Introduction
A reverse sales tax calculator works backward from a total price. You type in the amount you paid and the tax rate. It shows you the original price before tax and how much of that money was tax.
This helps when a receipt only shows one number. It also helps when you need the pre-tax price for a business expense, an expense report, or a tax deduction. Sellers use it too, when a shelf price already includes tax and they need to split out the tax to report it.
The math is simple. Divide the total by 1 plus the tax rate. If you paid $108.25 with an 8.25% tax rate, divide $108.25 by 1.0825. The original price was $100.00, and the tax was $8.25. If you want to work the other direction and add tax to a price, use the Sales Tax Calculator instead.
This tool does that math for you. Pick your state to fill in the average rate, or tap a common rate button, or type your own. You get the pre-tax price, the tax amount, a receipt-style breakdown, and step-by-step work you can check. There is also a Receipt Overcharge Checker that compares the tax you were charged to the tax you should have paid, so you can spot a mistake before you leave the store.
How to use our Reverse Sales Tax Calculator
Enter the total price you paid and the sales tax rate. The calculator shows the original price before tax, the tax amount you paid, a step-by-step solution, and a chart of your price breakdown.
Final Price (With Tax): Type the full amount from your receipt, including sales tax. For example, enter 108.25.
Sales Tax Rate: Type the tax rate as a percent, like 8.25. You can find this on your receipt. If you only know the dollar amount of tax and the subtotal, the Tax Percentage Calculator can find the rate for you.
Select State / Jurisdiction (Optional): Pick your state to fill in the average tax rate for you. You can still change the rate by hand. For state-specific figures, see the State Tax Calculator, the Missouri Sales Tax Calculator, the NJ Sales Tax Calculator, or the NYC Sales Tax Calculator.
Common Rates: Tap a button like 7% or 8.875% to set that rate fast.
Calculate: Select this to see your pre-tax price, tax paid, and total. Use Reset Calculator to start over.
Total Amount Paid (Overcharge Checker): Type the total on your receipt to check if the store charged the right tax.
Pre-Tax Price on Receipt: Type the subtotal shown before tax was added.
Tax Rate (%): Type the tax rate that should apply to your purchase.
Check Receipt: Select this to compare the tax you were charged with the tax you should have paid. The result tells you if you were overcharged, undercharged, or charged correctly.
What Is Reverse Sales Tax?
Reverse sales tax means working backward. You start with the total price you paid, and you take the tax out of it. What is left is the original price of the item before tax. This is also called a "sales tax backwards" or "pre-tax price" calculation. The same idea applies to other tax systems too, which is why there are separate tools like the Reverse Tax Calculator, the Remove VAT Calculator, and the GST Calculator.
The Formula
To find the price before tax, divide the total by 1 plus the tax rate:
- Original Price = Total Price ÷ (1 + Tax Rate)
- Tax Paid = Total Price − Original Price
Example: You paid $108.25 and the tax rate is 8.25%. Turn 8.25% into 0.0825. Add 1 to get 1.0825. Then $108.25 ÷ 1.0825 = $100.00. The tax you paid was $8.25.
Why You Should Not Just Subtract the Percent
A common mistake is taking 8.25% off the total. That gives the wrong answer. Tax is added on top of the smaller pre-tax price, not the bigger total. Taking a percent off the total removes too much money. Always divide instead. If you want to see how big that gap is, run both numbers through the Percentage Calculator or the Percent Difference Calculator.
When People Need This
- Business expenses: Sales tax is often listed apart from the item cost in your books, which matters when you figure margin or markup on what you sell.
- Tax deductions: Some people deduct state and local sales tax on their federal return, which lowers taxable income and can change your refund.
- Faded or missing receipts: If the receipt only shows one number, you can split it back out.
- Price setting: Sellers who want a round total price, like $20.00 out the door, need to know the pre-tax amount. Online sellers should also check the eBay Fee Calculator, Etsy Fee Calculator, or PayPal Fee Calculator.
- Refunds and returns: You get the tax back too, so you need to know how much of the total was tax.
- Tax-free shopping: Travelers and resellers claiming a refund must show the tax portion. Imported goods may also carry a customs duty on top.
About U.S. Sales Tax Rates
There is no national sales tax in the United States. Each state sets its own rate, and cities and counties can add more on top. That is why a rate can look odd, like 8.875% in New York City or 9.55% in Tennessee. Five states — Alaska, Delaware, Montana, New Hampshire, and Oregon — have no statewide sales tax, though some Alaska towns still charge a local tax. Sales tax is separate from income tax, so for wage withholding see the Income Tax Calculator or the Paycheck Calculator.
Rates also change by what you buy. Many states tax groceries, medicine, or clothing at a lower rate or not at all. If your receipt has both taxed and untaxed items, run the numbers only on the taxed part. Big-ticket buys such as a car often carry their own rules — the Out The Door Price Calculator and the Road Tax Calculator handle those.
Checking a Receipt for Overcharges
Stores make errors. A wrong tax code, an old rate, or a taxed item that should be tax-free can all cost you money. To check, multiply the pre-tax subtotal by the tax rate and compare it to the tax line on your receipt. If the store charged more, ask for a refund of the difference. Small gaps of a penny or two are usually just rounding, not a real error. When a coupon or sale price is involved, confirm the discounted subtotal first with the Discount Calculator, and if you are splitting a restaurant bill, the Tip Calculator keeps tax and gratuity straight.
A Quick Mental Shortcut
Move the decimal in your rate and add it to 1. A 7% rate becomes 1.07. A 10% rate becomes 1.10. A 6.5% rate becomes 1.065. Divide your total by that number and you have the pre-tax price. Tracking these totals across a month? Drop them into the Budget Calculator or the Expense Calculator to see where your money goes.