Key Inland Revenue dates for the 2026–27 tax year (1 April 2026 to 31 March 2027).
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Second provisional tax instalment
For 2026–27, if your residual income tax was over $5,000. GST for November and December is also due.
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Terminal tax for 2025–26
If you don't have a tax agent. 7 February is a Sunday and 8 February is the Waitangi Day holiday.
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End of the 2026–27 tax year
Also the deadline for 2025–26 returns filed through a tax agent with an extension.
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Terminal tax for 2025–26 (with a tax agent)
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KiwiSaver year ends
Put in at least $1,042.88 between 1 July 2026 and today to get the full $260.72 government contribution.
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2026–27 income tax return (IR3) due
If you don't have a tax agent or an extension.
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Terminal tax for 2026–27
If you don't have a tax agent; 7 April 2028 with one.
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Source: Inland Revenue IR328 tax calendar 2026–27 and provisional tax payment dates; dates from August 2027 use IR's weekend rule. If a date falls on a weekend or holiday, the deadline is usually the next working day; the dates above already allow for that where the tax authority says so.