The new senior deduction for 2025–2028: who qualifies, the 6-cents-per-dollar phaseout, and the two big retirement numbers it doesn’t touch.
The 2025 tax law (the One Big Beautiful Bill Act) created a new deduction for anyone 65 or older: up to $6,000 per qualifying person — up to $12,000 for a couple where both spouses qualify — for tax years 2025 through 2028.
Three features make it unusually generous:
A valid Social Security number is required, and you must be 65 by the end of the tax year. Simple so far. The catch is in the next section.
The deduction shrinks by 6 cents for every dollar of modified adjusted gross income above a threshold — and disappears entirely $100,000 later:
| Filing status | Full deduction below | Shrinking between | Gone at |
|---|---|---|---|
| Single (65+) | $75,000 MAGI | $75,000 – $175,000 | $175,000 |
| Married filing jointly (both 65+) | $150,000 MAGI | $150,000 – $250,000 | $250,000 |
Notice who lives inside that shrinking band: retirees with meaningful IRAs, taking withdrawals or weighing conversions. Which is exactly why the phaseout isn’t a footnote — it’s a hidden tax rate, and it prices every marginal dollar you add.
Here’s the mechanism most coverage misses. A Roth conversion raises MAGI. Inside the phaseout band, each converted dollar doesn’t just get taxed at your bracket rate — it also claws back 6 cents of deduction (12 cents for a couple where both spouses’ deductions are phasing). Losing a deduction means more income gets taxed, so the effective rate on that dollar is roughly your bracket plus the clawback’s bracket-rate cost.
A hypothetical: a 66-year-old couple in the 22% bracket converting through the $150,000–$250,000 band. Each dollar converted pays 22% directly, and the 12-cent deduction clawback exposes another 12 cents to that same 22% — roughly 2.6 additional points, for an effective rate near 24.6% on dollars the bracket table prices at 22. It’s the same phantom-rate physics as the Social Security torpedo, in a gentler dose — and the two bands can overlap.
The window inside the window: this deduction expires after 2028. For anyone weighing multi-year conversion sequencing, 2025–2028 are years where staying under the phaseout thresholds carries a bonus that later years won’t offer — a fact worth knowing, whichever way your numbers point. Our calculator models the phaseout directly.
The deduction reduces taxable income — not adjusted gross income. That single technical fact means it does nothing for the two retirement thresholds built from AGI:
So a retiree can hold the full deduction and still be paying tax on 85% of their benefits and a Medicare surcharge. The deduction lowers the bill at the bottom of the return; the thresholds that dominate retirement tax planning are all decided higher up the page. Where your income sits against all three lines at once — brackets, torpedo band, phaseout band — is what the guide walks and the calculator computes.
Anyone 65 or older by the end of the tax year, for tax years 2025 through 2028, with a valid Social Security number. It’s up to $6,000 per qualifying person — up to $12,000 for a married couple where both spouses are 65 or older — and it phases out at higher incomes.
Yes. Unlike most deductions, it’s available whether you take the standard deduction or itemize, and it stacks on top of both the regular standard deduction and the existing additional deduction for those 65 and older.
No to both. The deduction reduces taxable income, not adjusted gross income. IRMAA is based on MAGI and the Social Security taxation formula is based on combined income — both are built from AGI, so neither one moves. A conversion that raises AGI still raises both, deduction or not.
After tax year 2028, unless Congress extends it. It applies to tax years 2025, 2026, 2027, and 2028.
Your brackets, your torpedo zone, your phaseout — free, in about 3 minutes.
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