Groves v. Commissioner: IRS Penalty Assessment Stands Despite Procedural Omission

The $4.35 Million Penalty: A Tax Shelter Dispute with Broad Implications

The Tax Court just handed the IRS a procedural victory in a dispute that could have cost a taxpayer $4.35 million in penalties—while simultaneously asserting its authority to police the agency’s compliance with statutory notice requirements. In Philips G. Groves v. Commissioner, T.C. Memo. 2026-86 (filed Sept. 16, 2026), the court denied the petitioner’s motion for summary judgment, ruling that the IRS’s failure to include a penalty computation with the Penalty Notice under Section 6751(a)—which requires the IRS to provide a “written notice” containing a “detailed computation” of any proposed penalty—was a non-prejudicial procedural error. The court’s holding underscores its willingness to scrutinize IRS procedural compliance while declining to invalidate the penalty despite the omission, a stance that reinforces judicial oversight over administrative enforcement actions. The decision arrives at a moment when the IRS is aggressively targeting distressed asset debt transactions (DADTs) as reportable tax shelters under Section 6111, making the court’s interpretation of Section 6751(a) particularly consequential for taxpayers and advisors navigating penalty assessments.

The Facts: A Decade-Long Battle Over Distressed Asset Debt Transactions

The dispute traces its origins to a September 24, 2013, Notice of Proposed Adjustment (NOPA) issued by the IRS to the petitioner, then represented by attorney Thomas Cullinan. In that NOPA, the IRS asserted that the petitioner had acted as a material advisor under Section 6111 by participating in the organization and sale of so-called distressed asset debt transactions (DADTs). The IRS further alleged that the petitioner had failed to register these transactions as tax shelters under Section 6111, and as a consequence, was liable for penalties under Section 6707, which imposes a penalty for failure to furnish tax shelter information. The NOPA proposed a penalty for taxable year 2001 of $5,831,197, calculated as one percent of $583,119,708, the aggregate amount invested in connection with the transactions. The IRS included Form 886-A, Explanation of Items, and related exhibits, which contained a spreadsheet showing the penalty computation in detail.

The distressed asset debt transactions involved multiple parties, all of whom were jointly and severally liable for the $5,831,197 penalty under Section 6707(c), which imposes joint and several liability on material advisors for failure to register tax shelters. While the petitioner contested the penalty on the merits, other parties involved in the same transactions settled with the IRS and made payments toward the penalty, thereby reducing the total balance owed. By March 30, 2016, the IRS had recalculated the penalty to $4,351,138, reflecting payments made by others. A PowerPoint presentation prepared for a meeting that day between Mr. Cullinan and IRS officers from the Large Business and International Division detailed how the reduction was computed.

Shortly after the meeting, on April 4, 2016, the IRS issued the Penalty Notice (Form CP15), assessing the Section 6707 penalty in the reduced amount of $4,351,138. The notice did not include an updated penalty computation or explanation of how the reduction for payments by others was calculated. This omission became a central issue in later proceedings.

On June 28, 2016, the IRS mailed Letter 3172, Notice of Federal Tax Lien Filing and Your Right to a Hearing, regarding the $4,351,138 penalty. The petitioner appealed the lien filing by submitting Form 12153, Request for a Collection Due Process or Equivalent Hearing, marking the "Other" box and leaving alternatives unchecked. In the accompanying cover letter, the petitioner’s then-counsel challenged the underlying tax liability but did not raise any issue regarding compliance with Section 6751(a), which requires the IRS to include a detailed penalty computation with the notice.

Years of agreed postponements followed, and the petitioner’s representation changed. On April 23, 2020, the petitioner, now represented by counsel Ms. Moore, attended a Collection Due Process (CDP) hearing. It was at this hearing that the petitioner first raised noncompliance with Section 6751(a), arguing that the Penalty Notice “does not include a penalty computation” and that the IRS had not provided any details on “how amounts paid by others were calculated or credited.” The petitioner concluded that “[s]uch failure renders the assessment invalid under the statute.”

In response, Settlement Officer Atterberry documented her findings in the Case Activity Record on December 28, 2021, stating that “The IRS fully complied with IRC 6751(a), as they provided computation of the penalty via F886-A and exhibits. The penalty in this case was one percent of the total of several different client investments after reduction for the portions of the penalty for amounts paid by others. The penalty was properly calculated.”

On April 6, 2022, the IRS Appeals issued a Notice of Determination, concluding that the settlement officer had verified that all legal and administrative requirements were met and sustaining the filing of the federal tax lien. The petitioner filed a Petition in the U.S. Tax Court on May 4, 2022, assigning error to the IRS’s determinations, including the alleged failure to comply with Section 6751(a). The dispute over procedural compliance had now fully crystallized.

The Dispute: Did the IRS’s Omission Invalidate the Penalty?

The core dispute centered on whether the IRS’s failure to include a penalty computation in the final notice under Section 6751(a) invalidated the $4.35 million penalty. The petitioner argued the omission rendered the assessment invalid, while the IRS countered that the taxpayer had sufficient information to contest the penalty. The case hinged on whether the omission caused prejudice, as established in Graev v. Commissioner (2016). The IRS emphasized the petitioner’s delayed objection and active litigation of the penalty’s merits since 2013.

The Court’s Analysis: Procedural Errors and the Prejudice Standard

The Tax Court’s resolution of the petitioner’s challenge to the $4.35 million penalty hinged on a narrow but consequential question: whether the IRS’s omission of a penalty computation in the final notice invalidated the assessment. The court held that while the IRS’s failure to include a computation of the reduced penalty in the Penalty Notice was a procedural error, it did not rise to the level of a fatal defect because the petitioner suffered no prejudice. This ruling reinforced the principle that procedural errors under Section 6751(a) are curable if the taxpayer is not harmed by the omission, a doctrine the court traced back to Graev v. Commissioner.

The court began by acknowledging that the IRS had indeed committed a procedural error. The Notice of Penalty Assessment (NOPA) issued in 2016 included a computation of the original $5.83 million penalty, but the final Penalty Notice sent to the petitioner failed to include a computation of the reduced $4.35 million penalty. The court explicitly cited Graev v. Commissioner, 147 T.C. 460, 474 (2016), for the proposition that “procedural errors or omissions are not a basis to invalidate an administrative act or proceeding unless there was prejudice to the complaining party.” The court then applied this standard directly to the facts, noting that the petitioner had never alleged—or even suggested—that he was prejudiced by the omission. The court emphasized that the petitioner had all the information necessary to understand the penalty’s calculation, including the original computation in the NOPA and the IRS’s explanation of the reduction during the 2016 Appeals conference.

The court’s analysis also addressed the petitioner’s argument that the IRS bore the burden of proving the absence of prejudice. The petitioner contended that compliance with Section 6751(a) was an element of the penalty case and that the IRS’s insistence on a showing of prejudice was “simply unavailing.” The court rejected this contention outright, citing Graev for the principle that “procedural errors or omissions are not a basis to invalidate an administrative act or proceeding unless there was prejudice to the complaining party.” The court further noted that the petitioner’s failure to allege prejudice was telling, as there was no uncertainty about how the penalty was calculated. The NOPA clearly showed the basis for the original penalty, and the IRS had explained the computation for the reduced penalty during the Appeals conference. The court observed that the petitioner had been actively litigating the merits of the case since 2013 and had never requested an explanation of the penalty calculation, suggesting that he was not prejudiced by the omission.

The court’s reasoning also engaged with the broader statutory framework governing penalty assessments. It noted that Section 6751(a) does not specify any consequence for noncompliance, aligning with the Supreme Court’s holding in United States v. James Daniel Good Real Property, 510 U.S. 43, 63 (1993), that “if a statute does not specify a consequence for noncompliance with [a statutory provision], the federal courts will not in the ordinary course impose their own coercive sanction.” The court found this principle directly applicable to the petitioner’s claim, as Section 6751(a) contains no provision for invalidating a penalty for noncompliance with its computation requirement. The court further cited Scott v. Commissioner, T.C. Memo. 2007-91, slip op. at 23–24, aff’d, 262 F. App’x 597 (5th Cir. 2008), for the proposition that noncompliance with a similar penalty computation requirement—Section 6631—does not invalidate the assessment in the absence of prejudice.

In a final analytical step, the court addressed the petitioner’s argument that the IRS’s verification of compliance with Section 6751(a) during the Collection Due Process (CDP) hearing was an abuse of discretion. The court rejected this argument, noting that the petitioner had failed to demonstrate any prejudice from the IRS’s procedural error. The court held that the Appeals officer’s verification that the IRS “fully complied” with Section 6751(a) was not an abuse of discretion where the petitioner had not suffered any prejudice from the omission. This aspect of the ruling underscored the court’s willingness to defer to the IRS’s administrative determinations when the taxpayer could not show harm, even in the face of procedural irregularities.

The court’s analysis thus assumed significant judicial authority over the IRS’s penalty assessment process, not by invalidating the penalty outright, but by delineating the boundaries of procedural error and prejudice. By declining to impose a per se invalidation rule for Section 6751(a) noncompliance, the court effectively granted the IRS greater latitude to cure procedural defects without facing automatic penalty invalidation. This approach aligns with the court’s broader trend of balancing taxpayer protections with administrative efficiency, particularly in cases involving complex penalty regimes. The ruling also signaled the court’s deference to the IRS’s verification processes in CDP hearings, further reinforcing the IRS’s discretionary authority in penalty assessments.

Verification and Discretion: Did Appeals Abuse Its Authority?

The Tax Court’s deference to Appeals’ verification process in this case underscores the IRS’s broad discretion in penalty assessments, particularly when procedural compliance is at issue. The court’s analysis hinged on whether Settlement Officer Atterberry’s verification of § 6751(a) compliance—required under § 6330(c)(1) and (3)(A)—was sufficient and whether the IRS’s Appeals division abused its discretion in sustaining the penalty.

Section 6330(c)(1) mandates that Appeals officers, during a Collection Due Process (CDP) hearing, verify that the IRS has met “the requirements of any applicable law or administrative procedure.” This includes ensuring compliance with § 6751(a), which requires the IRS to provide a detailed computation of any penalty in the initial notice. The parties in this case agreed that Appeals officers bear this duty, and the court accepted their position without dissent. As the court noted, “The question before us then is whether as a matter of law Appeals abused its discretion by verifying that the IRS ‘fully complied’ with section 6751(a).”

Settlement Officer Atterberry’s verification was documented in the Case Activity Record, where she explicitly stated that the IRS had “fully complied” with § 6751(a). The court found this verification adequate, noting that her assessment was based on the petitioner’s possession of all necessary information to understand the penalty calculation. The IRS had provided a detailed computation in the Notice of Penalty Assessment (NOPA) for the original penalty of $5,831,197, and the reduced penalty of $4,351,138 was explained during the 2016 Appeals conference. The court emphasized that the petitioner never requested an explanation of the reduced penalty and had been actively litigating the merits of the case since 2013, indicating that he was fully aware of the IRS’s justification for the penalty.

The court’s analysis reflects a high degree of deference to Appeals’ verification process. It held that Settlement Officer Atterberry’s determination was not an abuse of discretion, as she had verified compliance with § 6751(a) and the petitioner suffered no prejudice from any procedural defect. The court reiterated its prior holding in Graev v. Commissioner, 147 T.C. 460, 474 (2016), that “procedural errors or omissions are not a basis to invalidate an administrative act or proceeding unless there was prejudice to the complaining party.” Since the petitioner did not allege prejudice—and the record showed he had all the information needed to contest the penalty—the court found no basis to overturn Appeals’ decision.

This ruling reinforces the Tax Court’s willingness to defer to the IRS’s administrative processes, particularly in CDP hearings where Appeals officers are tasked with verifying compliance. By accepting Appeals’ verification as sufficient, the court effectively granted the IRS greater latitude in penalty assessments, provided that the taxpayer is not prejudiced by procedural defects. The decision signals that the court will not second-guess the IRS’s internal verification processes unless there is clear evidence of abuse or prejudice, further solidifying the IRS’s discretionary authority in penalty cases.

Impact: What This Ruling Means for Taxpayers and the IRS

The Tax Court’s decision reinforces that procedural errors in penalty notices do not invalidate assessments unless taxpayers prove prejudice. This ruling limits taxpayers’ ability to challenge penalties on technical grounds while granting the IRS broader discretion to cure minor defects. For the IRS, the decision reduces the risk of abatements due to procedural oversights, allowing the agency to focus on substantive disputes. Taxpayers must now actively seek clarification if penalty notices lack sufficient detail, as the court’s deference to Appeals’ verification processes makes procedural challenges harder to sustain.

Key takeaways:

• Procedural errors under Section 6751(a) are curable unless they cause actual prejudice.
• The IRS’s verification processes in CDP hearings are given deference, making appeals of procedural rulings difficult.
• Taxpayers must proactively request detailed computations to avoid waiving objections.
• The ruling strengthens the IRS’s enforcement posture in cases involving complex tax shelters like DADTs.