Social Security Taxable Benefits Calculator

How this calculator works

Provisional income combines other worksheet income, relevant tax-exempt interest and half of net Social Security benefits. For supported single filers, the inclusion thresholds are $25,000 and $34,000; jointly they are $32,000 and $44,000. The first interval can include up to half of benefits. Above the second threshold, the worksheet can include up to 85%, subject to its capped formula. The result is an income inclusion amount; apply income-tax rules separately to determine tax owed.

Formula and rules

Provisional income = other worksheet income + tax-exempt interest + 50% of net benefits. Above the upper threshold: taxable benefits = min(85% of benefits, 85% of excess + min(50% of benefits, 50% of threshold interval)).

Assumptions and limitations

Single or married filing jointly, with positive net benefits and other worksheet income already established. No married-separate rules, lump-sum election, foreign income exclusions, railroad benefit treatment, negative benefit adjustments or automatic tax-return deduction/credit reconstruction.

Worked example

A single filer with $24,000 benefits and $25,000 other worksheet income has $37,000 provisional income. The taxable portion is $4,500 plus 85% of the $3,000 above $34,000, totaling $7,050.

Estimated taxable Social Security benefits

$7,050.00

Benefits outside federal taxable-income base

$16,950.00

Provisional income

$37,000.00

Share of benefits included in taxable income

29.38%

Official sources and review

Reviewed against the sources below on 2026-10-07. Rates are held in versioned rule modules. Versioned rules, official source review and year-specific calculation tests.

• IRS Publication 915 ↗

  Federal taxable Social Security worksheet; up to 85% inclusion is not an 85% tax rate.

Common questions