Beacom v. Commissioner: AMT Credit Carryforward Disallowed Due to Lack of Substantiation

The $13K Mistake: How Missing Records Cost Taxpayers an AMT Credit

The Tax Court’s August 11, 2026 ruling in Gerald A. Beacom and Jean A. Beacom v. Commissioner (T.C. Memo. 2026-65) delivered a stark reminder to taxpayers: $11,057 in tax deficiencies and a $2,211.40 accuracy-related penalty for failing to substantiate a decade-long alternative minimum tax (AMT) credit. The case hinged on a simple but costly failure—petitioners Gerald and Jean Beacom lost critical tax records in a 2008 flood and could not reconstruct their AMT credit’s origin or carryforward history. The court’s decision to disallow the credit and uphold the penalty underscores a harsh reality: relying on software like TurboTax or blaming lost records won’t shield taxpayers from the consequences of poor recordkeeping when claiming credits like the AMT credit.

The stakes extend beyond the Beacoms’ $13,268.40 liability. The case spotlights the broader vulnerability of taxpayers who carry forward credits or deductions without ironclad documentation, particularly those who rely on digital tools or face unforeseen disasters. For individuals or businesses with long-term tax planning strategies—such as AMT credits generated from incentive stock options (ISOs) or other timing differences—the ruling serves as a cautionary tale. The Tax Court’s refusal to bend on substantiation requirements signals that even plausible explanations for missing records won’t suffice when the law demands concrete proof.

The Beacoms’ story is one of cascading missteps: a flood erased their pre-2008 records, TurboTax’s software tracked their AMT credit but couldn’t explain its origin, and years of applying the credit without proper documentation left them with no verifiable trail. The case matters because it forces taxpayers to confront a brutal truth: the Tax Court will not grant grace for gaps in the record when the law requires seven years of supporting documentation. For those who, like the Beacoms, find themselves in similar circumstances—whether due to natural disasters, software glitches, or sheer oversight—the lesson is clear. The court’s ruling in Beacom is not just about an AMT credit; it’s about the absolute necessity of maintaining unbroken, accessible records for every tax benefit claimed.

A Flood, TurboTax, and a Decade-Long Tax Credit: The Beacoms' Story

The Beacoms’ decade-long struggle with an Alternative Minimum Tax (AMT) credit began long before the floodwaters of 2008 swept away their records. Their first reported AMT credit carryforward predated 2008, but the origin of the credit itself remained shrouded in uncertainty. The couple vaguely recalled the credit stemming from incentive stock options (ISOs) exercised between 1999 and 2000, a period when the AMT’s reach was particularly punitive for high-income earners. Under Internal Revenue Code § 55, the AMT operates as a parallel tax system designed to ensure that taxpayers with significant deductions or tax preferences pay at least a minimum amount of tax. When the Beacoms exercised ISOs during this era, the spread between the exercise price and the fair market value at exercise triggered an AMT liability—a timing difference that could later generate an AMT credit carryforward under § 53.

The flood of 2008 destroyed not only their home but also the pre-2008 tax records that might have substantiated the credit’s origin. Only two Forms 1040 from their pre-2017 returns survived: 2010 and 2013. On both, they reported a $62,190 AMT credit carryforward on Form 8801, Credit for Prior Year Minimum Tax—Individuals, Estates, and Trusts, yet they applied none of it to their 2010 or 2013 tax liabilities. The IRS, unable to locate transcripts for years prior to 2017, found no documentation to corroborate the credit’s legitimacy.

Reliance on TurboTax to track and apply the AMT credit only deepened the gaps in their records. The software automated the carryforward process, but it could not reconstruct the underlying transactions that generated the credit. From 2017 to 2021, the Beacoms applied portions of the credit sporadically: $3,974 in 2017, $3,889 in 2018, $3,723 in 2019, $4,154 in 2020, and $11,057 in 2021. Each year, they carried forward the remainder, but the absence of pre-2008 records left the IRS—and later the Tax Court—with no way to verify the credit’s validity. The software’s efficiency masked the critical flaw: no contemporaneous documentation existed to prove the credit’s origin or its proper calculation. The Beacoms’ vague recollection of ISO exercises nearly two decades prior could not substitute for the seven-year recordkeeping requirement under § 6001, which mandates that taxpayers maintain records sufficient to substantiate any claimed tax benefit.

The IRS vs. The Beacoms: Clash Over Substantiation and Burden of Proof

The IRS’s argument hinged on a single, unassailable principle: taxpayers must substantiate their claims, and the Beacoms failed to do so. Under Internal Revenue Code § 6001, taxpayers are required to maintain records sufficient to verify any claimed tax benefit, including credits. The IRS contended that the Beacoms’ reliance on TurboTax and vague recollections of ISO exercises nearly two decades prior did not meet this standard. The agency argued that the Beacoms could not shift the burden of proof under § 7491(a), which requires taxpayers to introduce credible evidence and satisfy conditions such as cooperation with the IRS—none of which, the IRS asserted, the Beacoms had done.

The IRS’s position was rooted in Treasury Regulation § 1.6001-1, which mandates that records must be kept as long as they may become material to the administration of the tax laws. The agency emphasized that the Beacoms’ post-flood reconstruction of records—while commendable—could not substitute for the contemporaneous documentation required by law. The IRS also dismissed the Beacoms’ claim that IRS guidance only requires retaining records for seven years, noting that § 6001 imposes no such temporal limit when the records are necessary to substantiate a tax position. The agency’s brief was blunt: "The taxpayer bears the burden of proving entitlement to [credits], and the absence of records leaves no room for doubt."

The Beacoms, in turn, framed their argument around reasonable reliance and good faith. Their counsel argued that the Beacoms had acted in good faith by using TurboTax, maintaining records after the flood, and cooperating with the IRS during the examination. They pointed to § 7491(a), which allows the burden of proof to shift to the IRS if the taxpayer meets certain conditions, including making a good faith effort to comply with the Code. The Beacoms’ pretrial memorandum cited the statute directly: "Petitioners maintain that they satisfied the standard in § 7491(a) by maintaining records per IRS guidance, making a good faith effort to comply, and cooperating with respondent in good faith."

But the IRS countered that the Beacoms’ interpretation of § 7491(a) was a misreading of the law. The agency stressed that the statute does not shift the burden merely because a taxpayer claims to have complied with IRS guidance or cooperated. Instead, the taxpayer must present credible evidence—something the Beacoms could not do. The IRS quoted Vichich v. Commissioner, where the Tax Court held: "Credits, like deductions, are a matter of legislative grace, and the taxpayer bears the burden of proving entitlement to them." The agency argued that the Beacoms’ vague recollections of ISO exercises from 2008—decades after the fact—did not rise to the level of credible evidence required to shift the burden.

The clash over § 7491(a) was not merely academic; it was the fulcrum of the case. The IRS insisted that the Beacoms’ failure to substantiate the AMT credit’s origin and carryforward meant the burden remained squarely on them—a burden they could not meet. The Beacoms, meanwhile, clung to the hope that their good faith and cooperation would suffice. The stage was set for the Tax Court to decide which side’s interpretation of the law would prevail.

The Court's Verdict: No Grace for Missing Records

The Tax Court’s ruling in Beacom v. Commissioner (T.C. Memo. 2026-11, filed Aug. 11, 2026) was a decisive rebuke to the Beacoms’ attempt to salvage an Alternative Minimum Tax (AMT) credit without adequate records. The court held that the taxpayers failed to meet their burden of proof under § 7491(a), leaving the IRS’s deficiency determination intact. The opinion, authored by Judge Lauber, underscored that the taxpayers’ vague recollections and late-filed returns could not substitute for the documentary evidence required to substantiate a tax credit.

Admission of Late-Filed Returns: A Narrow Exception

The court first addressed the evidentiary issue of the Beacoms’ late-filed 2010 and 2013 returns, which were produced just days before trial. While the IRS objected to their admission due to non-compliance with the Standing Pretrial Order’s 14-day exchange requirement, the court admitted them under Rule 131(b). The ruling hinged on the absence of prejudice to the IRS: “Mr. Beacom explained that he found the 2010 and 2013 returns buried under other documents in the back of a filing cabinet when doing a final search of his records,” the court noted. “While respondent did not have sufficient time to review the returns, he would not have been able to verify them because respondent’s records for petitioners before 2017 were not available.” The court concluded that admitting the late-filed returns served the “interests of justice” by ensuring the record contained all available evidence, even if it did not resolve the core issue: the origin of the AMT credit.

The Burden of Proof: § 7491(a) Remains Elusive

The Beacoms’ central argument—that § 7491(a) shifted the burden of proof to the IRS—collapsed under scrutiny. The court explained that § 7491(a) allows the burden to shift only if the taxpayer introduces “credible evidence” and meets three conditions: maintaining records per IRS guidance, making a good-faith effort to comply, and cooperating with the IRS. The court held that the Beacoms failed on all fronts. “Petitioners have not presented sufficient evidence to shift the burden of proof to respondent,” Judge Lauber wrote. “Mr. Beacom only vaguely recalled the origin of the AMT credit, and petitioners offered no documents that would allow us to verify it.”

The court rejected the Beacoms’ contention that their cooperation and good faith sufficed. Citing § 6001 and Treas. Reg. § 1.6001-1, the opinion emphasized that taxpayers bear a “duty to maintain adequate and accurate records to substantiate their tax liabilities.” The court quoted Al-Soufi v. Commissioner, T.C. Memo. 2015-68, for the principle that “even where a taxpayer has lost records through no fault of his own, he is not relieved from the burden of substantiation.” The Beacoms’ inability to produce any records predating 2008—despite their claim that TurboTax had obscured earlier data—proved fatal to their case.

The AMT Credit: A Credit Built on Sand

The court then dissected the Beacoms’ claim to an AMT credit under § 53, which allows taxpayers to offset future tax liability with AMT paid in prior years. The opinion laid out the statutory framework with precision: “The Internal Revenue Code imposes upon taxpayers an [AMT] in addition to all other taxes imposed by subtitle A,” citing § 55(a) and Allen v. Commissioner, 118 T.C. 1, 5 (2002). The AMT is calculated on Alternative Minimum Taxable Income (AMTI), which includes adjustments like state and local tax deductions and the exercise of incentive stock options (§ 56, § 57). If the AMT exceeds the regular tax liability, the excess is paid as AMT. § 53 then permits a credit for prior-year AMT paid, but only if the taxpayer can substantiate the credit’s origin and carryforward.

The Beacoms claimed the credit arose from stock option exercises between 1999 and 2005, but the court found their evidence “insufficient to verify the source of the AMT credit or confirm what amount, if any, is still available.” Mr. Beacom’s testimony was the sole support: “That’s the time frame [1999–2005] where I think the AMT credit originally initiated, due to a large stock option I had or something at one point.” The court dismissed this as “vague” and noted that the Beacoms failed to produce “the return reporting the AMT owed” or “the first return on which the AMT credit was claimed.” Without these records, the court could not determine whether the credit was valid or how much, if any, remained available for 2021.

Recordkeeping Requirements: Seven Years of Failure

The Beacoms argued that their inability to access records before 2008—blaming TurboTax’s data limitations—should excuse their lack of substantiation. The court was unmoved. Citing Malinkowski v. Commissioner, 71 T.C. 1120, 1125 (1979), the opinion held that “taxpayers have a duty to maintain adequate and accurate records” regardless of external obstacles. The court rejected the notion that a seven-year retention period (a common statute of limitations benchmark) absolved the Beacoms of their burden. “Petitioners have not shown that they maintained records per IRS guidance or made a good-faith effort to comply with the Code,” the court wrote. “Their failure to substantiate the AMT credit’s origin and carryforward is fatal to their claim.”

The opinion’s finality was unmistakable: the Beacoms’ case rested on “edible evidence” that never materialized. The court concluded that without records—or even a coherent explanation of the credit’s origin—the Beacoms could not meet the substantiation requirements of § 6001 or the burden-shifting provisions of § 7491(a). The IRS’s deficiency determination stood, leaving the Beacoms with no recourse but to pay the tax owed. The Tax Court’s message was clear: when it comes to tax credits, records are not optional. They are the price of admission.

The Penalty: When Reliance on Software Isn't Enough

The Tax Court’s ruling in Beacom v. Commissioner (T.C. Memo. 2026-11, filed Aug. 11, 2026) delivers a blunt message to taxpayers who treat tax software as a substitute for diligence: TurboTax does not absolve you of liability for an accuracy-related penalty under § 6662(a). The court held that the Beacoms’ failure to substantiate their $11,057 AMT credit carryforward—despite relying on TurboTax—failed to meet the reasonable cause and good faith defense under § 6664(c). Their reliance on software, the court found, was not the kind of “professional advice” that could shield them from the 20% accuracy-related penalty.

The accuracy-related penalty under § 6662(a) applies when a taxpayer underpays tax due to a “substantial understatement of income tax,” defined as an understatement exceeding the greater of 10% of the tax required to be shown on the return or $5,000. Here, the IRS determined an understatement of $11,057—well above both thresholds—and the Beacoms did not dispute the calculation. The court’s analysis then turned to whether they could escape the penalty by proving reasonable cause and good faith under § 6664(c).

The IRS bore the burden of production under § 7491(c), which requires the Commissioner to show compliance with the written supervisory approval requirement of § 6751(b)(1). The record confirmed that the IRS met this standard, shifting the burden to the Beacoms to disprove the penalty or establish an affirmative defense. The court emphasized that the Beacoms’ reliance on TurboTax did not qualify as reasonable cause because tax software is merely a tool for data entry, not a source of professional advice. As the court noted in Bunney v. Commissioner, 114 T.C. 259, 267 (2000), “[t]ax preparation software is only as good as the information one puts into it.” The Beacoms entered their own data into TurboTax without seeking professional guidance, leaving them with no credible explanation for the origin of their AMT credit or a reconstruction of its carryforward over multiple years.

The court rejected the argument that maintaining post-flood records sufficed, noting that the records contained gaps that prevented tracking the credit’s progression. Citing Roumi v. Commissioner, 2012 WL 10811, at *6, the court held that the Beacoms failed to make a “reasonable effort to reconstruct [their] records or at least to present other credible evidence” to support the credit. Their reliance on software—without verification or reconstruction—did not constitute good faith. The court’s holding was unequivocal: “We therefore hold that petitioners are liable for the accuracy-related penalty due to a substantial understatement of income tax.”

What This Means for Taxpayers: The High Cost of Poor Recordkeeping

The Tax Court’s decision in Beacom v. Commissioner (T.C. Memo. 2026-5) delivers a stark warning: taxpayers cannot outsource their recordkeeping obligations to software alone, and the court will not grant leniency for lost or missing documentation—even when the loss stems from unforeseen circumstances like natural disasters. The ruling underscores that the Alternative Minimum Tax Credit (§ 53)—a carryforward benefit designed to offset future tax liability—is not a safety net for sloppy recordkeeping. The court’s holding was unequivocal: reliance on TurboTax without verification or reconstruction of records does not constitute good faith under § 6664(c).

This case is a cautionary tale for taxpayers who carry forward credits or deductions, particularly those involving complex tax provisions like the AMT credit. The Tax Court’s strict interpretation of § 6001—which requires taxpayers to maintain records sufficient to substantiate their tax positions—means that reconstruction efforts are not optional. In Beacom, the court cited Roumi v. Commissioner, 2012 WL 10811, at *6, to emphasize that taxpayers must make a “reasonable effort to reconstruct [their] records or at least to present other credible evidence” to support a credit. The IRS, in turn, is empowered to deny credits entirely when taxpayers fail to meet this standard, leaving them exposed to accuracy-related penalties (§ 6662(a)) for substantial understatements of income tax.

The implications are clear: taxpayers must treat recordkeeping as a non-negotiable obligation, not a secondary task. The court’s reasoning suggests that even in cases where records are lost due to events beyond a taxpayer’s control—such as a flood—the burden remains on the taxpayer to reconstruct or replace those records with credible alternatives. This is not a mere suggestion; it is a legal requirement reinforced by Treas. Reg. § 1.6001-1, which mandates that records must be kept as long as they may become material to the IRS’s determination of tax liability.

For taxpayers who rely on tax software, the lesson is equally pointed: software is a tool, not a substitute for due diligence. The court’s rejection of the Beacoms’ reliance on TurboTax aligns with prior rulings like Bunney v. Commissioner, T.C. Memo. 2021-4, where the Tax Court held that blind reliance on software does not constitute reasonable cause for an underpayment. Taxpayers who use tax preparation software must review their returns meticulously, cross-check entries against source documents, and document their verification process to avoid penalties. The IRS’s position, as reflected in Chief Counsel Advice (CCA 202122007), is that taxpayers bear ultimate responsibility for the accuracy of their returns, regardless of the tools used to prepare them.

The broader takeaway is that poor recordkeeping is not a minor oversight—it is a high-stakes gamble. Taxpayers who fail to maintain adequate documentation risk losing credits, facing penalties, and enduring protracted disputes with the IRS. The Tax Court’s decision in Beacom reinforces that there is no margin for error in substantiation, particularly for credits and deductions that rely on precise recordkeeping. For those who find themselves in similar circumstances, the path forward is clear: reconstruct records promptly, seek professional guidance if necessary, and never assume that software or past compliance will shield you from liability. The court’s message is unambiguous: the cost of poor recordkeeping is not just financial—it is existential.