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GST calculator NZ

To add GST in New Zealand, multiply the price by 1.15. To find the GST inside a GST-inclusive price, multiply it by 3 and divide by 23; the price without GST is the total divided by 1.15.

Advanced adds the details: more fields, your own assumptions and a fuller breakdown.

Amount (NZ$)

The amount is

GST rate

GST 15%Other rate

Including GST

$115.00

GST (15%): $15.00

Excluding GST: $100.00
GST (15%): $15.00
Including GST: $115.00

GST at 15% is 3/23 of the GST-inclusive price.

Invoice this amount

The numbers stay in this browser.

How to add GST

Multiply the price by 15% and add it: NZ$200 plus NZ$30 GST is NZ$230. In one step: NZ$200 × 1.15 = NZ$230.

How to work out GST from a GST-inclusive price

Multiply the total by 3/23: NZ$230 × 3 ÷ 23 = NZ$30. Divide the total by 1.15 for the price excluding GST: NZ$200.

Zero-rated and exempt supplies

Zero-rated supplies (for example most exports) carry GST at 0% and still go on your GST return. Exempt supplies (for example some financial services and residential rent) carry no GST at all. Inland Revenue lists both.

You must register for GST when your turnover was more than NZ$60,000 in the last 12 months, or is expected to be in the next 12 months.

Rate and threshold from Inland Revenue (IRD). Rate checked on 6 October 2026. Inland Revenue (IRD), New Zealand · Inland Revenue (IRD), New Zealand

QuickBilling adds GST per line on your invoices and keeps a GST summary for each period. See the tax summary.

Questions

How do I calculate GST in NZ?

Multiply the price excluding GST by 0.15 for the GST, or by 1.15 for the GST-inclusive price. NZ$1,000 plus GST is NZ$1,150.

How do I take GST off a price?

Divide the GST-inclusive price by 1.15. The GST is 3/23 of the inclusive price: NZ$1,150 includes NZ$150 GST.

When do I have to register for GST?

When your turnover was more than NZ$60,000 in the last 12 months or is expected to be in the next 12. You can register voluntarily below that.

What does 3/23 mean?

It is the GST share of a GST-inclusive price at 15%: 15 ÷ 115 = 3/23.

Does the calculator save my numbers?

No. It runs in your browser and sends nothing to QuickBilling or anyone else.

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