Social Security Tax Calculator
Up to 85% of your Social Security benefit can be taxable — or none of it, depending on your other income. This calculator works out your provisional income and the exact taxable portion for 2026.
How this calculator works
Your provisional income is your adjusted gross income plus tax-exempt interest plus half your Social Security benefits. For a single filer, benefits start becoming taxable above $25,000 of provisional income; above $34,000, up to 85% is taxable. Married joint thresholds are $32,000 and $44,000. The calculator applies the tiered formula and shows the dollar amount added to your taxable income.
Frequently asked questions
Why is Social Security income taxed?
Since 1983, up to 85% of benefits can be taxed, but the thresholds ($25,000/$34,000 single, $32,000/$44,000 joint) were set in 1993 and were never indexed for inflation. As a result, the share of beneficiaries paying tax on benefits has grown over time.
How much of my benefit is never taxed?
At least 15% of your benefit is never taxable, because the maximum taxable share is 85%. If your provisional income stays under the lower threshold, the full benefit is tax-free. Between the thresholds, the taxable share steps up in 50-cent increments per extra dollar of provisional income.
Can I reduce the tax on my benefits?
Yes — the biggest levers are Roth accounts (Roth IRA and Roth 401(k) withdrawals are not part of AGI and do not count toward provisional income) and delaying or reducing taxable IRA withdrawals until the brackets work in your favor. Qualified charitable distributions from an IRA also lower AGI while satisfying your RMD.
Disclaimer: Results are estimates for general information only and do not constitute financial, tax, or legal advice. Figures reflect 2026 rules and may change. Always confirm current limits and consult a qualified professional before making decisions. Official figures: IRS.gov · 2026 limits per IRS tax inflation adjustments.