Reverse mode is the one people search for when filing expenses or reconciling invoices, because tax is applied to the net amount - not simply subtracted from the gross. Enter your local rate (state plus county plus city where applicable) and the tool does the rest. For other percentage maths, see the Percentage Calculator.
Calculator
Formula used
Net = Gross / (1 + rate) · Tax = Gross − Net
How to use the Sales Tax Calculator
- Choose whether you want to add tax or remove tax from a total.
- Enter the amount - net price or receipt total.
- Type your combined sales tax rate.
- Read the net price, tax amount and total.
About this tool
The Sales Tax Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Finding the pre-tax price on a receipt.
- Calculating the tax due on an invoice.
- Reconciling expenses for a tax return.
- Checking whether a quoted price includes VAT.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Why is reverse tax not just "total minus rate%"?
Because the tax was calculated on the net price, not on the total. Dividing by (1 + rate) is the correct way to back it out.
Can I use it for VAT or GST?
Yes. Any single-rate consumption tax works the same way - enter the VAT or GST percentage and use the same two modes.
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