Reverse Sales Tax Calculator

Enter the total paid and tax rate to reverse the tax-inclusive price into before-tax price and tax amount.

Total paid including tax

Sales tax rate %

—Before-tax price

—Tax amount

—Tax factor

—Rate

Reverse a known rate mathematically

This is an arithmetic back-calculation from a tax-inclusive total. It does not discover which jurisdiction or product tax rule applied.

How to use the Reverse Sales Tax Calculator

Enter the total paid and the sales tax percentage. The tool divides the tax-inclusive total by 1 + rate to estimate the original before-tax price, then reports the tax amount.

What the result means

This is a mathematical reverse calculation for a known rate.

Practical tips and limits

Use the rate that actually applied to the transaction. Product exemptions, destination sourcing, multiple jurisdictions, and rounding rules can change a real receipt.