You're looking at a $54.83 charge on your card and the receipt just shows the total — no tax line, no breakdown. Your expense report needs the pre-tax amount. That's exactly what this calculator is for. This page covers the formula, five real worked examples with non-round numbers, an Excel shortcut, and the current rates for all 50 states. If you just need the number, use the calculator above.
What Is Reverse Sales Tax?
A reverse sales tax calculator finds the original price before sales tax by working backward from a total that already includes tax. You enter the total paid and the tax rate, and it divides out the tax portion to show you what the item cost before tax was applied.
The contrast matters: a standard sales tax calculator multiplies a known price by a rate to add tax on top. A reverse calculator does the opposite — it removes the embedded tax from a total you've already paid. Same relationship, different unknown. The formula solves for the pre-tax price instead of the total.
One sentence statement of the formula: Pre-Tax Price = Total Paid ÷ (1 + Tax Rate). The section below walks through every step.
The Reverse Sales Tax Formula (Step-by-Step)
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Get your total paid (tax-included)
Find the number on your receipt, bank statement, or invoice. This is the amount after tax — the full amount you actually paid. Don't estimate; use the exact figure.
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Find your tax rate
Look at your receipt — it's usually printed near the bottom. Or use the state dropdown in the calculator above, or check the state rates table further down this page. Remember: your rate is likely a combined rate — state + county + city layers stacked on top of each other.
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Add 1 to the rate as a decimal
Convert the rate: divide by 100. If your rate is 8.25%, that's 8.25 ÷ 100 = 0.0825. Then add 1: 1 + 0.0825 = 1.0825. This number is your divisor.
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Divide the total by that number
Pre-tax price = Total paid ÷ 1.0825. That's it. The result is what the item cost before any tax was added.
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Subtract to find the tax amount
Tax paid = Total paid − Pre-tax price. If you need to report the tax separately — for an expense report, bookkeeping entry, or tax filing — this is the number.
Pre-Tax Price = Total Paid ÷ (1 + Tax Rate/100)
Tax Amount = Total Paid − Pre-Tax Price
Why you divide instead of subtract: The tax percentage was applied to the pre-tax price, not to the total. That means the $8 tax in a $108 total represents 8% of the $100 pre-tax price — but it's only 7.41% of the $108 total. If you subtracted 8% from $108, you'd get $99.36 instead of $100.00. Thirty-six cents wrong on a small transaction, but the error compounds significantly on larger amounts or across hundreds of bookkeeping entries.
5 Worked Examples With Real Numbers
Every competitor uses round-number examples like "$100 at 8%." Here are real receipt-style numbers across real use cases.
Example 1 — Expense Report (Office Purchase, Texas)
You bought a laptop stand in Houston for a work trip. The charge on your card: $83.47. Texas combined rate in Houston: 8.25%.
$83.47 ÷ 1.0825 = $77.10 pre-tax price
$83.47 − $77.10 = $6.37 tax paid
Your expense report gets $77.10 in the "amount" field and $6.37 in the "tax" field.
Example 2 — Online Shopping Return (California)
You bought a jacket online, total paid: $247.18. California average combined rate: 8.82%.
$247.18 ÷ 1.0882 = $227.14 pre-tax price
$247.18 − $227.14 = $20.04 tax paid
When you return it, you should get the full $247.18 back. If the refund is less, the tax amount is $20.04 — use that to verify the refund is correct.
Example 3 — Small Business Bookkeeping (New York)
A retailer had total sales for the day of $1,847.35 in NYC at a combined rate of 8.875%.
$1,847.35 ÷ 1.08875 = $1,696.73 actual revenue
$1,847.35 − $1,696.73 = $150.62 tax collected (must be remitted)
The $150.62 is not business income — it belongs to the state. It should be booked as a liability, not revenue.
Example 4 — Finding the Tax Rate From Two Prices
You have an old receipt showing pre-tax price: $54.99, total paid: $59.38. What rate was charged?
Tax amount = $59.38 − $54.99 = $4.39
Tax rate = ($4.39 ÷ $54.99) × 100 = 7.98%
That's consistent with a combined rate near 8% — common in states like Ohio or Pennsylvania.
Example 5 — Quick Mental Check at a Store
Item sticker price: $29.99. You paid $32.58. Were you charged the right rate?
$32.58 − $29.99 = $2.59 tax paid
$2.59 ÷ $29.99 × 100 = 8.64%
If your area's combined rate is 8.5%, this is slightly high — worth double-checking. Could be rounding, could be an error.
The Excel (and Google Sheets) Formula
If you're reconciling transactions in a spreadsheet, you don't need to calculate each one manually. Put your totals in column A, your tax rates in column B, and paste this into column C:
=A2/(1+(B2/100))
Where A2 = total paid (including tax), B2 = tax rate as a percentage (e.g. 8.25, not 0.0825).
| Col A — Total Paid | Col B — Tax Rate % | Col C — Pre-Tax Result |
|---|---|---|
| $83.47 | 8.25 | =A2/(1+(B2/100)) → $77.10 |
| $247.18 | 8.82 | =A3/(1+(B3/100)) → $227.14 |
| $1,847.35 | 8.875 | =A4/(1+(B4/100)) → $1,696.73 |
Copy the formula into column C and drag it down for a full list of transactions. Add a column D with =A2-C2 to pull out the tax amount per row. This works identically in Google Sheets.
Quick Reference — US State Sales Tax Rates 2025
These are average combined rates — state rate plus the average local component. Your exact local rate may differ by county or city. Use a state-specific calculator or enter a custom rate in the calculator above for a precise result.
Five states with no sales tax are highlighted: Alaska (no state tax, but local rates apply), Delaware, Montana, New Hampshire, and Oregon.
| State | State Rate | Avg Local Rate | Combined Rate |
|---|---|---|---|
| Alabama | 4.00% | 5.27% | 9.27% |
| Alaska * | 0.00% | 1.82% | 1.82% |
| Arizona | 5.60% | 2.80% | 8.40% |
| Arkansas | 6.50% | 2.97% | 9.47% |
| California | 7.25% | 1.60% | 8.85% |
| Colorado | 2.90% | 4.89% | 7.79% |
| Connecticut | 6.35% | 0.00% | 6.35% |
| Delaware * | 0.00% | 0.00% | 0.00% |
| Florida | 6.00% | 1.02% | 7.02% |
| Georgia | 4.00% | 3.38% | 7.38% |
| Hawaii | 4.00% | 0.44% | 4.44% |
| Idaho | 6.00% | 0.03% | 6.03% |
| Illinois | 6.25% | 2.57% | 8.82% |
| Indiana | 7.00% | 0.00% | 7.00% |
| Iowa | 6.00% | 0.94% | 6.94% |
| Kansas | 6.50% | 2.20% | 8.70% |
| Kentucky | 6.00% | 0.00% | 6.00% |
| Louisiana | 5.00% | 5.10% | 10.10% |
| Maine | 5.50% | 0.00% | 5.50% |
| Maryland | 6.00% | 0.00% | 6.00% |
| Massachusetts | 6.25% | 0.00% | 6.25% |
| Michigan | 6.00% | 0.00% | 6.00% |
| Minnesota | 6.875% | 0.66% | 7.54% |
| Mississippi | 7.00% | 0.07% | 7.07% |
| Missouri | 4.225% | 4.06% | 8.29% |
| Montana * | 0.00% | 0.00% | 0.00% |
| Nebraska | 5.50% | 1.44% | 6.94% |
| Nevada | 6.85% | 1.39% | 8.24% |
| New Hampshire * | 0.00% | 0.00% | 0.00% |
| New Jersey | 6.625% | -0.03% | 6.60% |
| New Mexico | 4.875% | 2.72% | 7.60% |
| New York | 4.00% | 4.53% | 8.53% |
| North Carolina | 4.75% | 2.25% | 7.00% |
| North Dakota | 5.00% | 2.04% | 7.04% |
| Ohio | 5.75% | 1.49% | 7.24% |
| Oklahoma | 4.50% | 4.49% | 8.99% |
| Oregon * | 0.00% | 0.00% | 0.00% |
| Pennsylvania | 6.00% | 0.34% | 6.34% |
| Rhode Island | 7.00% | 0.00% | 7.00% |
| South Carolina | 6.00% | 1.44% | 7.44% |
| South Dakota | 4.20% | 1.90% | 6.10% |
| Tennessee | 7.00% | 2.55% | 9.55% |
| Texas | 6.25% | 1.95% | 8.20% |
| Utah | 6.10% | 1.09% | 7.19% |
| Vermont | 6.00% | 0.44% | 6.44% |
| Virginia | 5.30% | 0.47% | 5.77% |
| Washington | 6.50% | 2.68% | 9.18% |
| West Virginia | 6.00% | 0.56% | 6.56% |
| Wisconsin | 5.00% | 0.44% | 5.44% |
| Wyoming | 4.00% | 1.36% | 5.36% |
| District of Columbia | 6.00% | 0.00% | 6.00% |
* No statewide sales tax. Alaska allows local jurisdictions to levy their own rates (average 1.82%). Delaware, Montana, New Hampshire, and Oregon have zero at both levels. Source: Tax Foundation, 2025.
Who Uses a Reverse Sales Tax Calculator?
The tool looks simple but covers a surprising range of real situations. Here are the five main groups who reach for it regularly.
Shoppers & Consumers
You bought something and want to know how much of the price was actually tax — or you're verifying a return refund. If you paid $247.18 and the store refunds $230.00, you need the tax breakdown to know whether the refund is correct.
Small Business Owners
When you take in $10,000 in sales at an 8% combined rate, $740.74 of that isn't yours — it belongs to the state. Reverse calculation separates your actual revenue from the tax you collected on the state's behalf. Get it wrong and your books are wrong.
Bookkeepers & Accountants
You're reconciling 200 transactions in QuickBooks and every one shows a total. The multi-item mode on this calculator handles that in one pass — paste in totals, get a full breakdown you can export. Beats doing the division 200 times by hand.
Freelancers & Self-Employed
You invoiced $3,500 for a project in a state that requires you to collect sales tax. What's your actual income? Not $3,500. Reverse calculation tells you how much was your fee and how much was tax you're obligated to remit.
Students Learning Tax Math
This is the cleaner way to understand why tax math works the way it does. The moment you see why subtracting the percentage gives the wrong answer — because the tax was calculated on the pre-tax price, not the total — the formula makes permanent sense.
The Most Common Reverse Sales Tax Mistakes
These three errors account for most of the wrong numbers people end up with. The first one is by far the most common.
Mistake 1 — Subtracting the Rate Percentage from the Total
This is the single most common error. If you paid $108 and the rate is 8%, many people calculate: $108 × 0.08 = $8.64, then subtract to get $99.36. Wrong. The correct answer is $108 ÷ 1.08 = $100.00. The difference is $0.64 here, but on a $10,000 transaction at the same rate, the error grows to $64. Across hundreds of bookkeeping entries, it adds up to a real discrepancy.
Mistake 2 — Using the State Rate Instead of the Combined Rate
In most states, the combined rate (state + county + city) is meaningfully higher than the state rate alone. In Los Angeles, the state rate is 7.25% but the combined rate is 10.25% — a three-point gap. Using 7.25% when the real rate is 10.25% gives you a pre-tax price that's too high and a tax amount that's too low. Always confirm whether you're using a state-only or combined rate before calculating.
Mistake 3 — Applying One Rate to a Mixed Receipt
In many states, groceries and prescription drugs are tax-exempt while other items on the same receipt are taxable. If your $84.50 receipt includes both taxable and non-taxable items, you can't reverse-calculate the entire receipt as a single number — you'd be dividing out tax that was never charged on part of the total. Handle each taxable line separately, or verify whether a given item was taxed by checking the receipt itself.
Reverse Sales Tax vs. VAT — Key Difference
The math is identical, but the context is different in a way that matters when you're looking at a receipt.
US sales tax is applied at the point of sale and added on top of the displayed price. If a store shows a $100 jacket, you pay $100 plus tax — the $100 price tag does not include tax. VAT (common in the UK and the EU) works the other way: it's baked into the advertised price before you see it. A £120 jacket in London already has 20% VAT embedded — the £120 is the tax-inclusive price.
Because both are percentage-based additions to a base price, the reverse formula works for both: divide the total by (1 + rate). The only practical difference is what the "total" represents. For US sales tax, the total is what you paid at the register after the price tag was adjusted. For VAT, the total is the price tag itself.
Example: UK item priced at £120 with 20% VAT → £120 ÷ 1.20 = £100 net price. The VAT calculator on this site handles this calculation directly.
Printable Quick Reference Card
Keep the formula handy without opening a browser. Click the button below to print — the card includes the formula and pre-calculated divisors for eight common tax rates.
| Tax Rate | Divisor (1 + rate) | Example: $100 Total | Pre-Tax Price |
|---|---|---|---|
| 5.00% | 1.0500 | $100 ÷ 1.0500 | $95.24 |
| 6.00% | 1.0600 | $100 ÷ 1.0600 | $94.34 |
| 7.00% | 1.0700 | $100 ÷ 1.0700 | $93.46 |
| 8.00% | 1.0800 | $100 ÷ 1.0800 | $92.59 |
| 8.25% | 1.0825 | $100 ÷ 1.0825 | $92.38 |
| 8.50% | 1.0850 | $100 ÷ 1.0850 | $92.17 |
| 9.00% | 1.0900 | $100 ÷ 1.0900 | $91.74 |
| 9.50% | 1.0950 | $100 ÷ 1.0950 | $91.32 |
Frequently Asked Questions
Divide the total price (including tax) by 1 plus the tax rate expressed as a decimal. For example, if you paid $107 and the tax rate is 7%, the formula is $107 ÷ 1.07 = $100.00. That $100 is the pre-tax price. Subtract from the total to get the tax amount: $107 − $100 = $7. The key is dividing by (1 + rate), not subtracting the percentage — because the tax was calculated on the pre-tax price, not the total you paid.
Because the tax percentage was applied to the pre-tax price, not the total. If you paid $107 with a 7% tax, the $7 tax is 7% of the $100 pre-tax price — but it's only 6.54% of the $107 total. If you subtract 7% from $107, you get $99.51, which is wrong by $0.49. Small difference on one transaction, but across hundreds of expense entries or bookkeeping records, it creates a real cumulative error.
If you have both the pre-tax price and the total, you can calculate the rate yourself: subtract the pre-tax price from the total to get the tax amount, then divide that tax amount by the pre-tax price and multiply by 100. Example: you paid $59.38 on an item priced at $54.99. Tax amount = $4.39. Rate = ($4.39 ÷ $54.99) × 100 = 7.98%. That's consistent with a combined rate near 8%, common in states like Ohio or Pennsylvania. Example 4 in the worked examples section above shows this in detail.
Yes, the math is identical. Both sales tax and VAT are percentage-based additions to a base price, so the reverse formula — divide the total by (1 + rate) — works for both. The practical difference is that VAT is embedded in the displayed price in the UK and EU (so the price tag is already tax-inclusive), while US sales tax is added on top at the register. Just make sure you're using the correct VAT rate for the country or product category. UK standard VAT is 20%, EU rates vary by country and product type.
The table above lists current average combined rates (state + local average) for all 50 states as of 2025, sourced from the Tax Foundation. Combined rates range from 0% in Oregon, Delaware, Montana, and New Hampshire to over 10% in Louisiana and Tennessee. For the exact rate at your specific address — which can differ significantly from the state average — check your state's department of revenue website, or look at a recent receipt from that location. The custom rate field in the calculator above accepts any rate you enter.
The formula is: Pre-Tax Price = Total Paid ÷ (1 + Tax Rate/100). If you paid $108 at an 8% tax rate, convert 8% to a decimal (0.08), add 1 to get 1.08, then divide: $108 ÷ 1.08 = $100.00 pre-tax. Tax amount = $108 − $100 = $8. This works because the seller multiplied the original price by (1 + rate) to get your total — dividing by that same factor reverses the operation exactly.
Take the total you paid and divide by (1 + the tax rate as a decimal). Example: your total is $54.83 and the combined rate is 8.25%. Step 1 — convert: 8.25 ÷ 100 = 0.0825. Step 2 — add 1: 1.0825. Step 3 — divide: $54.83 ÷ 1.0825 = $50.65. Step 4 — tax amount: $54.83 − $50.65 = $4.18. The calculator at the top of this page does all four steps automatically — enter the total and select your state or type in a custom rate.
"Backing out" tax means finding the pre-tax price hidden inside the total. Divide the total by (1 + rate). For a $75.00 total at 6% tax: $75.00 ÷ 1.06 = $70.75 pre-tax. Tax backed out: $75.00 − $70.75 = $4.25. Important: this is different from taking 6% of $75 (which gives $4.50 and is wrong). The difference exists because the 6% was originally charged on $70.75, not on the $75.00 total you paid.
Mathematically, yes — both use the identical formula: divide the tax-inclusive total by (1 + rate). The difference is context. In the US, sales tax is added at the register on top of the shelf price. In the UK and EU, VAT is already embedded in the displayed price. UK example at 20% VAT: £120.00 ÷ 1.20 = £100.00 ex-VAT. Same calculation, different label. Just make sure you're using the right rate — UK standard VAT is 20%, EU rates vary by country and product category.
Divide the total you paid by (1 + the tax rate as a decimal). The "original price before tax" is also called the pre-tax price, base price, or net price. Example: your receipt shows $32.58, you're in an area with an 8.5% combined rate. Original price = $32.58 ÷ 1.085 = $30.03. Verify it: $30.03 × 1.085 = $32.58 ✓. If your answer is off by a cent, that's normal rounding — receipts are rounded to the nearest cent but the math carries more decimal places.
That covers the formula, the common errors, and the main scenarios where this comes up. The calculator at the top of this page handles all of it automatically — just put in your total and your rate. If you need to do this regularly in a spreadsheet, the Excel formula above drops straight into any column. For state-specific rates and local breakdowns, the state calculators have the right numbers pre-loaded.
Explore More Tools
All State Calculators
Find the reverse sales tax calculator for your specific state with precise local rates pre-loaded.
Sales Tax Calculator
Add sales tax to a known price. The forward version — start with a pre-tax price, get the total.
Tax Guides
In-depth guides on sales tax rules, exemptions, and how state and local rates layer together.
VAT Calculator
Remove VAT from a UK or EU price, or add it to a net amount. Same formula, international context.