Taxable Social Security Calculator — How Much Is Taxed? (2026)
How much of your Social Security is taxable? The IRS Publication 915 worksheet, your 2026 federal tax, and the real cost of your next $1,000 of income (the tax torpedo).
The yearly total: monthly benefit × 12, or box 5 of your Form SSA-1099.
Pensions, IRA and 401(k) withdrawals, wages, interest, dividends and gains: your adjusted gross income without Social Security.
Municipal-bond interest isn't taxed itself, but the IRS counts it when deciding how much of your benefits are taxable.
Age only affects the tax estimate (the extra standard deduction and the senior deduction), not how much of your benefits are taxable.
Taxable part of your benefits
$18,100
of your $30,000 in benefits — 60.3% — counts as taxable income.
Your provisional income is above $34,000, so up to 85% of your benefits can be taxable, and it is still climbing.
How the IRS worksheet gets there
Compared with $25,000 (nothing taxable at or below) and $34,000 (up to 85% above). These amounts are fixed in the tax code and aren't adjusted for inflation. Taxable benefits: $18,100, never more than 85% of benefits.
Estimated 2026 federal income tax
What your next $1,000 of income really costs
$222 in federal tax (22.2%)
Your bracket says 12%, but an extra $1,000 of income (an IRA withdrawal, say) also makes $850 more of your benefits taxable, so $1,850 gets taxed, not $1,000. That is the “tax torpedo.”
Your benefits become more taxable as other income rises from about $10,000 to about $43,706. Over that stretch the real rate on each extra $1,000 reaches 22.2%.
Show the numbers as a table
| Other income | Taxable benefits | Share of benefits | Tax bracket | Real rate, next $1,000 |
|---|---|---|---|---|
| $0 | $0 | 0% | 0% | 0% |
| $5,000 | $0 | 0% | 0% | 0% |
| $10,000 | $0 | 0% | 0% | 0% |
| $15,000 | $2,500 | 8.3% | 0% | 0% |
| $20,000 | $5,350 | 17.8% | 10% | 18.5% |
| $25,000 | $9,600 | 32% | 10% | 18.5% |
| $30,000 | $13,850 | 46.2% | 12% | 22.2% |
| $35,000 | $18,100 | 60.3% | 12% | 22.2% |
| $40,000 | $22,350 | 74.5% | 12% | 22.2% |
| $45,000 | $25,500 | 85% | 12% | 12% |
| $50,000 | $25,500 | 85% | 22% | 23.3% |
| $55,000 | $25,500 | 85% | 22% | 23.3% |
Estimate only. The taxable-benefits calculation follows IRS Publication 915 (2025) Worksheet 1 line by line; the tax estimate uses the 2026 federal brackets, standard deduction, extra standard deduction for age 65+ and the senior deduction from the One Big Beautiful Bill Act (which applies to tax years 2025–2028). Not financial or tax advice; confirm your own figures with your tax return or a tax professional.
Frequently asked questions
Q.How much of my Social Security is taxable?
It depends on your "provisional income": half of your Social Security benefits plus all of your other income, including tax-exempt interest. For a single filer or head of household, none of the benefits are taxable at or below $25,000, up to 50% can be taxable between $25,000 and $34,000, and up to 85% above $34,000. For a married couple filing jointly the two thresholds are $32,000 and $44,000. No more than 85% of your benefits is ever taxable (IRS Publication 915).
"85% taxable" doesn't mean an 85% tax rate. It means up to 85% of the benefit is added to your income and then taxed at your ordinary rates, after your deductions.
Q.What is the Social Security “tax torpedo”?
Inside the range where your benefits are becoming taxable, each extra dollar of income is taxed twice over: once as the dollar itself, and again because it pulls more of your benefits into taxable income. In the 85% range, $1,000 more income makes $850 more benefits taxable, so $1,850 is taxed and your real rate is your bracket rate × 1.85; in the 50% range, $1,000 makes $500 more taxable and the multiplier is 1.5. It stops once the 85% ceiling is reached.
Example from this calculator: a single filer aged 65+ with $30,000 of benefits and $35,000 of other income has $18,100 of benefits taxable. The 12% bracket applies, but the next $1,000 (an IRA withdrawal, say) makes $850 more of the benefits taxable and costs $222 in federal tax, or 22.2%. The chart above shows this for your own numbers. This is a description of how the rules interact, not a recommendation about what to do.
Q.Are the $25,000 and $34,000 thresholds adjusted for inflation?
No. They are fixed dollar amounts written into the statute (26 U.S.C. § 86(c)), and the section contains no inflation adjustment, unlike tax brackets and standard deductions, which the IRS updates each year. That is why Publication 915 for 2025 and this calculator for 2026 use the same figures.
Q.Which income counts, and what can’t I subtract?
Publication 915 compares the base amount with half of your benefits plus all your other income, including tax-exempt interest. When you make that comparison you must not reduce your other income by certain exclusions: interest from qualified U.S. savings bonds, employer-provided adoption benefits, interest on education loans, foreign earned income or housing, and income earned by bona fide residents of American Samoa or Puerto Rico. This calculator asks for your income already net of ordinary adjustments (that is, your adjusted gross income without Social Security), so it does not handle those exclusions for you.
Q.What if I’m married and file separately?
If you file separately and lived with your spouse at any time during the year, your base amount is $0, so up to 85% of your benefits are taxable from the first dollar. Publication 915 Example 4 shows a filer with $8,000 of earnings and $4,000 of benefits who must include $3,400 (85%). If you lived apart from your spouse all year, the single-filer amounts apply. This calculator doesn't model married filing separately.
Q.Why might my tax software give a different answer?
Common reasons: you have qualified dividends or long-term capital gains (they count toward provisional income, but this calculator taxes them at ordinary rates, which overstates the tax estimate; the taxable-benefits figure is still right); you contribute to a traditional IRA and are covered by a workplace plan, which the IRS says needs different worksheets (Publication 590-A); you received a lump-sum payment for an earlier year; you live in a state that taxes benefits; or your deductions differ from the standard deduction assumed here.
Q.Does the senior deduction last?
The tax estimate includes the new $6,000 deduction for each person aged 65 or older. Each person's $6,000 is reduced by 6% of income above $75,000 (single) or $150,000 (joint), so it is gone entirely at $175,000 or $250,000. It applies to tax years beginning before 2029 (26 U.S.C. § 151(d)(5)(C); IRS Schedule 1-A), so without it the estimate would be higher for the same income.
Sources
- IRS Publication 915 (2025) — Social Security and Equivalent Railroad Retirement Benefits (base amounts, Worksheet 1, worked examples)
- 26 U.S. Code § 86 — Social security and tier 1 railroad retirement benefits (the statute)
- IRS Revenue Procedure 2025-32 — 2026 tax brackets, standard deduction and the extra deduction for age 65+ (sections 3.01, 3.14)
- IRS Schedule 1-A (Form 1040) — the senior deduction and its phase-out