE ,
    deceased, and as Trustee under will         D.C. No.
    of INGBORG PATTEE , dated                2:09-cv-07328-
    07/01/1994,                                DMG-PJW
    Plaintiff-Appellant,
    v.                       OPINION
    UNITED STATES OF AMERICA ,
    Defendant-Appellee.
    Appeal from the United States District Court
    for the Central District of California
    Dolly M. Gee, District Judge, Presiding
    Argued and Submitted
    May 9, 2012—Pasadena, California
    Filed April 4, 2013
    Before: Kim McLane Wardlaw, Richard A. Paez, and
    Johnnie B. Rawlinson, Circuit Judges.
    Opinion by Judge Paez
    2                  KNAPPE V . UNITED STATES
    SUMMARY*
    Tax
    The panel affirmed the district court’s grant of summary
    judgment to the Government in a tax refund action seeking
    abatement under 26 U.S.C. § 6651(a)(1) of a penalty for
    filing a late estate tax return.
    Taxpayer claimed he was entitled to relief because he
    relied on his expert accountant, who incorrectly advised him
    about the deadline for filing the return after obtaining an
    extension. The panel held that it was taxpayer’s duty to
    ascertain the correct extended filing deadline, and that he
    failed to exercise ordinary business care and prudence by
    relying on his accountant’s advice about this nonsubstantive
    matter. Consequently, taxpayer failed to show “reasonable
    cause” under § 6651(a)(1) to excuse the penalty.
    COUNSEL
    Janet L. Everson (argued), Jason Galek, Arthur V. Pearson,
    and Vincent O’Gara, Murphy Pearson Bradley & Feeney, San
    Francisco, California, for Plaintiff-Appellant.
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    KNAPPE V . UNITED STATES                    3
    Carol Barthel (argued), John A. Dudeck, Jr., and Gilbert
    Steven Rothenberg, United States Department of Justice,
    Washington, D.C.; and Andrew Thomas Pribe, Office of the
    United States Attorney, Los Angeles, California, for
    Defendant-Appellee.
    OPINION
    PAEZ, Circuit Judge:
    When can you trust your accountant’s advice about when
    your taxes are due? That is the question we face today.
    Appellant Peter Knappe, acting as the executor of an estate,
    asked his accountant to apply for an extension of the deadline
    to file the estate-tax return from the Internal Revenue Service
    (“IRS”). The accountant told Knappe that the deadline had
    been extended one year, when in fact it had been extended
    only six months. Acting on the bad advice, Knappe filed the
    tax return several months late, and the IRS assessed
    significant penalties against the estate. Knappe initiated this
    action in the Central District of California, seeking a refund
    of the penalty. The district court granted summary judgment
    to the Government on the ground that Knappe had not shown
    “reasonable cause” to excuse the penalty, as that term is used
    in 26 U.S.C. § 6651(a)(1). We affirm.
    I. Background
    Ingeborg Pattee died on November 30, 2005, leaving
    behind a substantial estate. Her will named as the executor of
    the estate Peter Knappe, a longtime friend and successful
    businessman. Because Knappe had no prior experience
    serving as the executor of an estate or preparing an estate-tax
    4               KNAPPE V . UNITED STATES
    return, he enlisted the help of Francis Burns, a Certified
    Public Accountant. Burns had worked as a corporate tax
    accountant for Knappe’s company for many years, and
    Knappe had always been satisfied with his work. In
    December 2005, Burns told Knappe that the Pattee estate
    would need to file a United States Estate Tax Return, IRS
    Form 706. He also correctly informed Knappe that the
    deadline to file the return was nine months from the date of
    Pattee’s death: August 30, 2006.
    At some point before that deadline, Knappe realized he
    did not have time to obtain real estate appraisals that he
    needed to prepare the return accurately. Knappe sought
    Burns’s advice about requesting an extension of the filing
    deadline from the IRS. Burns told Knappe that he could
    obtain an extension of both the filing and payment deadlines,
    and that the same extension was available for both deadlines.
    Knappe authorized Burns to prepare and file IRS Form 4768,
    an “Application for Extension of Time To File a Return
    and/or Pay U.S. Estate (and Generation-Skipping Transfer)
    Taxes.”
    Form 4768 gives taxpayers three options: they can seek
    an extension of the Form 706 filing deadline, seek an
    extension of the time to pay any estate tax due, or both. The
    instructions that accompany Form 4768 explain the difference
    between the two categories of extensions. The instructions for
    “Part II, Extension of Time to File Form 706” state that an
    “executor may apply for an automatic 6-month extension of
    time to file Form 706.” An executor who is “out of the
    country” may apply for an additional extension in excess of
    the automatic six months; the instructions warn, however, that
    “[y]ou cannot combine an application for an automatic
    extension and an additional extension on the same Form
    KNAPPE V . UNITED STATES                    5
    4768.” Finally, the instructions explain that an executor who
    failed timely to apply for the automatic six-month extension
    may apply for an “extension for cause.” “Unless the executor
    is out of the country,” however, extensions for cause are
    limited to “6 months from the original due date of the Form
    706.”
    The instructions for “Part III, Extension of Time to Pay”
    explain that such an extension “may not exceed twelve
    months” and is granted at the discretion of the IRS. In
    contrast to extensions of the filing deadline, the IRS may
    grant up to ten consecutive extensions of the payment
    deadline—parceled out one year at a time—provided the
    taxpayer can establish “why it is impossible or impractical for
    the executor to pay the full amount of the estate tax by the
    estate tax return due date.”
    The two types of extensions are thus subject to two
    different sets of rules. Extensions of the filing deadline are
    granted automatically for six months, and only foreign
    executors can seek additional time. Extensions of the
    payment deadline, on the other hand, are purely discretionary,
    and the IRS may grant multiple extensions, each as long as a
    year.
    Burns filed Form 4786 on August 30, 2006, applying for
    the six-month automatic filing extension and a one-year
    discretionary payment extension.
    After filing the completed Form 4768 with the IRS, Burns
    sent a copy to Knappe. Knappe gave the form a cursory
    review, but did not examine it in detail. Knappe testified that
    there was no reason he could not have scrutinized the form,
    but that he mostly noticed the extension date Burns had
    6                KNAPPE V . UNITED STATES
    requested, “8/30/2007,” and Burns’s estimate that the taxes
    owed would total $1.1 million.
    The IRS approved the extension request in writing on
    January 11, 2007. On the form itself, which the IRS returned
    to Burns, an IRS agent had hand-written “2/28/07” next to the
    box Burns had checked to apply for the automatic six-month
    extension of the filing deadline. A new document, titled
    “Notice to Applicant,” was attached to the returned
    application. The Notice to Applicant included two sections:
    the first relating to the application for an extension of the
    filing deadline, and the second to the application for an
    extension of the payment deadline. Three checkboxes
    appeared in both sections: “Approved,” “Not approved
    because,” and “Other.” None of the boxes was checked in the
    first section. In the second section, the IRS agent had checked
    “Approved” and had typed, “TO 8/30/2007 only.”
    At the time Burns prepared Form 4768, he mistakenly
    believed that it was possible to request a twelve-month
    extension of the filing deadline, even though he had read the
    instructions and reviewed the relevant statutes and Treasury
    regulations. Before Burns filed the form, he advised Knappe
    explicitly that he could obtain a twelve-month extension of
    both the filing and payment deadlines. Knappe testified that
    he believed that the extension application would extend both
    the filing and payment deadlines for one year—to August 30,
    2007. Knappe’s understanding of the deadlines rested entirely
    on Burns’s representations; he made no independent effort to
    assay the rules. When the IRS approved the automatic six-
    month extension to the filing deadline and the discretionary
    one-year extension to the payment deadline, neither Burns
    nor Knappe realized their mistake.
    KNAPPE V . UNITED STATES                             7
    Convinced that the filing deadline had been extended one
    year, Knappe elected to wait until May 2007 to file the return,
    in part to accommodate Burns’s busy schedule during tax
    season. Burns and Knappe worked together to complete the
    return, and on May 18, 2007, Burns sent Knappe the
    completed Form 706. Burns also prepared a cover letter for
    Knappe to send to the IRS, which read, “Enclosed for filing
    is United States Estate Tax Return Form 706 for the above
    referenced decedent. The extended payment date/due date of
    this return is August 30, 2007 as shown on the IRS Form
    4768 attached to this return.” Knappe filed the return and
    cover letter on behalf of the estate on May 29, 2007. He also
    enclosed a check for the balance of the estate tax. Knappe
    later testified that he could have filed the estate-tax return by
    February 28, 2007 if he had understood that Burns had only
    obtained a six-month extension.
    Sometime in 2008, the IRS observed that Knappe had
    filed the estate-tax return after the February 28, 2007
    deadline. The agency assessed a 20 percent late-filing penalty
    for a four-month delinquency, excluding interest, in the
    amount of $196,414.60.1 Knappe called Burns to ask why the
    IRS believed the estate-tax return was late. Burns reviewed
    the regulations and quickly realized he had made an error.
    Burns admitted that determining the correct deadline “was not
    an ambiguous question.”
    1
    The IRS acknowledged in the district court that it improperly computed
    the penalty. It should have assessed a 15 percent penalty for a three-month
    delinquency, rather than the 20 percent penalty it imposed. The district
    court reduced the penalty by $49,103.65. At issue on appeal is the
    remaining $185,626.71, including interest.
    8                KNAPPE V . UNITED STATES
    Knappe requested an abatement of the penalty. The
    Internal Revenue Code excuses late-filing executors from
    penalties if the failure to file was “due to reasonable cause
    and not due to willful neglect.” 26 U.S.C. § 6651(a)(1).
    Knappe argued that he was entitled to an abatement because
    his reliance on Burns’s erroneous advice was reasonable
    cause for the late filing. The IRS denied the abatement
    request. Knappe administratively appealed the IRS’s decision,
    but the IRS denied the appeal. Knappe then paid the full
    amount due and filed a Claim for Refund with the IRS. When
    the IRS rejected the claim, Knappe brought this refund action,
    again alleging that his reliance on Burns constituted
    reasonable cause.
    The Government moved for summary judgment. The
    district court granted the motion, holding that the existence of
    reasonable cause under 26 U.S.C. § 6651(a)(1) was an issue
    of law and that Knappe’s reliance on Burns’s advice was
    insufficient to establish reasonable cause. Knappe timely
    appealed.
    We have jurisdiction under 28 U.S.C. § 1291, and “we
    review de novo both the district court’s summary judgment
    and its interpretation of the Internal Revenue Code.” Aloe
    Vera of Am., Inc. v. United States, 
    580 F.3d 867
    , 870 (9th Cir.
    2009).
    II. Analysis
    A.
    An estate-tax return, Form 706, must be filed within nine
    months of the decedent’s death. 26 U.S.C. § 6075(a);
    26 C.F.R. § 20.6075-1. An executor may apply for an
    KNAPPE V . UNITED STATES                             9
    automatic six-month extension of time to file Form 706 by
    filing Form 4768 on or before the due date of the return and
    checking the appropriate box. 26 C.F.R. § 20.6081-1(b).
    While the IRS “may grant a reasonable extension of time for
    filing any return,” “no such extension shall be for more than
    6 months” except in the case of taxpayers who are abroad.
    26 U.S.C. § 6081(a).
    Extensions of the deadline to pay the estate tax operate
    differently. Treasury Department regulations specify that the
    IRS may grant an extension of time to pay estate taxes, at the
    written request of the executor, “for a reasonable period of
    time, not to exceed 12 months.” 26 C.F.R. § 20.6161-1(a)(1).
    An executor who fails to file a timely estate-tax return is
    subject to a penalty. See 26 U.S.C. § 6651(a)(1). The late-
    filing penalty is mandatory when a taxpayer fails “to file any
    return . . . on the date prescribed therefor (determined with
    regard to any extension of time for filing), unless it is shown
    that such failure is due to reasonable cause and not due to
    willful neglect.”2 Id. The penalty amount is five percent of the
    amount of tax that appears on the return for each month or
    fraction of a month that the return is late, up to a maximum of
    25 percent. Id.
    2
    Because the language of § 6651(a)(1) is conjunctive, a late-failing
    taxpayer must show both “reasonable cause” and an absence of “willful
    neglect” to avoid paying a penalty. See United States v. Boyle, 
    469 U.S. 241
    , 245 (1985) (explaining that a taxpayer seeking to escape a penalty
    “bears the heavy burden of proving both (1) that the failure did not result
    from ‘willful neglect,’ and (2) that the failure was ‘due to reasonable
    cause’” (quoting 26 U.S.C. § 6651(a)(1))). The Government does not
    argue that Knappe’s tardiness resulted from willful neglect.
    10               KNAPPE V . UNITED STATES
    To establish reasonable cause, a taxpayer must prove that
    he “exercised ordinary business care and prudence and was
    nevertheless unable to file the return within the prescribed
    time.” 26 C.F.R. § 301.6651-1(c)(1). Knappe’s central
    argument on appeal is that by relying on his expert
    accountant’s advice about the effect of the extension on the
    deadline for filing the return, he exercised “ordinary business
    care and prudence” and so had reasonable cause for filing the
    return three months late.
    B.
    Before we turn to that cardinal issue, we must first
    address Knappe’s argument that the reasonableness of his
    actions is an issue of disputed fact that cannot be
    appropriately decided on summary judgment.
    The Supreme Court has held that “[w]hether the elements
    that constitute ‘reasonable cause’ are present in a given
    situation is a question of fact, but what elements must be
    present to constitute ‘reasonable cause’ is a question of law.”
    United States v. Boyle, 
    469 U.S. 241
    , 249 n.8 (1985). In this
    case, the parties do not seriously disagree about the material
    facts. Knappe insists that factual disputes remain regarding
    whether Knappe had knowledge of the correct filing deadline
    and whether Burns advised him about it. Viewing the
    evidence in the light most favorable to Knappe, however, we
    simply assume that he had no actual or constructive
    knowledge of the correct filing deadline and that his
    uncertainty was the product of Burns’s bad advice. What
    remains is the unambiguously legal question of whether
    Knappe’s actions satisfy the minimum elements of reasonable
    cause. See id.
    KNAPPE V . UNITED STATES                    
    11 Cow. 1
    .
    Cases addressing reasonable cause for late filing of tax
    returns fall into two general categories. In the first category
    are cases involving taxpayers who delegate the task of filing
    a return to an expert agent, only to have the agent file the
    return late or not at all. The leading case in this category is
    Boyle, 
    469 U.S. 241
    . There, Boyle, the executor of his
    mother’s estate, retained an attorney who advised him that an
    estate-tax return was due but did not mention when it was
    due. Id. Boyle contacted the attorney repeatedly to inquire
    into the progress of the estate proceedings and the preparation
    of the return, and was repeatedly assured that the return
    would be filed “in plenty of time.” Id. at 242–43 (quotation
    marks omitted). Eventually, the attorney admitted to Boyle
    that the return was late because a clerical oversight had
    caused him to overlook the deadline. Id. at 243. The return
    was filed three months late. The IRS assessed the statutory
    penalty, and Boyle sued to recover it. Id. at 244.
    The Supreme Court held that Boyle’s reliance on his
    attorney to file the tax return timely was not reasonable cause
    for the delay. “Congress has placed the burden of prompt
    filing on the executor,” the Court explained, “not on some
    agent or employee of the executor.” Id. at 249. The Court
    described the taxpayer’s “fixed and clear” duty as “an
    obligation to ascertain the statutory deadline and then to meet
    that deadline, except in a very narrow range of situations.” Id.
    at 249–50. Delegating the duty of filing to an agent was not
    within the “very narrow range of situations” in which failing
    to meet a statutory filing deadline would be excused, because
    “Congress has charged the executor with an unambiguous,
    12               KNAPPE V . UNITED STATES
    precisely defined duty to file the return within nine months.”
    Id. at 250. That the executor’s agent “was expected to attend
    to the matter does not relieve the principal of his duty to
    comply with the statute.” Id. The Court continued:
    Reliance by a lay person on a lawyer is of
    course common; but that reliance cannot
    function as a substitute for compliance with
    an unambiguous statute. . . . It requires no
    special training or effort to ascertain a
    deadline and make sure that it is met. The
    failure to make a timely filing of a tax return
    is not excused by the taxpayer’s reliance on an
    agent, and such reliance is not “reasonable
    cause” for a late filing under § 6651(a)(1).
    Id. at 251–52; see also Conklin Bros. of Santa Rosa, Inc. v.
    United States, 
    986 F.2d 315
    , 316–18 (9th Cir. 1993) (holding
    that reasonable cause did not excuse a corporation’s late
    filing and payment of taxes when the company office
    manager failed to make timely filings and payments and
    falsified records to disguise her errors from company
    management).
    In the second category are cases in which a taxpayer relies
    on an agent’s erroneous advice that no return is due. Courts
    have consistently held that such reliance does constitute
    reasonable cause for delay. Even the Boyle court appeared
    expressly to endorse such a rule:
    When an accountant or attorney advises a
    taxpayer on a matter of tax law, such as
    whether a liability exists, it is reasonable for
    the taxpayer to rely on that advice. Most
    KNAPPE V . UNITED STATES                    13
    taxpayers are not competent to discern error in
    the substantive advice of an accountant or
    attorney. To require the taxpayer to challenge
    the attorney, to seek a “second opinion,” or to
    try to monitor counsel on the provisions of the
    Code himself would nullify the very purpose
    of seeking the advice of a presumed expert in
    the first place. “Ordinary business care and
    prudence” do not demand such actions.
    496 U.S. at 250–51 (citations omitted). Cases in this category
    stand for the principle that the question of whether a return is
    due is a matter of substantive tax law, and that a taxpayer acts
    with ordinary business care and prudence when he relies on
    an expert’s answer to that question. See, e.g., United States v.
    Kroll, 
    547 F.2d 393
    , 396 (7th Cir. 1977) (holding that “when
    there is no question that a return must be filed, the taxpayer
    has a personal, nondelegable duty to file the tax return when
    due” but noting that “[w]hether or not the taxpayer is liable
    for taxes is a question of tax law which often only an expert
    can answer. The taxpayer not only can, but must, rely on the
    advice of either an accountant or a lawyer. This reliance is
    clearly an exercise of ordinary business care and prudence.”).
    This case does not fall squarely into either category.
    Knappe neither delegated the task of filing the return to a
    neglectful agent nor received mistaken advice that no taxes
    were due. Rather, he personally filed the return after the
    actual deadline, but within the time that Burns erroneously
    had assured him was available.
    In Boyle, the Supreme Court expressly declined to reach
    the question posed by this case:
    14                  KNAPPE V . UNITED STATES
    Courts have differed over whether a taxpayer
    demonstrates “reasonable cause” when, in
    reliance on the advice of his accountant or
    attorney, the taxpayer files a return after the
    actual due date but within the time the adviser
    erroneously told him was available. We need
    not and do not address ourselves to this issue.
    469 U.S. at 251 n.9 (citations omitted). Our sister circuits
    have reached contradictory conclusions. Compare, e.g.,
    Estate of Kerber v. United States, 
    717 F.2d 454
    , 455–56 (8th
    Cir. 1983) (per curiam) (refusing to find reasonable cause
    where an executrix’s attorney “correctly advised her that it
    would be necessary to file an estate tax return” but
    “erroneously believed that the return was due one year,”
    rather than nine months, “after the decedent’s death”), with
    Estate of Bradley v. Comm’r, 
    33 T.C.M. 70
    , 72–73
    (1974) (holding that it was “consistent with ordinary business
    care and prudence for [the executor] to consult a member of
    an accounting firm which regularly prepared tax returns for
    advice on the due date of the estate tax return and to rely on
    the advice he received”), aff’d, 
    511 F.2d 527
     (6th Cir. 1975).3
    3
    The Seventh and Third Circuits have taken intermediate positions in
    cases with analogous, but not identical, facts. In Fleming v. United States,
    
    648 F.2d 1122
    , 1125–27 (7th Cir. 1981), the Seventh Circuit refused to
    absolve a late-filing taxpayer whose attorney failed to submit an extension
    application after the taxpayer asked him to do so. In Sanderling, Inc. v.
    Commissioner, 
    571 F.2d 174
    , 178–79 (3d Cir. 1978), the Third Circuit
    held that a corporation’s reliance on an accountant’s misrepresentations
    about the due date of corporate income tax returns was reasonable when
    the “due date was not readily determinable” and the IRS itself was
    uncertain about the correct due date at trial.
    KNAPPE V . UNITED STATES                     15
    This case is more like the first category than the second
    because of the Supreme Court’s distinction between
    substantive and nonsubstantive tax advice, Boyle, 469 U.S. at
    251–52, which we recently recognized in Baccei v. United
    States, 
    632 F.3d 1140
    , 1148–49 (9th Cir. 2011). Reading
    those cases closely, we conclude that the question of when
    the estate-tax return was due once an extension had been
    obtained was a nonsubstantive one. For that reason, Knappe
    did not exercise ordinary business care and prudence when he
    relied unquestioningly on Burns’s advice about the extended
    deadline, and he unreasonably abdicated his duty to ascertain
    the filing deadline and comply with it.
    2.
    Given the vagaries of our famously labyrinthine tax laws,
    one might assume that hiring a tax expert is the quintessence
    of “ordinary business care and prudence.” On this view, a
    taxpayer who has solicited the services of a qualified
    professional and supplied him with the necessary information
    would be insulated from penalties stemming from the agent’s
    mistakes. After all, one hires a tax expert precisely to avoid
    having to read even the most straightforward IRS prose.
    Taxpayers, however, are not exempt from penalty liability
    for their agents’ mistakes in all cases. In Boyle, the Court
    drew a sharp distinction between substantive advice on tax
    law, on which executors may reasonably rely, and
    nonsubstantive advice, on which executors may not rely. See
    469 U.S. at 251 (“When an accountant or attorney advises a
    taxpayer on a matter of tax law, such as whether a liability
    exists, it is reasonable for the taxpayer to rely on that advice.
    Most taxpayers are not competent to discern error in the
    substantive advice of an accountant or attorney.”) (second
    16                KNAPPE V . UNITED STATES
    emphasis added). The Court also explained that determining
    the filing date of a tax return is a nonsubstantive matter:
    “[O]ne does not have to be a tax expert to know that tax
    returns have fixed filing dates and that taxes must be paid
    when they are due. . . . It requires no special training or effort
    to ascertain a deadline and make sure that it is met.” Id. at
    251–52.
    The obvious objection is that Boyle did not involve a
    request to extend the default deadline for filing the estate-tax
    return. It is a simple matter to determine when an estate-tax
    return is due—the instructions to Form 706 explain the nine-
    month deadline, under a large heading that reads, helpfully,
    “When To File.” It is harder to work through the rules
    governing extensions, which distinguish between extensions
    to the filing deadline and extensions to the payment deadline,
    as well as between domestic and foreign executors.
    Our recent decision in Baccei forecloses this objection.
    That case involved an executor, Baccei, who retained a
    certified public accountant to prepare and file a federal estate-
    tax return on behalf of the estate he was administering.
    632 F.3d at 1143. The accountant represented to Baccei that
    he had requested an extension of both the payment and filing
    deadlines, but in fact had only requested an extension of the
    filing deadline—he forgot to “check the box indicating that
    a payment extension was needed” on Form 4768. Id.
    Believing that his accountant had obtained both extensions,
    Baccei paid the taxes late and incurred a penalty. Id.
    KNAPPE V . UNITED STATES                           17
    Seeking relief from the penalty, Baccei cited cases
    involving former 26 U.S.C. § 6653(a)4 for the proposition
    first stated in Boyle that “‘[w]hen an accountant or attorney
    advises a taxpayer on a matter of tax law, such as whether a
    liability exists, it is reasonable for the taxpayer to rely on that
    advice.’” Id. at 1148 n.3 (quoting Henry v. Comm’r, 
    170 F.3d 1217
    , 1220 (9th Cir. 1999)). We distinguished Baccei’s cases
    on the grounds that they “involve[d] a taxpayer’s reliance on
    the advice of tax professionals to take aggressive tax
    deductions or adopt positions that can be classified as
    ‘reasonably debatable.’” Id. (citing Foster v. Comm’r,
    
    756 F.2d 1430
    , 1439 (9th Cir. 1985)). Baccei’s penalties
    could not be excused, we explained, because “the executor
    does not contend that [his accountant] inaccurately advised
    him of his liability under the tax code or provided him with
    substantive advice on a debatable tax position.” Id.
    Knappe attempts to distinguish Baccei on the grounds that
    Burns gave him erroneous advice about the extension he
    obtained, whereas the accountant in Baccei failed to request
    an extension at all. The distinction is without a difference.
    Both Knappe and Baccei instructed their respective agents to
    obtain extensions of the filing and payment deadlines. Both
    cases involved expert advice: both agents wrongly informed
    their principals that the filing and payment deadlines had
    been extended to a particular date. And both agents erred:
    Burns, because he misread the instructions and thought that
    the extension to the filing deadline was twice as long as was
    actually granted; and the accountant in Baccei, because he did
    4
    Section 6653 imposed penalties for underpayment of taxes “due to
    negligence or intentional disregard of rules or regulations.” See 26 U.S.C.
    § 6653(a) (1982), repealed by Pub. L. No. 101-239, Title VII, § 7721, 103
    Stat. 2106, 2399–400 (1989).
    18               KNAPPE V . UNITED STATES
    not check the appropriate box and was awarded no extension
    of the payment deadline at all. We see no reason why an
    executor whose agent misinterpreted Form 4768’s
    instructions should be entitled to a refund, but an executor
    whose agent filled out Form 4768 improperly should be
    denied one.
    It is undisputed that an executor’s reliance on expert
    advice constitutes reasonable cause in some cases. See, e.g.,
    Kroll, 547 F.2d at 396. Taken together, Boyle and Baccei
    clarify that an executor’s late filing will be excused only if he
    relied on “substantive” advice about an issue of tax law.
    Boyle, 469 U.S. at 251; Baccei, 632 F.3d at 1148 n.3. All we
    must ask, then, is whether Knappe’s reliance on Burns
    concerned a substantive tax question.
    In arguing that Burns’s advice about the extended
    deadline was substantive, Knappe relies heavily on Estate of
    La Meres v. Commissioner, 
    98 T.C. 294
     (1992). In La Meres,
    the estate’s representative understood the correct filing
    deadline for the estate-tax return, but needed additional time.
    Her lawyer advised her to apply for a six-month automatic
    extension of the filing deadline and a one-year extension of
    the payment deadline. Id. at 304–05. When the first extended
    due date for filing the estate-tax return approached, the
    representative realized she still needed more time, and again
    sought her lawyer’s advice. The lawyer advised her, wrongly,
    that a second six-month extension of the filing deadline was
    available by filing a new extension application. Id. The IRS
    denied this second request for an extension but failed to
    notify the representative, and the estate eventually incurred
    late-filing penalties. Id. at 306, 313. The La Meres court held
    that the representative had shown reasonable cause because
    she reasonably relied on her attorney’s advice that a second
    KNAPPE V . UNITED STATES                    19
    six-month extension was available, explaining that
    “[a]lthough an extension referred to in [26 U.S.C. §] 6081 is
    limited to 6 months, the statute does not explicitly state that
    the Secretary may only grant one extension.” Id. at 318,
    320–21. Thus, the court treated the question of whether
    multiple filing extensions were available as a substantive one.
    Knappe argues that his reliance was essentially identical to
    that of the representative in La Meres: like the attorney in La
    Meres, Burns also wrongly advised his client that an
    additional extension was available.
    We disagree that the issue here is substantive. At the time
    Knappe was preparing the return, the instructions to Form
    4768 were unambiguous: they stated that an “automatic 6-
    month” extension is available, but that “[a]n additional
    extension is available only if you are an executor out of the
    country” (emphasis added). On the next page, the instructions
    reiterated the point in equally unambiguous language: “An
    executor may apply for an automatic 6-month extension of
    time to file Form 706 . . . . Unless you are an executor out of
    the country (see below), the maximum extension of time to
    file is 6 months from the original due date of the applicable
    return.”
    The relevant section of the Internal Revenue Code is no
    more ambiguous: “The Secretary may grant a reasonable
    extension of time for filing any return, declaration, statement,
    or other document required by this title or by regulations.
    Except in the case of taxpayers who are abroad, no such
    extension shall be for more than 6 months.” 26 U.S.C. § 6081
    (2006). This language may be unclear about whether a
    taxpayer can request serial extensions, see La Meres, 98 T.C.
    at 320–21, but Knappe only ever requested a single extension.
    20              KNAPPE V . UNITED STATES
    We conclude that the question of when a return is
    due—even when an executor has sought an extension—is
    nonsubstantive. The deadlines here brook no debate. It was
    clear from the face of Form 4768, from the corresponding
    instructions, and from the governing statute that the
    maximum available extension of the filing deadline was six
    months. Burns himself testified that the deadline was
    “unambiguous.” See Boyle, 469 U.S. at 251 (“[R]eliance
    cannot function as a substitute for compliance with an
    unambiguous statute.”). The question of how long an
    extension was available was not a “debatable” one. Baccei,
    632 F.3d at 1148 n.3 (distinguishing cases that involved
    substantive advice on debatable tax questions); cf. Comm’r v.
    Am. Ass’n of Eng’rs Emp’t, Inc., 
    204 F.2d 19
    , 20–21 (7th Cir.
    1953) (excusing a company from a tax penalty where the
    company relied on an attorney’s substantive advice about
    whether the organization was tax-exempt). For that reason,
    Knappe cannot show reasonable cause to excuse his late
    filing.
    3.
    The line between substantive and nonsubstantive advice
    may not be perfectly bright, but it is surely more luminous
    than that between “delegation” and “reliance on advice,”
    which many courts have used to distinguish between
    reasonable and unreasonable taxpayer action. See, e.g., La
    Meres, 98 T.C. at 320. In Knappe’s case, classifying his
    actions as delegation or reliance is simply a matter of
    framing. On one view, Knappe relied on his accountant’s
    erroneous advice about a deadline. On another view,
    however, Knappe delegated his duty to obtain an extension to
    Burns, by allowing Burns to prepare the extension application
    KNAPPE V . UNITED STATES                   21
    and assuming Burns had obtained a one-year extension that
    was never available.
    Instead, we treat the distinction between substantive and
    nonsubstantive matters as coterminous with the distinction
    between an executor’s delegable and nondelegable duties. We
    have previously held that certain duties of the executor cannot
    be reasonably delegated to an agent. See Conklin Bros.,
    986 F.2d at 319 (observing that a taxpayer cannot rely on the
    negligence of an agent “to escape responsibility for the
    nonperformance of nondelegable tax duties”). Boyle touched
    on the boundaries of an executor’s nondelegable duty:
    “Congress intended to place upon the taxpayer an obligation
    to ascertain the statutory deadline and then to meet that
    deadline, except in a very narrow range of
    situations.”469 U.S. at 249–50 (emphasis added). We went
    further in Baccei, holding that the executor “was responsible
    for either identifying the payment deadline and ensuring that
    payment was made prior to that deadline, or confirming that
    a payment extension had been properly requested and
    granted.” 632 F.3d at 1149. Knappe was derelict in this duty:
    he did nothing to confirm that Burns had “properly
    requested” and obtained the one-year extension of the filing
    deadline that Burns told him the IRS had awarded. In fact,
    Burns had done neither: he improperly requested a one-year
    extension, and only obtained a six-month extension.
    We reaffirm that an executor may only reasonably rely on
    an agent’s advice about substantive tax matters. Boyle,
    469 U.S. at 250–51. Ascertaining a deadline is within the
    ambit of the executor’s nondelegable duties, because a
    deadline is a nonsubstantive matter. So too is confirming that
    a needed extension has been sought or obtained. It follows
    that ascertaining the length of any extension so obtained is
    22               KNAPPE V . UNITED STATES
    equally nondelegable, because ascertaining an extended
    deadline is no more a substantive matter than ascertaining a
    default deadline.
    As to deadlines, a responsible executor will not allow
    himself to be misled. When an attorney or accountant tells an
    executor, “This is the deadline,” the executor bears the risk
    that the advice is wrong. The rule is the same regardless of
    whether the payment deadline or the filing deadline is at
    issue, and regardless of whether the agent’s erroneous advice
    results from his misunderstanding of the relevant rules or his
    negligence in seeking the appropriate extension. Reliance on
    erroneous advice about nonsubstantive tax law issues cannot
    constitute reasonable cause for an executor’s failure to file a
    timely return. See Baccei, 632 F.3d at 1148 n.3.
    D.
    We acknowledge that the result today imposes a heavy
    burden on executors, who will affirmatively have to ensure
    that their agents’ interpretations of filing and payment
    deadlines are accurate if they want to avoid penalties. This
    burden is justified by the government’s substantial interest in
    ensuring that returns are timely filed. See Boyle, 469 U.S. at
    249.
    Moreover, any other result would reward collusion
    between culpable executors and their agents. In cases like this
    one, lawyers and accountants would be incentivized to claim
    that they gave erroneous advice to the executor whether or
    not they did in fact. The agent who fell on his sword would
    risk nothing, because the waiver of the penalty would leave
    the executor without damages. Even in cases in which
    executors and their agents did not actively collude to
    KNAPPE V . UNITED STATES                    23
    propound a contrived misrepresentation defense, negligent
    agents would be unilaterally incentivized to persist in giving
    erroneous advice to their clients, even if they realized their
    error. See Sarto v. United States, 
    563 F. Supp. 476
    , 478 (N.D.
    Cal. 1983) (“If a taxpayer who had been affirmatively misled
    by his attorney regarding the date on which his return was
    due could escape liability for a penalty while a taxpayer who
    was passively negligent could not, the ultimate result would
    be that attorneys who had engaged in active deceit would
    escape liability while attorneys who were merely guilty of
    neglect would not. . . . [T]he statute should not be enforced so
    as to encourage attorneys who are merely guilty of neglect to
    compound their error and further delay the filing of a required
    return by engaging in active deceit of their clients.”).
    E.
    It was Knappe’s duty to ascertain the correct extended
    filing deadline. By relying on his accountant’s advice about
    that nonsubstantive matter, he failed to exercise ordinary
    business care and prudence, and he cannot show reasonable
    cause to excuse the penalty. We therefore affirm the judgment
    of the district court.
    AFFIRMED.