Working it out
- Adding GST: price × 1.15
- Removing GST: price ÷ 1.15
- The GST in a GST-inclusive price: price × 3 ÷ 23
The calculator rounds to the cent.
GST Calculator
Add 15% GST to a price, or work out how much GST is in a price that already includes it.
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15% applies to most goods and services; residential rent and financial services such as interest are exempt.
Price with GST
$115.00
GST at 15%: $15.00
- GST amount
- $15.00
- Price before GST
- $100.00
What this means
GST adds $15.00 to every $100.00 you spend. It’s the same rate whatever you earn, so it takes a bigger share of a smaller income.
Next step
Breakdown
| Price before GST | $100.00 |
| GST (15%) | $15.00 |
| Price with GST | $115.00 |
Quick GST sums at 15%
- Add GST: multiply the price by 1.15.
- Remove GST: divide the price by 1.15.
- GST in a price that includes it: 3/23 of the price.
Assumptions in this estimate
- Businesses must register for GST once their turnover reaches $60,000 in 12 months, or is expected to.
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Frequently asked questions
How do I add GST to a price?
Multiply the price by 1.15. So $100 becomes $115.
How do I work out the GST in a price?
Multiply the GST-inclusive price by 3 and divide by 23. So $100 including GST has $13.04 of GST in it. Don't just take 15% off, which would give $85, because GST is 15% of the price before GST, not of the total.
What is exempt from GST?
Some things have no GST, such as the rent on a home you live in and financial services like interest and mortgage loans.
When does a business have to register for GST?
Once its turnover reaches $60,000 in the last 12 months, or is expected to in the next 12 months.