Australian GST Calculator
Add 10% GST to a price, or find the GST already included in a total — instantly, with a full breakdown.
- Australian GST rate: 10%
- Add & remove GST
- Since 1 July 2000
"Add" treats your amount as GST-exclusive; "Remove" treats it as GST-inclusive.
Total including GST
- 90.9% Amount (ex GST) $100.00
- 9.1% GST (10%) $10.00
- Amount (ex GST)
- $100.00
- GST
- $10.00
- Total (inc GST)
- $110.00
How this is calculated
Australian GST is a flat 10% added to the price of most goods and services.
To add GST: multiply the GST-exclusive amount by 1.1. The GST is 10% of the original amount.
To remove GST: divide the GST-inclusive total by 11 to get the GST component, or by 1.1 to get the price before GST.
Assumptions & notes
- Australian GST has been a flat 10% since 1 July 2000. Some goods and services are GST-free (e.g. most basic food, some health and education) or input-taxed; this calculator assumes the standard 10% applies.
Official sources
Disclaimer: This calculator provides estimates only and is not financial, tax, or legal advice. Figures are general in nature and may not reflect your circumstances. Verify against official sources or a qualified adviser before making decisions.
Frequently asked questions
How do I add GST to a price? +
Multiply the GST-exclusive amount by 1.1. For example, $100 plus 10% GST becomes $110, of which $10 is GST. Use the 'Add GST' mode above.
How do I work out the GST included in a price? +
Divide the GST-inclusive amount by 11 to get the GST component, or divide by 1.1 to get the GST-exclusive price. For example, a $110 total contains $10 of GST and $100 ex-GST. Use the 'Remove GST' mode above.
What is the GST rate in Australia? +
GST is a flat 10% and has been since it was introduced on 1 July 2000.
Is everything subject to GST? +
No. Some items are GST-free (such as most basic food, and certain health, education and childcare services) and some are input-taxed. This tool assumes the standard 10% rate applies.
Are these figures exact? +
The maths is exact for a standard 10% rate, but individual invoices may round GST to the nearest cent per line item. Always check the tax invoice for the definitive amount.