Find the pre-tax price from any total.
Enter a tax-inclusive total, pick a rate, and instantly see what you paid before tax. Built for shoppers, bookkeepers, and small business owners who need the right answer in one click.
Next, enter the total you paid with tax included.
What Is a Reverse Tax Calculator?
A reverse tax calculator works backwards from a tax-inclusive total to find the original pre-tax price. The usual direction is familiar: a $100 item plus 8% sales tax comes to $108. Reverse tax flips that question. You paid $108, you know the rate was 8%, and you want to know the pre-tax price was $100.
This tool handles both directions. The inclusive (reverse) calculation pulls the pre-tax price out of a receipt total. The forward direction takes a pre-tax price and adds the tax on top.
It gets used by shoppers double-checking receipts, bookkeepers separating tax from tax-inclusive invoices, accountants reconciling quarterly returns, and anyone working with international purchases where VAT is embedded in the listed price. The same formula handles all of them.
Use the calculator above for any tax rate: US state sales tax, VAT, GST, or a custom percentage. Our editorial standards page covers how we source and verify the rate data.
Sales Tax Guide: Everything You Need to Know
What Is Sales Tax?
Sales tax is a consumption tax that state and local governments levy on retail transactions. Unlike income tax, the seller collects it at the point of sale and remits it to the state. There's no federal sales tax in the US. Each state sets its own rate, and counties and cities can layer more on top of that.
Five states have no statewide sales tax: Oregon, Montana, New Hampshire, Delaware, and Alaska (though some Alaskan localities do charge local sales tax). At the other end of the scale, combined state-plus-local rates can top 10% in parts of Tennessee, Louisiana, and Washington.
How Sales Tax Rates Are Set
Every state legislature sets a base rate. Local governments (counties, cities, and special districts) can add to that base. The result is that two stores a mile apart can charge different rates if they sit in different tax jurisdictions. The Tax Foundation's annual state tax tables are the standard reference. The IRS Sales Tax Deduction Calculator lets you look up your exact combined rate by ZIP code.
Tax-Inclusive vs. Tax-Exclusive Pricing Explained
Tax-exclusive pricing (standard in the US) means the price tag doesn't include tax. You see $49.99, and at checkout you pay $49.99 plus whatever tax applies. The receipt shows the subtotal and a separate tax line.
Tax-inclusive pricing (standard in Europe, Australia, and most of Asia) means the displayed price already includes tax. In the UK, a £20 price tag costs £20 at the till. The VAT is buried inside that £20. To pull the tax out, you have to divide rather than subtract. Our sales tax vs VAT comparison covers the full mechanics.
When You Need to Calculate the Pre-Tax Price
The most common reason is bookkeeping. Take a $107.50 software subscription that already has 7.5% tax baked in. The accountant needs to record $100 as the expense and $7.50 as a recoverable or deductible tax. Without running the reverse calculation, the books land in the wrong place.
Other scenarios: verifying a receipt is charged the right amount, calculating the deductible portion of a business purchase, comparing prices across state lines, or figuring out what your online order actually cost before marketplace tax. Try our guide to verifying receipt taxes for a step-by-step walkthrough, or see real reverse tax calculation examples with actual numbers.
Who Should Use This Calculator?
This tool is useful any time you're working backwards from a total that includes tax. Here are the people who use it most:
- Small business owners reconciling receipts for expense reports, reimbursements, or quarterly tax filings. If you paid a supplier $215.50 including tax, you need the pre-tax amount to record it correctly.
- Bookkeepers and accountants processing tax-inclusive invoices, particularly from vendors who use inclusive pricing (common with international suppliers and subscription services).
- Online shoppers checking whether a marketplace or retailer charged the right amount of tax, which matters most on large purchases where a fraction of a percent turns into real money.
- E-commerce sellers calculating how much of their collected revenue is tax that needs to be remitted to state revenue boards. See our guide to common sales tax mistakes that e-commerce sellers make.
- Travelers and international buyers working with VAT-inclusive prices in Europe, Australia, or Canada, where the tax is embedded and not separately stated on receipts.
- Freelancers figuring out the taxable portion of client payments or business purchases. Our sales tax guide for freelancers covers the specifics.
If you have a tax-inclusive total and need the pre-tax number, the calculator above handles it in one step, no spreadsheet required.
Frequently Asked Questions
Reverse tax calculation (also called "backing out" sales tax) determines the original pre-tax price when you only know the final tax-inclusive total. Instead of adding tax to a price, you divide the total by (1 + the tax rate as a decimal). For example, $108 at 8% tax: $108 ÷ 1.08 = $100 pre-tax, with $8 in tax.
The formula is: Pre-Tax Price = Total Amount ÷ (1 + Tax Rate ÷ 100). In decimal form, that's Pre-Tax = Total ÷ 1.08 for an 8% rate. Straight subtraction gives the wrong answer. Subtracting 8% from $108 returns $99.36, not the correct $100.00 you get through division.
Subtracting the tax rate directly gives a wrong answer because the percentage was applied to the pre-tax price, not to the total. When the total is $108 and tax is 8%, that 8% was calculated on $100, not on $108. Subtracting 8% of $108 gives $8.64, which leaves $99.36 instead of the correct $100. The division method (÷ 1.08) reverses the original math cleanly.
As of 2025, combined state and local average sales tax rates vary widely: California averages 8.68%, Texas averages 8.20%, New York averages 8.53%, Florida averages 7.01%, Washington averages 9.38%, and five states (Oregon, Montana, New Hampshire, Delaware, Alaska) have no statewide sales tax. Check your specific county or city, as local rates add to state rates.
Yes. VAT in Europe and GST in Canada, Australia, and New Zealand are all tax-inclusive pricing systems, meaning the tax is embedded in the listed price. The reverse formula is the same: Pre-Tax Price = Total ÷ (1 + VAT Rate ÷ 100). Common EU VAT rates include 20% (UK/France), 19% (Germany), and 21% (Netherlands). Just enter the rate and the calculator handles it the same way it handles US sales tax.
Your sales tax rate is printed on most retail receipts. You can also look it up on your state's Department of Revenue website, or use the IRS Sales Tax Deduction Calculator on irs.gov, which shows combined state and local rates by ZIP code. The Tax Foundation (taxfoundation.org) publishes updated state-by-state rate tables annually.
Tax-inclusive pricing (common in Europe and Australia) means the displayed price already includes tax, so what you see is what you pay. Tax-exclusive pricing (standard in the US and Canada) means tax gets added at the point of sale on top of the listed price. The calculator handles both: choose "Tax is included" for tax-inclusive totals or "Tax is NOT included" to add tax on top.
Yes. The calculator uses the standard accounting formula for reversing tax-inclusive amounts. For official tax filings, always reconcile against the original receipts rather than relying on any calculator alone. Some jurisdictions apply tiered rates (for example, different rates for food vs. non-food items), in which case each category needs to be calculated separately at its own rate.
This calculator works for any single percentage rate. If you need to separate both a tip and a tax from a total, you would need to subtract the known tip amount first, then apply the reverse tax calculation to the remaining subtotal. Alternatively, if only the combined rate is known, enter the combined percentage and the result will reflect both components.
The effective tax rate is the actual tax percentage paid relative to the pre-tax price: Effective Rate = (Tax Amount ÷ Pre-Tax Price) × 100. For a clean reverse calculation, it should match the rate you typed in. Any drift past 2 to 3 decimal places usually just means rounding on small amounts.
Reverse Tax Calculator Team
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