Finance calculator
New Zealand - 2026New Zealand GST Calculator
Add or remove New Zealand GST using standard, zero, or custom rates with clear net, GST, and gross price results.
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; net price = gross price / (1 + rate)
At 15% GST, 1,000 before GST has 150 GST and a gross price of 1,150.
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.
- Effective year
- 2026
- Last verified
- 2026-05-29
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 user selects the GST rate that applies to the supply.
- Exclusive mode treats the entered amount as before GST.
- Inclusive mode treats the entered amount as already including GST.
- The whole amount is treated as taxable at one selected rate.
Not included
- Zero-rated, exempt, imported, exported, mixed-use, and special-supply GST rules.
- Input tax deductions, registration, filing periods, tax invoices, penalties, and accounting-basis choices.
- Customs duties, levies, and non-GST charges.
FAQs
What New Zealand GST rate does this use by default?+
It defaults to the common 15% GST scenario and also offers zero and custom-rate options.
Can it remove GST from an inclusive price?+
Yes. Select GST-inclusive mode to split the total into price before GST and GST amount.
How does the New Zealand GST Calculator calculate the result?+
It uses the New Zealand GST add/remove formulas: GST = net price x rate; gross price = net price + GST; net price = gross price / (1 + rate). At 15% GST, 1,000 before GST has 150 GST and a gross price of 1,150.
What information do I need to use the New Zealand GST Calculator?+
Add or remove New Zealand GST using standard, zero, or custom rates with clear net, GST, and gross price results.
How accurate is the New Zealand GST Calculator?+
New Zealand GST Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the New Zealand GST Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Finance guide
How to use the New Zealand GST Calculator
Add or remove New Zealand GST using standard, zero, or custom rates with clear net, GST, and gross price results. 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.
- 1
Enter your details
Enter standard, zero, or custom rates with clear net, GST, and gross price results, then complete any other fields shown in the calculator.
- 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; net price = gross price / (1 + rate).
- 3
Compare scenarios
Change one or more inputs to see how they affect the new Zealand GST Calculator result before you use the estimate.
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