How to use the senior deduction calculator
- Pick the tax year and your filing status. Married couples must file jointly to claim the deduction.
- Enter your modified adjusted gross income (MAGI). For most people that is the adjusted gross income on 2025 Form 1040, line 11a, which includes the taxable part of Social Security benefits.
- Tick who was 65 or older by December 31. For 2025 that means born before January 2, 1961; for 2026, before January 2, 1962.
- Read the deduction and the estimated tax saving, then the phase-out table for your income and how to claim it.
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How the senior deduction works
Pub. L. 119-21, signed on July 4, 2025, added a deduction of $6,000 for each taxpayer who is 65 or older by the end of the year, for tax years 2025 through 2028 (section 151(d)(5)(C) of the tax code). On a joint return where both spouses are 65 or older, that is up to $12,000. You get it whether you take the standard deduction or itemize, and you don’t need to be receiving Social Security.
It phases out with income: each person’s $6,000 is reduced by 6% of MAGI over $75,000, or over $150,000 on a joint return. A single filer with $100,000 of MAGI keeps $4,500; a couple with $180,000 keeps $4,200 each, $8,400 together. It is gone at $175,000 for a single filer and $250,000 for a couple. The amounts and thresholds are fixed in the law and aren’t adjusted for inflation.
Each person counted needs a Social Security number valid for work on the return. Married filing separately rules it out. Someone born before the cutoff who died during the year before reaching 65 doesn’t qualify; the IRS counts you as 65 on the day before your 65th birthday.
Not the same as the extra standard deduction
People 65 and older already got a bigger standard deduction, and they still do: for 2025, $2,000 more for a single filer or head of household and $1,600 for each married person; for 2026, $2,050 and $1,650. The senior deduction comes on top of that, on Schedule 1-A, and it isn’t limited to people who take the standard deduction. The calculator shows the extra standard deduction for age next to the result, and uses it when it estimates your taxable income.
Calling it “no tax on Social Security” is not quite right: benefits are taxed as before, under the same rules. The deduction lowers your taxable income, which lowers the tax on everything, benefits included.
Reading the estimated saving
The saving is an estimate at the federal brackets for the year: taxable income is MAGI minus the standard deduction (with the extra amount for age), unless you enter your taxable income or pick a bracket. If the standard deduction already covers all your income, the calculator says so: the deduction then wouldn’t lower your tax.
On Medicare? The IRMAA calculator shows whether your income puts a surcharge on Part B and Part D (the senior deduction doesn’t lower the MAGI Medicare uses, which starts from AGI), and the Social Security COLA calculator shows next year’s benefit after the raise and premiums.
Sources, checked October 18, 2026: Pub. L. 119-21, section 70103 (IRC section 151(d)(5)(C)); IRS, 2025 Schedule 1-A (Form 1040), Part V, and its instructions in the 2025 Form 1040 instructions; IRS, FS-2025-03; standard deductions and brackets: Rev. Proc. 2025-32 (2026) and the 2025 Form 1040 instructions.