Australian GST Calculator
Add 10% GST to a price, or split a GST-inclusive total back into the base price and the tax. Results update as you type.
The divide-by-11 rule
Australia's GST has one rate, 10%, which makes the arithmetic friendlier than most VAT systems. Going forward, multiply by 1.1. Going backward, divide the total by 11 to get the GST amount: a $220 quote contains $20 of GST and $200 net. People sometimes divide by 10 instead, which overstates the GST; the tax was 10% of the net price, and the net price is the smaller number.
Australian consumer prices must be displayed GST-inclusive, so what you see on the tag is what you pay. On invoices between registered businesses the GST is itemised separately, which is where this calculator earns its keep.
Frequently asked questions
How do I work out the GST in a price?
Divide the GST-inclusive price by 11. A $110 total contains $10 of GST, leaving $100 net. This is the method the ATO itself describes, and it works because 10% GST makes the gross price 11/10 of the net.
How do I add GST to a price?
Multiply the GST-exclusive price by 1.1, or take 10% and add it on. A $100 net price becomes $110 including GST.
What is GST-free in Australia?
Most basic food (bread, milk, fruit, vegetables, plain meat), many health and medical services, some education courses, and exports. Restaurant meals, takeaway, and processed snacks are taxed at the full 10%.
When does a business need to register for GST?
When GST turnover reaches $75,000 a year, or $150,000 for non-profits. Taxi and ride-share drivers must register from the first dollar regardless of turnover.
Has the GST rate ever changed?
No. It has been 10% since GST was introduced on 1 July 2000. Changing it requires the agreement of all states and territories, which is why proposals to raise it keep going nowhere.
Looking for another country? Try the worldwide VAT calculator or the Canadian GST/HST calculator.