Tax Court Rules Against Taxpayer in APTC Repayment Dispute: $11,436 Deficiency Upheld

The $11,436 Mistake: Taxpayer Loses APTC Eligibility Due to Filing Status Error

When Ingrid Maria Persson of California learned she owed the IRS $11,436 for tax year 2019; a sum equal to the advance premium tax credit (APTC) she had received; the Tax Court’s February 9, 2026 ruling in Persson v. Commissioner (T.C. Summary Opinion 2026-2) underscored the IRS’s authority to claw back improperly claimed credits. The court held that Persson’s incorrect filing status (checking “single” instead of “married filing separately”) and her household income exceeding 400% of the federal poverty line (FPL) disqualified her from APTC eligibility. The decision reaffirmed the Tax Court’s power to uphold IRS deficiency determinations in small tax cases, where taxpayers bear the burden of proof. For the 1.2 million Americans who relied on APTC in 2025, the case serves as a cautionary tale: a single checkbox error can trigger a six-figure tax bill.

A Chronology of Errors: Key Missteps in Filing and Income Reporting

In 2019, Ingrid Maria Persson and her husband, Jose Llocclla-Diaz, enrolled in a Kaiser health insurance plan through Covered California. The couple received $22,872.08 in Advance Premium Tax Credits (APTC) to offset annual premiums of $25,354.56. The IRS later issued a Form 1095-A, which Persson needed to reconcile on her 2019 federal tax return.

On May 13, 2021, Persson filed her 2019 Form 1040 as "single" despite being married. The return included a Form 8962 with a household size of two and reported income of $73,763, but most of the form was left blank. The IRS processed the return and made a math error adjustment, reducing her AGI to $71,891. An examination began on June 11, 2021.

On July 8, 2021, Persson’s case was escalated to the Taxpayer Advocate Service after she contacted her congressman. The IRS issued a Notice of Deficiency on December 3, 2021, proposing an APTC-related deficiency. On September 6, 2021, Persson and her husband entered an installment agreement covering tax years 2015–2019, with a balance of $23,141.24, but this did not resolve the APTC issue.

On December 16, 2021, Persson filed a second 2019 Form 1040 without indicating her filing status or her husband’s presence. She also submitted a revised Form 8962, reporting a household size of two and income of $59,063. The IRS issued a Notice of Deficiency on March 18, 2022, determining a $11,436 deficiency for APTC ineligibility. Persson filed a Petition with the Tax Court on April 5, 2022, challenging the deficiency.

The Dispute: APTC Eligibility and Installment Agreement Limits

The IRS’s deficiency notice for 2019 focused on two issues: Persson’s eligibility for the Advance Premium Tax Credit (APTC) and whether the deficiency could be absorbed into her existing installment agreement.

Persson argued the installment agreement, finalized on September 6, 2021, should cover the entire 2019 deficiency, including the $11,436 APTC clawback. She claimed an IRS employee, Ms. Fleming, had assured her the agreement resolved all 2019 adjustments. The IRS countered that her eligibility for APTC was invalid under Section 36B(c)(1)(C), which requires married taxpayers to file jointly unless an exception applies. Persson admitted filing as married filing separately, disqualifying her from APTC. The IRS also noted her household income exceeded 400% of the FPL ($67,640 for a family of two in 2019), rendering her ineligible regardless of filing status. Even if eligible, her MAGI of $71,891 would have triggered full APTC repayment under Section 36B(f)(2)(A).

The IRS maintained the installment agreement only covered the preexisting math error adjustment and did not extend to later deficiencies like the APTC clawback. Relying on Section 6159(a), the agency argued installment agreements are payment arrangements, not contracts, and do not bar additional deficiencies. Citing United States v. Ullman, the IRS asserted the agreement lacked mutuality, as taxpayers are already legally obligated to pay taxes.

Court's Reasoning: Statutory Rigidity Dooms the Petitioner

The court’s analysis centered on two legal realities: the IRS’s presumption of correctness in deficiency determinations and the rigid statutory requirements for APTC eligibility. The IRS’s deficiency notice carried a presumption of correctness under Welch v. Helvering, 290 U.S. 111 (1933), and Persson bore the burden of disproving it under Rule 142(a) and IRC §7491(a); a burden she failed to meet. The court noted the deficiency was based on a math error adjustment and APTC overpayment, both supported by documentary evidence, including Persson’s tax returns and Marketplace records.

Persson’s fate was sealed by her failure to meet APTC eligibility requirements under IRC §36B. The court first addressed the filing status requirement: Section 36B(c)(1)(C) mandates married taxpayers file jointly unless an exception applies. Persson admitted filing as single despite being married, a fatal error. The court rejected her argument, stating the statute’s plain language leaves no room for discretion: "Married couples must file a joint return to qualify for the APTC unless an exception applies." Persson did not demonstrate any exception, leaving her statutorily ineligible.

The court then addressed the income threshold requirement. APTC is available only to taxpayers with household income between 100% and 400% of the FPL. Persson’s MAGI of $71,891 exceeded 400% of the FPL for a family of two in California in 2019 ($67,640), rendering her ineligible regardless of filing status. Even if eligible, her income would have triggered full APTC repayment under Section 36B(f)(2)(B).

The court also rejected Persson’s argument that the IRS’s deficiency determination violated her installment agreement. Citing United States v. Ullman, the court held installment agreements under Section 6159(a) are payment arrangements, not contracts, and do not extinguish underlying tax liability. The agreement dated September 6, 2021, only covered the math error adjustment and did not include the later-determined APTC deficiency. The court further noted Section 6159(c)(2) permits the IRS to assess additional deficiencies even after an installment agreement is in place.

The Fallout: Key Lessons for Taxpayers Relying on APTC

The Tax Court’s decision in Persson v. Commissioner serves as a cautionary tale for taxpayers relying on APTC. The ruling underscores that statutory compliance is non-negotiable, even when IRS employees provide erroneous guidance.

The most critical takeaway is the absolute importance of correct filing status. Section 36B mandates married taxpayers file jointly unless an exception applies. Filing separately forfeits APTC eligibility entirely, regardless of financial need. Taxpayers must recognize that this is a bright-line rule, not subject to discretion.

The case also highlights the risks of exceeding income thresholds. While the Inflation Reduction Act temporarily removed the 400% FPL cap for APTC eligibility through 2025, the repayment provisions remain intact. Taxpayers near this threshold must precisely estimate income or risk owing substantial sums; there is no equitable relief for miscalculations. The court’s refusal to consider financial hardship signals that statutory limits are absolute.

Additionally, the ruling exposes the limitations of installment agreements. The IRS’s post-agreement deficiency determination demonstrates that installment agreements do not immunize taxpayers from audits or additional assessments. Under Section 6159, the IRS retains authority to assess deficiencies even after an agreement is in place, provided the taxpayer fails to meet ongoing compliance obligations.

Finally, the case reaffirms that IRS employee assurances are non-binding. Taxpayers cannot rely on verbal or written guidance from IRS employees to justify noncompliance. The only safeguard is documented, accurate tax filings, particularly Form 8962, which reconciles APTC with actual income. Failure to file this form correctly will result in automatic disallowance of the PTC, as the IRS cross-references Marketplace data with tax returns.

The decision may embolden the IRS to pursue similar cases involving APTC eligibility, particularly as it ramps up audits of high-income taxpayers. Tax professionals should anticipate increased scrutiny of filing status discrepancies, income reporting errors, and reconciliation form omissions. For taxpayers, the message is clear: APTC is a privilege contingent on strict adherence to the law.