Reverse Sales Tax Calculator

You have the total you paid and you need the two numbers behind it. Enter a tax-inclusive amount and get the pre-tax price and the sales tax, split so they add back exactly — by state rate, or by the combined rate printed on your receipt.

Total paid, including tax ($)

Which rate should we back out?

State

Was this a grocery purchase?

A $107.25 total at 7.250% breaks down to a pre-tax price of $100.00 plus $7.25 of sales tax.

Need to add tax to a price instead?Sales Tax Calculator

Price Before Tax

Pre-Tax Price

$100.00

Detail	Amount
Total Paid	$107.25
Rate Applied	7.250%
Sales Tax Removed	$7.25
Pre-Tax Price	$100.00

State base rate only. If the receipt was issued in a city or county that stacks a local rate on top, switch to Rate from my receipt and enter the combined rate — otherwise the tax removed here will be too small.

Sales tax

$7.25

Rate applied

7.250%

Pre-tax price

$100.00

Pre-tax price and tax are derived so they always add back to exactly the total you entered. Where a state taxes groceries at a reduced rate, that reduced rate is applied.

Edit inputs ↑

The formula, and the mistake almost everyone makes

Sales tax is applied to the pre-tax price, so the total you paid is the price multiplied by (1 + rate). Recovering the price means undoing that multiplication — dividing, not subtracting.

Correct

$107.25 ÷ 1.0725 = $100.00 pre-tax, so the tax was $107.25 − $100.00 = $7.25.

Wrong

$107.25 × 92.75% = $99.47. Off by $0.53 on a $107.25 purchase — because the 7.25% was never charged on the total, only on the price underneath it.

The gap scales with the amount. On a $30,000 vehicle at the same rate the subtraction shortcut misstates the pre-tax price by roughly $147 — enough to matter when the figure is feeding a deduction, an expense claim, or a set of books.

What $100 paid breaks down to

The same $100 tax-inclusive total, split at a range of real US rates. The pre-tax column is what actually reaches the seller.

Jurisdiction	Rate	Pre-tax price	Sales tax
Oregon state rate No state sales tax	0.00%	$100.00	$0.00
Honolulu, HI 4.0% state general excise tax + 0.5% Oahu county surcharge	4.50%	$95.69	$4.31
Florida state rate State base rate only	6.00%	$94.34	$5.66
Texas state rate State base rate only	6.25%	$94.12	$5.88
California state rate State base rate only	7.25%	$93.24	$6.76
New York City, NY 4% state + 4.5% city + 0.375% Metropolitan Commuter Transportation District	8.88%	$91.85	$8.15
Seattle, WA 6.5% state + 4.05% local	10.55%	$90.46	$9.54

City rates are combined state + local figures taken from the relevant state revenue department; they change by ordinance, usually at quarter or half-year boundaries. State rows are the statutory state rate only. Where a receipt is available, its printed rate always beats a lookup.

When you actually need this

Bookkeeping and expense reports

Accounting systems post the net expense and the tax to separate accounts, but receipts and card statements often show only the gross. Backing the tax out is the step between the two — and the reason the split must reconcile to the cent.

Business deductions on Schedule C

Sales tax paid on a deductible business purchase is generally part of the deductible cost of that item, so the split matters less for the total — but it matters for asset basis, where the tax is capitalised into the asset rather than expensed.

Big-ticket purchases and the SALT election

If you elect to deduct sales tax instead of income tax on Schedule A, documented tax on vehicles, boats, and major renovation materials is added on top of the IRS baseline table amount. Backing it out of the out-the-door price establishes that figure.

Resale and pricing

Setting a shelf price that lands on a round tax-inclusive number — a $20.00 out-the-door item — means solving backwards from the total to the price you enter into the register.

Worked state examples

State base rates only — add local rates where they apply.

State	Total paid	Rate	Pre-tax price	Tax
Texas	$106.25	6.25%	$100.00	$6.25
New York	$104.00	4.00%	$100.00	$4.00
Florida	$106.00	6.00%	$100.00	$6.00
Illinois	$106.25	6.25%	$100.00	$6.25

Frequently asked questions

How do you calculate reverse sales tax?

Divide the tax-inclusive total by 1 plus the tax rate expressed as a decimal. Pre-tax price = total / (1 + rate). The tax is then the remainder: total - pre-tax price. For a $107.25 total at California's 7.25% state rate, $107.25 / 1.0725 = $100.00 pre-tax, leaving $7.25 of tax.

Why can't I just subtract the tax rate from the total?

Because the rate was applied to the SMALLER pre-tax figure, not to the total. Multiplying $107.25 by 92.75% gives $99.47 — that is $0.53 off the correct $100.00. The error grows with both the rate and the amount, so it matters most on the large purchases where people are most likely to check.

My receipt shows a higher rate than this calculator's state rate. Why?

The state dropdown applies the STATE base rate only. 38 states let cities, counties, and transit districts stack their own sales tax on top, so a real receipt from Chicago (10.25%) or Seattle (10.35%) carries a much higher combined rate than the state figure. Switch the calculator to "Rate from my receipt" and enter the combined rate printed on the receipt — that is the only way to reproduce the exact split.

What if I don't know the rate that was charged?

If the receipt shows both the total and the tax, you can derive the rate yourself: rate = tax / (total - tax). A receipt showing $107.25 total with $7.25 tax implies $7.25 / $100.00 = 7.25%. If the receipt shows neither, use the state rate here as a floor and expect the true figure to be higher wherever local taxes apply.

Do the pre-tax price and the tax always add back to the total?

They do here. Rounding the price and the tax independently can leave them a cent short of the total, which is exactly the kind of discrepancy that makes an expense report or a bookkeeping entry fail reconciliation. This calculator rounds the pre-tax price and then derives the tax as the remainder, so the two figures always sum to the amount you entered.

Does this work for groceries?

Yes. Most states exempt unprepared groceries entirely, in which case there is no tax to back out and the total is the pre-tax price. A handful tax groceries at a reduced rate — Alabama, Arkansas, Illinois, Mississippi, Missouri, Tennessee, Utah, and Virginia — and three tax them at the full state rate: Hawaii, Idaho, and South Dakota. Set the grocery toggle and the calculator applies the correct reduced or full rate for the state you picked.

Can I use this to work out a sales tax deduction?

Only as an input, not as the answer. Itemizers may elect to deduct state and local SALES tax instead of state INCOME tax on Schedule A under IRC §164(b)(5)(A), but the deductible amount is not simply the tax on your receipts — the IRS computes a baseline from your state, AGI, and household size using its Sales Tax Deduction Calculator, and you add documented big-ticket purchases (vehicles, boats, major renovation materials) on top. Backing the tax out of a car purchase total is a legitimate way to establish that add-on figure.

Is this the same as a VAT-exclusive calculation?

The arithmetic is identical — divide by 1 plus the rate — but the tax is not. US sales tax is a single-stage retail tax collected only at the final consumer sale, whereas VAT is collected at each stage of production with credits for tax already paid. If you are reconciling a non-US invoice, the formula here still works, but the rate and the recovery rules are governed by that country's VAT system.

Reverse Sales Tax Calculator

The formula, and the mistake almost everyone makes

What $100 paid breaks down to

When you actually need this

Bookkeeping and expense reports

Business deductions on Schedule C

Big-ticket purchases and the SALT election

Resale and pricing

Worked state examples

Frequently asked questions

Sources

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