GST filing frequency: which cycle suits your cash flow?

Most owners pick a GST filing frequency once, at registration, and never think about it again. That’s a pity, because the cycle you’re on decides how big each GST bill is, how often it lands and how long you hold money that belongs to Inland Revenue. Choosing well is one of the cheapest cash flow decisions you’ll ever make.

What are the three GST filing frequencies?

Inland Revenue offers three cycles. The rules turn on your total sales in any 12-month period.

Frequency	Who can use it	Returns a year	Best suited to
Monthly	Anyone; compulsory above $24 million of sales	12	Regular refund claimants, larger businesses, owners who like a tight rhythm
Two-monthly	Sales under $24 million	6	Most small and medium businesses
Six-monthly	Sales under $500,000	2	Small, steady operators who keep GST aside without fail

Six-monthly is attractive on paper: two returns a year and very little admin. The catch is that six months of GST arrives as a single bill, and by then much of the cash may have been quietly spent on stock, wages or the van repair.

When is GST due in New Zealand?

The general rule is simple. Your return is due by the 28th of the month after the taxable period ends, and the payment is due the same day. There are two exceptions every owner should commit to memory:

• The period ending 31 March is due by 7 May.
• The period ending 30 November is due by 15 January.

The 15 January date is the one that catches people out. It arrives after the Christmas close-down, when takings are often thin and the team has just been paid holiday pay. If you’re two-monthly on the common cycle, 15 January is also a provisional tax date, so two bills can land together. Our piece on planning cash around the summer close-down walks through that squeeze.

How does frequency change your cash flow?

Think of GST as money you hold on trust. Between collecting it from customers and paying it to Inland Revenue, it sits in your account, and the length of that holding period is set by your filing frequency.

Illustrative example. A Tauranga landscaping business sells $40,000 a month excluding GST and buys $16,000 a month of GST-able materials and services. Net GST is roughly 15% of the $24,000 difference, so about $3,600 a month.

• Monthly: a bill of about $3,600, twelve times a year.
• Two-monthly: about $7,200, six times a year.
• Six-monthly (if it qualified): about $21,600, twice a year.

The total paid over the year is identical. What changes is the size of the hole each payment leaves, and how long the business can be tempted to treat that money as its own. Seasonal businesses feel this most: a six-monthly bill covering a busy summer can land in a quiet winter month.

Monthly, two-monthly or six-monthly: which should you choose?

A few practical tests help:

1. Do you usually get refunds? Exporters, start-ups buying equipment and businesses with big one-off purchases often claim more GST than they collect. Monthly filing brings those refunds forward.
2. How reliable is your set-aside habit? If GST money stays in the main account, shorter cycles keep the bills manageable. If you sweep GST into a separate account every week, a longer cycle is less risky.
3. Does your provisional tax option depend on it? The ratio option requires monthly or two-monthly GST, and six-monthly filers pay standard or estimation provisional tax in two instalments instead of three. See the four provisional tax options before you switch.
4. How seasonal is the year? A strong season followed by a lean one argues for shorter periods, so each bill reflects recent trading rather than last quarter’s boom.

Your accounting basis matters too. A business on the payments basis pays GST only when customers actually pay, which softens the impact of slow debtors. That choice is covered in GST payments, invoice or hybrid basis.

How do you keep the GST money ready?

Whatever the cycle, the method is the same: estimate the GST in each week’s takings, move it into a separate account, and leave it alone. Our GST & provisional tax set-aside planner turns your sales, costs and filing frequency into a weekly figure and shows the next due dates. For the reasoning behind the numbers, read how much GST to set aside.

If a GST bill does arrive before the cash, talk to Inland Revenue early; an agreed instalment arrangement generally costs less in penalties than silence. Some businesses prefer to fund the bill and repay it over a planned term instead, and that’s a conversation we can have. You can see if your business qualifies in about a minute, with no credit check.

Can you change frequency later?

Yes. You can ask Inland Revenue to change your filing frequency through myIR, as long as your sales fit the limits. Treat it as a planned change at the start of a period, not a mid-year scramble. Many owners move from six-monthly to two-monthly as they grow, simply because the lump sums become uncomfortable.

Where funding fits

Picking the right GST cycle smooths the bills; it doesn’t create the cash. If a growth push, a big contract or a run of slow payers means GST and provisional tax are competing with wages for the same dollars, a facility arranged ahead of time can keep everything on schedule. Our lending team looks at unsecured options for trading businesses and loans secured on property, and there’s no credit check just to ask. Your details stay with one team, a real person reads what you send, and accurate answers on the form mean the first call is genuinely useful. Start your enquiry here.