GST Calculator Australia
Add 10% GST to a net price or remove GST from an inclusive total. Free, no sign-up, runs entirely in your browser.
Australian GST is a flat 10% on most goods and services.
Figures rounded to 2 decimals (cents). Verify GST-free and input-taxed treatment against current ATO guidance.
How to add or remove GST in Australia
Australian GST is a flat 10%. To add GST to a net price, multiply by 1.1: an A$100 quote becomes A$110 including GST. To remove GST from a price that already includes it, divide by 1.1: A$110 ÷ 1.1 = A$100 net, with A$10 of GST.
A handy cross-check: the GST component of a GST-inclusive price is exactly one-eleventh of the total. On A$220 inclusive, the GST is A$20. This is the same fraction the ATO uses when working out GST from a total on an activity statement.
Some supplies are GST-free, including most basic food, health and medical services, education and childcare, and exports; others such as residential rent and financial supplies are input-taxed. Businesses must register for GST, using their ABN, once GST turnover reaches A$75,000 in any 12-month period (A$150,000 for non-profits).
Frequently asked questions
What is the GST rate in Australia?
A single flat rate of 10% applies to most goods and services. It has been 10% since GST began on 1 July 2000.
How do I remove GST from an inclusive price?
Divide by 1.1: A$110 ÷ 1.1 = A$100 net and A$10 GST. The GST portion of an inclusive price is exactly one-eleventh of the total. Switch this calculator to "Remove GST" mode to do it in one step.
Which items are GST-free?
Most basic food, health and medical services, education courses, childcare and exports are GST-free. GST-free sales still count towards the A$75,000 registration threshold, and registered businesses can claim GST credits on related purchases.
When do I need to register for GST?
Within 21 days of your GST turnover reaching A$75,000 in any 12-month period, current or projected (A$150,000 for non-profits). You need an ABN to register, and taxi or ride-sourcing drivers must register regardless of turnover.
Is this GST calculator free?
Yes. Free, no sign-up, and every calculation runs locally in your browser. Nothing you type is uploaded.