If you lodge your own Australian tax return, the deadline is 31 October for the financial year that ended on the previous 30 June. If you use a registered tax agent and you are on their client list before 31 October, you generally get a later lodgement date, sometimes well into the following year.
That is the short answer. The longer answer is where the useful detail lives, because the date that applies to you depends on a single choice: whether you go it alone or hand the job to a professional.
The headline date: 31 October
For most people lodging their own return, 31 October is the line in the sand. The 2025 to 2026 financial year ran from 1 July 2025 to 30 June 2026, so a self-lodged return for that year is due by 31 October 2026.
A few practical notes that trip people up:
- The deadline applies whether you lodge online through myTax or on paper. There is no separate, later paper deadline.
- If 31 October falls on a weekend or public holiday, the due date usually rolls to the next business day. Check the exact date with the ATO for the year you are lodging.
- You can lodge from 1 July, but it is often worth waiting a couple of weeks. The ATO pre-fills income, bank interest, private health and other data from employers and institutions, and that information is usually complete by late July. Lodging too early, before the pre-fill lands, is a common way to leave money on the table or trigger a later amendment.
If this is your first return in a while, or your affairs have gotten more tangled, it is worth reading our full tax return Australia guide before you start clicking through myTax.
Using a tax agent buys you time
Here is the part that surprises people. If you use a registered tax agent and you are on their books before 31 October, you generally qualify for a later lodgement date, which in many cases extends well into the following year.
The catch is the timing. You have to be registered as that agent’s client before the 31 October cutoff to access the extended program. Walking into an agent’s office in March and expecting a backdated extension does not work. If you have left your own lodgement late and missed 31 October, getting onto an agent’s list quickly is still usually the smartest move, but do not assume the late date will automatically apply, confirm it with the agent and the ATO.
Agents manage their lodgements across a staggered program, so the exact date you get can depend on your lodgement and payment history. Someone who lodges on time every year tends to get a more generous date than someone with a backlog.
Lodge through a registered agent and you usually get longer. Leave it to yourself and 31 October is the date that matters.
Two things worth weighing if you are deciding whether an agent is worth it:
- The agent fee is generally deductible in the following year’s return, which softens the cost.
- A good agent often finds deductions you would have missed. Our rundown of common tax deductions in Australia is a useful starting point so you walk in knowing what to ask about.
What happens if you lodge late
Missing the deadline is not the end of the world, but it is not free either. The ATO can apply a failure-to-lodge penalty, charged in units that accrue for each period your return is overdue, and general interest can build on any tax you owe.
The penalty is more likely to bite if you have tax payable. If you are due a refund, the ATO is generally less aggressive, but relying on that is a gamble, and a string of late lodgements can flag you for closer attention. The amounts and the way penalties are calculated change over time, so confirm the current figures with the ATO rather than assuming last year’s numbers still apply.
One rule matters more than any other here: if you cannot pay, lodge anyway. The penalty for not lodging is separate from the question of whether you can pay the bill. Lodging on time and then arranging a payment plan with the ATO is almost always better than going quiet, because the failure-to-lodge penalty keeps ticking regardless of your cash position.
A quick comparison
| Your situation | Deadline that applies | Worth knowing |
|---|---|---|
| Lodging your own return | 31 October | Wait for ATO pre-fill, usually late July, before you start |
| Tax agent, registered before 31 October | A later date, often well into the next year | You must be on the agent’s list by 31 October |
| Already late | The deadline has passed | Lodge now, arrange a payment plan if needed |
Dates and penalty rules can shift from year to year, so treat this table as a map, not the territory. The current, authoritative dates always sit with the ATO.
A few sensible habits
The people who find tax time painless are not smarter, they are just organised. A folder, digital or shoebox, that collects receipts, donation records, work-related expenses and private health statements through the year turns a stressful October into a 30 minute job.
It also helps to get tax-time admin sorted early rather than scrambling in the last week. If you are mainly lodging because you are chasing money back, our explainer on the tax refund process in Australia walks through how long refunds take and what can hold one up.
This article is general information only and is not personal financial, tax or legal advice. Everyone’s circumstances differ, so consider speaking to a registered tax agent, and confirm current dates, thresholds and penalty figures with the ATO before you act. All figures here were last checked June 2026 and are subject to change.
The bottom line
If you lodge your own return, 31 October is the date to circle for the financial year that ended the previous 30 June. If you use a registered tax agent and get onto their client list before that same 31 October cutoff, you generally earn a later lodgement date, often well into the following year. Either way, if you cannot pay, lodge anyway and sort out a payment plan, because the cost of staying silent is almost always higher than the cost of the bill. When in doubt, check the current rules with the ATO or a registered agent.