ATO Date Calculator
ATO Deadline Calculator
Key ATO Deadlines for 2026
| Obligation | Due Date | Who |
|---|---|---|
| Individual Tax Return (self-lodged) | 31 October | Individuals not using a tax agent |
| Tax Agent Lodgement | 15 May (following year) | Individuals using a registered tax agent |
| Monthly BAS | 21st of following month | Businesses with GST turnover > $20M |
| Quarterly BAS (Q1: Jul–Sep) | 28 October | Most small businesses |
| Quarterly BAS (Q2: Oct–Dec) | 28 February | Most small businesses |
| Quarterly BAS (Q3: Jan–Mar) | 28 April | Most small businesses |
| Quarterly BAS (Q4: Apr–Jun) | 28 August | Most small businesses |
| Super Guarantee | 28th after quarter end | Employers |
| FBT Return | 21 May | Employers with FBT liability |
Understanding ATO Lodgement Rules
- Weekend/public holiday rule — If a due date falls on a weekend or public holiday, the lodgement date moves to the next business day
- Tax agent extensions — Using a registered tax agent gives you extended lodgement deadlines, but only if you were registered with them before 31 October
- Late lodgement penalty — The ATO may charge a Failure to Lodge (FTL) penalty of $313 per 28-day period (up to 5 periods, max $1,565 for individuals)
- Interest on late payments — The General Interest Charge (GIC) accrues daily on outstanding amounts
BAS Reporting Methods
The ATO offers several BAS reporting methods depending on your business size and structure:
- Monthly — Required for businesses with GST turnover exceeding $20 million
- Quarterly — Most common for small businesses. Four quarters aligned to the financial year
- Annual — Available for businesses with GST turnover under $75,000 (or $150,000 for non-profits)
Frequently Asked Questions
When is my tax return due in Australia?
If you lodge your own tax return, it is due by 31 October each year. If you use a registered tax agent, the deadline is extended to 15 May the following year (provided you registered with them before 31 October).
What happens if I miss an ATO deadline?
The ATO may charge a Failure to Lodge penalty of $313 per 28-day period (up to $1,565 for individuals). Outstanding tax debts also accrue the General Interest Charge (GIC) daily.
When is my BAS due?
Quarterly BAS is due on the 28th of the month following the end of the quarter. Use the calculator above to find your exact due date based on your BAS period.
Can I get an extension on my ATO deadline?
Yes, you can request an extension through your myGov account or by calling the ATO. Extensions are considered on a case-by-case basis. Using a registered tax agent automatically extends most deadlines.