Reverse Sales Tax Calculator
Find the original pre-tax price from any total amount paid. Enter your total and tax rate below.
Calculate Pre-Tax Price
| Price Before Tax | $0.00 |
| Sales Tax (0%) | $0.00 |
| Total Price with Tax | $0.00 |
Common US Sales Tax Rates Reference
| State | State Rate | Avg Local | Combined Avg | Division Factor |
|---|---|---|---|---|
| California | 7.25% | 1.57% | 8.82% | 1.0882 |
| Texas | 6.25% | 1.95% | 8.20% | 1.0820 |
| New York | 4.00% | 4.52% | 8.52% | 1.0852 |
| Florida | 6.00% | 1.05% | 7.05% | 1.0705 |
| Illinois | 6.25% | 2.57% | 8.82% | 1.0882 |
| Washington | 6.50% | 2.78% | 9.28% | 1.0928 |
| Pennsylvania | 6.00% | 0.34% | 6.34% | 1.0634 |
| Tennessee | 7.00% | 2.55% | 9.55% | 1.0955 |
| Ohio | 5.75% | 1.49% | 7.24% | 1.0724 |
| Oregon | 0.00% | 0.00% | 0.00% | 1.0000 |
How Reverse Sales Tax Works
Reverse sales tax calculation recovers the original pre-tax price when you already know what you paid in total. Instead of adding tax to a price, you work backward from the final amount.
The Reverse Sales Tax Formula
The core formula has two steps. First, convert the tax percentage to a decimal by dividing by 100. Second, divide the total price by the sum of 1 plus the tax rate:
- Tax rate as a decimal = Tax % / 100
- Pre-tax price = Total price / (1 + Tax rate)
- Tax amount paid = Pre-tax price x Tax rate
Worked Example
Your credit card shows a charge of $858. Your state sales tax rate is 7.25%. To find the pre-tax price: divide $858 by 1.0725. The result is $800.00. The tax paid was $858 minus $800, which equals $58.00.
When You Need This Calculator
Use reverse sales tax when reconciling expense reports, verifying receipts, calculating the taxable base for returns, or understanding exactly how much of a total charge was tax versus the actual product price.
Reverse Sales Tax Formulas Summary
Key Variables
- Total Price with Tax (T) — the amount you actually paid
- Sales Tax Rate (r) — the percentage, such as 8.25%
- Pre-Tax Price (P) — the original list price
- Tax Amount (S) — the dollar amount of tax collected
All Four Formulas
- Sales Tax Rate = Sales Tax Percent / 100
- Pre-Tax Price = Total Price / (1 + Sales Tax Rate)
- Sales Tax Amount = Pre-Tax Price x Sales Tax Rate
- Total Price = Pre-Tax Price + Sales Tax Amount
Quick Division Shortcut
For the most common tax rates, you can memorize the division factor. A 10% tax means you divide by 1.10. An 8.25% tax means you divide by 1.0825. A 6% tax means you divide by 1.06. These one-step divisions give you the pre-tax price without any intermediate steps.
Frequently Asked Questions
Divide the total price by (1 plus the tax rate as a decimal). For example, if the total is $108 and the tax rate is 8%, divide $108 by 1.08 to get the pre-tax price of $100.
A reverse sales tax calculation works backward from the total price you paid to find the original pre-tax price and the exact dollar amount of tax collected during that transaction.
The formula is: Pre-tax price = Total price divided by (1 plus the tax rate as a decimal). Tax amount = Pre-tax price multiplied by the tax rate.
Yes. Enter any tax rate percentage, a state rate, a local rate, or a combined state and local rate, and the calculator will instantly produce the correct pre-tax price and tax amount.
You need reverse sales tax when a receipt shows only the total, when reconciling accounting records, or when you want to verify how much tax you actually paid on a purchase.
Yes, provided you use the exact tax rate that was applied at the time of purchase. The formula is mathematically precise. Small differences may appear if the merchant rounded the tax to the nearest cent.