Interactive calculator
GST calculator
Add or extract the standard 10% GST on a taxable Australian sale.
Last reviewed 1 October 2026
Illustrative result
- Price excluding GST
- $1,000
- GST
- $100
- Price including GST
- $1,100
The calculation applies only to a fully taxable sale at the standard 10% GST rate.
How to use this tool
For a fully taxable sale, GST is 10% of the GST-exclusive amount or 1/11 of a GST-inclusive amount.
A simple example
$1,100 including GST contains $100 GST and $1,000 before GST.
Assumptions and limits
Only for fully taxable sales at the standard rate. GST-free, input-taxed and mixed supplies need different treatment; ask a registered tax or BAS agent.
General information only. Check your own records and speak with a qualified professional where the decision depends on accounting, tax, legal or financial advice.