| 21 Sep 2021 | August monthly BAS due |
| 30 Sep 2021 | Finalisation due date by payers of PAYG withholding payments reporting through STP for closely held payees |
| 21 Oct 2021 | September monthly BAS due Payment of annual PAYG instalment for 2020–21 |
| 28 Oct 2021 | September quarter BAS due Payment of first PAYG instalment for 2021–22 by quarterly payers |
| 31 Oct 2021* | 2020-21 income tax return due |
| | PAYG withholding annual reports due (no ABN withholding; interest, dividend and royalty payments paid to non-residents; and payments to foreign residents) |
| 21 Nov 2021* | October monthly BAS due |
