Add sales tax to a price, or work backwards from a receipt total to the price before tax.
Formulas
- Add tax: total = price × (1 + rate ÷ 100). $100 at 7.25% = $107.25.
- Remove tax: price = total ÷ (1 + rate ÷ 100). $107.25 at 7.25% = $100.
Sales tax in the US
There is no national sales tax. Each state sets a base rate and many counties and cities add their own, so the combined rate can go from 0% (Oregon, Montana, New Hampshire, Delaware) to more than 10% in some cities. Groceries are taxed at a lower rate or not at all in many states. Check your receipt or your state's revenue department for the exact rate.
Frequently asked questions
How do I calculate sales tax backwards?
Divide the total by 1 plus the rate as a decimal. With 8%: total ÷ 1.08.
Which states have no sales tax?
Alaska (state level), Delaware, Montana, New Hampshire and Oregon.
Is sales tax charged on tips?
Generally no, a voluntary tip is not taxed; mandatory service charges often are.
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