TopToolsAiCalculate Australia's GST (10%) on an amount — either adding it on top of a price or working out how much GST is already included in a total. AUD 220 with 10% GST included breaks down to AUD 200 net and AUD 20 GST — since Australia's GST is a flat, single rate, the maths stays simple regardless of the product category.
Last updated: 2 Sep 2026
How to use Australia GST Calculator
- Enter the amount.
- Choose "Add 10% GST" or "Extract from total".
- Click "Calculate" to see the net, GST and total amounts.
Frequently asked questions
Is GST charged on everything in Australia?
Most goods and services are taxed at 10%, though some items like basic food, health and education are GST-free.
What's the difference between adding and extracting GST?
"Adding" assumes your amount is before tax and adds 10% on top. "Extracting" assumes GST is already included and works out how much of the total is tax.
Do small businesses need to register for GST?
Businesses with an annual turnover above the ATO's registration threshold must register for GST; below that, registration is optional.
Can a registered business claim back GST it pays?
Yes — GST-registered businesses can generally claim input tax credits for GST paid on business purchases, offsetting it against GST collected on sales.
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