For many Australians, the key question is simple: when is my tax return actually due? The answer matters because missing a lodgment date can lead to failure-to-lodge penalties, interest on unpaid tax and unnecessary stress, particularly when you are already managing a business, employees or cash flow.
For most people who lodge their own individual return, the usual cut-off is 31 October after the end of the financial year. However, that is not the only deadline that may apply. Tax agents, companies, trusts, self-managed super funds and GST-registered businesses can all have different obligations and dates to manage.
The usual cut-off date for individual tax returns
Australia’s income year generally runs from 1 July to 30 June. If you prepare and lodge your own individual tax return, it is usually due by 31 October following the end of that income year.
For the income year ending 30 June 2026, 31 October 2026 falls on a Saturday. That means the practical lodgment deadline moves to the next business day, Monday 2 November 2026.
This applies whether you are:
- An employee with salary and wages income
- A sole trader lodging an individual tax return
- An investor with rental property, dividend or capital gains information
- A contractor who earns income in their own name
- A retiree or part-year worker who needs to lodge a return
Not everyone has to lodge an individual tax return every year. For example, some people with very simple affairs may not have a lodgment requirement. If you are unsure, it is better to check rather than assume that no action is needed. A non-lodgment advice may be appropriate where you do not need to lodge.
The 31 October date is a lodgment deadline, not necessarily the date your tax debt must be paid. That distinction is important.
Using a registered tax agent can change your lodgment date
A registered tax agent may be able to lodge your return after the standard 31 October cut-off under the ATO’s tax agent lodgment program. This can be useful for people with more complex affairs, including business owners, property investors, trusts or taxpayers waiting on information from managed funds or other investment providers.
However, engaging an accountant in November does not automatically create extra time.
To access a tax agent’s extended lodgment arrangements, you generally need to engage the registered tax agent before the standard individual deadline. For the 2025–26 income year, that means arranging representation before the end of October 2026, rather than waiting until after the self-lodgment deadline has passed.
A later tax-agent deadline is also not guaranteed for every client. Your available date can depend on matters such as:
- Your lodgment history
- Whether earlier returns, BAS or other obligations are overdue
- The type of entity involved
- Whether the return is expected to result in tax payable
- Whether the ATO has issued a specific due date or requirement
- Your tax agent’s own lodgment program and capacity
If you already have overdue returns, it is especially important not to assume that you can simply join a tax agent’s standard schedule. The ATO may require overdue obligations to be brought up to date before later arrangements are available.
Businesses, companies, trusts and SMSFs do not all share one deadline
There is no single tax-return cut-off date that applies to every Australian business structure.
A sole trader is generally different from a company. A sole trader usually reports business income and deductions in their individual tax return, while a company lodges a separate company tax return. A trust, partnership and self-managed super fund also have their own annual return requirements.
This means the right question is not only, “When is tax due?” It is also, “Which return is due, and who is lodging it?”
Sole traders
If you operate as a sole trader, your business income is generally included in your individual tax return. If you lodge it yourself, the usual individual deadline applies. If you use a registered tax agent, a later date may be available if you engage them in time and meet the relevant conditions.
Partnerships and trusts
Partnerships and trusts generally need to lodge separate tax returns, even though the income may ultimately be assessed to the partners or beneficiaries. The relevant lodgment date may differ from the dates that apply to an individual self-lodger.
Trustees should also plan well before year-end. Preparing a trust return often depends on finalising accounts, reviewing beneficiary information and making valid distribution decisions under the trust deed and relevant tax rules.
Companies
A company has its own tax return, tax file number, records and payment obligations. Company return deadlines can vary depending on the company’s circumstances and whether it is lodging through a registered tax agent.
Company directors should not treat a company return as an extension of their personal return. The company’s accounting records, tax return, BAS obligations, payroll reporting and director responsibilities need to be managed separately.
Self-managed super funds
An SMSF has a separate annual return and regulatory obligations. Its annual return can include income tax reporting, supervisory levy information and member-related reporting.
The ATO has published separate lodgment arrangements for SMSFs, including different treatment for self-prepared funds, tax-agent clients and newly registered funds. SMSF trustees should confirm the date that applies to their fund rather than relying on an individual tax-return deadline.
For businesses and entities, the most reliable practical approach is to check the due date shown in the ATO’s online services or confirm it with your registered tax agent.
Lodging your return and paying the tax are separate obligations
A common mistake is to focus only on getting the return lodged. Lodgment is important, but it does not remove the obligation to pay any tax assessed by the due date.
For individuals who lodge their own return between 1 July and 31 October, a tax bill is generally due on 21 November. If the assessment is issued after 31 October, the payment date is generally 21 days after the assessment issues.
If you lodge your own return late and it results in tax payable, the usual 21 November payment date can still apply. In other words, delaying the return may not delay the tax debt. Interest may be imposed on unpaid amounts after the payment due date.
This is one reason why it is often better to lodge a complete and accurate return promptly, even if you need help managing the payment. If cash flow is tight, contact the ATO early or seek professional advice about payment arrangements. Ignoring the issue can make it harder to resolve.
Tax-agent clients may have different payment arrangements, particularly where returns are lodged under the agent program. For some individual and trust clients, payment dates can depend on when the return is lodged and processed.
Do not overlook BAS, GST and other business deadlines
Your annual tax return is only one part of your tax compliance calendar. If you run a business, you may also need to lodge and pay BAS, PAYG withholding, GST, PAYG instalments and superannuation obligations during the year.
For quarterly BAS reporters, the standard dates are generally:
- 28 October for the July to September quarter
- 28 February for the October to December quarter
- 28 April for the January to March quarter
- 28 July for the April to June quarter
Monthly BAS obligations are generally due on the 21st day of the following month. Annual GST returns are generally due on 31 October, unless you are not required to lodge an income tax return at that time, in which case a later date may apply. Registered tax and BAS agents may have access to different arrangements for eligible clients.
Superannuation guarantee obligations also need to be managed separately. Employers are generally required to ensure contributions are received by employees’ funds by the quarterly due dates. Paying late can trigger the superannuation guarantee charge regime, which is more costly and administratively demanding than simply making the contribution on time.
A well-organised business calendar should therefore track more than EOFY. It should include BAS due dates, payroll finalisation, super payments, annual tax returns, ASIC obligations where relevant and any state-based taxes that apply to the business.
What happens if you miss the deadline?
The ATO can apply a failure-to-lodge penalty where a return, statement or other required document is not lodged in the approved form by its due date. This is not limited to income tax returns. It can also apply to obligations such as BAS and other tax documents.
For a standard failure-to-lodge penalty, the law calculates the amount by reference to penalty units. The base penalty is one penalty unit for each period of 28 days, or part of a period, that the document remains overdue, up to a maximum of five penalty units.
As at the current legislation compilation, a Commonwealth penalty unit is $330. This means the standard maximum base failure-to-lodge penalty can reach $1,650. Larger entities can face increased penalties under the legislation, so the final amount is not necessarily the same for every taxpayer or business.
Late lodgment can also cause broader problems, including:
- General interest charge on unpaid tax liabilities
- Delays in receiving refunds or processing other ATO matters
- Difficulty accessing tax-agent lodgment concessions
- Increased scrutiny of outstanding obligations
- Complications when applying for finance, selling a business or updating business structures
- Additional director-risk issues where company tax and super obligations are not managed properly
The ATO may issue a failure-to-lodge penalty before or after the overdue document is lodged. Receiving a penalty notice is therefore not a reason to delay further. Lodge the outstanding return or statement as soon as possible, then address the penalty and any tax debt.
If you cannot lodge on time, act before the due date
Missing a deadline does not always mean a penalty is inevitable, but waiting until after the date makes the situation harder.
Where exceptional or unforeseen circumstances prevent timely lodgment, a registered tax agent may be able to request a lodgment deferral. A deferral gives extra time to lodge without incurring a failure-to-lodge penalty, but it needs to be handled properly and should not be treated as a routine extension.
If a penalty has already been applied, the ATO has discretion to remit it in full or in part depending on the circumstances. Severe illness, natural disasters, serious disruption to records or technology, and other events genuinely outside a taxpayer’s control may be relevant.
Being busy, going on holiday or overlooking reminders will not usually be strong reasons on their own. The ATO’s published administrative guidance also indicates that remission is generally considered after the overdue document has been lodged and the taxpayer can explain what caused the delay and what steps were taken to fix it.
For example, a sole trader may be waiting on records following a serious system failure or flood damage to their premises. Rather than simply missing the deadline, they should contact their accountant promptly, gather replacement records where possible and consider whether a deferral request is appropriate. If a penalty is later imposed, the evidence of the disruption and the steps taken to resolve the problem may be important.
Keeping your tax calendar under control
The most useful deadline is the one you plan for early. Waiting until late October can be risky, especially if you need to reconcile bank accounts, finalise payroll, obtain investment statements, review vehicle expenses or confirm deductions.
A practical checklist is to:
- Start gathering records soon after EOFY
- Reconcile business income and expenses regularly throughout the year
- Keep receipts, invoices, logbooks and supporting documents organised
- Check whether you have any overdue ATO obligations before tax time
- Engage a registered tax agent well before the individual lodgment deadline if you need help
- Set reminders for BAS, superannuation and annual return obligations
- Contact the ATO or your adviser early if you expect payment or lodgment difficulties
The key takeaway is that 31 October is the usual individual self-lodgment cut-off, but it is not the only tax deadline that matters. Your actual obligations may be different if you run a company, use a trust, manage an SMSF, lodge BAS or work with a registered tax agent.
This article is general information only and is not personal financial or tax advice. Your lodgment and payment obligations depend on your circumstances, entity structure and ATO account status. Speak with a registered tax agent or accountant, such as, for advice tailored to your situation.