KNOW THE MATH
How it works
Use this calculator for mathematical tax additions or reverse calculations. You must supply the correct applicable rate and taxable amount yourself. It does not check exemptions, jurisdictions, or rounding requirements.
Formula
If inclusive: net = gross ÷ (1 + rate). If exclusive: gross = net × (1 + rate). Tax = gross − net.
Worked example
If 120 includes 20% VAT, the net amount is 100 and the tax is 20.