How Much of My Social Security Is Taxable?
Between 0% and 85% of your Social Security benefits can be subject to federal income tax — never more than 85%, no matter how much you earn. Which tier you land in depends on your combined income (the IRS also calls it provisional income): your adjusted gross income excluding Social Security, plus any tax-exempt municipal bond interest, plus half of your annual Social Security benefits.
For single filers: combined income under $25,000 means 0% taxable; between $25,000 and $34,000, up to 50% is taxable; above $34,000, up to 85%. For married filing jointly: the thresholds are $32,000 and $44,000. These thresholds were set in 1984/1993 and are not indexed for inflation, which is why more retirees owe tax on benefits every year.
How to Use This Calculator
Enter your annual Social Security benefits (Box 5 of your SSA-1099), your other income (pensions, IRA and 401(k) withdrawals, wages, interest, dividends, capital gains), any tax-exempt interest, and your filing status. The calculator runs the exact IRS worksheet math and shows your taxable amount, the percentage of benefits taxed, and a rough federal tax estimate at your marginal rate.
The Exact IRS Formula
If combined income exceeds the upper threshold, taxable benefits = the lesser of: 85% of the amount over the upper threshold plus the smaller of (50% of the gap between thresholds) or (50% of benefits) — or 85% of total benefits. If you are between the thresholds, it is the lesser of 50% of the excess over the base or 50% of benefits.
Worked example: A single retiree receives $28,000 in Social Security and withdraws $30,000 from an IRA. Combined income = $30,000 + $14,000 = $44,000 — above the $34,000 upper threshold. Taxable = min(0.85 × $10,000 + $4,500, 0.85 × $28,000) = min($13,000, $23,800) = $13,000, about 46% of benefits. At a 12% rate, that is roughly $1,560 of federal tax.
How to Reduce Taxes on Your Social Security
The lever is combined income. Strategies that lower it: take Roth withdrawals instead of traditional IRA withdrawals (Roth distributions don't count toward combined income); use QCDs (qualified charitable distributions) after 70½ to satisfy RMDs without raising AGI; harvest capital losses; and be careful with municipal bonds — their interest is tax-exempt but still counts toward combined income. If you are 65+, the $6,000 OBBBA senior deduction (2025–2028) offsets much of the tax even when benefits are taxable.
Common Mistakes Retirees Make
First: believing the myth that Social Security is never taxed — most retirees with pension or IRA income owe something. Second: forgetting that tax-exempt interest counts toward combined income. Third: taking one large IRA withdrawal that spikes combined income into the 85% tier when two smaller withdrawals across years would stay at 50%. Fourth: confusing the OBBBA senior deduction with a change to these rules — the 0/50/85% tiers still apply; the deduction just offsets the resulting tax. Fifth: ignoring withholding — you can file Form W-4V to have tax withheld from benefits and avoid a surprise bill.
Frequently Asked Questions
How much of my Social Security is taxable in 2026?
Between 0% and 85%, based on combined income (other income + tax-exempt interest + half your benefits). Single: 0% under $25,000, up to 50% between $25,000–$34,000, up to 85% above $34,000. Married filing jointly: $32,000 and $44,000.
What is combined income for Social Security?
Your adjusted gross income excluding Social Security, plus tax-exempt interest, plus 50% of your annual Social Security benefits. The IRS also calls it provisional income.
Is Social Security ever 100% taxable?
No. Federal law caps the taxable portion at 85% of benefits — at least 15% is always tax-free.
Did OBBBA make Social Security tax-free?
No. The 0/50/85% rules are unchanged. OBBBA added a separate $6,000 senior deduction (2025–2028) for taxpayers 65+, which offsets much of the tax for typical retirees.
Do states tax Social Security benefits?
Most states do not. A small number tax benefits partially, generally with exemptions that shield lower and middle incomes — check your state's current rules.
Related Calculators
- Senior Tax Deduction Calculator — The $6,000 OBBBA bonus deduction for 65+.
- Retirement Savings Calculator — Project your withdrawals and income.
- 401(k) Retirement Calculator — Grow your balance with employer match.