Working it out
- Adding GST: price × 1.1
- Removing GST: price ÷ 1.1
- The GST in a GST-inclusive price: price ÷ 11
A tax invoice shows the GST as exactly one eleventh of the total price, when every item on it includes GST.
GST Calculator
Add 10% GST to a price, or work out how much GST is in a price that already includes it.
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10% applies to most goods and services; most basic food and some health, education and childcare are GST-free.
Price with GST
$110.00
GST at 10%: $10.00
- GST amount
- $10.00
- Price before GST
- $100.00
What this means
GST adds $10.00 to every $100.00 you spend. It’s the same rate whatever you earn, so it takes a bigger share of a smaller income.
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Breakdown
| Price before GST | $100.00 |
| GST (10%) | $10.00 |
| Price with GST | $110.00 |
Quick GST sums at 10%
- Add GST: multiply the price by 1.1.
- Remove GST: divide the price by 1.1.
- GST in a price that includes it: 1/11 of the price.
Assumptions in this estimate
- Businesses must register for GST once their GST turnover reaches $75,000 a year ($150,000 for non-profits). Taxi and ride-sourcing drivers must register whatever their turnover.
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Frequently asked questions
How do I add GST to a price?
Multiply the price by 1.1. So $100 becomes $110.
How do I work out the GST in a price?
Divide the GST-inclusive price by 11. So a $110 price includes $10 of GST, and $100 before GST. Don't just take 10% off, which would give $99, because GST is 10% of the price before GST, not of the total.
What is GST-free?
Some things have no GST, such as most basic food, some education courses, some medical, health and care products and services, and some childcare.
When does a business have to register for GST?
Once its GST turnover reaches $75,000 a year, or $150,000 for non-profits. Taxi and ride-sourcing drivers must register whatever their turnover.