Australia GST calculator (1/11th rule)
Calculate Australian 10% GST or extract 1/11th GST from gross receipts for your quarterly BAS statement. Fast and free.
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About this tool
Quickly extract the GST portion from any gross invoice total by dividing by 11, or add 10% GST to any wholesale quote.
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 does the 1/11th GST formula work?
Because Australian GST is 10%, a price with GST is 110% of the pre-tax price. The tax component is exactly 10/110ths, or 1/11th of the total price.
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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