Sales Tax & VAT Calculator

Adding and removing tax

To add tax, multiply the price by (1 + rate). To remove tax from a tax-inclusive price, divide by (1 + rate). Do not subtract the percentage directly, as that gives the wrong answer.

Common rates

UK VAT is 20%. Canadian GST is 5% plus provincial tax. Australian GST is 10%. US sales tax varies by state and city. Enter the rate that applies to you.

Worked example

Last reviewed November 2026. Formulas are standard and shown in the sections above; results are estimates.

Tips and common mistakes

• Check if prices on a site are shown with or without tax.
• Some goods are zero-rated or exempt.
• Keep records if you reclaim VAT or GST for business.