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A reverse sales tax calculator finds the pre-tax price when you know the total amount paid (including tax) and the tax rate. If you paid $108 with 8% tax, the original price was $108 / 1.08 = $100.

Trin-for-trin guide

1. 1Pre-tax price = Total price / (1 + tax rate)
2. 2Tax amount = Total price − Pre-tax price
3. 3Or: Tax amount = Total price × (tax rate / (1 + tax rate))
4. 4Example: $108 total, 8% tax: $108 / 1.08 = $100 pre-tax

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