NZ GST calculator
Add 15% GST to a price, or find the GST inside a price that already includes it. Rounded to the cent, with the working shown.
Calculated on your device, rounded to the nearest cent, half up.
How to add GST to a price
GST in New Zealand is 15% of the price before GST: multiply by 1.15.
Example: a job priced at $400 before GST. GST is $400 × 15% = $60, so the price including GST is $460.
How to work out the GST in a GST-inclusive price
A price including GST is 115% of the price before GST, so the GST is 3/23 of it: multiply by 3, then divide by 23.
Example: $460 including GST contains $460 × 3 ÷ 23 = $60 of GST, so the price before GST is $400.
Common mistake: taking 15% of a GST-inclusive price. 15% of $460 is $69, which overstates the GST by $9. Use 3/23 instead.
Quick reference
| Amount | GST if you add it | Total with GST | GST inside it | Amount without GST |
|---|---|---|---|---|
| $50.00 | $7.50 | $57.50 | $6.52 | $43.48 |
| $100.00 | $15.00 | $115.00 | $13.04 | $86.96 |
| $200.00 | $30.00 | $230.00 | $26.09 | $173.91 |
| $500.00 | $75.00 | $575.00 | $65.22 | $434.78 |
| $1,000.00 | $150.00 | $1,150.00 | $130.43 | $869.57 |
| $2,750.00 | $412.50 | $3,162.50 | $358.70 | $2,391.30 |
What your invoice needs to show
Inland Revenue's rules depend on the value of the sale (the "taxable supply information"):
- $200 or less: your name or trading name, the date, a description of the goods or services and the amount paid.
- Over $200 up to $1,000: also your GST number and the GST: the GST-exclusive amount, the GST and the GST-inclusive amount, or the GST-inclusive amount with a statement that it includes GST at the standard rate.
- Over $1,000: also the buyer's name and at least one identifier, such as their address, phone number, email, NZBN or website.
For sales over $200, you must provide this information to a GST-registered buyer within 28 days if they ask for it.
Who charges GST
Only GST-registered businesses charge GST. You must register once your taxable sales reach $60,000 in 12 months (or you expect them to), and you can register voluntarily below that.
Questions
How do I add GST to a price in New Zealand?
Multiply the price before GST by 1.15. $200 plus GST is $200 + $30 = $230.
How do I work out the GST in a GST-inclusive price?
Multiply by 3 and divide by 23 (the GST fraction at 15%). $230 including GST contains $30 of GST, so the price before GST is $200. Taking 15% of the total overstates the GST.
What is the GST rate in New Zealand?
Inland Revenue gives the GST rate as 15%. Some supplies are zero-rated or exempt.
Do I have to register for GST?
Inland Revenue says you must register when your taxable sales are at least $60,000 in a 12-month period (or are expected to be). You can register voluntarily below that.
Do I still need a tax invoice?
Inland Revenue now calls the required details "taxable supply information". For sales over $200 you show your GST number and the GST; over $1,000 you also show the buyer's name and an identifier. Many businesses still title the document a tax invoice.
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OpenSources
- Inland Revenue: GST (goods and services tax)
- Inland Revenue: Registering for GST
- Inland Revenue: How taxable supply information works
Last reviewed 28 October 2026. General information, not tax or legal advice. If you're unsure how a rule applies to your business, ask Inland Revenue or a qualified adviser.
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