GST Calculator NZ: Add or Subtract GST
Use our GST Calculator below to add GST to a price, or extract the GST portion from a tax-inclusive total. Tap any Copy button to copy a figure straight to your clipboard for use in invoices, quotes, or your GST return. The calculator uses New Zealand's standard 15% GST rate.
Updated 3 May 2026
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Know This: Send Invoices and File GST Returns Without Using a GST Calculator
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GST details
Action
Total including GST
$0.00
Amount excluding GST
$0.00
GST at 15%
$0.00
Amount including GST
$0.00
The highlighted row is the value you entered. Tap any Copy button to copy that figure to your clipboard.
Our GST calculator handles every common scenario you'll come across in New Zealand:
Know This: Whether you're issuing an invoice, checking a supplier's quote, or reconciling a transaction for your GST return, the calculator above handles it instantly.
Assumptions:
Related resources: GST Due Dates, PAYE Calculator and Chasing Slow Debtors
- Working out the GST on a price that excludes it
- Extracting the GST portion from a tax-inclusive total
- Finding the amount before GST when you only know the final figure
- Calculating GST for your two-monthly or six-monthly GST return, and
- Pricing margins on goods you've bought GST-inclusive.
Know This: Whether you're issuing an invoice, checking a supplier's quote, or reconciling a transaction for your GST return, the calculator above handles it instantly.
Assumptions:
- Our GST calculator uses New Zealand's standard GST rate of 15%, in place since 1 October 2010
- Results are rounded to two decimal places. Inland Revenue accepts rounding either up or down on individual transactions provided you're consistent
- The calculator does not account for zero-rated supplies (such as exports and the sale of a going concern) or exempt supplies (such as residential rent and most financial services). For these, GST is calculated differently (or not at all).
- For complex GST scenarios (mixed supplies, second-hand goods, imported services subject to reverse charge), refer to Inland Revenue's GST guide or speak to your accountant
- This calculator is for working out the GST split on a known amount. To file your GST return, use Xero or another accounting system that handles the full calculation
Related resources: GST Due Dates, PAYE Calculator and Chasing Slow Debtors
GST Due Dates
Our guide to GST Due Dates explains more. For businesses with a March 31 balance day, the following applies:
March 31 Balance Date – Two Monthly GST
March 31 Balance Date – Six Monthly GST
March 31 Balance Date – Two Monthly GST
- June 28: April/May GST Return & Payment Due
- 28 August: June/July GST Return & Payment Due & 1st Provisional Tax Instalment Due
- October 28: August/September GST Return & Payment Due
- 15 January: October/November GST Return & Payment Due & 2nd Provisional Tax Instalment Due
- February 28: December/January GST Return & Payment Due
- April 7: Terminal Tax Due
- 7 May: February/March GST Return & Payment Due & 3rd Provisional Tax Instalment Due
March 31 Balance Date – Six Monthly GST
- 28 October: April/September GST Return & Payment Due & 1st Provisional Tax Instalment Due
- 7 May: October/March GST Return & Payment Due & 2nd Provisional Tax Instalment Due
Frequently Asked Questions
When do I need to register for GST?
The trigger is turnover, not profit. Once your business takes in more than $60,000 in any rolling 12-month period, registration is compulsory and you have 21 days from when you cross the threshold to register with Inland Revenue.
You can also register voluntarily below the $60,000 mark, which makes sense if you sell mainly to other GST-registered businesses (your customers claim the GST back anyway) or if you have significant business expenses where you'd like to claim the GST credit.
It rarely makes sense to register voluntarily if your customers are mainly the public, because adding 15% to your prices without raising what you charge effectively cuts your margin.
You can also register voluntarily below the $60,000 mark, which makes sense if you sell mainly to other GST-registered businesses (your customers claim the GST back anyway) or if you have significant business expenses where you'd like to claim the GST credit.
It rarely makes sense to register voluntarily if your customers are mainly the public, because adding 15% to your prices without raising what you charge effectively cuts your margin.
How often do I file a GST return?
Three options exist - monthly, two-monthly, or six-monthly. Inland Revenue defaults you to two-monthly, which works for most small businesses and self-employed contractors.
Six-monthly filing is only available if your turnover is under $500,000, and it's not generally the best approach because waiting six months between returns means a much larger lump sum to pay each time - it is easy to spend the money before the bill arrives.
Monthly filing is compulsory if your turnover exceeds $24 million, and optional below that for businesses that want tighter cashflow tracking or have GST refunds coming back regularly.
Six-monthly filing is only available if your turnover is under $500,000, and it's not generally the best approach because waiting six months between returns means a much larger lump sum to pay each time - it is easy to spend the money before the bill arrives.
Monthly filing is compulsory if your turnover exceeds $24 million, and optional below that for businesses that want tighter cashflow tracking or have GST refunds coming back regularly.
What are zero-rated and exempt supplies, and what's the difference?
Both mean no GST is charged on the sale, but the difference matters for what you can claim back. Zero-rated supplies (exports of goods, services performed overseas, the sale of a business as a going concern) are technically taxable at 0%, which means you still claim GST on related costs.
Exempt supplies (residential rent, most financial services, donated goods sold by non-profits) sit outside the GST system entirely, and you can't claim GST on costs related to making them. If you supply both kinds, your accountant will need to apportion your input GST claims, which is one of the trickier areas of NZ GST.
Exempt supplies (residential rent, most financial services, donated goods sold by non-profits) sit outside the GST system entirely, and you can't claim GST on costs related to making them. If you supply both kinds, your accountant will need to apportion your input GST claims, which is one of the trickier areas of NZ GST.
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Reminder: Send Invoices and File GST Returns Without Using a GST Calculator
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