NZ Tax Calendar 1 April 2026 to 31 March 2027
17 October 2026 · Guide · Not tax advice
Educational information only. Not tax, legal or financial advice. We are not Inland Revenue (IRD) or ACC and are not affiliated with them. Check ird.govt.nz and acc.co.nz, or ask a qualified tax agent. Last checked against official sources: October 17, 2026. Anything marked expected should be re-checked. Examples use made-up numbers.
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Short answer: These dates apply to people and organisations with a 31 March balance date (the IRD calendar says so). If a due date falls on a weekend or public holiday, you can file or pay on the next business day without penalties (IRD calendar note).
Provisional tax: standard or estimation option (3 instalments)
| Instalment | IRD date | Weekday |
|---|---|---|
| 1 | 28 August 2026 | Fri |
| 2 | 15 January 2027 | Fri |
| 3 | 7 May 2027 | Fri |
Ratio option (6 instalments)
28 June, 28 August, 28 October, 15 January, 28 February, 7 May (IRD).
GST (typical periods for a 31 March balance date)
| Period ending | Return and payment due |
|---|---|
| 30 September 2026 (6-monthly; also 2-monthly) | 28 October 2026 (Wed) |
| 31 October 2026 (monthly) | 30 November 2026 per IRD GST banner (28 November is a Saturday) |
| 30 November 2026 | 15 January 2027 (Fri) |
| 31 March 2027 | 7 May 2027 (Fri) |
| Other months are due on the 28th of the following month (IRD). Check your own periods in myIR. |
End-of-year income tax and income tax return
| Item | Date | Notes |
|---|---|---|
| 2026 end-of-year income tax, no tax agent | 7 February 2027 (a Sunday) | The IRD calendar shows this payment on Tuesday 9 February 2027 because 8 February is the Waitangi Day observed holiday |
| 2026 income tax return (IR3), no agent or extension | 7 July 2026 (already passed) | |
| 2027 income tax return (IR3), no agent or extension | 7 July 2027 (Wed) | Expected: the IRD page states 7 July; the 2027-28 calendar was not available |
| Clients of agents with extension | 31 March 2027 for the 2026 return | IRD calendar |
You can download these dates as a calendar file (.ics) from the calendar and estimator tool. It runs in your browser and stores nothing.
What we could not verify
- The 2027-28 IRD calendar (for 7 July 2027 and later dates).
- Dates for 6-monthly GST filers' provisional instalments.
- Tax rates and brackets, Working for Families, KiwiSaver and other rules are not covered.
- Public holidays (including regional anniversary days) can move dates; we only applied the cases shown in the IRD calendar.
Sources (official)
- IRD, IR328 Tax due date calendar 2026-2027 (April 2026) — official page (read October 17, 2026)
- IRD, Payment dates for provisional tax — official page (read October 17, 2026)
- IRD, Filing GST — official page (read October 17, 2026)