Sales Tax / GST / VAT Calculator

Whether it is called sales tax, GST or VAT, the arithmetic is the same. This calculator adds tax to a price before tax, takes tax back out of a price that already includes it, and works out which rate was used when you know both prices. A common mistake is removing tax by subtracting the percentage from the gross price; this tool does it the correct way.

How to use Sales Tax / GST / VAT Calculator

1. Choose Add tax, Remove tax or Find the rate.
2. Enter the price and the tax rate (for example 17 for 17%).
3. Read the net price, the tax amount and the gross price.

When it comes in handy

• Writing quotes and invoices that show tax separately.
• Finding the pre-tax price of something you bought, for expense claims.
• Checking the tax on a receipt.

Frequently asked questions

How do I remove tax from a price?

Divide the gross price by 1 plus the rate. With 17% tax, 117 ÷ 1.17 = 100, so the tax is 17. Subtracting 17% of 117 would give the wrong answer (97.11).

Which rate should I use?

It depends on your country, state or province and on the product. Check your tax authority's website for the current rate; rates and exemptions change.