Taxable Income Calculator

Before any tax bracket comes into play, the IRS needs one number: your taxable income. This taxable income calculator walks through exactly how your gross income gets reduced step by step until it reaches the figure that's actually taxed — and then shows you the resulting federal tax.

The Three Numbers That Matter

There's a clear chain: gross income is everything you earn. Adjusted income is gross income minus pre-tax contributions such as a traditional 401(k) or HSA. Taxable income is adjusted income minus your deduction — either the standard deduction for your filing status, or your itemized total if that's higher. The calculator above shows all three side by side as you adjust the inputs.

Why Pre-Tax Deductions Come First

Contributions to a traditional 401(k), 403(b), or HSA are subtracted from your income before the standard deduction is even applied. That's why increasing a 401(k) contribution lowers your taxable income dollar-for-dollar — it's not just "saving for retirement," it's actively shrinking the income the IRS taxes this year.

Standard Deduction Amounts by Filing Status

For the 2025 tax year, the standard deduction is $15,750 for single filers and those married filing separately, $31,500 for married couples filing jointly, and $23,625 for head of household. These amounts increase for 2026 to $16,100, $32,200, and $24,150. Switching the filing status and tax year in the calculator updates the deduction automatically.

From Taxable Income to Tax Owed

Once taxable income is known, it's run through the progressive federal brackets to produce your total tax. If you want to see that bracket-by-bracket breakdown in detail, head over to our tax bracket calculator, which uses the same taxable income figure calculated here.