Reverse Sales Tax Calculator

Reverse Sales Tax Calculator

Remove sales tax from any total price to find the original pre-tax amount. Select your state or enter a custom rate, then enter what you paid. The calculator shows the pre-tax price, tax amount, and the exact formula used. Use the Bulk Receipts tab to reverse-calculate multiple items at once.

Reverse Sales Tax Calculator

Pre-tax price · tax amount · step-by-step formula · state rate lookup · bulk receipts

Quick Rate Presets
Step-by-Step Formula
Item / Description Total Paid ($) Rate (%) Pre-Tax Tax

How to Remove Sales Tax from a Total Price

A reverse sales tax calculator works backward from a total price that already includes tax to find the original pre-tax price. This is useful when you know what you paid in total and want to find the item's list price before tax was added, for expense reports, business accounting, receipt verification, or comparing prices across different tax jurisdictions.

The formula is straightforward: Pre-Tax Price = Total Price ÷ (1 + Tax Rate). The key insight is dividing by one plus the rate rather than subtracting the percentage directly. Subtracting the percentage from the total gives the wrong answer because the tax percentage was applied to the smaller pre-tax price, rather than to the larger total.

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Common mistake, do this instead: If you paid $108.00 with 8% tax and you subtract 8% directly: $108.00 × 8% = $8.64, giving an incorrect "pre-tax" of $99.36. The correct method: $108.00 ÷ 1.08 = $100.00 pre-tax, with $8.00 in tax. The difference exists because the 8% applied to the $100 pre-tax price rather than to the $108 total.

The Reverse Sales Tax Formula (Step by Step)

Given any total price paid (including tax) and the sales tax rate, here are the four steps:

  • Step 1 · Convert rate to decimal: Tax Rate = Tax% ÷ 100. For 7.5% tax: 7.5 ÷ 100 = 0.075
  • Step 2 · Calculate the division factor: Division Factor = 1 + Tax Rate = 1 + 0.075 = 1.075
  • Step 3 · Find pre-tax price: Pre-Tax Price = Total Price ÷ Division Factor
  • Step 4 · Find tax amount: Tax Amount = Pre-Tax Price × Tax Rate
Worked Example · $858 total, 7.25% tax (California state rate)

Step 1: 7.25% ÷ 100 = 0.0725

Step 2: 1 + 0.0725 = 1.0725

Step 3: $858.00 ÷ 1.0725 = $800.00 pre-tax price

Step 4: $800.00 × 0.0725 = $58.00 tax paid

Result: Pre-tax price $800.00 + tax $58.00 = $858.00 total ✓

Shortcut Divisors for Common Tax Rates

Instead of doing multi-step division every time, memorize the division factor for your local rate and apply it instantly to any total. The calculator above shows the shortcut for whichever rate you enter.

Tax RateDivision FactorExample: $100 Total PaidPre-Tax Price
5%÷ 1.0500$100.00 ÷ 1.05$95.24
6%÷ 1.0600$100.00 ÷ 1.06$94.34
6.25%÷ 1.0625$100.00 ÷ 1.0625$94.12
7%÷ 1.0700$100.00 ÷ 1.07$93.46
7.25%÷ 1.0725$100.00 ÷ 1.0725$93.24
7.5%÷ 1.0750$100.00 ÷ 1.075$93.02
8%÷ 1.0800$100.00 ÷ 1.08$92.59
8.25%÷ 1.0825$100.00 ÷ 1.0825$92.37
8.875%÷ 1.0888$100.00 ÷ 1.08875$91.85
9%÷ 1.0900$100.00 ÷ 1.09$91.74
10%÷ 1.1000$100.00 ÷ 1.10$90.91

* These are state-only rates. Combined state + local rates in your city may be higher. Use the state dropdown in the calculator to load your state rate, then add any local surcharge manually.

When to Use a Reverse Sales Tax Calculator

Business Expense Reports

When submitting expense reports, many companies require the pre-tax amount for accounting and reimbursement purposes. A receipt shows the total paid, but the accounting system needs the net price and tax amount listed separately. The reverse calculation separates them in seconds from any receipt.

Verifying a Receipt or Invoice

If a receipt lists a total but you're unsure the tax was calculated correctly, reverse-calculate the pre-tax price from the total and your local rate, then verify the tax amount matches. This is particularly useful for large purchases or when buying in an unfamiliar state with a different local rate than your home state.

Comparing Prices Across Tax Jurisdictions

If you're comparing a $549 price in a 0% sales tax state versus a $599 price in a 9% sales tax state, the true comparison requires knowing the pre-tax equivalent of each total. The reverse calculation makes this comparison apples to apples.

Pricing Products to Hit a Target Total

Businesses that want their retail price to land at a round number (e.g., "$19.99 total including tax") work backward from the desired total to find the list price they should set: $19.99 ÷ 1.0825 (at 8.25%) = $18.47 list price + $1.52 tax = $19.99 total.

Frequently Asked Questions

How do I calculate pre-tax price from total? −
Divide the total price by (1 + the tax rate as a decimal). Example: if you paid $107.50 with a 7.5% tax rate, divide $107.50 by 1.075 to get $100.00 pre-tax. The tax paid was $107.50 minus $100.00 = $7.50. The key is dividing by the division factor (1 + rate), not subtracting the percentage directly from the total, subtracting directly gives an incorrect result because the tax percentage was applied to the smaller pre-tax amount, not the total. The calculator above does this automatically and shows the step-by-step formula.
What is the formula to back out sales tax from a total? −
The reverse sales tax formula is: Pre-Tax Price = Total Price ÷ (1 + Tax Rate). Convert the percentage to a decimal first (divide by 100). For 8.25% tax: Pre-Tax = Total ÷ 1.0825. Tax Amount = Total − Pre-Tax. Alternatively, Tax Amount = Pre-Tax × 0.0825. A useful shortcut: the division factor for any tax rate is simply 1 followed by the decimal rate. For 6%: divide by 1.06. For 8.875%: divide by 1.08875.
Why can't I just subtract the tax percentage from the total? −
Because the tax percentage was applied to the original pre-tax price, not to the total. When you pay $108 with 8% tax: the tax was 8% of the $100 pre-tax price ($8), not 8% of the $108 total ($8.64). Subtracting 8% from $108 gives $99.36, which is wrong. Dividing $108 by 1.08 gives the correct $100.00. The percentage point matters more as the rate increases: at a 10% tax, subtracting 10% from the total is off by nearly $1 on every $110 spent.
What is a reverse sales tax calculator used for? −
A reverse sales tax calculator finds the original pre-tax price and the sales tax amount when you know the final total paid and the tax rate. Common uses: separating net price from tax on expense receipts, verifying that a vendor charged the correct tax amount, comparing prices from different tax jurisdictions, setting a product list price to hit a specific round-number retail total, and accounting for sales tax in bookkeeping when entering transactions from receipts. The Bulk Receipt tab in the calculator above handles multiple line items simultaneously.
How do I find the sales tax rate from a receipt? −
If your receipt shows both the pre-tax price and the total paid, find the implied tax rate with: Tax Rate = (Total − Pre-Tax) ÷ Pre-Tax × 100. Example: receipt shows $42.00 pre-tax and $45.36 total. Rate = ($45.36 − $42.00) ÷ $42.00 × 100 = $3.36 ÷ $42.00 × 100 = 8%. Use our Sales Tax Calculator (the "Find the Rate" tab) to calculate this directly. Compare the result against your state and local rates to verify the vendor applied the correct rate.
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The Formula
Pre-Tax Price Total ÷ (1 + Rate) Tax Amount Total − Pre-Tax Division factor 1.0625 for 6.25% tax Division factor 1.0825 for 8.25% tax Division factor 1.08875 for 8.875% tax Wrong method Total × Rate% = incorrect tax Right method Total ÷ (1 + Rate) = pre-tax
Common Shortcut Divisors
Divide total by these to get pre-tax price 5% tax ÷ 1.0500 6% tax ÷ 1.0600 7% tax ÷ 1.0700 7.25% tax (CA) ÷ 1.0725 8% tax ÷ 1.0800 8.25% tax (TX) ÷ 1.0825 8.875% tax (NYC) ÷ 1.08875 10% tax ÷ 1.1000