Basics
What is GST in New Zealand?
Who charges GST, who has to register, and what the 15% rate applies to.
New Zealand GST calculator
GST, calculated clearly.
Your amount
Calculate 15% GST
Calculation
Your GST result
- GST exclusive
- $0.00
- GST amount
- $0.00
- GST inclusive
- $0.00
This session
Calculation history
| Exclusive | GST | Inclusive | Actions |
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GST in New Zealand is charged at 15%. This calculator adds 15% to a GST-exclusive amount and takes 3/23 of a GST-inclusive amount, which is the method published by Inland Revenue.
Add GST, remove GST, or work backwards from the GST amount using a private calculator built for New Zealand dollars.
Why use this calculator
Calculated in your browser
Amounts stay on your device. Nothing you type is sent to a server, and the page keeps no record once you close it.
No signup, no limits
Free to use as often as you need. There is no account to create, no paywall and no usage cap.
Ready for your spreadsheet
Keep a running list of calculations and download the lot as a CSV whenever you need to hand them on.
How the calculation works
Three questions cover almost every GST calculation. The calculator answers all three at once, but the arithmetic behind each one is short enough to check by hand.
Adding GST
You have a price that excludes GST and need the total to charge.
GST = amount × 0.15
$100.00 becomes $15.00 of GST and $115.00 to pay.
Removing GST
You have a GST-inclusive price and need the GST inside it.
GST = amount × 3 ÷ 23
$115.00 contains $15.00 of GST, leaving $100.00 excluding GST.
Starting from the GST
You know the GST alone and need both prices behind it.
Excluding GST = GST × 20 ÷ 3
$15.00 of GST means $100.00 excluding and $115.00 including.
Each result is rounded once to the nearest cent, and a fraction of exactly half a cent is discarded, following Inland Revenue's treatment of fractions of a cent.
Popular GST guides
Longer explanations for the times a calculator is not the whole answer.
Method
How to calculate GST by hand
The arithmetic behind adding GST, removing GST and working back from a GST amount.
Spreadsheets
How to calculate GST in Excel
Build GST-inclusive, exclusive and component columns that hold up across a whole price list.
Spreadsheets
How to calculate GST in Google Sheets
The same formulas for Sheets, including how to apply them down a column.
Free download
Do it in a spreadsheet instead
A small Excel workbook with the three calculations already set up: add GST to a price, take GST out of a price, and rebuild both prices from a GST amount. The formulas are visible, so you can copy them into a sheet of your own.
Common GST questions
General information about how GST works in New Zealand, not tax advice. Check anything that affects a return with Inland Revenue or your accountant.
What is the GST rate in New Zealand?
GST is charged at 15% on most goods and services. A few supplies are zero-rated, such as exported goods and services, and some, including most financial services, are exempt.
How do I find the GST inside a price that already includes it?
Multiply the GST-inclusive price by 3 and divide by 23. On a $115.00 price that is $15.00 of GST, leaving $100.00 excluding GST.
Is dividing by 1.15 the same thing?
It reaches the same answer. The 3/23 fraction is the one Inland Revenue publishes, and it avoids rounding a repeating decimal partway through the calculation.
When do I need to register for GST?
You must register when your turnover was at least $60,000 in the last 12 months, or you expect it will be at least $60,000 in the next 12 months.
Does this calculator send my numbers anywhere?
No. Every calculation runs in your browser. Nothing is uploaded, and the history disappears when you close or reload the page.
Can I use it for refunds or credit notes?
Yes. Negative amounts are accepted, so you can work out the GST on a reduction. How that adjustment should be reported is still your decision.