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Income Tax Calculator – Estimates federal income tax owed using margina...

The Income Tax Calculator estimates federal income tax owed using marginal tax brackets. This free Income Tax Calculator gives you an instant, accurate result without requiring an account, spreadsheet, or financial expertise. Enter your numbers and see exactly what the formula produces.

The formula behind this calculator: Taxable income is taxed progressively, applying each bracket's rate only to the income within that bracket. As a practical example: $70,000 taxable income (single filer) lands mostly in the 22% bracket but the first portions are taxed at 10% and 12%. All results are calculated instantly in your browser — no data is stored or transmitted.

Income Tax Calculator FAQ

What does the Income Tax Calculator calculate?

Estimates federal income tax owed using marginal tax brackets.

How often should I recalculate as my situation changes?

Any time your rate, income, or financial goals change significantly. For mortgage planning, recalculate whenever rates move more than 0.25%.

What is the difference between fixed and variable rates?

Fixed rates stay constant for the loan term. Variable rates change with a benchmark rate (like SOFR), which can lower or raise your payment unpredictably.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.