US Federal Income Tax Calculator
Calculate US federal income tax online for free using 2025 tax brackets. Enter your taxable income and filing status to see your tax, effective rate and bracket. Runs entirely in your browser — nothing you enter is uploaded.
Uses 2025 tax-year federal brackets (already applied after your standard deduction — enter taxable income, not gross). Always verify current brackets at irs.gov.
How to use us federal income tax calculator
- Enter your taxable income
After deductions — not your gross salary.
- Choose your filing status
Single or married filing jointly.
- Calculate
See your federal tax, effective rate and top marginal bracket.
Features
Rates and thresholds are inputs you can change, not hidden constants.
Calculates locally with no sign-up or server request.
Your financial details are never uploaded.
Supported formats and limitations
Text and structured input supported by this tool.
Use cases include personal workflows, content preparation, and quick checks. Review output before relying on it for legal, financial, accessibility, or production decisions.
Frequently asked questions
What tax year does this use?
2025 federal brackets. Brackets are adjusted annually for inflation — always check irs.gov for the current year before relying on this for a real filing.
Does this include state income tax?
No — only federal. State income tax rules vary enormously (some states have none); use the Paycheck Calculator if you want a state-tax estimate included.