US Sales Tax Calculator
Combined state + local sales tax on a sale — total, tax amount and the back-out from a tax-inclusive receipt.
Formula
US sales tax is destination-based and stacks state + county + city + special-district rates — over 11,000 jurisdictions, no federal VAT. Since the 2018 Wayfair ruling, remote sellers must collect once they cross a state's economic nexus threshold (often $100k or 200 transactions).
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Need us sales tax calculator results fast? Analysts, founders, traders and finance professionals use the US Sales Tax Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About US Sales Tax Calculator
Combined state + local sales tax on a sale — total, tax amount and the back-out from a tax-inclusive receipt. US sales tax is destination-based and stacks state + county + city + special-district rates — over 11,000 jurisdictions, no federal VAT. Since the 2018 Wayfair ruling, remote sellers must collect once they cross a state's economic nexus threshold (often $100k or 200 transactions). The governing relationship is combined rate = state + local; tax = amount × combined. The US Sales Tax Calculator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use US Sales Tax Calculator
- 1Enter Pre-tax amount ($), State rate (%), County + city rate (%), Amount is into the US Sales Tax Calculator.
- 2The result is computed automatically using combined rate = state + local; tax = amount × combined — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use US Sales Tax Calculator?
- ✓Computes us sales tax calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the US Sales Tax Calculator?+
US Sales Tax Calculator uses combined rate = state + local; tax = amount × combined. US sales tax is destination-based and stacks state + county + city + special-district rates — over 11,000 jurisdictions, no federal VAT. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the US Sales Tax Calculator need?+
Enter Pre-tax amount ($), State rate (%), County + city rate (%), Amount is and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the US Sales Tax Calculator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the US Sales Tax Calculator?+
Since the 2018 Wayfair ruling, remote sellers must collect once they cross a state's economic nexus threshold (often $100k or 200 transactions).
What is the US Sales Tax Calculator based on?+
The method follows authoritative sources: South Dakota v. Wayfair (2018); state DOR rates. The formula and references are shown on the page so you can verify and cite the result.
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