Free planning tool
GST calculator
Add or remove 10% GST and see the GST component.
How the calculation works
For a fully taxable sale at 10%, multiply the GST-exclusive amount by 1.1 to add GST. Divide a GST-inclusive amount by 11 to find the GST component. This tool does not determine whether a transaction is taxable, GST-free or input-taxed.
Official guidance: ASIC Moneysmart: GST calculator ↗
Rules checked 26 September 2026. Confirm current requirements before relying on a result.
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