Taxable Social Security Benefits Calculator

Find how much of your Social Security is taxable using the IRS provisional income test.

Written by Jude Ramsey · Last updated August 2026 · How these calculators are checked

How taxable social security benefits is worked out

Social Security is not automatically taxable. The IRS computes provisional income — your other income plus tax-exempt interest plus half your benefits — and compares it to two thresholds. Below the first, nothing is taxable; above the second, up to 85% is.

The 85% figure is a ceiling on how much of the benefit enters your taxable income, not a tax rate. The actual tax depends on your bracket, which is why the calculator applies your marginal rate separately.

How to fill it in

Enter your annual Social Security benefits.
Enter your other income and any tax-exempt interest.
Choose your filing status and marginal rate.

The maths behind it

provisional income = other income + tax-exempt interest + 50% of benefits single: $25,000 and $34,000 · married filing jointly: $32,000 and $44,000 maximum taxable share of benefits: 85%

A worked example

Take the starting scenario, a marginal tax rate of 12%. That gives a taxable benefits of $11,300. Underneath, Provisional income comes out at $42,000 and First threshold at $25,000 — exceeded. Change any field and every figure updates as you type.

Common questions

Is Social Security always taxed?

No. Retirees whose provisional income stays below $25,000 single or $32,000 jointly pay no federal tax on benefits.

What does 85% taxable mean?

That up to 85% of your benefit amount is added to taxable income. It is not an 85% tax — the tax depends on your bracket.

Do states tax Social Security?

Most do not, but a handful still do. Check your state rules separately.