Finance calculator
New Zealand - 2026New Zealand GST Calculator
Add or remove New Zealand GST at 15%, zero, or custom rates. Split GST-inclusive or GST-exclusive prices into net, GST, total, and the 3/23 GST portion.
New Zealand GST
Add GST, remove GST, and keep the 3/23 shortcut visible
New Zealand GST is commonly checked in two directions: add 15% GST to a price before GST, or remove GST from a GST-inclusive total. At 15%, the GST portion inside an inclusive price is 3/23 of the total.
That shortcut is useful for invoices and quick checks, but the calculator still keeps the net, GST amount, and gross total separated so the direction of the calculation is clear.
For example, NZ$1,000 before GST becomes NZ$1,150 after adding 15% GST. A GST-inclusive NZ$1,150 total contains NZ$150 GST and NZ$1,000 before GST.
Before using the result
- Confirm whether the entered amount is before GST or GST-inclusive.
- Use 15% unless you have verified a zero-rated or custom-rate case.
- For inclusive prices at 15%, GST is total x 3 / 23 and the before-GST amount is total x 20 / 23.
- Check Inland Revenue guidance for filing, invoices, and special supplies.
FormulaGST = net price x rate; gross price = net price + GST; at 15%, GST included = gross price x 3 / 23
Formula
New Zealand GST add/remove formulas
This calculator applies the GST rate you select and does not determine zero-rated, exempt, imported, registration, or filing treatment.
GST = net price x rate; gross price = net price + GST; at 15%, GST included = gross price x 3 / 23
At 15% GST, 1,000 before GST has 150 GST and a gross price of 1,150. A GST-inclusive 1,150 price contains 150 GST.
SourcesThis profile covers a simplified New Zealand GST add/remove calculation using the selected GST rate. The default standard-rate scenario uses 15% GST for taxable supplies, including Inland Revenue's 3/23 method for finding GST inside a 15% GST-inclusive price.
Sources and assumptions
New Zealand GST source notes
This profile covers a simplified New Zealand GST add/remove calculation using the selected GST rate. The default standard-rate scenario uses 15% GST for taxable supplies, including Inland Revenue's 3/23 method for finding GST inside a 15% GST-inclusive price.
- Effective year
- 2026
- Last verified
- 2026-07-13
This calculator applies the GST rate you select and does not determine zero-rated, exempt, imported, registration, or filing treatment.
Official and reference sources
Assumptions
- The default New Zealand GST rate is 15%, with zero and custom-rate options for user-verified cases.
- For GST-exclusive prices, GST is calculated as net price x 15%.
- For GST-inclusive prices at 15%, the GST portion is gross price x 3 / 23.
- The calculator applies one selected GST rate to the whole amount.
Not included
- GST registration, filing, return periods, tax invoices, input tax claims, and accounting-basis choices.
- Zero-rated, exempt, imported, exported, mixed-use, platform, and special-supply GST rules.
- Professional tax advice or official Inland Revenue determinations.
FAQ8 common questions for this calculator.
FAQs
How much is GST in NZ?+
New Zealand's standard GST rate is 15% for most taxable goods and services. The calculator defaults to 15% and also supports zero or custom rates.
How do I remove GST from a GST-inclusive price in New Zealand?+
At the 15% rate, multiply the GST-inclusive price by 3/23 to find the GST portion, then subtract that GST amount to get the price before GST.
How do I add 15% GST to NZ$1,000?+
Multiply NZ$1,000 by 15% to get NZ$150 GST, then add it to the net amount for a GST-inclusive total of NZ$1,150.
How do I remove GST from NZ$1,150?+
At 15%, GST inside NZ$1,150 is NZ$1,150 x 3/23 = NZ$150, leaving NZ$1,000 before GST.
Can the NZ GST calculator remove GST from an inclusive price?+
Yes. Choose GST-inclusive mode to split the total into GST-exclusive price and GST amount.
Can it add 15% GST to a price before GST?+
Yes. Choose before-GST mode, enter the net price, and the calculator adds 15% GST unless you select a zero or custom rate.
How does the New Zealand GST Calculator calculate the result?+
For the New Zealand GST Calculator, it uses the New Zealand GST add/remove formulas: GST = net price x rate; gross price = net price + GST; at 15%, GST included = gross price x 3 / 23. At 15% GST, 1,000 before GST has 150 GST and a gross price of 1,150. A GST-inclusive 1,150 price contains 150 GST.
What information do I need to use the New Zealand GST Calculator?+
Enter the money values, rates, dates, quantities, or assumptions requested by the form. Keep every amount in the same currency or business period before comparing the New Zealand GST Calculator result.
RelatedNearby finance calculators for the next step after New Zealand GST Calculator.
Finance calculators to compare next
Finance guide
How to use the New Zealand GST Calculator
Add or remove New Zealand GST at 15%, zero, or custom rates. Split GST-inclusive or GST-exclusive prices into net, GST, total, and the 3/23 GST portion. The page also explains the new Zealand GST add/remove formulas and shows a practical example: At 15% GST, 1,000 before GST has 150 GST and a gross price of 1,150. A GST-inclusive 1,150 price contains 150 GST.
- 1
Enter your details
Enter the values for the new zealand gst calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the new Zealand GST add/remove formulas: GST = net price x rate; gross price = net price + GST; at 15%, GST included = gross price x 3 / 23.
- 3
Compare scenarios
Change one or more inputs to see how they affect the new Zealand GST Calculator result before you use the estimate.