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Money — Sales Tax
Reverse Sales Tax Calculator
Enter a tax-inclusive total and your sales tax rate to split it into the price before tax and the tax amount.
Price before tax
—
The amount before sales tax was added.
| Sales tax amount | — |
|---|---|
| Tax rate | — |
| Total paid | — |
Show our math
Enter your figures above to see the step-by-step working.
Backs the tax out of a tax-inclusive totalEverything computed client-side — nothing leaves this page
How the Reverse Sales Tax Calculator Works
When you only know the final price with tax already included, you can work backwards to the original price. Because the total is the pre-tax price times one plus the tax rate, dividing the total by one plus the rate recovers the pre-tax price. The tax itself is the difference.
This is handy for expense reports, bookkeeping and receipts that show only the tax-inclusive total. Enter the amount you paid and your sales tax rate to split it into the base price and the tax.
price before tax = total ÷ (1 + tax rate)
Frequently Asked Questions
How do I find the price before tax?
Divide the tax-inclusive total by one plus the tax rate as a decimal. From a $107 total at 7% tax, the pre-tax price is 107 ÷ 1.07 = $100, so the tax was $7.
Why can’t I just subtract the tax percentage from the total?
Because the tax was charged on the smaller pre-tax price, not on the total. Subtracting 7% of the total would overstate the base price. You have to divide by 1 plus the rate instead.
Where do I find my sales tax rate?
It is the combined state and local rate for where the purchase was made, usually shown on the receipt. Enter that full combined percentage for an accurate split.
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