VAT Calculator: Add or Remove VAT and Sales Tax

VAT and Sales Tax Calculator works in both directions, which is the part people get wrong. Adding tax is easy arithmetic. Removing it is not: to get the net price out of a gross one you divide by one plus the rate, rather than subtracting the percentage, and subtracting instead gives an answer that is always slightly too low.

Enter a rate and a price, choose whether the price you entered already includes tax, and the tool shows the net amount, the tax amount and the gross total as three separate lines. Seeing all three is what makes an invoice check quick, because those are exactly the three figures an invoice has to agree on.

A quick-rate row covers the common rates so you do not have to remember them, and any rate can be typed in. The arithmetic is the same whether your local tax is called VAT, GST or sales tax; only the name and the rate change.

• Adds tax to a net price and removes it from a gross one
• Correct reverse calculation, not a naive subtraction
• Quick buttons for common rates plus any custom rate
• Net, tax and gross shown as three separate lines
• Works for VAT, GST and sales tax alike
• Rejects impossible rates with a clear message
• Copy the breakdown

The vat and sales tax calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

• Checking that an invoice adds up before paying it
• Pricing a product so the gross figure lands on a round number
• Working out how much tax is inside a receipt total
• Quoting a client a price excluding tax
• Reconciling expenses where some totals include tax and others do not