Australia Tax Return Due Date: Your Essential 2025 Guide

Feeling overwhelmed by Australia’s tax deadlines? Don’t panic—whether you lodge yourself or work with a tax agent, knowing the right dates can help you stay ahead and stress‑free.

✅ Key takeaways

• 31 October 2025 is the firm deadline if you lodge your own tax return (self‑lodger) via myTax, paper, or other DIY methods. 

• 15 May 2026 may be your extended deadline if you use a registered tax agent and join their client list by 31 October 2025. 

• This extension gives you more than six extra months for gathering receipts, maximising deductions, and ensuring accuracy. 

• For businesses—such as companies, trusts, and partnerships—lodgement timelines differ and often stretch beyond individual deadlines. 

• Most small businesses file Business Activity Statements (BAS) quarterly, due on the 28th of the month following each quarter. 

• Missing your deadline triggers Failure to Lodge (FTL) penalties every 28 days and General Interest Charge (GIC) on unpaid tax—both can compound quickly. 

• You can request a lodgement extension directly from the ATO (if self-lodging) or via your tax agent—but note, an extension applies only to lodging, not paying; interest still accrues from the original due date. 

• A registered tax agent offers more than deadlines—they help uncover deductions, mitigate audit risk, and handle ATO communications when needed. 

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Ready to stay on top of your tax deadlines? Read the full 2025 tax return guide on Baron Accounting for all the details, strategies, and expert advice to simplify tax time.
— Read the full guide on Baron Accounting

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