GST Filing Frequency Calculator

Worked example: Aria's homeware store

Aria runs a small homeware retail store with GST-exclusive turnover of about $350,000 a year. She buys stock, pays rent and wages, and consistently owes more GST on her sales than she claims back on her costs, so she is a net payer in most periods. Because her turnover is under $500,000, she is eligible for six-monthly, two-monthly, or monthly filing. Since she typically pays rather than receives, six-monthly filing suits her best: only two GST returns a year, and she holds the GST she has collected from customers for longer before it falls due to Inland Revenue. She sets aside the GST she collects in a separate account as she goes, so the twice-yearly bill is never a surprise.

Worked example: Marlon's building company

Marlon runs a small building company with GST-exclusive turnover of $650,000 a year. Because his turnover is over $500,000, six-monthly filing is no longer available to him, only two-monthly or monthly. This year he bought a new work vehicle and a set of specialist tools, both large GST-bearing purchases, so several of his recent GST returns have resulted in a refund rather than a bill. Since he regularly receives money back, monthly filing suits him better than the two-monthly default: instead of waiting up to two months for that refund, he gets it every month, which helps fund the next tool or vehicle purchase. A business with turnover of, say, $30 million a year would have no choice in the matter at all: once turnover passes $24 million, monthly filing is compulsory regardless of whether it usually pays or receives GST.

How GST filing frequency works in New Zealand

The Goods and Services Tax Act 1985 sets three filing frequencies, and which ones you can use depends on your taxable turnover over a rolling 12-month period, not a fixed financial year. Six-monthly filing is available if your turnover is $500,000 or less. Two-monthly filing, the frequency Inland Revenue applies by default when you register, is available to any registered business regardless of turnover. Monthly filing is available to any business that wants it, but becomes compulsory once turnover exceeds $24 million in a 12-month period. Because eligibility is turnover-based only, a small business is free to choose monthly filing even at $80,000 turnover if it wants more regular visibility of its numbers, and a business at exactly $24 million is still free to choose two-monthly, right up until it goes over that mark.

Why cashflow, not just turnover, decides the best choice

Turnover tells you which frequencies you are allowed to use. It does not tell you which one actually suits your business, and that is where cashflow comes in. A business that generally owes GST, because it sells more than it buys in most periods, benefits from filing less often: the GST it has collected from customers sits in its bank account for longer before it must be paid across, which is a genuine, interest-free cashflow advantage. A business that generally receives a refund, because it makes large GST-bearing purchases, exports zero-rated goods and services, or is in a start-up phase spending more than it earns, benefits from filing more often, since that refund arrives sooner and can be put back into the business. Many exporters choose monthly filing for exactly this reason, even though their turnover would allow six-monthly filing.

Changing your filing frequency

You are not locked into the frequency you started with. You can ask Inland Revenue to change your GST filing frequency through myIR at any time, and the new frequency generally takes effect from the start of your next taxable period. You must still meet the turnover test for whichever frequency you request, so a business that has grown past $500,000 can no longer choose six-monthly filing, even if it filed that way in the past. Growing businesses should recheck their frequency periodically rather than assuming the setting from registration day still fits.

Filing frequency is not the same as accounting basis

It is easy to confuse filing frequency, how often you file a return, with accounting basis, when you recognise GST on a transaction. Accounting basis is a separate choice under section 19 of the GST Act 1985 between invoice basis, where GST is recognised when you invoice or are invoiced, payments basis, where GST is recognised when cash actually changes hands, available up to $2 million turnover, and a hybrid of the two. You can be on any accounting basis alongside any eligible filing frequency, and changing one does not automatically change the other. See the GST Accounting Basis Switcher for that separate decision.

Who this calculator is for and what it assumes

This calculator is for GST-registered sole traders, contractors, and small to medium business owners who are choosing a filing frequency for the first time, or reviewing whether their current frequency still fits their turnover and cashflow as the business changes. It assumes the turnover figure you enter is genuine GST-exclusive taxable turnover for a 12-month period, and that your cashflow pattern, generally paying or generally receiving, is a reasonably settled pattern rather than a one-off month. The recommendation is general planning guidance, not a legislative requirement, since you remain free to choose any frequency you are eligible for. Always confirm your actual eligibility and any change of frequency with Inland Revenue or a registered tax agent.

Frequently Asked Questions

What are the GST filing frequency options in New Zealand?

New Zealand has three GST filing frequencies: monthly, two-monthly, and six-monthly. Two-monthly is the default frequency Inland Revenue applies when you register. Six-monthly is available if your taxable turnover is $500,000 or less in a 12-month period. Monthly is optional for smaller businesses and compulsory once turnover exceeds $24 million in a 12-month period.

Can I choose six-monthly GST filing?

Yes, if your taxable turnover does not exceed $500,000 in a 12-month period. Six-monthly filing means only two GST returns a year, which suits small businesses with straightforward, low-volume transactions that typically owe rather than receive GST.

When does monthly GST filing become compulsory?

Monthly filing becomes compulsory once your taxable turnover exceeds $24 million in any 12-month period, under sections 15 and 15B of the Goods and Services Tax Act 1985. Below that threshold, monthly filing is optional and can be chosen by any registered business.

Does my cashflow position matter, or is it just about turnover?

Turnover sets which frequencies you are legally allowed to use. Cashflow decides which of those eligible options actually suits you. Businesses that regularly receive GST refunds, such as exporters or those with large capital purchases, often prefer to file more frequently so that cash comes back sooner. Businesses that typically owe GST often prefer to file less frequently, holding the GST they have collected for longer before paying it over.

Can I change my GST filing frequency later?

Yes. You can apply to Inland Revenue through myIR to change your filing frequency at any time. The change generally takes effect from the start of your next taxable period, and you must still meet the turnover eligibility for whichever frequency you choose.

What is the difference between filing frequency and accounting basis?

Filing frequency is how often you submit a GST return, monthly, two-monthly, or six-monthly. Accounting basis is how you recognise GST on a transaction, invoice, payments, or a hybrid basis, a separate choice governed by section 19 of the GST Act 1985. You can hold any accounting basis alongside any eligible filing frequency.

Is two-monthly the default when I register for GST?

Yes. Two-monthly is the standard frequency Inland Revenue applies when you register for GST, unless you specifically request six-monthly or monthly filing and are eligible for it.

Can I file more often than my turnover requires?

Yes. Any GST-registered business can choose to file more often than its turnover strictly requires. A small business under $500,000 turnover could still choose monthly filing if it wanted more regular visibility of its numbers, or if it usually received GST refunds.