NZ Company GST Filing Frequency: Monthly, 2-Monthly or 6-Monthly? (2026 Guide)

GST Filing Frequency: The Decision Every New NZ Company Must Make

When you register for GST in New Zealand, Inland Revenue asks you to choose a filing frequency. Most new company directors pick without fully understanding the cash flow consequences. Here is what you need to know.

The Three Options

Monthly: Returns due the 28th of the following month. Best for high turnover businesses, exporters, or capital-intensive operations with large GST refunds.

Two-monthly (the default): Returns due the 28th of the month after the taxable period ends. The most common choice for NZ businesses -- balances simplicity with cash flow. Works well for most service businesses billing NZD 60k-M annually.

Six-monthly: Only available if annual GST-exclusive turnover is under NZ00,000. Simplest option but risk of a large lump-sum payment twice a year. Not recommended for businesses with uneven cash flow.

Invoice Basis vs Payments Basis

Separate from frequency, you also choose how GST is accounted for. Invoice basis: GST is returned when you invoice, regardless of when cash arrives. Payments basis: Available if turnover is under NZM. GST is returned when cash is received or paid. Strongly recommended for trades and small professional services firms where invoice-to-cash lag is common.

Which Should a New Company Choose?

• Revenue under NZ00k forecast: six-monthly is administratively simplest if cash flow is predictable.
• Revenue NZ00k-M: two-monthly on payments basis is usually optimal.
• Exporter or high capex: monthly to accelerate refunds.

Common Mistakes

1. Missing the 28th deadline: Late filing penalties start at NZ0 and escalate.
2. Not holding a GST reserve: Open a separate bank account and deposit 15% of every invoice paid into it.
3. Forgetting to register in time: Once you cross NZ0,000 in taxable supplies over any 12-month period, you must register within 21 days.

How Accountants Help New Companies Get This Right

An experienced NZ accountant will model your cash flow forecast, recommend the right combination, and set up your accounting software (Xero, MYOB) to automate GST tracking. If you are an accountant looking to reach new company directors at the exact moment they face these decisions, FreshFirms delivers daily leads of newly incorporated companies filtered by region with director contact details.