GST calculator for Australia
Add 10% GST to a price, or find out how much GST is included in a total. Handy for quotes, invoices and checking supplier bills.
- Excluding GST
- $1,000.00
- GST (10%)
- $100.00
- Including GST
- $1,100.00
Adding GST: multiply by 1.1 (GST is 10% of the price).
GST formulas at a glance
| You want to… | Formula | Example |
|---|---|---|
| Add GST | Price × 1.1 | $500 → $550 |
| Find the GST to add | Price × 0.1 | $500 → $50 |
| Find the GST in a total | Total ÷ 11 | $1,100 → $100 |
| Remove GST | Total ÷ 1.1 | $1,100 → $1,000 |
Common questions
How do I add GST to a price?
Multiply the price by 1.1. For example, $500 plus GST is $550, and the GST is $50.
How do I work out the GST in a total?
Divide the GST-inclusive total by 11. For example, $1,100 includes $100 GST.
How do I remove GST from a price?
Divide the GST-inclusive price by 1.1. For example, $1,100 ÷ 1.1 = $1,000 before GST.
Do I have to charge GST?
You must register for GST when your business’s GST turnover reaches $75,000 a year. If you are not registered, you don’t charge GST. Check the ATO website or ask your accountant.
General information only, not tax advice. Some sales are GST-free or input-taxed. Check the ATO website or ask your accountant.
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