How to Remove GST from a Price in Australia
To remove standard 10% GST from a fully taxable GST-inclusive price, divide the total by 1.1. To isolate the GST portion, divide the total by 11. For a $220 total, that is $200 before GST plus $20 GST.
Use the right formula for a GST-inclusive total
A GST-inclusive price already contains the tax. Because 10% is calculated on the pre-GST price, GST is one-eleventh of a fully taxable GST-inclusive total—not 10% of that total.
- Price before GST: total ÷ 1.1
- GST component: total ÷ 11
Example: $220 ÷ 1.1 = $200 before GST. $220 ÷ 11 = $20 GST.
A quick way to check an invoice amount
Select “Extract GST from a GST-inclusive total” in the Australian GST calculator, then enter the total. The result shows the estimated before-GST amount and GST component. It is useful for a quick check, but it does not replace a correctly prepared tax invoice or your accounting records.
Check the tax treatment before relying on the split
The divide-by-11 shortcut assumes the amount is fully taxable at the standard 10% rate. A mixed supply, GST-free item, input-taxed item or special scheme may need a different treatment. The ATO GST guide explains the standard rate and common supply categories.
Try the related calculator
Use the Australian GST calculator to apply the formula to your own figures. Results are estimates using the assumptions shown on the tool page.
Frequently asked questions
Is GST 10% of the GST-inclusive price?
No. For a fully taxable sale at the standard rate, the GST component is one-eleventh of the GST-inclusive total. The 10% rate applies to the pre-GST value.
What is the GST in a $110 total?
If the full $110 is taxable at the standard rate, the GST component is $10 and the pre-GST amount is $100.
Can I use this to prepare my BAS?
Use it as a basic calculation check only. BAS reporting and GST credits depend on your records and circumstances; follow ATO guidance or get professional advice.