Free Retail Tool

US Sales Tax Calculator

Add or remove US sales tax in seconds. Pick your state to load its base rate, or enter your exact combined rate — free, no signup, built by RetaPOS.

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Statewide base rate loads from your state. Local city/county tax may add more — edit the rate for your exact location.

Price before tax —
Sales tax —
Total with tax —

How to calculate US sales tax

To add sales tax, multiply the price by the tax rate and add it to the price: a $100 sale at 8.25% is $8.25 tax, for a $108.25 total. To find the pre-tax price from a tax-inclusive total, divide the total by 1 plus the rate as a decimal: $108.25 ÷ 1.0825 = $100.00.

Sales tax = Price × (Rate ÷ 100)
Total = Price + Sales tax

US sales tax is set at the state level, and most states let counties and cities add local tax on top — so two stores in the same state can charge different combined rates. RetaPOS applies the correct sales tax automatically at billing for every US store and reports it for filing, on your phone. Requires a Wi-Fi or 4G/5G connection.

Frequently asked questions

Multiply the pre-tax price by the sales tax rate as a decimal, then add it to the price. A $50 item at a 7% rate has $3.50 tax and a $53.50 total. Use the calculator above to do this instantly for any US state, or enter your exact combined rate.

Five states have no statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. Note that some Alaska localities still charge a local sales tax. Selecting one of these states loads a 0% base rate in the calculator.

Divide the tax-inclusive total by 1 plus the rate as a decimal. For a $108.25 total at 8.25%: $108.25 ÷ 1.0825 = $100 pre-tax, so the tax was $8.25. Switch the calculator to “Remove sales tax” to do this automatically.

The state dropdown loads the statewide base rate only. Most US counties and cities add local sales tax on top, so your combined rate is often higher. Enter your exact combined rate in the rate field for an accurate result. RetaPOS handles this automatically per store location.

Automatic sales tax for your US store

RetaPOS applies the right sales tax at billing, tracks it, and reports it for filing — a mobile-first POS for small US retail from US$399/year. Requires a Wi-Fi or 4G/5G connection.

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