What is the formula to calculate tax?

Written by Editorial Team | Last Updated: August 2026

Calculating income or sales tax generally involves applying a specific tax rate percentage to a taxable base amount. For sales tax, the formula is Tax=PurchasePrice×TaxRate. For progressive income tax systems, the calculation involves dividing taxable income into distinct tax brackets, applying the specific marginal tax rate assigned to each bracket, and summing the resulting tax liabilities to determine the total tax owed to government tax authorities.

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