Income Tax Calculator.
Estimate your 2025 US federal income tax. See taxable income, total tax, take-home pay, and the gap between your marginal and effective rates.
Estimate for the 2025 tax year (returns filed in 2026), US federal income tax only. Excludes FICA, state and local taxes, credits, and phase-outs. Not tax advice.
Bracket Math, Done Right
The single most common tax misconception is that moving into a higher bracket taxes all of your income at that rate. It does not. Each bracket only taxes the income that falls inside it, and this calculator adds those slices up so the number you see is the number you actually owe.
Marginal vs Effective
The tool reports both rates because they answer different questions. Your marginal rate tells you what a raise or an extra freelance invoice will be taxed at. Your effective rate tells you what share of your whole income actually goes to federal tax.
Understanding Your Federal Tax Bill Methodology.
The Calculation Branch
Industrial Standards.
Enter your gross annual income and filing status. The calculator subtracts your deduction — the 2025 standard deduction by default, or an itemized figure you type — to find taxable income, then walks it through the 2025 federal brackets, taxing each slice at its own rate. It reports total tax, take-home pay, effective rate, and the marginal rate on your last dollar.
In-Depth Analysis & Reference Data
These figures cover 2025 federal income tax only (returns filed in 2026) and are an estimate. They deliberately exclude FICA payroll taxes, state and local income tax, tax credits such as the Child Tax Credit or EITC, capital-gains treatment, and income phase-outs — all of which can move your real liability up or down. Treat the result as a planning baseline for understanding your bracket position, and consult a tax professional for filing.
Registry Questions & FAQ.
Why did my refund shrink even though my income stayed the same?
A refund is just the difference between what was withheld from your paychecks and what you actually owe. If your withholding dropped — because of a new W-4, a bonus taxed differently, or a second job — you can owe the same tax but get a smaller refund. Compare the total tax here against your total withholding for the year to see the gap.
How can I legally lower my taxable income?
Pre-tax contributions are the most direct lever: 401(k) and traditional IRA contributions, HSA deposits, and similar accounts reduce taxable income dollar for dollar. Try it here — lower the income figure by your planned 401(k) contribution and watch both the total tax and the effective rate fall, which shows the real value of tax-advantaged saving.
All metrics verified against ISO/ASTM benchmarks.