NZ GST 3/23rds calculator
Extract 15% GST from gross receipts using the IRD 3/23rds rule or add GST to New Zealand wholesale quotes. Free online calculator.
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About this tool
Calculate 15% GST in New Zealand or extract the GST content from GST-inclusive prices using the official IRD 3/23rds fraction.
How to use it
- 1 Enter the dollar amount you want to calculate.
- 2 Choose "Add GST (+15%)" to find total price or "Remove GST (-15%)" to extract GST from a gross amount.
- 3 View the base amount, GST portion, and final total instantly.
Questions
Why is the NZ GST formula 3 divided by 23?
Because GST is 15%, a GST-inclusive price represents 115% of the base price. The GST portion is 15/115, which simplifies directly to 3/23.
What is the current GST rate in New Zealand?
The standard GST rate in New Zealand is 15% on most goods and services.
How do I remove GST from a price in New Zealand?
To find the GST component of a GST-inclusive price, multiply the total by 3 and divide by 23 (or multiply by 3/23 = ~13.0435%).
Is my data uploaded?
No. This tool runs in your browser, so your text and files never reach our server.
Is this tool free?
Yes. It’s free to use with no sign-up and no limits for normal use.
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