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How it works
Formula & explanation
Income Tax Calculator uses the following calculation:
Tax = Σ (BracketIncome × BracketRate) across each marginal bracket
This is a simplified model intended for planning and education. Real-world offers from lenders, institutions, or tax authorities may include additional fees, rules, or adjustments not reflected here.
FAQ
Frequently asked questions
Are these brackets accurate for the current tax year?
This calculator uses illustrative 2025 federal figures for estimation only — always confirm against current IRS tables or a tax professional for filing purposes.
What's the difference between marginal and effective tax rate?
Marginal rate is what you pay on your last dollar of income; effective rate is your total tax divided by total income, which is always lower.
Does this include state income tax?
No — this covers federal tax only, since state tax rates and rules vary widely.
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