Adding tax
Start with the price before GST or VAT.
Multiply the before-tax amount by the tax rate to find the tax component, then add the two amounts. A 10% rate adds $10 to a $100 before-tax price.
Free GST/VAT calculator
Add or remove GST or VAT from a price.
Enter an amount and tax rate to separate the before-tax amount, tax component and tax-inclusive total.
$ is a display symbol only. Use the same currency for all amounts; no currency conversion is performed.
Choose the rate that applies to your transaction and jurisdiction. This calculator does not determine whether an item is taxable or whether you must register.
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Removing tax
Do not subtract the percentage from the inclusive total.
A tax-inclusive amount already contains tax as a fraction of the final price. Divide by one plus the tax rate to recover the before-tax amount accurately.
Check local rules
The formula cannot classify the transaction.
Registration thresholds, exemptions, zero-rated supplies, filing periods and invoice requirements vary. Confirm the correct treatment with the relevant authority or adviser.