How to File GST Return in NZ: Step-by-Step Guide (2025)

Filing your first GST return in New Zealand can feel like a small maze of forms and deadlines. But once you know the key steps and dates, it becomes a straightforward monthly or two-monthly task. In this guide you’ll find a step-by-step walkthrough for using myIR, the official online portal, along with the most common pitfalls to avoid.

Standard GST rate: 15% · Registration threshold (annual turnover): NZD 60,000 · Filing deadline: 28th of month after taxable period ends · Filing frequency options: Monthly, two-monthly, or six-monthly · Online filing methods: myIR portal, accounting software, or paper form

The table below summarizes the core facts every filer needs to know.

How to file a GST return in NZ?

Step-by-step filing process

1. Log into myIR using your RealMe login. (If you don’t have one, Inland Revenue (NZ tax authority) provides registration instructions.)
2. From your dashboard, select “Returns and transactions” next to the relevant GST account. (Inland Revenue)
3. Locate the taxable period you need to file, then click “File return”. (Inland Revenue)
4. Choose whether to enter GST amounts or total sales and purchases — myIR supports both. (Inland Revenue)
5. Enter your total sales and income (including zero-rated supplies) and your total purchases and expenses (including GST). (Inland Revenue GST guide (official IRD document))
6. Review the automatically calculated net GST. If your return shows a refund, you can choose to transfer some of it to provisional tax (Box 25). If GST is payable, that amount goes into Box 27 and can be combined with provisional tax in Box 28. (Inland Revenue GST guide)
7. Check everything, then submit. You’ll receive a confirmation.

The implication: myIR puts the entire filing process in your hands, but only if you have your sales and purchase figures ready before you log in.

Using myIR

• myIR is free and available 24/7. (Inland Revenue)
• You can choose to file a nil return if you had no sales or purchases for the period. (Inland Revenue)
• The same completion steps apply whether you file in myIR or on paper (Inland Revenue GST guide).

Filing via accounting software

• Popular tools like Xero and MYOB integrate directly with IRD for automatic filing. (Xero (accounting software provider))
• Software calculates totals for you, reducing manual entry errors.
• You still need to verify the figures before submission.

What is GST Return?

Definition of GST return

A GST return in New Zealand is a periodic statement that calculates how much goods and services tax you owe (or will be refunded) to Inland Revenue. Business.govt.nz (government business advice service) explains it clearly: it’s the sum of GST you charged your customers minus the GST you paid on your business purchases.

Components: output tax and input tax

• Output tax – the GST you collect from customers on sales.
• Input tax – the GST you pay on business expenses and purchases.
• Net GST = output tax – input tax. If positive, you pay IRD; if negative, you get a refund.

Taxable period and rates

• The standard GST rate is 15%. Some supplies (e.g., exported goods) are zero-rated. (Inland Revenue (GST overview))
• Taxable periods are monthly, two-monthly, or six-monthly. Most small businesses choose two-monthly or six-monthly. (Business.govt.nz)

The pattern: output and input tax are mirror images, and keeping them straight prevents either overpaying the government or underpaying it — both costly outcomes.

Can I file my GST return online?

Online filing options

Yes, you have two primary online methods:

• myIR – the official Inland Revenue portal, free and accessible with a RealMe login.
• Accounting software – tools like Xero, MYOB, or Hnry can submit directly to IRD.

Inland Revenue (NZ tax authority) states that online filing is the most common method and allows for faster processing.

Using myIR

• Requires a RealMe login (free to create).
• You can upload a file from your accounting system or enter figures manually.
• Confirmation is immediate.

Using third-party accounting software

• Most software packages now have a “Submit GST return to IRD” button that files directly via an API.
• Best suited for businesses that already use digital accounting.

The pattern: if you’re comfortable with spreadsheets, myIR is perfectly adequate. If you want full automation, accounting software saves you from re-entering numbers.

Can I file my GST return myself?

DIY filing requirements

Absolutely. As long as you have accurate records of all sales invoices and expense receipts, you can file without an accountant. Business.govt.nz (government business advice) provides a detailed checklist for self-filers.

When to use a tax agent

If your business has complex transactions — multi-currency sales, partial zero-rating, or multiple GST-registered entities — a tax agent or chartered accountant can prevent costly errors. But for a straightforward sole trader operation, DIY is entirely doable.

Tools to simplify self-filing

• Use accounting software to automatically categorise sales and purchases.
• Set up a separate bank account for GST to avoid mixing funds.
• Download the IR375 GST guide (Inland Revenue official guide) for box-by-box instructions.

The trade-off: doing it yourself saves money on accountant fees but costs time and attention to detail. If your time is worth more than a few hundred dollars a year, paying a professional may be the smarter move.

Do you have to pay GST if you earn under $60,000?

GST registration threshold

No, you are not legally required to register for GST if your annual turnover is below NZD 60,000. Business.govt.nz (government business advice) states clearly that the $60,000 threshold applies to GST-exclusive turnover over the past 12 months.

Voluntary registration

You may still choose to register voluntarily. The advantage: you can claim input tax credits on business purchases. The downside: you must charge GST to your customers and file regular returns.

Consequences of not registering

• You cannot charge GST to customers.
• You cannot claim GST back on purchases.
• If your turnover exceeds $60,000 and you haven’t registered, IRD can impose penalties.

The implication: staying under the threshold keeps compliance simple. But if you have significant business expenses, voluntary registration could put more cash in your pocket via refunds.

GST filing quotes from official sources

“You can file your GST return by selecting ‘Returns and transactions’ next to your GST account, then choosing ‘File return’ next to the relevant period.”

“Once you’re registered for GST you need to file regular GST returns. You can file them online using myGST, a section of Inland Revenue’s myIR service.”

Bottom line: Filing a GST return in New Zealand is a manageable monthly or two-monthly task for any small business owner who keeps clean records. For sole traders earning under $60,000, the decision to register is a cash-flow trade-off. For everyone above that threshold, the path is clear: register, file through myIR or accounting software by the 28th, and avoid penalties. Set a recurring reminder — your future self will thank you.

Before you file your return, make sure you’ve completed the initial setup by registering for GST in myIR through the official portal.

Frequently asked questions