Taxable Social Security Calculator
A single filer with $30,000 in combined income owes federal tax on $2,500 of Social Security — not a flat 50%. This calculator runs the exact IRS Publication 915 worksheet on your numbers to show the taxable amount, your tier, and how much income headroom you have before more of your benefit gets taxed.
Last updated September 15, 2026
If married filing jointly, enter both spouses' benefits combined.
Wages, pensions, IRA/401(k) withdrawals, taxable interest, dividends, capital gains — everything on your return besides Social Security.
E.g. municipal bond interest.
The combined income formula
The IRS determines how much of your Social Security benefit is taxable using a figure called combined income (also called provisional income), not your regular taxable income:
Combined income = Other taxable income + Tax-exempt interest + 50% of your annual Social Security benefits
That number is then compared against base amounts that vary by filing status. The full mechanics, including what counts as “other income” and what doesn't, are covered in how to calculate combined income. This tool implements IRS Publication 915, Worksheet 1 (Figuring Your Taxable Benefits) line by line, including the $4,500/$6,000 caps in the 85% tier that simpler “50% or 85%” explanations skip.
Thresholds by filing status (2026)
These base amounts are set by 26 U.S.C. § 86 and have not been adjusted for inflation since 1984 (1993 for the second threshold) — confirmed in the SSA's benefits-taxation guidance.
| Filing status | 0% tier | Up to 50% tier | Up to 85% tier |
|---|---|---|---|
| Single / Head of household / Qualifying surviving spouse | Under $25,000 | $25,000 – $34,000 | Over $34,000 |
| Married filing jointly | Under $32,000 | $32,000 – $44,000 | Over $44,000 |
| Married filing separately, lived apart all year | Under $25,000 | $25,000 – $34,000 | Over $34,000 |
| Married filing separately, lived with spouse at any time | — | — | From $0 (up to 85% applies immediately) |
Worked examples
These examples are computed with the same worksheet logic as the calculator above — not a rounded “50% or 85% flat” approximation.
Example 1 — Single filer, in the 50% tier. $18,000/year in Social Security (half = $9,000) plus $21,000 in other income = $30,000 combined income. That's $5,000 over the $25,000 base. The taxable amount is the lesser of 50% of the excess ($2,500) or 50% of benefits ($9,000) — so $2,500 is taxable, about 14% of the benefit.
Example 2 — Single filer, in the 85% tier. $20,000/year in Social Security (half = $10,000) plus $25,000 in other income = $35,000 combined income, $1,000 over the $34,000 second threshold. Running the full worksheet (not just “85% of benefits”) gives $5,350 taxable — about 27% of the benefit, far less than a rough 85% estimate would suggest.
Example 3 — Married filing jointly, in the 85% tier. $48,000/year combined Social Security (half = $24,000) plus $50,000 in other income = $74,000 combined income, $30,000 over the $44,000 second threshold. The worksheet caps the 50%-tier portion at $6,000 and adds 85% of the amount over $44,000, for $31,500 taxable — about 66% of the benefit, not the full 85%.
The Social Security tax torpedo
Because the 50% and 85% tiers apply to your Social Security on top of your other income, an extra dollar of IRA withdrawal or capital gains can pull 1.5–1.85 dollars into taxable income near the thresholds — a spike often called the Social Security tax torpedo. It can push your effective marginal tax rate well above your nominal bracket, which matters most for Roth conversion and withdrawal-sequencing decisions.
Withholding taxes from your benefit
If this calculator shows a meaningful taxable amount, you can avoid an April surprise by having federal tax withheld directly from your monthly check. File Form W-4V with the SSA to elect 7%, 10%, 12%, or 22% withholding — see Social Security tax withholding for the full walkthrough.
What this calculator does and doesn't do
This tool estimates the federal taxable amount of your Social Security benefit using the current IRS Pub. 915 worksheet. It does not calculate:
- Tax owed. The taxable amount is added to your other income and taxed at your marginal federal rate — this tool doesn't compute that final tax bill.
- State tax. A handful of states tax Social Security independently of federal rules. See which states don't tax Social Security.
- Lump-sum election method for benefits that include a back payment covering a prior year.
- Medicare IRMAA surcharges or other means-tested program effects of higher income.
For the full combined-income mechanics and coordination strategies across a household, see Social Security tax strategy and Roth conversion before claiming.
Frequently asked questions
What counts as “combined income” for Social Security taxes?
Combined income (also called provisional income) is your Adjusted Gross Income (excluding Social Security) plus any tax-exempt interest plus 50% of your annual Social Security benefits. It is not the same as your taxable income or your Social Security benefit amount — it is a separate figure the IRS uses only to determine how much of your benefit gets taxed. See our full walkthrough in how to calculate combined income.
Is my Social Security benefit ever completely tax-free?
Yes. If your combined income is below $25,000 (single, head of household, or qualifying surviving spouse) or $32,000 (married filing jointly), none of your Social Security benefit is federally taxable. Roughly 40% of Social Security recipients fall into this tier, typically those relying mainly on Social Security with little other income.
Can up to 85% of my benefits really be taxed?
Yes — 85% is the maximum share of your Social Security benefit that can ever be included in taxable income, no matter how high your other income is. It is never 100%, and the 85% applies to the benefit amount that becomes taxable income, not a tax rate on your check. Most retirees with a pension, meaningful IRA withdrawals, or a working spouse land in this tier.
Do the $25,000/$32,000 thresholds change every year?
No. Unlike most IRS thresholds, the Social Security taxation base amounts ($25,000, $32,000, $34,000, $44,000) are not adjusted for inflation. They have been fixed since 1984 (and 1993 for the 85% tier), which is why a growing share of retirees end up owing tax on their benefits over time as wages and other income rise.
How do I have taxes withheld from my Social Security check?
File Form W-4V (Voluntary Withholding Request) with the Social Security Administration to have 7%, 10%, 12%, or 22% withheld directly from your monthly benefit, similar to a paycheck. This avoids a surprise bill or underpayment penalty at tax time. See our guide to Social Security tax withholding for the full process.
Does my state also tax Social Security benefits?
This calculator estimates federal taxable amount only. A minority of states also tax Social Security benefits, though most exempt lower-income retirees and the trend has been toward elimination. Check the states that don't tax Social Security to see where your state stands.