Reverse sales tax calculator

It works backwards from a total you have already paid. A normal sales tax calculator starts with a price and adds tax; a reverse one starts with the receipt total and separates it back into the price before tax and the tax itself. Useful for expense claims, bookkeeping, and any time the receipt shows only the total.

Divide the total by one plus the rate, then subtract. At 7%, a $107.00 total is $100.00 before tax and $7.00 of tax. Written out: $107.00 ÷ 1.07 = $100.00.

Because the percentage was charged on the smaller number. Taking 7% off $107.00 gives $99.51, which is $0.49 short of the real price. The error grows with the rate, and it is the single most common mistake in backing tax out of a total.

Yes. Enter your local rate alongside the state rate and the extraction runs on the combined figure, then splits the tax back into a state share and a local share in proportion. Backing them out separately would round twice and leave a cent belonging to neither.

18 so far: California, Tennessee, Washington, Texas, Florida, North Carolina, Wyoming, South Dakota, New York, Pennsylvania, Illinois, Ohio, New Jersey, Nevada, Colorado, Arizona, Indiana, Maryland. More are on the way. If yours is not here yet, pick any state and type your own combined rate into the local field — the arithmetic is the same.