Tax Return Deadline in Australia: Key Dates and Late Penalties
Miss the tax return deadline in Australia and penalties can follow. Learn the key dates, the tax-agent extension, and what to do if you are late.
By Timothy Hirou GaschereauPublished 10 min read
Every year around July, a familiar anxiety sets in for millions of Australians: “When is my tax return actually due? Have I already missed it? What happens if I do?” The questions pile up fast, and the ATO website, while thorough, is not exactly a page-turner.
Here is the short version: the tax return deadline in Australia is 31 October for anyone lodging their own return. If you use a registered tax agent, you may get more time. And if you have already missed a deadline, all is not lost. This guide walks you through every key date, the penalties worth avoiding, and what to do if you owe money you cannot pay right now. It is general information only, not tax advice.
🎯 The essential: Self-lodgers have until 31 October, lodging via myTax through myGov. Tax-agent clients often get until around 15 May the following year, but ONLY if they are on the agent's books before 31 October. Lodging late risks a Failure To Lodge penalty; owing tax risks the General Interest Charge. Even if you cannot pay, lodge on time and set up a payment plan: lodging late and paying late are separate problems.
The key date: 31 October (for self-lodgers)
The Australian income year runs from 1 July to 30 June. Once the year ends, the ATO opens for lodgement. You can technically lodge from 1 July, but wait until your income statement is marked “Tax ready” in myTax (usually late July): pre-fill data from employers, banks and government agencies flows through over July, and lodging too early risks missing information and having to amend later.
Once your data is pre-filled and “Tax ready”, lodge via myTax through your myGov account. The hard deadline for self-lodgers is 31 October. Mark it in your calendar and treat it as firm. New to this? Start with our step-by-step guide to lodging your tax return.
Using a registered tax agent: the later deadline (and the catch)
If you use a registered tax agent, you generally get more time: most individual clients can lodge as late as 15 May of the following year, depending on circumstances and lodgement history. There is one catch that trips people up every year:
You must be on the agent's client list BEFORE 31 October to qualify for the extended deadline. Decide on 5 November that you would like an agent, and you have already missed the window. If you are thinking about it, get on their books before 31 October.
Two more things: check your agent is registered on the Tax Practitioners Board (TPB) register at tpb.gov.au, and note that outstanding prior-year returns as at 30 June can void the extension, so the ATO may require lodgement by 31 October regardless.
| Method | Deadline | Who it suits | Key catch |
|---|---|---|---|
| Self-lodge via myTax | 31 October | Simple situations: one employer, few deductions | No extension, 31 October is firm |
| Registered tax agent | Often 15 May (following year) | Rental properties, multiple incomes, or anyone wanting help | Must be on their books before 31 October |
What happens if you lodge late: the FTL penalty
The ATO can apply a Failure To Lodge (FTL) on time penalty if your return is overdue. In general terms:
- It is one penalty unit for each 28-day period (or part) the return is overdue.
- It is capped at a maximum of five penalty units for individuals and small entities.
- The dollar value of a penalty unit is set by law and indexed, so check the current value on the ATO website rather than trusting a figure that may be out of date.
The ATO has discretion here: if you are due a refund, or it is a genuine one-off, it often does not apply the penalty, or may remit it if you ask. But do not bank on leniency, and remember that lodging late is a separate issue from paying late.
If you owe tax and cannot pay: lodge anyway
The most important line in this article: if you cannot afford your tax bill, lodge your return on time anyway. Lodging late and paying late are two separate problems with two separate consequences. Skip lodging because you cannot pay, and you cop the FTL penalty AND the interest on your debt.
- A General Interest Charge (GIC) accrues on unpaid tax from the due date. The rate is set quarterly, so check the current one on the ATO website.
- You can set up a payment plan with the ATO, online through myGov or by phone, to pay the debt in manageable instalments.
- From 1 July 2025, GIC is no longer tax deductible for interest incurred on or after that date, so resolving debts promptly matters more than ever.
The ATO is not unreasonable when you communicate. Ignoring the problem is always the worst option.
Overdue and prior-year returns: getting back on track
Missed not just this year but a few years? It is more common than you think, and it is fixable. Lodge as soon as possible: the ATO generally takes a more lenient approach when you come forward voluntarily rather than waiting to be chased, and the longer you leave it, the more interest and potential penalties accumulate. A registered tax agent can prepare multiple years of overdue returns, liaise with the ATO, and sometimes negotiate penalty remission. Do not let embarrassment stop you acting: the ATO has seen it all, and would rather you lodge late than not at all.
Pre-lodgement checklist
| Have this ready | Why |
|---|---|
| Income statements 'Tax ready' in myTax | Avoids lodging with missing pre-fill data |
| Bank interest statements | Interest is assessable income |
| Government payment summaries | Centrelink and Services Australia payments |
| Private health insurance statement | Needed for the Medicare levy surcharge and rebate |
| Deduction records | Receipts, logbooks, work-from-home records |
| Rental and capital gains records | Rental income/expenses, shares, property or crypto sold |
| Bank account details | BSB and account number for your refund |
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❓ Frequently asked questions
When is the tax return deadline in Australia?
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For individuals lodging their own return via myTax, the deadline is 31 October each year. The income year runs 1 July to 30 June. You can lodge from 1 July, but it is best to wait until your income statement is marked 'Tax ready' in myTax, usually by late July.
What happens if I lodge my tax return late?
+
The ATO can apply a Failure To Lodge (FTL) on time penalty. It accrues at one penalty unit per 28-day period (or part) overdue, up to a maximum of five penalty units. Check the current penalty unit value on the ATO website, as it is indexed. The ATO may waive the penalty in some cases, such as when you are due a refund, but do not rely on it.
Do I get more time if I use a tax agent?
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Yes, generally. Clients of registered tax agents can often lodge as late as 15 May of the following year. The key condition: you must be on the agent's client list before 31 October to qualify. Verify your agent is registered on the Tax Practitioners Board register at tpb.gov.au.
Is there a penalty if I am due a refund?
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Technically the FTL penalty can still apply, because the obligation to lodge on time exists regardless of the outcome. In practice the ATO often does not apply, or will remit, the penalty when a refund is due, but this is at their discretion. Lodge on time to be safe.
Can I lodge a tax return from a previous year?
+
Yes. You can lodge overdue returns from prior years, and you should do so as soon as possible. The ATO is generally more lenient when you come forward voluntarily. A registered tax agent can help prepare and lodge multiple years of overdue returns and may negotiate penalty remission.
What if I cannot pay my tax bill?
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Lodge your return on time regardless. Lodging and paying are separate obligations. If you cannot pay, contact the ATO to set up a payment plan, online through myGov or by phone. A General Interest Charge (GIC) accrues on the unpaid amount, so the sooner you act, the less it grows.
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Sources
This article is general information only, not tax advice. Deadlines, penalty unit values and interest rates are set by the ATO and change over time. Check the ATO website or a registered tax agent for guidance specific to your situation.
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General information only. This article is educational and does not constitute personal financial advice. It does not account for your circumstances. Consider your own situation and seek advice from a licensed adviser before acting. Read our full disclaimer.
Timothy Hirou Gaschereau
Founder of Snowball Invest, not a financial adviser.
I write about what I'm learning myself, because nobody ever taught us how to take control of our own money. It's a skill, not a mystery, and it's never too late to learn it. The best day to start was yesterday, the second best is today.
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