Pick a date to see which quarterly BAS it belongs to and when that BAS is due to lodge and pay (self-lodgers, quarterly reporting).
| Quarter | Period | Due date |
|---|---|---|
| Q1 | 1 Jul – 30 Sep 2026 | Wed 28 Oct 2026 |
| Q2 | 1 Oct – 31 Dec 2026 | Tue 2 Mar 2027 (28 Feb is a Sunday and 1 Mar is WA Labour Day, so the ATO moves it to the next business day; aim for 1 Mar to be safe) |
| Q3 | 1 Jan – 31 Mar 2027 | Wed 28 Apr 2027 |
| Q4 | 1 Apr – 30 Jun 2027 | Wed 28 Jul 2027 |
Source: ATO "Due dates for lodging and paying your BAS" (updated 17 Sep 2026): quarterly due dates are 28 Oct, 28 Feb, 28 Apr and 28 Jul, moving to the next business day if the date falls on a weekend or public holiday. The ATO counts a public holiday for the whole of any state or territory as a non-business day everywhere, so WA Labour Day (Mon 1 Mar 2027) pushes Q2 to Tue 2 Mar 2027 (ATO "Lodgment and payment dates on weekends or public holidays", updated 1 Jul 2026). Lodging online may give you 2 extra weeks (not for Q2). Registered tax and BAS agents may have different dates. Your BAS shows your actual due date. General information, not tax advice.
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