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If married filing jointly, add both spouses' box 5 amounts.
Wages, pensions, IRA withdrawals, taxable interest and other income. Don't include Social Security.
Often 0. It's on Form 1099-INT box 8 if you have it.
How the test works
Add half of your Social Security benefits to all your other income, including tax-exempt interest. That is your combined income. If it's more than the base amount ($25,000 for single, head of household and qualifying surviving spouse, $32,000 married filing jointly, $0 married filing separately if you lived with your spouse at any time), part of your benefits may be taxable. Up to 85% can be taxable above $34,000 ($44,000 joint). Source: Publication 915 (tax year 2025).
Two extra deductions if you're 65 or older
Additional standard deduction: $2,050 if single or head of household ($1,650 for each married spouse) for tax year 2026 and $2,000 if single or head of household ($1,600 for each married spouse) for 2025. It's already built into the higher filing threshold for people 65 and older.
Senior deduction: up to $6,000 per person 65 or older for tax years 2025 through 2028, whether you itemize or not. It's reduced by 6% of modified AGI over $75,000 ($150,000 married filing jointly), needs a valid Social Security number, and married couples must file jointly to claim it. It lowers taxable income but doesn't change whether you have to file.
Questions about your situation?
Book a free 15-minute call. Year-round help from the same team, and you can call us when an IRS letter shows up in July.
Free 15-minute callNot ready yet? Get a reminder in JanuaryOfficial sources: Publication 915, Social Security benefits (tax year 2025) ↗ · Form 1040 instructions (tax year 2025) ↗ · Rev. Proc. 2025-32 (tax year 2026) ↗ · Schedule 1-A, senior deduction (tax year 2025) ↗ · Schedule 1-A draft (tax year 2026) ↗
Figures checked on irs.gov in October 2026. General information only, not tax advice for your situation. Your situation is confirmed when we prepare your return.
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