Free GST Calculator Australia
Use this GST calculator to add 10% GST to a price, or to find the GST included in a price. Australia's GST rate is 10%.
GST calculator formulas
- Add GST: price × 1.1 (GST = price × 0.1)
- GST included in a price: price ÷ 11
- Price excluding GST: price ÷ 1.1
Quick GST table
| Amount | GST to add | Total incl. GST | GST included if amount is GST-inclusive |
|---|---|---|---|
| $10 | $1.00 | $11.00 | $0.91 |
| $50 | $5.00 | $55.00 | $4.55 |
| $100 | $10.00 | $110.00 | $9.09 |
| $250 | $25.00 | $275.00 | $22.73 |
| $500 | $50.00 | $550.00 | $45.45 |
| $1,000 | $100.00 | $1,100.00 | $90.91 |
| $5,000 | $500.00 | $5,500.00 | $454.55 |
| $10,000 | $1,000.00 | $11,000.00 | $909.09 |
GST examples, step by step
- Sending an invoice: your fee is $1,500 before GST. GST is $1,500 × 0.1 = $150.00, so the invoice total is $1,650.00.
- Checking a receipt: you paid $88 including GST. The GST is $88 ÷ 11 = $8.00, and the price before GST was $80.00.
- Comparing quotes: one tradie quotes $4,400 including GST and another $4,100 plus GST. The second is really $4,510.00, so the first quote is cheaper.
GST and your BAS
A GST-registered business adds up the GST it charged on its sales and takes off the GST credits for the GST included in its business purchases. It reports both on its business activity statement (BAS), monthly, quarterly or yearly, and pays the difference to the ATO, or gets a refund if its credits are larger. Keep a tax invoice for any purchase over $82.50 including GST to claim the credit.
Registering for GST
A business must register for GST when its annual GST turnover reaches $75,000 ($150,000 for non-profit organisations). Taxi and ride-sourcing drivers must register regardless of turnover. Registered businesses include GST in their prices and claim GST credits for the GST in their business purchases.
Frequently asked questions
How do I use the GST calculator?
Choose "Add GST" if your price excludes GST, or "Remove GST" if it already includes GST, then type the price. The GST calculator shows the GST amount and both prices instantly.
How do I add GST to a price?
Multiply the price by 1.1. For example, $200 plus GST is $200 × 1.1 = $220, of which $20 is GST.
How do I work out the GST in a price that includes GST?
Divide the GST-inclusive price by 11. For example, a $220 price includes $220 ÷ 11 = $20 GST. The price excluding GST is $220 ÷ 1.1 = $200.
Why is GST not 10% of the total price?
GST is 10% of the price before GST. On a GST-inclusive price it is one eleventh (about 9.09%), because the total is 110% of the ex-GST price.
Which items are GST-free?
Most basic food, some medical and health services, some education courses and childcare, exports and some other items are GST-free. The ATO lists them in its GST-free sales guidance.