Sales Tax Calculator - Calculate Sales Tax Online

Sales Tax Formula

The formula for calculating sales tax is:

Sales Tax Amount = Before Tax Price × (Sales Tax Rate ÷ 100)
After Tax Price = Before Tax Price + Sales Tax Amount
        

If you know After Tax Price and Sales Tax Rate:

Before Tax Price = After Tax Price ÷ (1 + Sales Tax Rate ÷ 100)
Sales Tax Amount = After Tax Price - Before Tax Price
        

Reference

For official sales tax rates in the United States, please visit the U.S. government tax information at https://www.usa.gov/taxes .