NZ GST Calculator — Add or Remove 15%
Add GST to an exclusive price, or take GST off a total, at New Zealand’s IRD standard rate of 15%. Handy for invoices, quotes, price tags and Xero/Shopify checks. Everything updates as you type.
Formulas: exclusive = inclusive ÷ 1.15 · GST = exclusive × 0.15 · inclusive = exclusive × 1.15
From inclusive → exclusive
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From exclusive → inclusive
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Estimate only — general information, not tax advice. Confirm with Inland Revenue or your accountant for your situation. Rate fixed at 15% GST (IRD standard).
Pair this GST check with landlord compliance tracking.
Prices exclude GST. Illustrative tools only — not legal, tax or financial advice.
How NZ GST maths works
New Zealand’s standard GST rate is 15% (Inland Revenue). To take GST off a total that already includes GST, divide by 1.15. To find the GST component from an exclusive amount, multiply by 0.15. To add GST, multiply the exclusive amount by 1.15.
Example: $115 incl GST → $115 ÷ 1.15 = $100 ex GST, and GST = $15. Or $100 ex GST → GST = $100 × 0.15 = $15, total $115.
Frequently asked questions
How do I calculate GST from a total in NZ?
If the price already includes GST, divide the total by 1.15 to get the exclusive (ex GST) amount. Then GST = total − exclusive. Example: $230 ÷ 1.15 = $200 ex GST; GST = $30.
How do I take GST off a price?
Use the “GST-inclusive” mode above, or manually divide by 1.15. Do not multiply by 0.15 on an inclusive total — that overstates GST. Always divide inclusive amounts by 1.15 first.
Is GST 15% in New Zealand?
Yes. The IRD standard goods and services tax rate is 15%. Some supplies are zero-rated or exempt; this calculator is for the standard 15% rate only. Confirm special cases with IRD or your accountant.
How do I add 15% GST?
Multiply the exclusive amount by 0.15 for the GST dollars, or by 1.15 for the inclusive total. Example: $80 × 1.15 = $92 incl GST.