Refund generated by IRS computer error is rebate refund

The Tax Court determined that an IRS computer error that misidentified the taxpayer’s additional child tax credit (ACTC) produced a substantive recalculation of her tax imposed for 2020, classifying the resulting overpayment as a rebate refund and sustaining a corresponding deficiency recoverable through deficiency procedures.

Facts: In 2021, Juliet R. El timely filed her 2020 Form 1040, U.S. Individual Income Tax Return. Her 2020 income consisted of $6,881 in wages and $16,623 in unemployment compensation. El had one qualifying child, who was under 17 years old in 2020. She properly claimed him as a qualifying child for purposes of the child tax credit (CTC). Her federal income tax before credits was $488, which the nonrefundable portion of the CTC reduced to zero. She correctly calculated her refundable ACTC as $1,400, plus a refundable earned income tax credit (EITC) of $2,913 and $958 of excess tax withheld, for a total overpayment of $5,271. She requested a refund of that amount by direct deposit.

In March 2021, El received a refund of $21,035–$15,764 more than she had claimed. The excess arose from an error in the IRS computer system that, while processing her Schedule 8812, Additional Child Tax Credit, incorrectly recorded her ACTC as $17,164, which corresponded to the amount of earned income she reported on her Schedule 8812 rather than the $1,400 she had reported. This incorrect amount increased her total refundable credits from $1,400 to $20,077 and her total overpayment from $5,271 to $21,035, generating the $15,764 excess payment.

In July 2023, the IRS issued a notice of deficiency for $15,764. The accompanying Form 4549, Income Tax Examination Changes, showed a corrected tax liability of zero, which was identical to what El had reported, but applied a negative ACTC adjustment of $15,764 to arrive at the balance due. El filed a petition in Tax Court on Oct. 3, 2023. Both parties moved for summary judgment and agreed that the main issue in dispute was whether the $15,764 excess refund was a rebate refund or a nonrebate refund, with a secondary issue being whether any deficiency could exist, given that El’s tax liability was zero on both her return and the Form 4549.

Issues: Every IRS refund is classified as either a rebate refund or a nonrebate refund, and only rebate refunds factor into the deficiency formula under Sec. 6211(a). A rebate is defined as an adjustment made when the IRS finds a mismatch between the tax imposed and the tax reported that favors the taxpayer (YRC Regional Transportation, Inc., T.C. Memo. 2014-112). When the IRS erroneously issues a rebate because it mistakenly believes the taxpayer owed less than the tax imposed, the erroneous refund gives rise to a deficiency that revives the tax liability and permits a supplemental assessment. A nonrebate refund falls entirely outside the deficiency definition, meaning the IRS cannot use deficiency procedures to recover it and is instead limited to a refund suit under Sec. 7405.

Both parties relied heavily on Thomas, T.C. Memo. 2014-118, in which the IRS had entered the taxpayers’ taxable Social Security benefit into an incorrect line on Form 1040, triggering an erroneous refund. The Tax Court held in that case that the mistaken entry produced “a substantive recalculation” of the tax imposed, making the refund a rebate refund. El argued that Thomas was distinguishable because it involved multiple intermediate steps between the error and the refund, suggesting an intentional adjustment, whereas the error in her case was a purely automatic computer mistake more analogous to a clerical error. She also pointed to Form 4549, which reflected a corrected tax liability of zero (matching her return), as evidence that no recalculation had taken place. The IRS countered that substituting a different ACTC amount recalculated the tax imposed, regardless of how the error arose.

The court rejected both parties’ framing of their analysis, finding that both sides “incorrectly direct their attention to whether the error … was a ‘substantive recalculation’ instead of whether the error led to a substantive recalculation of [the taxpayer’s] tax imposed.” The correct inquiry, the court held, is solely “whether the taxpayer’s tax imposed was recalculated.” A refund qualifies as a rebate refund when it is “based on a ‘substantive recalculation’ of the tax imposed that shows the taxpayer owes less tax than the amount shown on the taxpayer’s return.” Under that standard, the IRS’s mistaken belief that El was entitled to a $17,164 ACTC led to a recalculation of her tax imposed under Sec. 6211(b)(4)(A), and the computer-generated origin of the error was irrelevant to that conclusion.

The court also addressed a line of authority suggesting that nonrebate refunds are those issued because of a clerical or computer error, an inference that might have favored El. The court rejected it, observing that “all erroneous refunds are issued because of some mistake, computation, clerical, or otherwise.” The source of the error is therefore not a valid criterion. The proper test is relational: “If it is a refund related to the recalculation of [a taxpayer’s] tax liability, then it constitutes a rebate. If it is unrelated to a recalculation of tax liability, then it is … a nonrebate refund” (quoting Lesinski, T.C. Memo. 1997-234).

El alternatively argued that no deficiency could exist because her tax liability was zero on both her return and Form 4549. The court turned to Sec. 6211(b)(4), which requires the ACTC and the EITC to “be taken into account as negative amounts of tax” for purposes of computing a deficiency. Applying this provision, El’s actual tax imposed was -$4,313 — not zero — reflecting her legitimately claimed refundable credits. Incorporating the erroneous rebate of $15,764 into the formula produced a deficiency of -$4,313 + $20,077, or $15,764. The court noted that “the excess of the tax shown on a taxpayer’s return over rebates made, for the purpose of computing a deficiency, can be a negative number” (quoting Galloway, 149 T.C. 407, 415–16 (2017)) and that Sec. 6211(b)(4) was designed precisely to allow recalculating tax under deficiency procedures where refundable credits cause a taxpayer’s income tax liability to be zero or negative. El’s reliance on Form 4549 was unavailing because that form “do[es] not contemplate negative amounts of tax,” even though the deficiency formula does.

Holding: The Tax Court granted the IRS’s motion for summary judgment and denied El’s. The court held that the IRS “substantively recalculated, albeit erroneously, [the taxpayer’s] tax imposed for the 2020 tax year resulting in the issuance of a rebate refund,” creating a deficiency of $15,764 recoverable through deficiency procedures. The computer-generated origin of the error was held immaterial to that classification.

The court further held that Sec. 6211(b)(4) expressly permits a deficiency determination when a taxpayer’s income tax liability is zero or negative, because refundable credits such as the ACTC are treated as negative amounts of tax in the deficiency formula. El’s zero-liability argument failed because the statutory formula, properly applied, yielded a deficiency of $15,764, irrespective of the figures shown on Form 4549.

• El, T.C. Memo. 2026-17

— Thomas Godwin, CPA, CGMA, Ph.D., and John McKinley, CPA, CGMA, J.D., LL.M., are both professors of the practice in accounting and taxation in the SC Johnson College of Business, and Chelsea Xian, MPS, is a recent graduate of the SC Johnson College of Business, all at Cornell University in Ithaca, N.Y. To comment on this column, contact Paul Bonner, the JofA‘s tax editor.