A new federal deduction worth up to $6,000 for single filers and $12,000 for married couples is showing up on 2025 tax returns for the first time this filing season, stacked on top of the existing standard deduction for taxpayers 65 and older. The break was created by last year’s tax and spending law and runs only through the 2028 tax year, phasing out above set income levels rather than applying to every retiree equally. For the taxpayers who requested more time to file, the window to claim it on a 2025 return closes October 15, according to the Internal Revenue Service. The overlap between a new tax break and an old deadline is drawing fresh attention as filing season enters its final weeks.
How the enhanced deduction for seniors is calculated
The break, formally called the enhanced deduction for seniors, is a provision of the Working Families Tax Cuts written into the tax law Congress passed in 2025. The deduction stacks on top of the regular senior standard deduction rather than replacing it, giving an eligible taxpayer both write-offs in the same tax year rather than one in place of the other.
Effective for tax years 2025 through 2028, an individual who turns 65 or older by the last day of the tax year can claim an additional deduction of up to $6,000, or $12,000 for a married couple if both spouses qualify, according to the IRS. To claim it, a taxpayer needs a valid Social Security number, and a married taxpayer must file a joint return to qualify; the amount is entered on Schedule 1-A, a new form the IRS created specifically for the law’s additional deductions.
The deduction is not automatic. Tax software or a paid preparer has to apply it through Schedule 1-A, and a taxpayer who already filed a 2025 return without claiming it can still amend that return to add it later, since the eligibility window runs through the 2028 tax year regardless of when any single year’s return happens to be filed or corrected.
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The income phaseout that shrinks the deduction for higher earners
The $6,000 figure is a ceiling, not a flat amount every eligible filer receives. The deduction phases out for taxpayers with modified adjusted gross income above $75,000 for single filers and $150,000 for married couples filing jointly, according to the same IRS guidance covering eligibility. A filer above that threshold sees the deduction reduced on a sliding scale tied to income rather than losing it all at once at a single cutoff point.
The phaseout means higher-income retirees, particularly those drawing a pension alongside Social Security, taxable account withdrawals or dividend income, will see only a partial version of the write-off or none at all. A single filer with $85,000 in modified adjusted gross income is $10,000 over the threshold, which reduces the deduction well below the full $6,000 under the phaseout formula built into the law.
Because the calculation runs on modified adjusted gross income rather than taxable income, a filer sitting near either threshold cannot easily plan around it once a tax year has already closed. A retiree weighing a larger required minimum distribution, a Roth conversion or a lump-sum withdrawal in a given year has an added reason to check how that decision interacts with the $75,000 and $150,000 lines before the income actually lands on a return.
The four-year window is itself a boundary worth noting. Unless Congress extends or changes the provision, the enhanced deduction is scheduled to disappear after the 2028 tax year, which gives retirees currently near either phaseout threshold only a handful of filing seasons to plan withdrawals, Roth conversions or account timing around it before the break expires on its own.
Why the October 15 extension deadline matters for this deduction
Anyone who requested an automatic extension on a 2025 return has until October 15, 2026, to file it, according to an IRS reminder issued in April. An extension only pushes back the filing deadline; taxes owed were still due by April 15, and interest on any unpaid balance has been accruing since then regardless of the extension itself.
For someone eligible for the enhanced senior deduction, October 15 is also effectively the last routine chance to claim it on a timely 2025 return, since Schedule 1-A has to be filed with the return itself. A taxpayer who requested the extension using Form 4868, through IRS Free File, or by paying online and selecting the extension option all reach the same October 15 cutoff regardless of which method was used.
The IRS has repeated the same guidance across multiple releases this filing season: an extension buys time to file, not time to pay, and separate penalties can still apply to any 2025 balance still owed if the return itself goes unfiled past October 15. For extension filers claiming the enhanced deduction, the new tax break and the final 2025 filing deadline now sit on the same date on the calendar.
Timing the Senior Deduction Against RMDs and IRMAA Brackets
The enhanced deduction’s income phaseout raises a question the return itself does not answer: how a given year’s Social Security, pension and withdrawal income should be timed to stay under the applicable phaseout line, or how much it costs to go over it. That question sits next to related tradeoffs the same modified adjusted gross income figure controls, including Medicare’s IRMAA surcharge tiers.
The Retirement Tax & Withdrawal Planner is a 12-page planner built around four calculators covering provisional income, IRMAA tier, RMD schedule and Roth bracket fill, along with a section on the senior deduction and the account withdrawal order that affects all of them.
Compare account withdrawal scenarios against the phaseout thresholds with The Retirement Tax & Withdrawal Planner.
This article was researched and drafted with the assistance of AI and reviewed by The Money Overview editorial team.
