VAT / GST Calculator
Choose add or remove, enter the amount and tax rate, and the net, tax and gross figures update instantly. Removing tax divides by (1 + rate) rather than subtracting the rate, which is the common mistake.
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Formulas
Add: tax = net × rate; gross = net + tax. Remove: net = gross ÷ (1 + rate); tax = gross − net.
Limits
Rounding rules for invoices differ by country (per line or per total). Rates are not looked up for you; check your local rate.
Common questions
Is VAT the same as GST?
Both are consumption taxes calculated the same way here; names and rates differ by country.
Can I use 0%?
Yes; net and gross will be equal.
Methodology reviewed 2026-10-27. Processing details and test approach.