Sales Tax Reverse Calculator
US, 2026 tax year · figures follow that year's rules
Reverse Sales Tax Calculator works out Sales tax and Total including tax from Amount, State and Custom tax rate. The default figures on this page give price before tax of 92.38 USD; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- Custom rate entered: 8.25%
- Price before tax = 100 / (1 + 8.25%) = 92.38
- Tax included = 100 - 92.38 = 7.62
Figures from US state sales tax rates, 2026 rules, checked 5 September 2026. Its 9 worked examples are re-run on every release, last on 15 September 2026. What changed · how reference data is kept current
Sources and references
7 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the Reverse Sales Tax Calculator calculates
Adds US state and local sales tax to a price, backs the tax out of a total already paid, or looks up the rate: every state and DC from the departments' published 2026 general rates, with scheduled changes applied by date of sale.
How to use this Reverse Sales Tax Calculator
Enter Amount, State, Custom tax rate and Local rate on top. Sales tax updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Sales tax, Total including tax and Price before tax.
The method follows Texas Comptroller, Sales and Use Tax: 6.25% state rate; local jurisdictions up to 2% for a maximum combined rate of 8.25%, California Department of Tax and Fee Administration: statewide 7.25% base (6% state + 1.25% mandatory local) and the city and county rate table effective 1 July 2026 (7.25% to 11.25%), New York State Publication 718, Sales and Use Tax Rates by Jurisdiction: 4% state rate; New York City and Yonkers 8 7/8% including the 3/8% MCTD rate, DC Office of Tax and Revenue, Taxable and Non-Taxable Services: general rate 6.0% until 30 September 2026 and 7.0% from 1 October 2026 (Sales Tax Increase Delay Amendment ACT of 2025) and Virginia Tax, Retail Sales and Use Tax: 5.3% general rate (4.3% state under Va. Code 58.1-603 plus 1% local) with 6%, 6.3% and 7% regional rates.
What you can compare
Change one input at a time to see how it affects Sales tax, Total including tax and Price before tax. The inputs you can vary are Amount, State, Custom tax rate, Local rate on top, Quantity and Trade-in allowance.
Understanding Sales tax, Total including tax and Price before tax
State rates are the general rates each revenue department publishes as of 5 September 2026; local rates change quarterly and depend on the exact address, so confirm the combined rate with the state department for the sale location. Food, lodging, vehicle and other special rates are not modelled.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How to calculate reverse tax?
Adds US state and local sales tax to a price, backs the tax out of a total already paid, or looks up the rate: every state and DC from the departments' published 2026 general rates. Open “How this is worked out” beside the result to see each step for your own figures.
How to calculate reverse tax formula?
It needs Amount, State, Custom tax rate, Local rate on top, Quantity and Trade-in allowance. Nothing else is required, and the figures stay in your browser.
How to calculate tax backwards from total?
The result gives Sales tax, Total including tax, Price before tax, Amount the tax was charged on, Tax at the state rate and Tax at the local rate, each labelled with its unit so the figure can be read on its own.
How do you do a reverse calculation?
The page opens with worked default figures: price before tax of 92.38 USD. Replace them with your own and every figure updates as you type.
What information do I need for the Reverse Sales Tax Calculator?
You need Amount, State, Custom tax rate, Local rate on top, Quantity, Trade-in allowance and Date of sale. The page opens with default figures that give price before tax of 92.38 USD, so you can see the scale before entering your own.
What does this Reverse Sales Tax Calculator show?
It shows Sales tax, Total including tax, Price before tax, Amount the tax was charged on, Tax at the state rate, Tax at the local rate, Combined rate applied and State rate used, with the working and any warnings for your entries.