Tax Return Deadline 31 October 2026: What You Need to Know

Doing your own tax return this year? You have until 31 October 2026. That’s the tax return deadline for anyone lodging their 2025–26 return themselves, without a registered tax agent. Miss it, and you could face penalties and wait longer for your refund. 

This guide is for you if you’re an employee, a sole trader, or someone with side income or investments, such as rent, shares or crypto. 

By the end of this guide, you’ll know: 

• the exact date you need to lodge by 
• who has to lodge a tax return 
• what happens if you’re late 
• how a tax agent can give you more time

When is the 2026 tax return deadline? 

The 31 October tax deadline 2026 applies to anyone lodging their own 2025–26 tax return. The 2025–26 financial year covers the income you earned from 1 July 2025 to 30 June 2026. 

Self-lodging? Your deadline is 31 October 2026. 

Note that 31 October 2026 falls on a Saturday. When a due date lands on a weekend or public holiday, the ATO lets you lodge on the next business day. That means you can lodge on Monday 2 November 2026 without being late. 

Still, it’s best not to count on those extra two days. Finding missing receipts or statements always takes longer than you expect, and last-minute rushing leads to mistakes. Aim to lodge well before the end of October. 

Do you need to lodge a tax return? 

Now that you know the date, the next question is whether it applies to you. Most working Australians need to lodge, but not everyone. 

You usually need to lodge a tax return if you: 

• earned more than $18,200. This is the tax-free threshold. If your income was above it, you’ll generally need to lodge. 

• had tax taken out of your pay or other income. Lodging is also how you get back any tax you overpaid. 

• earned income with an ABN, even a small amount. This includes all sole traders, plus anyone with side work such as freelancing, rideshare driving or running an online store. 

• earned rent, sold shares or crypto, or made a capital gain. You need to report investment income even if you also have a regular job. 

There are other situations too, such as receiving certain government payments. 

What if none of these apply to you? You may still need to tell the ATO. This is called a non-lodgment advice, and it’s due by the same 31 October deadline. 

If not sure where you stand, use the ATO’s ‘Do I need to lodge?‘ tool, or ask us.

What happens if you miss the 31 October deadline?

First, don’t panic. Lodging late is common, and it can be fixed. It still helps to know what could happen, so you can act early. 

If you miss the deadline, here’s what you might face: 

• Late tax return penalty: the ATO can charge a failure-to-lodge penalty of $330 for every 28 days your return is late, up to $1,650. 

• Interest on tax owed: if you owe tax, the general interest charge (GIC) adds up every day. Since 1 July 2025, you can no longer claim it as a tax deduction. 

• Refund delays: if the ATO owes you money, you won’t get it until you lodge. 

• ATO action: you may get reminder letters. In some cases, the ATO can send you a tax bill based on its own estimate of your income. 

The ATO can reduce or cancel a late tax return penalty in Australia in some situations, but there’s no guarantee. The sooner you lodge, the less you’re likely to pay. 

Can’t pay? Lodge on time anyway. You can set up a payment plan. Lodging and paying are separate steps. Lodging on time avoids the late lodgment penalty, even if you need longer to pay the bill. 

How a tax agent can extend your due date 

Running short on time? A registered tax agent can help. This is called a tax agent lodgment extension. You may be eligible for an extended lodgment deadline by engaging a registered tax agent before 31 October. Most eligible clients will have until 17 May 2027 to lodge their 2025-26 tax return. However, your actual due date will depend on your circumstances. 

The catch: you must be on the agent’s list before 31 October. If you sign up after the deadline, the extension doesn’t apply. The later date may also not apply if earlier tax returns are still overdue. 

A tax agent can also help you: 

• claim more: find deductions you may have missed 

• avoid problems: make fewer mistakes and reduce the chance of an ATO review 

• save time: have one point of contact with the ATO, so you don’t have to deal with it alone 

• get a deduction: claim the agent’s fee in next year’s tax return

Don’t leave it to the last minute 

The simplest way to avoid penalties is to lodge before the tax return deadline or to join a tax agent’s client list before then.

Already behind on past tax returns? You’re not alone. It’s more common than you’d think, and it can be fixed. 

Talk to our team today to find out how we can help. Contact us on 08 6288 8670 or email us at admin@accforit.com.au to discuss your options. 

This article is general information only and doesn’t take your personal circumstances into account. Please speak with a registered tax agent before making any decisions.