Work out GST at the standard 10% rate. Enter an amount, choose whether it already includes GST, and get an instant breakdown.
Australia's Goods and Services Tax is a flat 10% added to most goods and services. There are two common situations, and the formula is different for each.
If you have a price before tax and need to add GST, multiply by 1.1.
Example: A $100 item becomes $110 once GST is added. The GST component is $10.
If you have a total that already includes GST and need to know how much of it is tax, divide by 11.
Example: A $110 total includes $10 of GST ($110 ÷ 11 = $10), and the underlying price before tax was $100.
| To find | Formula |
|---|---|
| GST amount from a GST-exclusive price | Price × 0.10 |
| Total price including GST | Price × 1.1 |
| GST amount within a GST-inclusive total | Total ÷ 11 |
| Net price with GST removed | Total ÷ 1.1 |
Not every sale in Australia is subject to GST. Some goods and services are GST-free — most basic food, many medical and health services, and some education courses among them. Others are input-taxed, such as residential rent and some financial services, which works differently again.
This calculator uses the standard 10% rate that applies to most everyday transactions. If you're not sure whether GST applies to what you're selling, the ATO's own guidance is the authoritative source to check.
BizFlare calculates GST automatically on every invoice and quote — no manual maths.