Sales Tax Calculator
Add sales tax to a price or extract it from a total.
Use this sales tax calculator to find the tax on a sale, or to work backwards from a tax-inclusive total to the original price. It works for any rate, including combined state and local rates in the US and GST, HST, PST or QST in Canada.
Sales tax rates change and depend on where the buyer is located, what is sold and whether you are registered to collect tax. Always confirm the rate with your tax authority.
Formula
Adding tax: Tax = Price × Rate; Total = Price + TaxRemoving tax: Price = Total ÷ (1 + Rate); Tax = Total − Price
Example
A $100 sale at 8.25% has $8.25 of tax for a $108.25 total. Removing 13% HST from $113 gives a $100 pre-tax price.
Frequently asked questions
How do I calculate sales tax backwards?
Divide the total by 1 plus the tax rate as a decimal. For 13% that is total ÷ 1.13. The difference between the total and that result is the tax.
Do I charge sales tax on services?
Some US states tax many services while others tax very few. In Canada, GST/HST generally applies to most services. Check the rules where your customer is located.
Can I add two taxes such as GST and PST?
Yes. Add the rates together when both apply to the same price (5% + 7% = 12%), or use our invoice generator which lists each tax separately on the invoice.