Filing your tax return in Australia is straightforward once you know what the ATO expects. Get it wrong and you risk penalties, missed deductions, and audit triggers.
This guide covers 2026 lodgement deadlines, the documents you need to prepare, the real difference between self-lodging and using a registered tax agent, and the mistakes that cost Australians the most money each year. Whether you are lodging for the first time or managing complex investment income, this is what you need to know.
When is your tax return due in Australia?
Your tax return for the 2025-26 financial year (1 July 2025 to 30 June 2026) is due by 31 October 2026 if you lodge yourself. If you engage a registered tax agent before 31 October 2026, your deadline can extend up to 15 May 2027 under the ATO’s agent lodgement program.
The Australian financial year ends on 30 June. The ATO opens online lodgement through myGov and myTax from 1 July, though many pre-fill data feeds (PAYG income statements, bank interest, dividends, private health insurance) do not finalise until mid-to-late July. Most accountants advise waiting until at least 31 July to lodge to avoid filing with incomplete information.
If you self-lodge through myTax, your hard deadline is 31 October. Miss it and the ATO applies Failure to Lodge (FTL) penalties of $330 per 28-day period overdue, up to a maximum of $1,650, plus general interest charges on any unpaid tax.
Engaging a registered tax agent changes this entirely. The ATO operates a staggered lodgement program for agents, which moves your deadline to a date that depends on three factors:
Your prior-year lodgement record- A clean history typically secures a 15 May 2027 deadline.
The complexity of your tax affairs- Tax liabilities above $20,000 in the prior year may bring an earlier date.
Whether you have overdue returns- Outstanding prior-year returns remove the extension and revert your deadline to 31 October.
First-time clients of a registered tax agent with no overdue returns are usually granted the standard 15 May deadline.
What documents do you need to file your tax return?
To lodge an Australian tax return you need records of all income earned during the financial year, evidence for any deductions you plan to claim, and your personal identification details. Most income data is now pre-filled by the ATO from third-party sources, but you remain responsible for completeness and accuracy.
Income documents
PAYG income statements from each employer
Allowances, bonuses, and termination payments (ETP summaries)
Government payments (JobSeeker, parental leave pay, age pension)
Bank interest statements
Dividend statements from shares and managed funds
Rental property income and expense statements
Foreign income records
Capital gains records from sale of shares, property, or crypto assets: company tax return records ready if the business operates as a Pty Ltd
Deduction documents
Work-related expense receipts (uniforms, tools, professional memberships, subscriptions)
Home office records (hours worked, energy and internet costs)
Vehicle logbook or kilometre records
Self-education and training receipts directly connected to current employment
Charity donations to deductible gift recipients
Income protection insurance premiums
Tax agent fees from the prior year
Personal details
Tax File Number
Bank account details for any refund
Spouse income details if applicable
Private health insurance statement
HELP or HECS debt balance
For Melbourne residents working in trades, healthcare, education, or property investment, deduction records are typically where the largest legitimate claims are lost. Keeping receipts digitally throughout the year is significantly faster than reconstructing them in October.
Should you self-lodge or use a registered tax agent?
Self-lodging through myTax suits people with straightforward affairs: a single PAYG income, standard deductions, and no investment or business activity. Using a registered tax agent makes sense once your situation includes investments, rental property, a side business, or any uncertainty about what you can legitimately claim. The agent fee is itself tax-deductible the following year.
myTax is usually sufficient if you have:
One or two PAYG employers
Bank interest under $1,000
Standard work-related deductions under $300 (no receipts required)
No rental property, investment portfolio, or business income
No capital gains events during the year
You should engage a tax agent if you have:
Investment property income or capital expenses
A share portfolio with dividends, franking credits, or capital gains
Cryptocurrency transactions
Sole trader or business income: small business tax obligations differ significantly from individual returns
Salary sacrifice arrangements, novated leases, or fringe benefits
Foreign income or foreign tax credits
An Employment Termination Payment (ETP) or redundancy payout
Deductions above $5,000 that you want defensibly documented
The agent extension is the other major factor. Registering with a tax agent before 31 October moves your deadline to as late as 15 May the following year. This matters when you need extra time to gather documentation, when you owe tax and want to defer payment, or when your records are not yet complete.
A registered tax agent must be on the Tax Practitioners Board (TPB) register. Always verify the agent’s registration before engaging them. Unregistered preparers cannot legally charge a fee to prepare your return, and they leave you exposed if the ATO queries the lodgement.
What tax return mistakes cost Australians the most money?
The four mistakes the ATO sees most often are claiming work-related expenses without records, omitting income (especially from share sales, side businesses, or rental property), claiming personal expenses as work expenses, and lodging late. Each one increases the chance of an audit and creates penalties or backdated tax.
Claiming deductions without supporting records
The ATO matches deduction claims against industry averages and third-party data. Claims that exceed typical patterns for your occupation trigger reviews. If you cannot produce receipts or written evidence, the deduction is disallowed and you owe the tax plus interest.
Forgetting capital gains
The ATO receives data from share registries, property settlement agents, and major cryptocurrency exchanges. Sales of shares or investment property are visible to the ATO even if you forget to declare them. The same applies to managed fund distributions, which often include a capital gains component you must report separately.
Claiming the wrong work-from-home method
From 1 July 2024, the ATO accepts a fixed rate of 70 cents per hour worked from home, or the actual cost method with full receipt evidence. Each method has different record-keeping requirements. Mixing methods, or claiming the fixed rate without contemporaneous timesheet evidence, is one of the most common audit triggers.
Missing the deadline
Self-lodgers who miss 31 October face $330 every 28 days up to $1,650, plus general interest charges on any unpaid tax. The cheapest fix is to engage a registered tax agent before 31 October, which automatically grants an extension into the following year.
Frequently asked questions
How long does it take to get my tax refund?
Most refunds from electronically lodged returns are processed within 14 days. Returns lodged on paper take up to 50 business days. Refunds are paid by direct deposit to the bank account listed on your return.
Can I lodge my tax return without a PAYG summary?
Yes. Since 2019, employers report income directly to the ATO through Single Touch Payroll. Your income statement appears in myGov and pre-fills automatically into myTax once your employer marks it as final, usually by 14 July.
What happens if I have not lodged tax returns for several years?
Lodge them as soon as possible. The ATO offers remission of Failure to Lodge penalties in some circumstances, particularly where you voluntarily come forward. A registered tax agent can usually negotiate penalty remission and structured payment arrangements. Continued non-lodgement can lead to default assessments and debt recovery action.
Do I need to lodge a tax return if I earned under the tax-free threshold?
You may still need to lodge a return or submit a non-lodgement advice, even if your income was below $18,200. Reasons include receiving Centrelink payments, having tax withheld from any source, running a business as a sole trader (no minimum applies), or wanting to claim back PAYG amounts already withheld.
| Speak to RPS Accountants about your tax return
Filing a tax return correctly the first time saves money, time, and the risk of an audit. The team at RPS Accountants helps individuals, families, and businesses across Melbourne’s northern suburbs lodge accurate, optimised tax returns each year.Find out more about our tax services or reach out directly below. To discuss your 2025-26 lodgement or book a tax planning consultation, contact RPS Accountants on 1300 110 120 or visit 136 Gateway Boulevard, Epping VIC 3076. |
