Petaluma FX Partners, LLC v. Commissioner of IRS , 792 F.3d 72 ( 2015 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued November 18, 2014               Decided June 26, 2015
    No. 12-1364
    PETALUMA FX PARTNERS, LLC, RONALD SCOTT
    VANDERBEEK, A PARTNER OTHER THAN THE TAX MATTERS
    PARTNER,
    APPELLEE
    v.
    COMMISSIONER OF INTERNAL REVENUE SERVICE,
    APPELLANT
    On Appeal from the Order and
    Decision of the United States Tax Court
    Joan I. Oppenheimer, Attorney, U.S. Department of
    Justice, argued the cause for appellant. With her on the briefs
    were Tamara W. Ashford, Principal Deputy Assistant
    Attorney General, and Gilbert S. Rothenberg, Attorney.
    Andrew Weiner, Attorney, entered an appearance.
    Edward M. Robbins Jr. argued the cause and filed the
    brief for appellee.
    Before: HENDERSON, GRIFFITH and SRINIVASAN, Circuit
    Judges.
    Opinion for the Court filed by Circuit Judge SRINIVASAN.
    2
    SRINIVASAN, Circuit Judge: This case comes before this
    court for a third time. It arises out of the Tax Court’s
    determination that Petaluma FX Partners, LLC, was a sham
    entity and so would be disregarded for tax purposes, resulting
    in the potential imposition of penalties against individual
    partners for underreporting their taxable income. The issue
    we now consider concerns whether the Tax Court had
    jurisdiction at the current, partnership-level stage to determine
    the applicability of the penalties to the individual partners, or
    whether that determination instead must await the
    commencement of separate, partner-level proceedings against
    each partner.
    In United States v. Woods, 
    134 S. Ct. 557
    (2013), the
    Supreme Court resolved that question in favor of the
    existence of jurisdiction at this stage of the proceedings.
    Petaluma nonetheless contests the Tax Court’s jurisdiction.
    Petaluma challenges a temporary Treasury Department
    regulation that, in Petaluma’s view, is necessary to confer the
    jurisdiction recognized in Woods. We have no occasion to
    resolve Petaluma’s challenge to the temporary regulation,
    however. Assuming that a regulation in fact is necessary to
    create jurisdiction in the Tax Court, we conclude that a
    different (and permanent) regulation is the operative one for
    purposes of conferring jurisdiction. The latter regulation is
    unchallenged here, and we see no basis for questioning its
    applicability in this case. We therefore conclude that the Tax
    Court had jurisdiction to decide the applicability of penalties
    to Petaluma’s partners.
    3
    I.
    A.
    The Tax Court’s initial opinion in this case contains a
    detailed description of the facts giving rise to the dispute,
    Petaluma FX Partners, LLC v. Comm’r (Petaluma I ), 
    131 T.C. 84
    , 86-89 (2008), and our previous opinion summarizes
    the factual history, Petaluma FX Partners, LLC v. Comm’r
    (Petaluma II ), 
    591 F.3d 649
    , 650-52 (D.C. Cir. 2010). By
    way of a brief review, this case involves the so-called “Son of
    BOSS” tax shelter, in which two or more individuals set up a
    partnership solely for tax purposes. The Son of BOSS shelter
    generally makes use of a series of offsetting financial
    transactions aimed to generate artificial financial losses, with
    those losses in turn artificially reducing taxable income. In
    2000, the IRS formally identified Son of BOSS tax shelters as
    abusive transactions. I.R.S. Notice 2000-44, 2000-2 C.B.
    255.
    In August 2000, the taxpayers in this case, Ronald
    Thomas Vanderbeek and Ronald Scott Vanderbeek, created a
    Son of BOSS shelter. They formed Petaluma FX Partners,
    LLC as a partnership, ostensibly for the purpose of trading
    foreign currency options. In October 2000, the Vanderbeeks
    each contributed pairs of offsetting long and short foreign
    currency options to Petaluma. When a partner contributes
    assets to a partnership, the partner must establish her outside
    basis in that partnership, which functions as a proxy for the
    value of the assets she contributed. See 26 U.S.C. § 722.
    Each of the Vanderbeeks, upon contributing his paired
    options to Petaluma, increased his outside basis to account for
    the value of his contributed long option. But neither of the
    Vanderbeeks reduced his outside basis to account for the
    4
    offsetting assumption of liability associated with the short
    options, resulting in an artificial inflation of his basis.
    In December 2000, the Vanderbeeks terminated their
    partnership interests in Petaluma. The upshot of their tax
    avoidance scheme was to inflate their basis in the
    partnership’s assets, enabling them to claim, on their 2000
    federal income tax returns, substantial short-term capital
    losses of nearly $18 million in the case of Ronald Thomas
    Vanderbeek and nearly $8 million in the case of Ronald Scott
    Vanderbeek. The Vanderbeeks in turn used those inflated
    losses to offset their capital gains for the 2000 tax year, thus
    artificially reducing their taxable income.
    B.
    Partnerships do not pay federal income taxes. 26 U.S.C.
    § 701. A partnership’s taxable income and losses instead pass
    through to the partners, who report their shares of partnership
    income or losses on their individual federal income tax
    returns. 
    Id. When the
    IRS wishes to reject a transaction like
    the Son of BOSS tax shelter at issue in this case, it will
    disregard the partnership for tax purposes and thus disallow
    the individual partners to report the manufactured losses on
    their tax returns. See 
    Woods, 134 S. Ct. at 561-62
    . Of
    particular significance here, the IRS possesses statutory
    authority to impose additional penalties on taxpayers who
    underreport their taxable income by significant amounts. See
    26 U.S.C. § 6662.
    Although partnerships do not themselves pay income
    taxes, partnerships must submit information returns, which
    the IRS reviews and can subject to audit. See 26 U.S.C.
    § 6031. At one time, the IRS lacked any means by which to
    correct errors on a partnership’s information return in a single,
    5
    unified proceeding. Instead, if there were a mistake on a
    partnership’s information return, the IRS would need to bring
    a separate deficiency proceeding against each individual
    partner, giving rise to duplicative proceedings and the
    possibility of inconsistent treatment of partners in the same
    partnership.
    Congress addressed that problem in the Tax Equity and
    Fiscal Responsibility Act of 1982 (TEFRA), 26 U.S.C.
    §§ 6221, et seq. TEFRA establishes a two-stage process for
    review of partnership tax issues, consisting of (i) a
    partnership-level proceeding concerning the partnership as a
    whole, followed by (ii) a partner-level proceeding for each
    individual partner. With regard to the former, if the IRS
    disagrees with a partnership’s information return, it can bring
    a partnership-level proceeding in which it may adjust
    “partnership items,” 
    id. § 6221,
    defined as items “more
    appropriately determined at the partnership level,” 
    id. § 6231(a)(3).
    A partnership-level proceeding culminates in
    the IRS’s issuance of a Notice of Final Partnership
    Administrative Adjustment (FPAA), which is subject to
    judicial review in the Tax Court, the Court of Federal Claims,
    or federal district court. 
    Id. § 6226(a).
    A reviewing court has
    jurisdiction to determine “all partnership items”; the
    allocation of those items among the partners; and “the
    applicability of any penalty, addition to tax, or additional
    amount which relates to an adjustment to a partnership item.”
    
    Id. § 6226(f).
    Once the IRS’s adjustments to the partnership
    items become final, the IRS may undertake further
    proceedings at the partner level to make associated
    adjustments to the tax liability of individual partners. See 
    id. §§ 6230(a)(1)-(2),
    (c), 6231(a)(6).
    6
    C.
    In July 2005, the IRS issued an FPAA to Petaluma and its
    partners for tax year 2000. The FPAA concluded that
    Petaluma lacked economic substance and was thus a sham
    that would be disregarded for tax purposes. The FPAA
    relatedly reduced to zero the Vanderbeeks’ outside basis in
    their respective partnership interests. Finally, the FPAA
    determined that the accuracy-related penalties set forth in 26
    U.S.C. § 6662 applied to the partners’ underpayments of tax.
    Petaluma, joined by Ronald Scott Vanderbeek, timely
    filed a petition for readjustment of the FPAA in the Tax
    Court. During the initial Tax Court proceedings, Petaluma
    stipulated to the correctness of most of the adjustments made
    by the FPAA but challenged the Tax Court’s jurisdiction.
    The Tax Court granted the IRS’s motion for summary
    judgment, concluding that it had jurisdiction to determine: (i)
    that Petaluma was a sham; (ii) that the Vanderbeeks had no
    outside basis in Petaluma because “there can be no adjusted
    basis in a disregarded partnership”; and (iii) that accuracy-
    related penalties would be applicable to Petaluma’s partners.
    Petaluma I, 
    131 T.C. 97
    , 99-100, 102.
    Petaluma appealed to this court. Petaluma 
    II, 591 F.3d at 649
    . We upheld the Tax Court’s jurisdiction to deem
    Petaluma a sham entity for tax purposes. 
    Id. at 654.
    But we
    held that the Tax Court lacked jurisdiction in a partnership-
    level proceeding to determine the outside basis of individual
    partners, concluding that the determination of outside basis
    must await a subsequent partner-level proceeding. 
    Id. at 654-
    55. We therefore vacated the Tax Court’s decision that it had
    jurisdiction over the applicability of penalties, and we
    remanded for the Tax Court to decide whether it could
    7
    determine the applicability of penalties without taking into
    account the outside basis of individual partners. 
    Id. at 655-56.
    On remand, the Tax Court held that it lacked jurisdiction
    in this partnership-level proceeding to determine the
    applicability to the Vanderbeeks of accuracy-related penalties.
    Petaluma FX Partners, LLC v. Comm’r (Petaluma III ), 
    135 T.C. 581
    , 586-87 (2010). The IRS again appealed to this
    court. During the pendency of that appeal, the Tax Court in
    an unrelated case held, in seeming conflict both with our
    decision in Petaluma II and with its own decision in Petaluma
    III, that it had jurisdiction in partnership-level proceedings to
    determine both the outside basis of individual partners and the
    applicability of penalties. Tigers Eye Trading, LLC v.
    Comm’r (Tigers Eye II ), 
    138 T.C. 67
    , 143 (2012). Because of
    the apparent conflict between Petaluma III and Tigers Eye II,
    we remanded the case without reaching the merits, directing
    the Tax Court to address the extent to which its decision in
    Tigers Eye II altered its decision in Petaluma III. Petaluma
    FX Partners, LLC v. Comm’r (Petaluma IV ), No. 11-1084,
    
    2012 WL 2335993
    , at *1 (D.C. Cir. Feb. 27, 2012) (per
    curiam). On remand, the Tax Court adhered to the result in
    Petaluma III despite the apparently contradictory conclusions
    reached in Tigers Eye II. Petaluma FX Partners, LLC v.
    Comm’r (Petaluma V ), 
    103 T.C.M. 1769
    (2012).
    The IRS once again appealed, arguing that the Tax Court
    erred in finding it lacked jurisdiction to determine the
    applicability of accuracy-related penalties in Petaluma’s
    partnership-level proceeding. The taxpayer in Tigers Eye II
    concurrently appealed. We held both cases in abeyance
    pending the Supreme Court’s decision in Woods. Woods
    involved a similar tax shelter in which a partnership’s partners
    each likewise claimed large losses based on an artificially
    inflated outside basis. The Court in Woods ordered briefing
    8
    on the jurisdictional question raised by the IRS in this appeal:
    whether courts have jurisdiction in partnership-level
    proceedings to determine the applicability of accuracy-related
    penalties authorized by § 
    6662. 134 S. Ct. at 562
    .
    As a threshold matter, the Woods Court endorsed our
    holdings in Petaluma II that (i) courts have jurisdiction in
    partnership-level proceedings to determine that a partnership
    is a sham and will be disregarded for tax purposes, and (ii)
    courts lack jurisdiction in partnership-level proceedings to
    determine an individual partner’s outside basis. 
    Woods, 134 S. Ct. at 563-65
    . With respect to the latter determination, the
    Court held, in agreement with our decision in Petaluma II,
    that because outside basis is a nonpartnership item, a court in
    a partnership-level proceeding lacks jurisdiction to “make a
    formal adjustment of any partner’s outside basis.” 
    Id. at 565
    (citing Petaluma 
    II, 591 F.3d at 655
    ). The Court went on to
    hold, however, that courts in partnership-level proceedings
    have jurisdiction to determine the applicability of accuracy-
    related penalties to a partner, “even if imposing the penalty
    would also require determining . . . items such as outside
    basis.” 
    Id. at 564.
    II.
    Of the three jurisdictional questions raised by this case,
    two—jurisdiction to make a sham determination and
    jurisdiction to determine the outside basis of individual
    partners—were resolved by the Petaluma II panel, see
    Petaluma 
    II, 591 F.3d at 654-55
    , in a manner subsequently
    endorsed by the Woods Court, 
    Woods, 134 S. Ct. at 563-65
    .
    The remaining jurisdictional issue concerns whether
    jurisdiction exists in partnership-level proceedings to
    determine the applicability of penalties to the partners of a
    sham partnership, including penalties that relate to
    9
    nonpartnership items such as outside basis. See Petaluma 
    II, 591 F.3d at 655
    -56.
    In Woods, the Supreme Court resolved that question in
    favor of 
    jurisdiction. 134 S. Ct. at 564
    . The Court observed
    that the applicability-of-penalties determination is “inherently
    provisional,” in that “imposing a penalty always requires
    some determinations”—such as a partner’s outside basis—
    “that can be made only at the partner level.” 
    Id. But courts
    retain jurisdiction in partnership-level proceedings to
    determine whether any partnership-level adjustments—such
    as the determination in this case that Petaluma was a sham—
    carry “the potential to trigger a penalty” against the partners.
    
    Id. at 565
    . Under Woods, accordingly, the Tax Court in this
    case had jurisdiction to determine the applicability of
    accuracy-related penalties to the Vanderbeeks.
    Notwithstanding Woods, Petaluma contends that the Tax
    Court lacked jurisdiction in this partnership-level proceeding
    to make any determinations concerning Petaluma or its
    partners, including the determination that the partners are
    subject to accuracy-related penalties. Petaluma’s argument
    centers on the validity of a temporary regulation, § 301.6233-
    1T (the Temporary Regulation), issued in 1987 by the
    Treasury Department. Temp. Treas. Reg. § 301.6233-1T. An
    understanding of the Temporary Regulation’s potential
    implications for the Tax Court’s jurisdiction in this case
    requires a brief march through the statutory and regulatory
    provisions governing federal jurisdiction over sham
    partnerships.
    That march begins with § 6226(f) of the Internal Revenue
    Code, enacted as part of TEFRA. Section 6226(f) establishes
    that, in a partnership-level proceeding, a court (including the
    Tax Court) reviewing an FPAA has jurisdiction to determine
    10
    not only “all partnership items,” but also “the applicability of
    any penalty . . . which relates to an adjustment to a
    partnership item.” 26 U.S.C. § 6226(f). In 1984, two years
    after TEFRA’s enactment, Congress enacted § 6233(b). That
    provision states that, “to the extent provided in regulations,”
    the provisions of TEFRA are “extended” to entities that file a
    partnership return but as to which “it is [later] determined that
    there is no entity” for that taxable year (because, for instance,
    the entity is found to be a sham). 
    Id. § 6233(a)-(b).
    Treasury, acting pursuant to its authority under § 6233(b)
    to “provide[] in regulations” for the extension of TEFRA’s
    provisions to sham partnerships, 
    id. § 6233(b),
    promulgated
    the aforementioned Temporary Regulation. The Temporary
    Regulation prescribes that “any [FPAA] or judicial
    determination resulting from a [TEFRA] proceeding . . . may
    include a determination” that “there is no entity for such
    taxable year,” as well as “determinations with respect to all
    items of the entity which would be partnership items . . . if
    such entity had been a partnership in such taxable year.”
    Temp. Treas. Reg. § 301.6233-1T(a), (c)(1). Under the
    Temporary Regulation, in other words, TEFRA’s provisions
    apply not only to bona fide partnerships but also to
    partnerships determined to be shams.
    TEFRA’s provisions include § 6226(f), which, as noted,
    vests courts in partnership-level proceedings with jurisdiction
    over partnership items and over the applicability of penalties
    related to adjustments to partnership items. In Petaluma’s
    view, that provision’s grant of jurisdiction—like all of
    TEFRA’s provisions—could extend to sham partnerships only
    if a regulation promulgated under § 6233(b) so provides.
    Here, Petaluma assumes, that extension ostensibly came about
    by virtue of the Temporary Regulation. And if the Temporary
    Regulation is invalid, Petaluma argues, the Tax Court
    11
    necessarily had no valid basis upon which to assert
    jurisdiction in this partnership-level proceeding.
    Petaluma challenges the validity of the Temporary
    Regulation on the ground that its promulgation failed to
    comply with both the Administrative Procedure Act’s notice-
    and-comment requirements and the APA’s mandate that
    agencies publish a substantive rule at least thirty days before
    its effective date. See 5 U.S.C. § 553(c), (d). Although
    Petaluma failed to raise that (or any) challenge to the
    Temporary Regulation at any previous point in these
    prolonged proceedings, the IRS raises no argument that
    Petaluma forfeited its challenge. Because a forfeiture
    argument can itself be forfeited, see Deppenbrook v. Pension
    Benefit Guaranty Corp., 
    778 F.3d 166
    , 172 (D.C. Cir. 2015),
    and because the IRS has done so here, forfeiture principles
    pose no bar to reaching the merits of Petaluma’s challenge to
    the Temporary Regulation.
    While the IRS does not argue forfeiture, it contends that
    we should refrain from reaching the merits of Petaluma’s
    argument for a different reason. In the IRS’s view, law-of-
    the-case principles should bar us from addressing the validity
    of the Temporary Regulation because Petaluma II already
    resolved that question. The “law-of-the-case doctrine holds
    that decisions rendered on the first appeal should not be
    revisited on later trips to the appellate court.” LaShawn A. v.
    Barry, 
    87 F.3d 1389
    , 1393 (D.C. Cir. 1996) (en banc). Here,
    however, Petaluma II did not render a “decision” on the
    validity of the Temporary Regulation, so we would not
    “revisit” any such decision by addressing the merits of that
    issue. Although the Petaluma II panel noted the existence of
    the Temporary Regulation in discussing the Tax Court’s
    jurisdiction over the sham determination, Petaluma 
    II, 591 F.3d at 652
    , the Temporary Regulation’s validity was neither
    12
    questioned nor decided in that appeal. Even if Petaluma II in
    some sense assumed the validity of the Temporary
    Regulation, an issue “assumed” by an appellate court in an
    initial appeal does not become the law of the case; rather, the
    “law of the case doctrine does not apply where an issue was
    not raised before the prior panel and thus was not decided by
    it.” Yesudian, ex rel. U.S. v. Howard Univ., 
    270 F.3d 969
    ,
    972 (D.C. Cir. 2001). We therefore proceed to address the
    merits of Petaluma’s challenge.
    Petaluma’s challenge to the Temporary Regulation
    presumes that the Tax Court would have jurisdiction in this
    partnership-level proceeding only if a valid regulation grants
    jurisdiction over sham partnerships. Cf. Petaluma 
    II, 591 F.3d at 652
    . The IRS does not contest that premise. We
    briefly note, though, that it is unclear whether a regulation in
    fact is necessary to give the Tax Court jurisdiction to decide if
    a partnership is a sham and if penalties apply against the
    partners. The Supreme Court’s opinion in Woods concluded
    that jurisdiction exists over those matters in partnership-level
    proceedings; and in reaching that conclusion, the Court relied
    solely on TEFRA’s base jurisdictional statute, § 6226(f),
    without referencing either the statute extending TEFRA’s
    provisions to sham partnerships “to the extent provided in
    regulations,” § 6233(b), or any resulting regulation. 
    See 134 S. Ct. at 563-65
    . The Woods Court thus may have assumed
    that jurisdiction exists in the circumstances of this case by
    virtue of § 6226(f) alone, without regard to regulations
    implementing § 6233(b).
    We have no need to resolve that issue, however. Even
    assuming arguendo that the Tax Court’s jurisdiction in this
    case depends on the existence of a valid regulation issued
    under § 6233(b) extending TEFRA’s provisions to sham
    partnerships, Petaluma’s jurisdictional argument fails.
    13
    Petaluma aims at the wrong target: Petaluma challenges the
    validity of the Temporary Regulation, but the pertinent
    regulation is a later-promulgated, final regulation, Treasury
    Regulation § 301.6233-1 (2001) (the Final Regulation).
    The history of the regulations promulgated pursuant to
    § 6233 demonstrates the salience of the Final Regulation
    rather than the Temporary Regulation. In 1986, Treasury
    proposed a group of regulations implementing TEFRA,
    including one carrying out § 6233’s invitation to extend
    TEFRA’s provisions to sham partnerships by regulation.
    Prop. Treas. Reg. § 301.6233-1, 51 Fed. Reg. 13,231, 13,249-
    50 (Apr. 18, 1986). That proposed regulation stated that
    “[a]ny [FPAA] or judicial determination . . . may include a
    [sham] determination” as well as determinations of other
    “partnership” items of the entity deemed to be a sham. Prop.
    Treas. Reg. § 301.6233-1(a), (c)(1). The following year,
    Treasury issued the Temporary Regulation, which gave effect
    to the proposed regulations on an interim basis. The
    Temporary Regulation contained the same language applying
    TEFRA’s provisions to sham partnerships. Temp. Treas. Reg.
    § 301.6233-1T. And both the 1986 proposed regulation and
    the Temporary Regulation applied by their terms “with
    respect to any taxable year beginning after September 3,
    1982.” Temp. Treas. Reg. § 301.6233-1T(e); Prop. Treas.
    Reg. § 301.6233-1(e).
    The Temporary Regulation proved to be less temporary
    than perhaps initially envisioned, remaining in effect for more
    than a decade. But it was eventually displaced by the Final
    Regulation. In 1999, Treasury issued a “notice of proposed
    rulemaking by cross-reference to” the Temporary Regulation,
    conveying the department’s intent to “finalize” the Temporary
    Regulation. Modifications and Additions to the Unified
    Partnership Audit Procedures, 64 Fed. Reg. 3886, 3886-87
    14
    (Jan. 26, 1999). Treasury realized that intention in 2001 by
    promulgating the Final Regulation.         See Treas. Reg.
    § 301.6233-1.      Although the Final and Temporary
    Regulations differ in certain limited respects of no
    consequence here, compare Temp. Treas. Reg. § 301.6233-
    1T(b), (c)(2), with Treas. Reg. § 301.6233-1(b), the Final
    Regulation’s language applying TEFRA’s provisions to sham
    partnerships parrots the corresponding language of the
    Temporary Regulation, see Treas. Reg. § 301.6233-1(a), (b);
    Temp. Treas. Reg. § 301.6233-1T(a), (c)(1).
    The Final Regulation applies to all tax years, but it adopts
    a bifurcated approach depending on the tax year in question.
    First, the Final Regulation’s provisions control with regard to
    “taxable years beginning on or after October 4, 2001,” the
    date of the Final Regulation’s adoption.           Treas. Reg.
    § 301.6233-1(d). Second, for taxable “years beginning prior
    to October 4, 2001,” the Final Regulation says to “see
    § 301.6233-1T,” i.e., the Temporary Regulation. 
    Id. The rules
    set forth in the Temporary Regulation thus control for
    taxable years beginning before October 4, 2001, a period that
    includes the tax year at issue here (2000).
    While the rules set out in the Temporary Regulation
    apply to those past tax years per the direction of the Final
    Regulation, the Temporary Regulation itself does not continue
    to apply. To the contrary, the Temporary Regulation ceased
    having effect upon adoption of the Final Regulation. Indeed,
    the “Action” undertaken by the Final Regulation included
    “removal of temporary regulations,” Unified Partnership
    Audit Procedures, 66 Fed. Reg. 50,541, 50,541 (Oct. 4, 2001),
    and the Final Regulation correspondingly directed that
    “Section 301.6233-1T [the Temporary Regulation] is
    removed” from the Code of Federal Regulations. Unified
    Partnership Audit Procedures, 66 Fed. Reg. at 50,563 ¶ 53a;
    15
    compare 26 C.F.R. § 301.6233-1T (2001), with 26 C.F.R.
    § 301.6233-1 (2002). The upshot is that the Final Regulation
    controls for all tax years; but as to tax years commencing
    before October 4, 2001, the Final Regulation effectively
    incorporates the rules set forth in the no-longer-operative
    Temporary Regulation.
    Because the Final Regulation is the operative regulation,
    Petaluma’s procedural challenges to the now-obsolete
    Temporary Regulation are misdirected. Any procedural
    deficiency afflicting the Temporary Regulation is of no
    continuing significance. Rather, the Final Regulation now
    prescribes the rules applicable to all tax years, including pre-
    October 1, 2001, tax years. And because Petaluma challenges
    only the Temporary Regulation—not the Final Regulation—
    under the APA’s notice-and-comment and thirty-day-
    publication provisions, its jurisdictional argument necessarily
    fails. Nor are we aware of any basis on which Petaluma could
    assert those same procedural challenges against the Final
    Regulation.
    With regard to Petaluma’s principal challenge,
    concerning the APA’s notice-and-comment rules, see 5
    U.S.C. § 553(c), the IRS in 1999 issued a notice of proposed
    rulemaking in connection with the Final Regulation.
    Modifications and Additions to the Unified Partnership Audit
    Procedures, 64 Fed. Reg. at 3886. In that notice, the IRS
    made clear that it “intend[ed] to finalize” the Temporary
    Regulation, it observed that the “text of [the] temporary
    regulations . . . generally serves as the text of these proposed
    regulations,” and it invited the submission of comments. 
    Id. at 3886-87.
    In communicating its intention to “finalize” the
    Temporary Regulation, 
    id., the IRS
    gave notice that the rules
    set forth in the Temporary Regulation would continue to
    apply—as that regulation itself prescribed—“with respect to
    16
    any taxable year beginning after September 3, 1982.” Temp.
    Treas. Reg. § 301.6233-1T(e). The agency received no
    written comments in response to its proposed finalization of
    the Temporary Regulation. See Unified Partnership Audit
    Procedures, 66 Fed. Reg. at 50,542.
    We note, though, that the IRS evidently had previously
    received “[s]everal comments” in 1986 when it initially
    proposed a regulation applying TEFRA to sham partnerships.
    See Miscellaneous Provisions Relating to the Tax Treatment
    of Partnership Items, 52 Fed. Reg. 6779, 6780 (Mar. 5, 1987).
    When the IRS later proposed to finalize the Temporary
    Regulation in 1999, it explained that it would take into
    account those previous comments, stating that “[c]omments
    previously received in connection with the [Temporary
    Regulation] will be considered as well as new or additional
    comments.” Modifications and Additions to the Unified
    Partnership Audit Procedures, 64 Fed. Reg. at 3887. It is
    unclear from the record whether any of the previous
    comments specifically pertained to the proposed regulation
    extending TEFRA to sham partnerships or whether those
    comments instead concerned some other aspect of the broader
    set of regulations proposed at that time.
    While the IRS did not specifically discuss the prior
    comments when it adopted the Final Regulation, an agency’s
    “failure to address a particular comment or category of
    comments is not an APA violation per se.” Sherley v.
    Sebelius, 
    689 F.3d 776
    , 784 (D.C. Cir. 2012). And in any
    event, “the court will not set aside a rule” for failure to
    comply with § 553’s notice and comment requirements unless
    a party has shown that it “suffered prejudice from the
    agency’s failure.” Am. Radio Relay League, Inc. v. FCC, 
    524 F.3d 227
    , 237 (D.C. Cir. 2008) (internal quotations omitted);
    see 5 U.S.C. § 706. Here, Petaluma identifies no comment it
    17
    believes the IRS erroneously disregarded. We therefore have
    no reason to conclude that the agency failed to “base” its
    “decision . . . on a consideration of the relevant factors.”
    Thompson v. Clark, 
    741 F.2d 401
    , 409 (D.C. Cir. 1984).
    Nor could Petaluma challenge the Final Regulation on
    the ground that it infringes 5 U.S.C. § 553(d), which generally
    calls for “publication” of a “substantive rule . . . not less than
    30 days before its effective date.” The Final Regulation went
    into effect immediately upon adoption, without any 30-day
    deferral. Treas. Reg. § 301.6233-1(d). We need not address,
    however, whether there was any breach of § 553(d). As with
    the APA’s notice and comment rules, the thirty-day notice
    requirement of § 553(d) is subject “to the rule of prejudicial
    error.” 5 U.S.C. § 706; see United States v. Dean, 
    604 F.3d 1275
    , 1288 (11th Cir. 2010). There is no basis for supposing
    that Petaluma could have suffered any prejudice as a
    consequence of the agency’s decision to make the Final
    Regulation effective upon promulgation. Indeed, as the IRS
    observed at the time of the Final Regulation’s adoption,
    “[t]axpayers and the IRS ha[d] been operating under [the
    same] rules since they were promulgated as temporary
    regulations” in 1987. Unified Partnership Audit Procedures,
    66 Fed. Reg. at 50,542.
    We therefore conclude that, assuming there is a need for
    a regulation to confer jurisdiction in the Tax Court in this
    case, the Final Regulation does so. We acknowledge that the
    IRS, in its reply brief, responded to Petaluma’s challenges to
    the Temporary Regulation on the merits, without noting or
    discussing the possibility that the Final Regulation in fact is
    the operative regulation. In the course of examining the
    challenge raised by Petaluma, we have concluded, for the
    reasons explained, that the Final Regulation governs the Tax
    Court’s jurisdiction.
    18
    Finally, Petaluma raises a challenge to a separate
    regulation, Treasury Regulation § 1.6662-5(g) (1991),
    addressed to the calculation of accuracy-related penalties
    when a taxpayer’s adjusted basis is zero. Under that
    regulation, “[t]he value or adjusted basis claimed . . . is
    considered to be 400 percent or more of the correct amount.”
    
    Id. Petaluma contends
    that the regulation conflicts with the
    mathematical rule prohibiting division by zero, an argument
    noted (but not resolved) by the Supreme Court in 
    Woods. 134 S. Ct. at 566
    n.4. We, too, do not reach the merits of the
    argument.      Unlike with Petaluma’s challenge to the
    Temporary Regulation, the IRS argues that Petaluma forfeited
    its challenge to § 1.6662-5(g) by failing to raise it until this
    late stage of the case. See, e.g., Hartman v. Duffey, 
    88 F.3d 1232
    , 1236 (D.C. Cir. 1996). We agree.
    *    *    *    *   *
    For the foregoing reasons, the judgment of the Tax Court
    with respect to its jurisdiction to determine the applicability of
    penalties in partnership-level proceedings is reversed, and the
    case is remanded for further proceedings consistent with this
    opinion.
    So ordered.