Free calculator
GST calculator
Enter a price and choose whether to add GST or take it out. You get the price excluding GST, the GST and the total your tax invoice will show.
GST
$150.00
- Price excluding GST
- $1,000.00
- GST at 15%
- $150.00
- Total including GST
- $1,150.00
How GST is worked out
GST is 15% of the price excluding GST. On $1,000 the GST is $150 and the total $1,150.
To take GST out of a price that includes it, multiply by 3/23 (the same as 15/115): $1,150 includes $150 of GST. That works only when the whole price is standard-rated.
Round GST to the nearest cent. On a tax invoice you can show the GST on its own line, or the GST-inclusive total with a statement that it includes GST, when every item is taxed at 15%.
When you charge GST
- Only once you’re registered for GST — compulsory when your taxable supplies pass NZ$60,000 in 12 months, or you expect them to.
- At 0% on zero-rated supplies such as exported goods and many services to non-residents.
- Not at all on exempt supplies such as residential rent and financial services.
Last updated . This calculator is a guide, not tax advice.
Frequently asked questions
How do I calculate GST from a total in New Zealand?
Multiply the GST-inclusive total by 3 and divide by 23. $230 includes $30 of GST, so the price excluding GST is $200.
Do I charge GST if I’m not registered?
No. Until Inland Revenue registers you, your invoices show no GST and shouldn’t be titled “Tax Invoice”.
Is GST still 15%?
Yes. New Zealand has one GST rate, 15%, with no regional taxes on top.