| Date / Period | Event / Deadline |
|---|---|
| 1 July 2026 | Start of new financial year; self-lodgement of 2025-26 individual returns opens. |
| 28 February 2026 | BAS due date for Quarter 2 (Oct–Dec 2025) (quarterly lodgers). |
| 28 April 2026 | BAS due for Quarter 3 (Jan–Mar 2026). |
| 28 July 2026 | BAS due for Quarter 4 (Apr–Jun 2026). |
| 15 May 2026 | Lodgment (and payment) due date for most individuals, trusts, and companies using a registered tax agent. |
| 5 June 2026 | Final concessional lodgment / payment date for returns due 15 May (for individuals and trusts) where refund-oriented or non-taxable. |
| 31 October 2026 | Deadline for annual GST return for eligible small-turnover GST-registered businesses (if electing annual GST reporting). |
| 21st of each month | Due date for monthly BAS (if GST turnover requires monthly reporting). |
For the tax year in Australia, business owners file their income tax returns between 1 July and 31 October unless they’re registered with a tax agent. If you’re registered with a tax agent before 31 October, your tax return deadline may be extended until 15 May the following year (e.g. your tax return for 24/25, would be due on 15 May 2026).
Here are some other important tax deadlines in Australia for you to remember:
If you've missed a deadline, you may be liable for interest or penalties if you didn’t lodge or pay your taxes on time. You can find more details on ATO’s website. If you can’t make a payment on time, get in touch with the ATO or your accountant to see if you can set up a payment plan using instalments.
Filing your taxes and meeting your Australian tax deadlines doesn't have to be a headache. You've got options: tackle it yourself, or let a professional accountant or tax agent ease the burden.
Planning ahead is essential for any business owner, and our accountants at Beany suggest setting aside 30% of your gross income in a separate bank account for taxes (e.g., GST, FBT and income tax). This strategy helps prevent cash flow issues when tax deadlines roll around.
Equally important is maintaining your accounting records, such as receipts, bank statements, invoices, etc. The ATO requires you to keep these records for at least 5 years, so staying organised is crucial.