What if I miss the 7 July deadline?

Filing the IR3 after 7 July (when you are not linked to a tax agent) exposes you to a late-filing penalty and to UOMI on any terminal-tax shortfall from the day after the original due date. The faster fix is usually to link to a registered tax agent before 7 July, which automatically extends your due date to 31 March of the following year — provided you are not already overdue on prior years.

Do I file an IR3 if I am only on PAYE?

Most pure PAYE earners do not need to file an IR3. IRD now auto-issues an income tax assessment after year-end based on PAYE data. You only need an IR3 if you had other income (self-employment, rental, foreign income, cash jobs, schedular payments) or if your circumstances trigger an IR3 obligation — for example RWT, working-for-families reconciliation, or end-of-year square-up adjustments IRD flags in myIR.

When does linking to a tax agent change my deadline?

Linking has to happen before the 7 July self-filer due date for the year in question, and you must not be in arrears on prior years. Once linked, the tax-agent extension typically moves your IR3 due date to 31 March of the following year — close to a nine-month extension. Linking after 7 July does not retroactively cure a late filing for that year.

What is the difference between IR3 and IR3NR?

IR3 is the personal income tax return for NZ tax residents. IR3NR is the equivalent for non-residents who have NZ-sourced income (rental, dividends, contracting). Non-residents report only NZ-sourced income and are taxed at non-resident rates, often with NRWT already deducted. If your residence status changed mid-year you may need to file an IR3 for the resident portion of the year.

Key dates Published 2026-06-06 · 6 min read

IR3 due date NZ — 7 July (or 31 March with a tax agent)

By the TaxAccountants.co.nz editorial team · Published 2026-06-06

The IR3 personal income tax return is due 7 July following the end of the income year if you file yourself. Tax-agent-linked filers get an automatic extension, typically to 31 March of the following year. Who has to file, when, and what triggers a first IR3.

In one paragraph

The IR3 covers the income year 1 April – 31 March. Self-filers must lodge by 7 July of the same calendar year. Filers linked to a registered tax agent are covered by the agent’s extension-of-time arrangement and typically have until 31 March of the following year — a near nine-month extension. Terminal tax is due 7 February for self-filers, or 7 April for tax-agent-linked filers. Source: IRD — key dates.

Who has to file an IR3

You are required to file an IR3 if you had any of the following in the income year — self-employment income, partnership or look-through company distributions, rental income, schedular payments, overseas income, more than $200 of resident withholding-taxable interest where the wrong RWT rate was used, or capital-account transactions (such as bright-line property) that produce taxable income. Source: IRD — managing my tax.

Pure-PAYE earners with no other income generally receive an auto-calculated assessment from IRD via myIR rather than filing an IR3. If IRD’s auto-calc throws up an adjustment you disagree with, you can override it via an IR3 filing.

The 7 July self-filer deadline

For the 2026 income year (1 April 2025 – 31 March 2026), the self-filer IR3 is due 7 July 2026. Filing after that date attracts a late-filing penalty plus UOMI on any terminal-tax shortfall from the day after the due date. Source: IRD — penalties and interest.

The tax-agent extension to 31 March

Registered tax agents operate under IRD’s extension-of-time arrangement. Clients linked to an agent before the self-filer due date for the year — and who are not in arrears on prior years — receive an automatic extension. The agent files the IR3 progressively across the extension window, with most returns filed by 31 March of the following year. The terminal-tax due date for linked filers shifts to 7 April. Source: IRD — key dates.

What triggers your first IR3

A common trigger is starting any side income — Uber driving, freelance work, Airbnb hosting, contracting — even if it runs alongside a PAYE job. Other triggers include receiving residential investment income, a bright-line property disposal, or schedular payments. Once you file your first IR3, you typically continue filing in subsequent years until you tell IRD the activity has stopped.

Related on TaxAccountants.co.nz

NZ income tax calculator — estimate your IR3 outcome before filing.
NZ income tax rates 2026 — the brackets that feed your IR3 result.
Student loan repayment threshold — square-up via IR3 if you have other income.
Bright-line property rule — a common first-IR3 trigger.

Need to link to a tax agent before 7 July?

Linking before the self-filer due date moves you into the agent’s extension and gives you until next March to file. We refer every quote request to Lynch & Associates, our Auckland partner firm of CAANZ-member accountants and IRD-registered tax agents, who will reply within one business day.

Get a quote — free for users

Sources

Editorial note: Due dates fall on the next business day where 7 July or 31 March lands on a weekend or public holiday. Verified 2026-06-06.

Disclosure: TaxAccountants.co.nz is an introduction service. Quote requests are referred to Lynch & Associates Chartered Accountants.