Add or remove a combined state and local US sales tax rate
Use the applicable combined rate
US sales tax can include state, county, city, and special-district components. This calculator does not derive a rate from an address: enter the combined rate that applies to the transaction.
Add tax or remove included tax
Add mode multiplies the pre-tax amount by the rate and adds the tax. Remove mode divides the paid total by one plus the rate. Both directions show the pre-tax amount, tax, and total separately.
Example at 8.25%
A $100.00 pre-tax amount produces $8.25 tax and a $108.25 total. In reverse, a $108.25 tax-inclusive total produces a $100.00 pre-tax amount and $8.25 included tax.
Limits of the estimate
The calculator does not determine product taxability, sourcing, nexus, exemptions, or industry rules. Confirm both the rate and tax treatment with the relevant authority.
Frequently Asked Questions
Which sales tax rate should I enter?
Enter the combined rate that applies to the sale, including state and any applicable county, city, or district taxes. Rates and taxable goods vary by jurisdiction, so confirm the rate with the relevant state or local tax authority.
Does this calculator determine whether a sale is taxable?
No. It only applies or removes the rate you enter. Product exemptions, sales-tax nexus, sourcing rules, and local taxes are not determined automatically.
Add Tax vs. Remove Tax
Add mode starts with a pre-tax amount. Remove mode starts with a tax-inclusive total and divides by one plus the entered rate.
Does the rate include local sales tax?
Enter the full combined rate, including applicable state, county, city, and district components.
How are money amounts rounded?
The calculator rounds displayed pre-tax, tax, and total amounts to the nearest cent.
Does the calculator look up rates by ZIP code?
No. You supply the rate explicitly because the correct rate and sourcing can depend on the transaction.
