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GST return due date calculator

Pick the month your GST period ends. You get the date the return and payment are due.

GST return due

Wednesday, 28 October 2026

Period ends
Wednesday, 30 September 2026
Rule
28th of the next month

File and pay in myIR by the due date, or through your tax agent.

When a GST return is due

  • Normally on the 28th of the month after the period ends: a period ending 30 September is due 28 October.
  • A period ending 30 November is due on 15 January.
  • A period ending 31 March is due on 7 May.

Filing frequencies

  • Two-monthly: the default for most small businesses.
  • Six-monthly: if your sales are NZ$500,000 or less a year.
  • Monthly: required once your sales pass NZ$24 million a year; anyone can choose it.

Last updated . This calculator is a guide, not tax advice.

Frequently asked questions

What if the 28th is a weekend?

Inland Revenue moves a due date that falls on a weekend or public holiday to the next working day.

When do I pay the GST?

By the same date as the return. File and pay in myIR, or through your tax agent.

Which sales go in my GST return?

On the payments basis, the payments you received in the period; on the invoice basis, the invoices you issued. Signed-in Invoice Native businesses get a GST101A summary of both.