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How to Calculate Income Tax

Estimate your US federal income tax with 2026 brackets.

The Formula

Progressive tax brackets

The income tax formula uses the mathematical relationship: Progressive tax brackets. Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the income tax calculation.
  2. 2Substitute your known values into the formula: Progressive tax brackets.
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Income Tax Calculator to confirm your answer.

Related Topics

income taxfederal taxtax brackets

Use the Interactive Calculator

Skip the manual math — get instant results with our free Income Tax calculator.

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