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To find a sales tax rate, you need the pre-tax subtotal as well as the tax-inclusive total. Subtract the subtotal from the total, divide the tax by the subtotal, then multiply by 100: Sales tax percentage = ((total − pre-tax subtotal) ÷ pre-tax subtotal) × 100.
Calculate the rate when you know the subtotal and total
- Find the tax amount: subtract the pre-tax subtotal from the final total.
- Divide the tax by the pre-tax subtotal. Use the pre-tax amount—not the final total—as the denominator.
- Multiply by 100 to express the result as a percentage.
For example, if a $100 subtotal becomes a $107.25 total, the tax is $7.25. Divide $7.25 by $100 and multiply by 100: the sales tax rate is 7.25%.
Dividing the tax by the tax-inclusive total instead gives the tax as a share of the amount paid, not the rate applied to the pre-tax price.
Remove tax from a total when you know the rate
If you already know the applicable tax rate, convert it to a decimal and divide the inclusive total by one plus that decimal:
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Pre-tax price = tax-inclusive total ÷ (1 + rate as a decimal)
Tax included = tax-inclusive total − pre-tax price
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For example, the Texas Comptroller of Public Accounts illustrates a $20 Austin T-shirt price that includes an 8.25% rate. The pre-tax price is $20 ÷ 1.0825 = $18.48, and the tax included is $20 − $18.48 = $1.52. See the Comptroller’s sales and use tax FAQ.
Why the total alone cannot reveal the rate
A grand total does not identify either the pre-tax base or the tax amount. Different combinations of prices and rates can produce the same total. To calculate a rate, you need the pre-tax subtotal and either the final total or the tax listed on the receipt. To split an inclusive total into price and tax, you need the applicable rate. ReverseSalesTax.com’s explanation also distinguishes these calculation paths.
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Check the receipt and the applicable tax rules
A receipt-wide calculation may not show one simple rate if the purchase includes fees, discounts, taxable and exempt items, or items taxed at different rates. The arithmetic can calculate a rate from the figures you provide, but it cannot determine which items are taxable or which jurisdiction’s rate applies. Check the relevant official tax authority for those rules.
Rounding depends on the jurisdiction
Rounding procedures are not necessarily universal. The Texas Comptroller instructs sellers to calculate tax to the third decimal place and round to the next cent when that digit is five or more. Under that Texas guidance, an $8.25% calculation on a $250 taxable sale gives $20.625 in tax, rounded to $20.63. Apply the rules for the relevant jurisdiction rather than assuming Texas’s method applies elsewhere.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
