Add tax to a price, or remove tax to find the original pre-tax amount — works for GST, VAT, or any sales tax rate.
| Country | Tax Type | Standard Rate |
|---|---|---|
| New Zealand | GST | 15% |
| Australia | GST | 10% |
| United Kingdom | VAT | 20% |
| Canada (GST only) | GST | 5% |
| Singapore | GST | 9% |
| European Union (avg) | VAT | ~21% |
Choose whether to add tax to a pre-tax price, or remove tax from a price that already includes it, then enter the amount and tax rate. The calculator instantly shows the net amount, tax amount, and gross total.
If you have a pre-tax price and need to know the final price a customer pays, use "Add Tax" — this multiplies your amount by the tax rate and adds it on top. If you have a final price that already includes tax (common on receipts) and need to know the pre-tax value for accounting purposes, use "Remove Tax" — this divides the gross amount by (1 + tax rate) to back out the original net amount.
GST (Goods and Services Tax) and VAT (Value Added Tax) work on the same underlying principle — a consumption tax added at the point of sale — and the calculation method is identical. The terminology simply differs by country: New Zealand, Australia, Canada, Singapore, and India use "GST," while the UK and most of the European Union use "VAT."
Divide the tax-inclusive (gross) amount by 1 plus the tax rate as a decimal. For example, at 15% GST, divide the gross amount by 1.15 to get the net amount. Select "Remove Tax" mode above and the calculator does this automatically.
Because the 15% tax was originally calculated on the smaller net amount, not the larger gross amount. Subtracting 15% straight from the gross price over-corrects. The correct method divides by (1 + tax rate) rather than multiplying by (1 − tax rate).
Yes. Simply enter the applicable rate for your country or region — the underlying math for adding or removing a percentage-based consumption tax is the same everywhere, regardless of what it's called locally.