Australia GST calculator
Calculate Australian 10% GST on net prices or reverse-calculate GST using the ATO 1/11th rule for BAS reporting and invoices.
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About this tool
Calculate Australian Goods and Services Tax (GST). Add 10% GST to quotes or reverse-calculate (divide by 11) to extract the GST portion from a gross receipt for your quarterly Business Activity Statement (BAS).
How to use it
- 1 Select whether to add 10% GST or reverse-calculate GST from a gross price.
- 2 Enter the dollar amount in Australian dollars ($ AUD).
- 3 Review net subtotal, 10% GST component (BAS 1A), and gross total (BAS G1).
Questions
How do I calculate GST on an Australian invoice?
To add GST, multiply the pre-tax price by 0.10. To find the GST already included in a total price, divide the total by 11.
Which sales are GST-free in Australia?
Most basic foods, some medical and educational services, and export sales are GST-free under Australian tax law.
Is my data uploaded?
No. This tool runs in your browser, so your text and files never reach our server.
Is this tool free?
Yes. It’s free to use with no sign-up and no limits for normal use.
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