When to Submit Your Tax Return in Australia 2026–27

The Australian income year runs from 1 July to 30 June, and the return you lodge covers that twelve month window. For the 2025–26 income year, lodgment opens on 1 July 2026, and the date most people need to circle is 31 October 2026. That single date shapes everything else, from how quickly your refund lands to whether you cop a penalty for being late.

Below is a plain-English rundown of when to submit your tax return in Australia, what changes if you use a registered tax agent, and which other dates matter if you run a business and lodge BAS.

The 31 October deadline and who it actually applies to

Most individuals who lodge their own tax return must submit it by 31 October following the end of the financial year. If you handle your own return through myTax or on paper, that is your deadline. Not 30 June, not the day your employer hands over your income statement, and not whenever the mood takes you.

For the 2025–26 income year, that puts the due date at 31 October 2026. The ATO treats that date as paramount for self-lodgers, and it does not move because you were busy, because you were waiting on a document, or because you assumed someone else was sorting it.

One practical point that catches people out: the deadline is for lodgment, not payment. You can still receive a bill after 31 October, and that bill has its own due date. Lodging on time does not mean paying on time, and the two are handled separately.

Key 2026–27 tax dates at a glance

The table below pulls together the dates that matter for individuals and for anyone lodging a business activity statement.

Treat the agent date as a guide rather than a guarantee. Not every tax agent client automatically receives the later deadline, and eligibility depends on the arrangements your agent has in place. Confirm it with them before you plan around it.

Why lodging on 1 July is usually a bad idea

It is tempting to fire off your return the moment lodgment opens, especially if you are expecting a refund. The problem is that myTax pre-fills most of your information by late July, and lodging before that data has landed can cause real trouble with the tax office. Filing right on 1 July means you are essentially guessing at income and deduction figures that will be reported to the ATO anyway.

If your pre-filled figures do not match what you submitted, you may need to amend the return later. Amending is not the end of the world, but it slows down your refund and adds admin you did not need. Waiting a few extra weeks for the pre-fill to populate is the lower-stress option.

What happens if you miss 31 October

Missing the deadline does not make the return disappear, and it does not stop the ATO from expecting it. Late lodgment can attract penalties and interest, and the general principle is simple: the sooner you lodge, the lower your penalties tend to be. Leaving a return outstanding for years compounds the problem rather than solving it.

The ATO does not necessarily issue a fine the instant the clock ticks over. Enforcement varies, and many people who lodge shortly after the deadline come out of it without drama. That said, you cannot rely on being one of them, and the risk grows with every month that passes.

If you have already missed the date, the practical move is to lodge as soon as you have your records together rather than waiting for a perfect set of documents. Penalty amounts, interest rates and remission rules change and are set out on the ATO website, so check there for the current position rather than relying on second-hand numbers.

Using a registered tax agent and the later deadline

Registered tax agents are often able to lodge on a later timetable than self-lodgers, which is one of the main reasons people hand their paperwork over. The extended date commonly cited for agent-lodged returns is 15 May 2027, well beyond the October cut-off.

Important caveat: some sources state that the 2025–26 return remains due on 31 October 2026 even when an agent is involved. That is a genuine contradiction in publicly available summaries, and it is exactly the kind of detail you should confirm with your own agent rather than assume. Ask them directly which date applies to your situation and get it in writing.

Also remember that using an agent does not remove your obligation to supply information. An agent can only lodge what you give them, so getting your receipts, income statements and deduction records to them early keeps the whole process on the rails. If you leave it until the week before the deadline, their ability to help you shrinks fast.

Lodging returns from previous years

Outstanding returns from earlier income years do not expire. You can still lodge tax returns from previous years, and doing so is usually better than continuing to ignore them. The sooner you lodge, the lower your penalties are likely to be, which gives you a straightforward reason to start with the oldest return and work forward.

If you have several years outstanding, an accountant or registered tax agent is often worth the fee. Multiple late returns can be fiddly to untangle, and getting the sequence right matters more than saving a few dollars on preparation.

BAS dates if you are running a business

Quarterly BAS for 2026–27 are due 28 October, 28 February, 28 April and 28 July. These dates sit alongside your income tax obligations and, for many sole traders and small-business owners, the BAS cycle is the one that actually drives the record-keeping routine.

Because BAS lodgment depends on reconciled income, expenses and GST figures, a return that is tidy through the year makes both obligations easier. Chasing twelve months of receipts in October is where most of the pain comes from, not the lodgment itself.

Getting your records sorted before you lodge

Lodgment itself takes far less time than gathering everything you need to do it. A bit of organisation before late October turns a weekend of panic into an hour of data entry.

• Collect income statements and any other income records for the full 1 July to 30 June period.
• Group work-related expenses, donations, and any investment or rental property costs by category.
• Keep receipts and statements together in one place rather than spread across email, the glovebox and a shoebox.
• Check the myTax pre-fill against your own records once it populates, so you are not lodging blind.
• Note anything you are unsure about and raise it with your agent before lodging, not after.

If you track income and expenses as you go, whether in a spreadsheet or a record-keeping tool, the whole exercise becomes reconciliation rather than archaeology. Lodgya's free calculators and tax calendar are built for exactly this kind of planning, and the paid trackers are designed to produce accountant-ready reports when you would rather hand the whole thing over.

None of this is tax advice, and Lodgya is not a registered tax agent. For anything specific to your circumstances, check the ATO website or speak to a registered tax agent.

Thinking ahead to the 2026–27 income year

The 2026–27 income year runs from 1 July 2026 to 30 June 2027. Applying the same rule that governs every other year, the return for that year will be due 31 October 2027 for self-lodgers, with lodgment opening on 1 July 2027. Confirm the exact dates with the ATO closer to the time, since published schedules are updated periodically.

Frequently Asked Questions

When can I lodge my tax return for 2025–26?

Lodgment opens on 1 July 2026. You can technically submit from that date, but it is worth waiting until myTax pre-fills your income information, which typically happens by late July. Lodging before that data arrives risks mismatched figures and a slower refund, so a few extra weeks is usually the smarter play.

What is the deadline if I use a registered tax agent?

Agent-lodged returns are commonly given a later date, with 15 May 2027 often cited as the extended deadline. However, some sources say the 2025–26 return stays due on 31 October 2026 even with an agent. Confirm the applicable date with your own agent before assuming you have extra months up your sleeve.

Can I still lodge a tax return from an earlier year?

Yes. You can lodge tax returns from previous years, and the ATO still expects them. The sooner you lodge, the lower your penalties are likely to be. If you have several years outstanding, a registered tax agent can help you work through them in order and reduce the mess.

What happens if I miss the 31 October deadline?

You can still lodge, but penalties and interest may apply. The ATO does not always issue a fine immediately, and enforcement varies, but the risk grows the longer you leave it. Lodging as soon as your records are ready is almost always cheaper than waiting for a perfect set of documents.

Do I need to lodge a BAS as well as a tax return?

Only if you are registered for GST. Quarterly BAS for 2026–27 are due 28 October, 28 February, 28 April and 28 July. These sit separately from your income tax return, which means keeping income, expenses and GST figures reconciled through the year saves you a lot of scrambling later.