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ZipNumbers

Sales tax tools

Everything runs in your browser — nothing is uploaded, no sign-up, no rate limits. Each tool uses the same arithmetic as the calculator on every city page.

Quick answer

To reverse sales tax out of a total, divide the total by one plus the rate as a decimal: a $108.25 receipt at 8.25% is $108.25 ÷ 1.0825 = $100.00 pre-tax, with $8.25 in tax.

All tools

Free, no account, works offline once loaded.

Sources & transparency

Calculators run entirely client-side. Default rates you may pull in from a city page come from the source below.

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.