GST returns in NZ: a small business owner's guide

GST, Goods and Services Tax, is a flat 15% added to most goods and services in New Zealand. As a registered business, you collect it on your sales, you pay it on your purchases, and each period you settle the difference with Inland Revenue. That's the whole concept. The detail is in the edges.

Do you need to register?

You must register for GST if your turnover is over NZ$60,000 in the past 12 months, or you reasonably expect it to cross that line in the next 12. Below the threshold, registration is optional, and sometimes worth doing voluntarily, for example if you spend a lot on GST-inclusive costs and want to claim it back, or if looking GST-registered matters to the clients you deal with.

How often do you file?

You choose a filing frequency (within the rules for your turnover):

• Monthly, more admin, but smoother cash flow and faster refunds. Common for bigger or refund-heavy businesses.
• Two-monthly, the most popular choice for small businesses. A good balance of effort and cash-flow rhythm.
• Six-monthly, least admin, available to smaller businesses, but you're sitting on the GST longer and the bills are bigger when they land.

Whichever you pick, the golden rule is the same: set the GST aside as you go. The most painful GST mistakes aren't filing errors, they're spending money that was never really yours.

What you can claim

You can generally claim the GST portion of business expenses, stock, tools, software, professional services, and so on. A few things to keep straight:

• Keep valid tax invoices for what you claim. No record, no claim.
• Mixed-use items (something used for both business and personal) are apportioned, you only claim the business share.
• Some things are exempt or zero-rated (certain financial services, residential rent, some exports). They're treated differently, and getting this wrong is a common source of errors.

The deadline, and why people miss it

GST returns and payments are due by the 28th of the month after your period ends, with two well-known exceptions: the period ending 31 March is due 7 May, and the period ending 30 November is due 15 January. Miss a deadline and you're looking at penalties and interest, entirely avoidable, and entirely irritating.

People miss deadlines for a boring reason: their books aren't ready in time, so the return becomes a last-minute scramble that's easy to put off. The fix isn't willpower. It's keeping your bookkeeping reconciled all period so the return is essentially already done when the date arrives.

How to make GST a non-event

1. Register at the right time, don't accidentally trip the threshold and owe back-dated GST.
2. Reconcile continuously so your GST figures are accurate, not guessed at deadline.
3. Quarantine the GST as it comes in, ideally in a separate account, so paying it never dents cash flow.
4. File from clean data and lodge a few days early, not a few hours late.

Do those four things and GST stops being a recurring stress and becomes a quiet line in your monthly rhythm.

This guide is general information, not tax advice. GST rules and thresholds can change, check current Inland Revenue guidance or talk to us about your specific situation.