Inkomstenbelasting calculator
The detailed guide below is currently available in English.
How marginal brackets work
U.S. federal income tax is progressive: your income is sliced into layers, and each layer is taxed at its own rate. Earning more never makes your whole income jump into a higher bracket — only the dollars above each threshold pay the higher rate. Your marginal rate is the rate on your last dollar; your effective rate is the blended average across all layers, and it is always lower.
What this estimate leaves out
- Credits such as the child tax credit or earned income credit, which cut tax dollar-for-dollar.
- Payroll taxes — Social Security and Medicare — which are separate from income tax.
- State and local income tax, itemized deductions, and preferential rates on capital gains and dividends.
Use the result as a planning figure, and have a qualified preparer review your actual return.
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Which year’s brackets does this use?
The 2025 federal brackets and standard deductions shown in the results table. Congress adjusts these figures most years for inflation, so revisit the estimate annually.
Should I enter my deductions?
If you itemize (mortgage interest, charitable gifts, state taxes above caps) and know the total, enter it. Otherwise leave the field blank to apply the standard deduction automatically.
Why is my effective rate lower than my bracket?
Because only your top slice of income is taxed at the marginal rate. Everything below each threshold is taxed at the lower bracket rates, which pulls the average down.