Sales Tax Calculator

Enter a price and your tax rate. Choose whether to add tax to a net price or remove it from a gross (tax-inclusive) price.

Sales tax / VAT

Price including tax121.00
Tax amount
21.00

Working

  1. Tax = 100.00 × 21 ÷ 100 = 21.00
  2. Total = 100.00 + 21.00 = 121.00

Formulas

adding: gross = net × (1 + rate ÷ 100)

removing: net = gross ÷ (1 + rate ÷ 100)

tax included = gross − net

Worked examples

Add 21% VAT to 100

  1. 100 × 1.21 = 121

Gross price 121; tax 21.

Remove 21% VAT from 121

  1. 121 ÷ 1.21 = 100
  2. Tax included: 121 − 100 = 21

Net price 100.

The common mistake

Taking 21% off 121 gives 95.59, not 100. Tax is a percentage of the pre-tax price, so to remove it you divide by 1.21 rather than subtracting 21%.