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How do I calculate GST from a GST-inclusive amount?

To find the GST component of a GST-inclusive price, divide the total by 1.15, then subtract that from the original amount. Alternatively, multiply the inclusive amount by 3 and divide by 23. For example, $115 inclusive contains $15 GST.

How do I add GST to a GST-exclusive amount?

Multiply the exclusive amount by 0.15 to get the GST, or by 1.15 to get the total inclusive amount. For example, $100 + 15% GST = $115 total.

When do I need to register for GST in New Zealand?

You must register for GST if your turnover exceeds $60,000 in any 12-month period. You can also register voluntarily if your turnover is below this threshold. Registration is done through Inland Revenue (IRD).

How often do I file GST returns?

GST returns are typically filed monthly, two-monthly, or six-monthly, depending on your turnover and preference. Most small businesses file two-monthly or six-monthly.

Are there any goods or services exempt from GST?

Most goods and services are subject to GST. However, some financial services, exported goods, and certain land transactions may be zero-rated (0%) or exempt. If you're unsure, consult your accountant or the IRD.

Business Tools/NZ GST Calculator

Free NZ GST Calculator · 15%

NZ GST Calculator

Add or remove 15% GST from any amount in seconds. Accurate, instant, and free — built for New Zealand business owners and sole traders.

NZ GST Calculator

Standard rate · 15%

Calculation mode

Amount (excl. GST)

Net amount

$0.00

GST (15%)

$0.00

Total (incl. GST)

$0.00

Rates valid for 2025/26 tax year · Last reviewed August 2025

IRD — GST

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How New Zealand GST works

Goods and Services Tax (GST) in New Zealand is a flat 15% tax applied to most goods and services. It has been set at 15% since 1 October 2010. If your business turnover exceeds $60,000 in any 12-month period, you are required to register for GST with Inland Revenue.

Adding GST (exclusive → inclusive): multiply the net amount by 1.15. For example, $1,000 + 15% GST = $1,150.

Removing GST (inclusive → exclusive): divide the total by 1.15 to find the net, then subtract the net from the total to find the GST. For example, $1,150 inclusive = $1,000 net + $150 GST.

This calculator handles both directions instantly — just toggle between 'Add GST' and 'Remove GST' to switch. All calculations are performed locally in your browser, so your figures never leave your device.

NZ GST Calculator frequently asked questions

The standard GST rate in New Zealand is 15%. It has been 15% since 1 October 2010, when it was raised from 12.5%. Most goods and services sold in New Zealand are subject to this rate.