Taxes are the top stress point we hear about from business owners. To help you stay on top of things, here are the key dates for the 2026-2027 tax year.
Please note, these dates apply to businesses with a balance date of 31 March and should be used as a guide only. For more personalised tax assistance, book a free, no-obligation chat.
Scroll down for all the key dates to keep your business running smoothly all year round!
Dates & Details
2026
28 Aug — AIM instalments are due if you have a March balance date.
28 Aug — GST return and payment is due for the taxable period ending 31 July.
28 Aug — Provisional tax payments are due if you have a March balance date
28 Sep — GST return and payment is due for the taxable period ending 31 August.
28 Sep — AIM instalments are due if you file GST monthly and have a March balance date.
28 Oct — AIM instalments are due if you have a March balance date.
28 Oct — GST return and payment are due for the taxable period ending 30 September.
28 Oct — Provisional tax payments are due if you have a March balance date and use the ratio option.
30 Nov — AIM instalments are due if you file GST monthly and have a March balance date.
30 Nov — GST return and payment is due for the taxable period ending 31 October.
2027
15 Jan — AIM instalments are due if you have a March balance date.
15 Jan — GST return and payment is due for the taxable period ending 30 Nov.
15 Jan — Provisional tax payments are due if you have a March balance date
28 Jan — AIM instalments are due if you have a March balance date.
28 Jan — GST return and payment is due for the taxable period ending 31 December.
09 Feb — End-of-year income tax is due, unless your tax agent has an extension of time to file your income tax return.
1 Mar — Provisional tax payments are due if you have a March balance date and use the ratio option.
1 Mar — AIM instalments are due if you file GST monthly and have a March balance date.
1 Mar — GST return and payment is due for the taxable period ending 31 January.
30 Mar — AIM instalments are due if you file GST monthly and have a March balance date.
30 Mar — GST return and payment is due for the taxable period ending February.
Disclaimer: We do our best to keep this calendar updated on a monthly basis. It includes the main dates relevant to small businesses in NZ. For the full list of dates visit the IRD Calendar
GST Due Dates
Dates for GST returns will depend on your financial year end and frequency.
FAQs about tax deadlines
What if a due date falls on a holiday?
If a due date falls on a weekend or public holiday, your return or payment may be processed the next working day without a penalty being applied. Where a payment due date falls on a provincial anniversary date, this only applies if you're in the province celebrating the holiday.
What should I do if I miss a tax deadline?
If you miss a tax deadline, it's important to take action as soon as possible to minimise any penalties or interest charges. Contact the IRD immediately to discuss your situation. Options include: online via myIR or IRD's self-service line on 0800 257 777. You can also reach out to our team for assistance in managing late filings and setting up a plan to stay on track in the future.