Source data
Australian BAS standard deadlines and monthly examples for 2026–27
Sources checked
- 28 October 2026July to September 2026
- 28 February 2027October to December 2026
- 28 April 2027January to March 2027
- 28 July 2027April to June 2027
The timeline shows the four standard dates. The second-quarter deadline falls on a Sunday, so the next-business-day rule applies.
Australian BAS standard deadlines and monthly examples for 2026–27
Federal ATO baseline calendar, checked 11 November 2026. Dates marked Sunday roll to the next business day under ATO rules. Confirm your date on your BAS because concessions, deferrals and local holidays may affect it.
| Source | ||||
|---|---|---|---|---|
| July to September 2026 | Quarterly | 28 October 2026 | Standard date | Source 1 |
| October to December 2026 | Quarterly | 28 February 2027 | Sunday. ATO next-business-day rule applies. | Source 1 |
| January to March 2027 | Quarterly | 28 April 2027 | Standard date | Source 1 |
| April to June 2027 | Quarterly | 28 July 2027 | Standard date | Source 1 |
| November 2026 | Monthly example | 21 December 2026 | Usual monthly rule | Source 1 |
| January 2027 | Monthly example | 21 February 2027 | Sunday. ATO next-business-day rule applies. | Source 1 |
| February 2027 | Monthly example | 21 March 2027 | Sunday. ATO next-business-day rule applies. | Source 1 |
| May 2027 | Monthly example | 21 June 2027 | Usual monthly rule | Source 1 |