About Tax Calculator

U.S. federal income tax estimator using 2024 tax brackets for all four filing statuses: single, married filing jointly, married filing separately, and head of household. Computes federal income tax progressively across brackets, adds state income tax for all 50 states, and includes FICA (Social Security at 6.2% up to $160,200, Medicare at 1.45%, plus the 0.9% Additional Medicare Tax). Reports effective tax rate, marginal rate, and take-home pay. Supports standard and itemized deductions with age-based adjustments for filers 65+.

• 2024 federal brackets for all filing statuses, with progressive bracket-by-bracket breakdown
• State income tax rates for all 50 states, including the nine states with no income tax
• FICA calculation: Social Security (6.2% up to $160,200), Medicare (1.45%), Additional Medicare (0.9% above $200K/$250K)
• Standard deduction auto-applied by filing status; extra deduction for age 65+ ($1,550 single, $3,100 joint)
• Downloadable tax report as a formatted .txt file with full breakdown

Frequently Asked Questions

How accurate are the state tax calculations?

The tool uses a single flat rate per state, which is the top marginal rate. States with progressive brackets (like California and New York) will show slightly higher estimates than actual liability. Treat it as a quick approximation—use your state’s tax authority for precise numbers.

Does it include tax credits?

No. This calculator handles brackets, deductions, and FICA only. Credits like the Earned Income Tax Credit, Child Tax Credit, or education credits are not factored in.

What’s the difference between effective and marginal tax rate?

Marginal rate is the bracket your last dollar of income falls into. Effective rate is your total tax divided by gross income—the actual percentage you pay overall. The effective rate is always lower than the marginal rate because of progressive taxation.