Australia GST Calculator
Calculate tax on a tax-exclusive amount or extract tax from a tax-inclusive amount.
How to interpret this estimate
Australia GST Calculator
Enter the amount in the currency shown and choose whether it includes tax. Use the tax-exclusive option to add tax, or the tax-inclusive option to separate the tax from the gross amount. The standard rate does not apply to every supply; check whether GST-free, input-taxed or other special treatment applies.
For a tax-exclusive amount, tax equals the amount multiplied by 10 / 100. For a tax-inclusive amount, divide by (1 + 10 / 100) to find the net amount; tax is gross minus net. For example, at this tool's standard rate, an exclusive amount of 100 has tax of 10 and gross of 110. This illustrates arithmetic, not whether the standard rate applies to a supply.
Read the official source for this tool. Use the linked official sources to confirm the applicable period and eligibility before filing.
Interface update: 25 October 2026 — retained form values, result context and accessible validation. This update does not revise the underlying tax rules.
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