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Sales Tax Reverse Calculator
Calculate the pre-tax subtotal and tax amount already included in a final, tax-inclusive total price.
How to Use Sales Tax Reverse Calculator
- 1Enter the final tax-inclusive total amount
- 2Enter the tax rate percentage that was applied
- 3Click Calculate to see the pre-tax subtotal and tax amount
Frequently Asked Questions
Sales Tax Calculator works subtotal → total (adds tax on top of a pre-tax price). This tool works the opposite direction — total → subtotal (extracts the tax already baked into a final price).
Because the tax rate applies to the pre-tax subtotal, not the tax-inclusive total — dividing correctly (total ÷ (1 + rate%)) recovers the subtotal first; multiplying the total directly would overstate the tax.
Common uses: a receipt only shows the final total and you need to know the pre-tax amount for expense reporting, or you want to verify a vendor's tax calculation on an invoice.
Yes — the same extraction formula applies regardless of what the tax is called, as long as you enter the correct tax rate.
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