GST in New Zealand: A Plain-English Guide for Small Business Owners

If you’ve recently started a business in New Zealand or you’re thinking about it, GST is probably one of those things that sounds more complicated than it needs to be. The good news? Once you understand the basics, it’s quite manageable. Let’s break it down in plain English.

What Is GST?

GST stands for Goods and Services Tax. It’s a tax of 15% added to the price of most goods and services sold in New Zealand. As a business owner, you collect GST on behalf of the government when you sell something, and you can claim back the GST you’ve paid on your own business expenses.

Think of yourself as a middle person between your customers and Inland Revenue (IRD). You collect it, hold it, and pass it on.

Do You Have to Register for GST?

Not every business needs to register for GST. But you must register if your business turnover exceeds (or is expected to exceed) $60,000 in any 12-month period. This is known as the GST registration threshold.

If your turnover is below $60,000, registration is optional. But there are good reasons you might choose to register voluntarily:

  • You can claim GST back on your business purchases and expenses
  • It can make your business look more established to clients and suppliers
  • If you’re buying a lot of equipment or stock upfront, claiming that GST back can improve your cash flow significantly

If you’re unsure whether to register, it’s worth having a conversation with your accountant before deciding.

How Often Do You File GST Returns?

Once registered, you’ll file GST returns with IRD on a regular basis. There are three filing frequency options:

Filing FrequencyWho It Suits
MonthlyBusinesses with turnover over $24 million, or those who prefer regular cash flow management
Two-monthlyThe most common option for small to medium businesses
Six-monthlyBusinesses with turnover under $500,000 and straightforward GST activity

What Can You Claim GST Back On?

You can claim the GST portion back on most genuine business expenses, including:

  • Office supplies and equipment
  • Business-related travel and vehicle costs (with some conditions)
  • Professional services like accounting, legal, and consulting fees
  • Software subscriptions used for your business
  • Marketing and advertising costs
  • Rent for business premises

 The key rule is that the expense must be for business purposes. Mixed-use expenses need to be apportioned accordingly.

A Simple Example

Let’s say you run a small design studio:

You invoice a client $1,150 (including $150 GST) You buy software subscriptions costing $230 (including $30 GST) GST collected from your client: $150 GST you can claim back on the software: $30 You pay IRD the difference: $120

Common GST Mistakes to Avoid

1. Missing your filing deadlines

IRD charges interest and late filing penalties. Mark your filing dates in your calendar or set up reminders. Using Xero or another cloud accounting platform can help automate this.

2. Forgetting to set aside GST funds

The GST you collect from customers isn’t your money, it belongs to IRD. A good habit is to transfer 15% of every payment into a separate account so you’re never caught short at filing time.

3. Claiming GST on non-GST expenses

Not all expenses include GST. Bank fees, wages, and most financial services are GST-exempt. Claiming GST on these is an error that IRD can pick up during a review.

4. Not keeping receipts

IRD requires you to hold records for at least seven years. If you’re claiming GST on an expense, you need a valid tax invoice to back it up.

Using Xero to Make GST Easier

If you’re using Xero (which we strongly recommend for NZ small businesses), managing GST becomes much more straightforward. Xero automatically:

  • Tracks GST on every transaction
  • Calculates your GST return each period
  • Allows you to file directly to IRD with one click
  • Keeps your records organised and audit-ready

 As Xero Adviser Certified professionals, we help clients set up Xero correctly from the start, so GST is never a source of stress.

Need Help With GST or IRD Compliance? Whether you’re just starting out, unsure about registration, or want someone to handle your GST returns so you can focus on running your business — we’re here to help. At Finit NZ, we work with small and medium businesses across New Zealand to make accounting and tax compliance straightforward and stress-free.

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