Tax Return Deadline Australia 2026 (Individuals)
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Primary tax-year context: Current Australian tax settings
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General information only. Speak with a registered tax agent for advice.
The 2025-26 tax return covers income earned 1 July 2025 to 30 June 2026. Here are the key deadlines.
Self-lodgers: 31 October 2026
If you are lodging your own tax return through myTax, the deadline is 31 October 2026.
If 31 October falls on a weekend or public holiday, the deadline moves to the next business day. Check the ATO website closer to the date if you are cutting it fine.
Important: This deadline applies regardless of how complex your return is. If you miss it without contacting the ATO, penalties apply automatically.
Tax agent clients: extended deadlines
Registered tax agents have pre-arranged lodgment programs with the ATO that give their clients more time. The extended dates depend on your circumstances:
| Situation | Due date |
|---|---|
| Most individual returns lodged by a registered agent | 31 March 2027 |
| Returns where agent requests extension | 15 May 2027 |
| High-balance or prior-year-outstanding returns | 31 October 2026 (same as self-lodge) |
The critical rule: You must be registered with a tax agent before 31 October 2026 to access these extensions. If you engage an agent after 31 October, you are already late — the extended dates do not apply retroactively.
First-time lodgers
If you have never lodged an Australian tax return before, your deadline is 31 October 2026, regardless of whether you use an agent. The extended agent dates apply from your second year onwards.
If you are unsure whether you need to lodge at all, the ATO’s “do I need to lodge?” tool on their website will give you a definitive answer based on your income type and level.
Prior-year outstanding returns
If you have one or more prior years where you have not lodged, the ATO may require you to lodge all outstanding returns by 31 October 2026, even if you are using a registered agent. Your agent will advise you on this — it is one of the first things they check.
Lodging prior-year returns is always better done voluntarily rather than waiting for the ATO to contact you.
Late lodgement penalties
The ATO issues a failure to lodge (FTL) penalty for returns not lodged by the due date.
- Penalty = $330 per 28-day period the return remains unlodged
- Maximum penalty: $1,650 (5 penalty units)
- For high-income earners (income over $1M), the penalty is multiplied
In addition to the FTL penalty, the ATO may issue a default assessment — their estimate of what you owe, which is often higher than your actual liability. You then have to lodge to dispute it.
Interest (GIC) also applies to any tax debt from the original due date, compounding daily.
Voluntary disclosure reduces penalties
If you lodge late but before the ATO contacts you, penalties are routinely remitted or significantly reduced. If the ATO has already written to you about a missing return, penalties are much harder to waive.
If you are behind on lodgements, engage a registered agent and lodge as soon as possible.
When to lodge: wait for pre-fill
The ATO pre-fills your return with data from employers, banks, health funds, and other sources. This data is typically available in full by late September each year.
Lodging in July or August risks lodging with incomplete data — you may miss income items (causing an amendment later) or overclaim deductions based on partial data.
For most people, the optimal window is October, once pre-fill is complete and before the 31 October deadline.
Payment deadline
Lodging your return and paying any tax owing are two separate obligations. If your return shows a tax liability:
- The ATO issues a notice of assessment after lodgement
- Payment is due 21 days after the notice of assessment is issued
- If you lodge in October, you typically owe by November
If you cannot pay in full, contact the ATO before the due date to arrange a payment plan. GIC accrues on unpaid amounts regardless, but a payment plan prevents enforcement action.
Sources (verified)
Next step
- Estimate likely position with the Tax Return Calculator
- Cross-check taxable income in the Income Tax Calculator