Sales Tax Calculator
Add sales tax to a price before tax, or take the tax back out of a price that already includes it. Enter the price and your combined state and local rate. The calculator shows the price before tax, the tax amount and the price after tax, each rounded to the cent.
How to use the Sales Tax Calculator
- Enter your numbers in the Sales Tax Calculator above.
- Press the Calculate button to see the result.
- To try other numbers, change any value and press the button again.
The sales tax formulas
Add tax: After tax = Price × (1 + r) · · · Remove tax: Before tax = After tax / (1 + r)
r is the combined sales tax rate as a decimal, so 8.25% is 0.0825. In Remove Tax from Price mode the tax is the after-tax price minus the price before tax: Tax = Total − Total/(1 + r).
Worked example
A $129.99 item at 8.25% sales tax: total = 129.99 × 1.0825 = $140.71; tax alone = $10.72. Going the other direction, a $50.00 receipt at the same rate had a pre-tax price of 50.00 / 1.0825 ≈ $46.19 and $3.81 of tax.
Frequently asked questions
What states have no sales tax?
Alaska, Delaware, Montana, New Hampshire and Oregon have no statewide sales tax, and of those only Alaska lets local governments charge one. In the Tax Foundation's 2026 midyear table the other state rates run from 2.9% in Colorado to 7.25% in California. Local sales taxes are allowed in 38 states, Alaska among them. Enter the combined rate for the place of sale.
Are services taxed?
That depends on the state and the service, and the calculator does not know your state's rules. It applies the rate you enter to the whole price you enter, so leave out anything your state does not tax.
What about online purchases?
In South Dakota v. Wayfair (2018), the Supreme Court dropped the rule that a seller needed a physical presence in a state before the state could make it collect sales tax. States can now require online sellers to collect tax on sales to their residents.