Calculateur de tranches d'imposition

À PROPOS DE CET OUTIL

Enter your 2025 filing status and taxable income to see how the US federal income tax system applies different rates to different slices of your income, rather than one flat rate to the whole amount. The result breaks down exactly how much of your income falls into each bracket and what you owe at each level, then combines those into a total tax bill and an effective (average) tax rate. This is the calculation many people misunderstand — moving into a higher bracket doesn't mean all your income gets taxed at the higher rate, only the portion above that threshold. Useful for estimating your tax bill before filing, adjusting paycheck withholding, or understanding a raise's real after-tax impact.

COMMENT UTILISER

1. Select your filing status (single, married filing jointly, etc.).
2. Enter your taxable income for the year, not your gross income.
3. Review the breakdown showing how much is taxed in each bracket.
4. Check the total estimated tax and your effective tax rate.
5. Adjust the income figure to see how a raise or deduction changes your bracket.

CAS D'USAGE COURANTS

• A freelancer estimating quarterly taxes owed based on projected annual income.
• An employee deciding whether to increase 401(k) contributions to lower taxable income.
• Someone evaluating whether a raise or bonus will push their whole income into a higher rate — it won't.
• A newly married couple comparing their combined tax bill filing jointly.
• Someone checking paycheck withholding against an estimated annual tax bill to avoid a surprise at filing time.

CONSEILS ET ERREURS COURANTES

• Taxable income is not the same as gross income — deductions (standard or itemized) and pre-tax contributions reduce it first.
• Moving into a higher bracket only raises the rate on income above that bracket's threshold, not your entire income.
• Your effective tax rate (total tax divided by income) is always lower than your top marginal bracket, since lower brackets are taxed at lower rates first.
• This estimates federal income tax only — state income tax, FICA/payroll tax, and local taxes are calculated separately and aren't included here.

AUTRES QUESTIONS

What's the difference between my marginal rate and my effective rate?

Your marginal rate is the rate applied to your last dollar of income — the bracket you're 'in.' Your effective rate is your total tax divided by your total taxable income, which averages in the lower rates paid on earlier portions of income, so it's always lower than your marginal rate.

Does this calculator include payroll taxes like Social Security and Medicare?

No. It estimates federal income tax only. Payroll taxes (FICA) are calculated separately with their own rates and wage limits, and aren't part of the income tax bracket system shown here.

Why is taxable income different from my salary?

Your taxable income is your gross income minus adjustments like the standard or itemized deduction and certain pre-tax contributions (e.g., traditional 401(k) or HSA). That's the figure the bracket calculation actually uses, not your total salary.

Will a bonus push my entire paycheck into a higher bracket?

No individual payment gets special treatment in your annual bracket calculation — at tax time, all income is combined and only the amount above a bracket threshold is taxed at that bracket's rate. A bonus might be withheld at a flat rate during the year, but your actual liability is settled based on total annual income.

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