About the Australia GST Calculator
Australia’s Goods and Services Tax (GST) has been charged at a flat 10% since it was introduced on 1 July 2000. Unlike the United States, where sales tax is added at the till, Australian businesses must show prices to consumers with GST already included. That makes the most common question "how much of this price is GST?" — and the answer is always one-eleventh of the total. This calculator does it instantly, or adds GST to a price for your quotes and invoices.
How to use the Australia GST Calculator
- Choose "Add GST" for a price that excludes GST, or "Remove GST" for a GST-inclusive total.
- Enter the amount in dollars.
- Read the GST-exclusive price, the GST amount and the GST-inclusive total.
The formula behind it
GST at common prices: add 10% or take out 1/11
Left: adding 10% GST to a GST-exclusive price. Right: the GST inside the same amount if it already includes GST.
| Amount | GST to add (10%) | Total incl. GST (× 1.1) | GST inside the amount (÷ 11) | Price before GST |
|---|---|---|---|---|
| $10 | $1.00 | $11.00 | $0.91 | $9.09 |
| $50 | $5.00 | $55.00 | $4.55 | $45.45 |
| $100 | $10.00 | $110.00 | $9.09 | $90.91 |
| $250 | $25.00 | $275.00 | $22.73 | $227.27 |
| $500 | $50.00 | $550.00 | $45.45 | $454.55 |
| $1,000 | $100.00 | $1,100.00 | $90.91 | $909.09 |
| $2,500 | $250.00 | $2,750.00 | $227.27 | $2,272.73 |
The 1/11 rule explained
Because GST is 10% of the GST-exclusive price, the GST-inclusive price is 110% of it. The GST is therefore 10/110 — one-eleventh — of the total. For a $220 receipt, the GST is $220 ÷ 11 = $20 and the price before GST is $200. Taking 10% off the total ($22) would be wrong.
What is GST-free in Australia?
Some supplies carry no GST at all. Common examples include:
- Most basic food, such as fresh fruit, vegetables, meat, bread and milk (prepared and restaurant food is taxable).
- Most medical and health services, and some medicines.
- Many education courses.
- Exports of goods and services.
- Some childcare services.
When must a business register for GST?
A business must register for GST when its GST turnover reaches $75,000 or more a year ($150,000 for non-profit organisations). Taxi and ride-sourcing drivers must register regardless of turnover. Once registered, you include GST in your prices, issue tax invoices and can claim GST credits on business purchases through your Business Activity Statement (BAS).
Examples
Quote for a client
$1,500 of work plus GST: $1,500 × 1.1 = $1,650, of which $150 is GST.
Claiming GST on a receipt
A $385 purchase includes $385 ÷ 11 = $35 of GST; the price before GST is $350.
Frequently asked questions
How do I calculate GST in Australia?
To add GST, multiply the price by 1.1. To find the GST in a GST-inclusive price, divide the total by 11.
How do I remove GST from a price?
Divide the GST-inclusive price by 1.1. For $99, that gives $90 before GST and $9 of GST.
How much is GST in Australia?
10% of the price before GST. In a GST-inclusive price, the GST is one-eleventh of the total.
Has the GST rate ever changed?
No. The rate has been 10% since GST began on 1 July 2000. Any change would require the agreement of every state and territory.
Does this work for New Zealand GST?
No — New Zealand’s GST rate is 15%. Use our New Zealand GST calculator instead.
Sources
About the author: Ahmed Bilal
Ahmed Bilal is the founder of VolexTool and builds and maintains every calculator on the site. Tax rates and thresholds are taken directly from official sources such as GOV.UK, HMRC, the Canada Revenue Agency and the Australian Taxation Office, the formula is shown on every page, and each update must pass more than 600 automated checks before it goes live. Ahmed is not a tax adviser: for decisions about your own situation, speak to a qualified accountant or financial adviser.