Home Calculators Reverse Tax Calculator

Reverse Tax Calculator

Work backwards from a tax-inclusive price to find the original pre-tax amount. Supports VAT, GST, sales tax, and multiple stacked rates with a full price breakdown.

Pre-tax = Total ÷ (1 + rate)  •  Works for VAT, GST, HST, Sales Tax & custom rates

Price & Tax Inputs

Enter the final price you paid (tax included) and the tax rate(s)

$

Summary

Tax Rate
—
Pre-tax
Tax
Pre-tax Price —
Tax Amount —
Total (incl. tax) —

Details

Effective Rate—
Tax Multiplier—
Tax as % of Total—
Direction—

Quick Reference

Reverse (total → pre-tax): Pre-tax = Total / (1 + r) Tax = Total - Pre-tax Forward (pre-tax → total): Total = Pre-tax × (1 + r) Tax = Pre-tax × r