For most people the IR3 covers the year to 31 March and is due by 7 July. But being linked to a tax agent can push that out to the following 31 March. Here's how the deadlines work and what happens if you miss one.
The standard 7 July date
The default deadline is easy to remember. If your income year ends on 31 March (which it does for almost everyone), your IR3 is due by 7 July that same year. So the year ending 31 March is filed by 7 July a few months later.
That standard date applies if you're not linked to a tax agent. It gives you roughly three months after year-end to pull your records together, work out your income and expenses, and file. For a straightforward sole trader that's plenty of time; for someone juggling a business and a rental, it can feel tight.
The 7 July date is for filing the return. Any tax owing has its own payment date, generally the following 7 February (or 7 April if you're with a tax agent). It's worth separating those two in your head: filing late and paying late are different things, with different penalties, though missing one often goes hand in hand with the other.
The 31 March extension with a tax agent
Here's the part many people don't realise is available. If you're a client of a registered tax agent, you generally qualify for an extension of time, with returns spread across the year and many not due until the following 31 March, roughly eight months later than the standard 7 July.
That extension does two genuinely useful things:
- Breathing room. You're not scrambling to file by early July. There's time to get records right rather than rushing and risking errors.
- Cash-flow timing. A later filing date, paired with the agent-linked payment date, shifts some of the pressure to a point in the year you can plan for.
| Your status | IR3 filing due |
|---|---|
| Not with a tax agent | 7 July |
| Linked to a tax agent | Spread across the year, often to the following 31 March |
The extension isn't a licence to forget about it, returns are still staged through the year, but it's a real advantage. As your tax agent, getting you onto the extension is one of the first things we do. This is general information; your exact dates depend on your balance date and linkage, so confirm with us or check ird.govt.nz.
Balance dates explained
Your balance date is the day your income year ends, and it's the anchor for all your tax dates. For the vast majority of New Zealand individuals and businesses, the balance date is 31 March, the standard end of the tax year.
Some businesses have a non-standard balance date, with IRD approval, usually because their natural business cycle doesn't fit a March year-end. A seasonal business, for example, might prefer to close its books at a quieter point. If you have a non-standard balance date, your filing and payment dates shift accordingly, so the "7 July" and "31 March" dates above move in step.
- Standard balance date (31 March): the dates in this guide apply directly
- Non-standard balance date: filing and payment dates are calculated from your year-end, not the calendar
Most people never need to think about this, your balance date is 31 March and that's that. But if yours is different, it's important your tax agent works your deadlines from the right date, because a generic "7 July" assumption could put you out of step. We confirm your balance date up front so every date that follows is correct for you.
Late filing — penalties and interest
Missing your IR3 deadline can trigger a few different charges, and it helps to know which is which.
| Charge | Triggered by |
|---|---|
| Late-filing penalty | Filing the return after its due date |
| Late-payment penalty | Paying the tax owing after its due date |
| Use-of-money interest | Tax paid late, accruing from when it was due |
There's another quieter risk to filing late: if a return is overdue, IRD can issue a default assessment, its own estimate of what you owe. These estimates rarely include your expenses, so they're often higher than your real tax. Filing your actual return replaces the estimate and frequently brings the figure down.
The encouraging news is that penalties and interest aren't always set in stone. Where there's a reasonable explanation, or you come forward and file, some relief may be available. The worst move is to keep not filing, because the charges and the inflated estimate just keep growing. See our IRD penalties and interest guide for how each charge works and where relief is possible.
Getting back on track
If you've already missed a deadline, or several, the situation is very fixable, and acting now is almost always cheaper than waiting. The path back is straightforward:
- File the outstanding returns in order. Each year often feeds into the next (provisional tax, losses, credits), so filing chronologically keeps the figures correct.
- Replace any default assessments with your real return, which usually lowers the balance because your expenses come back into the picture.
- Sort out any debt with an instalment arrangement if you can't pay it all at once, and ask about penalty remission where it might apply.
- Get onto the agent extension going forward, so you're not fighting the early-July deadline again.
People often put this off because it feels overwhelming, but the relief of having a plan tends to outweigh the dread very quickly. If you're behind, our catch-up tax returns service is built exactly for this, and most clients are surprised how manageable it turns out to be once it's underway.
How we keep you on time
The simplest way to never worry about IR3 deadlines is to have someone watching them for you. As your tax agent, that's exactly what we do:
- Link you to the agent extension so your returns spread across the year instead of crowding 7 July.
- Diarise every return well ahead of its due date and prompt you for records in good time, so nothing is left to the last minute.
- Confirm filing with IRD and tell you plainly what to pay and when, with no vague "sometime soon".
- Catch up any prior years first if you're behind, so the whole picture is current and correct.
The result is that deadlines stop being your problem. You hand over records when we ask, and the dates are managed in the background. That's the real value of an agent here: not just the return itself, but never being caught out by a date again.
This page is general information only, not personalised tax advice. Your exact dates depend on your balance date and agent linkage, so book a free review to talk it through. In plain English: your IR3 is due 7 July if you go it alone, but linking to a tax agent can push it out to the following 31 March and take the deadline off your plate entirely.
This is general information, not personalised tax advice.See our full disclaimer.