Tax Return Deadline: What to Check Before 31 October

The tax return deadline is the one date in the financial year that arrives whether you have thought about it or not. For most people it is 31 October, and in 2026 that lands on a weekend, which is exactly the kind of detail that makes people guess.

Guessing is the expensive part. So here is the plain version: who the deadline applies to, what the weekend actually means, what to have ready before you sit down, and what your options are if you are running late or cannot pay. This is general information only. For your own situation, check ato.gov.au or talk to a registered tax agent.

Who the 31 October deadline applies to

If you lodge your own return, whether that is through myTax in myGov or on paper, your return for the 2025 to 2026 financial year is generally due by 31 October. That covers most people who do their own tax.

If you use a registered tax agent, you are usually working to a different date through the agent's lodgment program, which is often later. More on that below, because the timing of when you sign up matters.

Not everyone has to lodge a full return. Some people only need to submit a non-lodgment advice, which tells the ATO you are not lodging this year and why. The ATO has a "Do I need to lodge a tax return?" tool on ato.gov.au, and two minutes with it beats an assumption.

The date, and what the weekend means

The due date for self-lodgers is 31 October, and because that is a Saturday in 2026 the ATO's general rule moves a due date falling on a non-business day to the next business day. Check your own due date in myGov or on ato.gov.au.

The practical takeaway: do not treat a weekend as extra time you can plan around. Work to 31 October in your own head, confirm the date that applies to you in myGov, and give yourself a buffer. A due date that technically shifts is a thin safety net when the thing delaying you is a missing private health statement.

Wait for your pre-fill to finalise

The ATO pre-fills a lot of your return from data it already receives: your income statement from your employer, bank interest, dividends, government payments, private health insurance details and more. Most of it lands during July and August.

Two things matter here. First, your employer needs to mark your income statement as "tax ready" in myGov. Until they do, the figures showing against your name are not final. Second, third party data from banks, funds and health insurers arrives on its own schedule, and lodging before it has all landed is one of the most common reasons a return gets amended later.

Amendments are not a disaster, but they are extra work, and they can change a refund you have already spent. By late October the pre-fill is usually settled, which is one of the few genuine advantages of lodging closer to the deadline rather than in the first week of July. Our guide on whether to lodge your tax return now or wait goes into that trade-off in more detail.

What to have ready before you start

Gather these before you open the return, not while you are halfway through it.

• Your income statement, marked tax ready. Check it in myGov. If you changed jobs, you need one from every employer.
• Bank interest. Every account that earned interest, including the joint one and the one you forgot about.
• Dividends and investment income. Statements from share registries, managed funds or a share trading platform.
• Government payments. Anything from Services Australia that counts as taxable income.
• Private health insurance details. Your statement, which is usually pre-filled but not always.
• Spouse details. Name, date of birth and their taxable income, if you had a spouse at any point in the year.
• Your work-related expense records. Receipts, invoices, logbooks, and your working from home hours if you are claiming them.

If you want a fuller run-through of the prep, we have a whole piece on how to start preparing to lodge your tax return.

Deductions and the rule that decides everything

The ATO sets out three conditions for claiming a work-related deduction on ato.gov.au: you must have spent the money yourself and not been reimbursed, the expense must directly relate to earning your income, and you must have a record to prove it.

That third one is where most claims come unstuck. A deduction you cannot substantiate is not a deduction, no matter how genuinely you incurred it. What counts as a valid record, and what the rules are for the specific things you do, depends on your job and your circumstances, so check ato.gov.au or ask a registered tax agent rather than relying on what a workmate told you. Our overview of what you should or could claim at tax time is a starting point, not a substitute for that.

The receipts problem

Almost everyone hits the same wall in October: the expense was real, the receipt is gone. The ATO's myDeductions tool in the ATO app is built for exactly this. You photograph a receipt when you get it, tag it, and at tax time you upload the lot straight into your return.

It will not rescue this year's missing receipts. It will make next October a completely different experience, and setting it up takes about five minutes.

Using a registered tax agent

If your affairs are more complicated than a single salary and a bit of bank interest, a registered tax agent is worth considering. The timing point matters: if you engage an agent before 31 October, you generally get a later lodgment date through that agent's lodgment program. Leave it until November and you have usually missed that window.

Two checks before you hand anything over. Make sure they are registered on the Tax Practitioners Board register at tpb.gov.au, which is free and takes a minute. And be wary of anyone promising a specific refund amount up front, because nobody can know that in advance, and you are responsible for what is in your return.

If you are late, or you cannot pay

Being late is not the end of the world, but it does have consequences. The ATO can apply a failure to lodge on time penalty, and general interest charge can apply to amounts you owe. The amounts and thresholds change, so check the current position on ato.gov.au. The consistent advice from the ATO is to lodge anyway, even if you are late, because leaving it unlodged does not make it go away.

If you lodge and end up with a bill you cannot pay in one go, contact the ATO before the payment due date. Payment plans exist, and many people can set one up online through myGov for smaller amounts. A tax bill you have talked to them about is a very different situation from one you have gone quiet on. Our guide on how to avoid penalties when doing your tax return covers this ground too.

If the amount owing is going to squeeze your next few pay cycles, it helps to map it against your real spending rather than guess. Budgeting and Insights can show you what is already committed before the bill lands.

What to do this week

• Log in to myGov and check your due date. Do not work from what someone said at work.
• Check your income statement says tax ready. If it does not, chase your employer.
• Open the pre-fill and read it. Look for accounts, funds or payments that are missing.
• Pull your records into one folder. Bank interest, dividends, health statement, spouse income, receipts.
• If you want an agent, book them now. Check the TPB register first, and get engaged before 31 October.

Tax time is mostly admin dressed up as anxiety. Half an hour of gathering, an honest look at your records, and a due date you have actually confirmed will take most of the sting out of it. If your refund comes back smaller than you expected, we have a guide on what to do when your tax refund or estimate is smaller than expected. This article is general information only. It does not take your personal circumstances into account and it is not financial, tax or legal advice.