| Date | Category | Description |
| 01 Dec 2018 | Income tax | Due date for companies and superannuation funds, that were taxable large/medium entities in the immediate prior year, to pay income tax for the year ended 30 June 2018. The due date for these entities to lodge 2017/18 income tax returns is 15 Jan 2019. |
| 01 Dec 2018 | Income tax | Due date for taxable head companies of consolidated groups (including new registrants), that have a member deemed to be a large/medium entity in the immediate prior year, to pay income tax for the year ended 30 June 2018. The due date for these entities to lodge 2017/18 income tax returns is 15 Jan 2019. |
| 01 Dec 2018 | Income tax | Due date for companies and superannuation funds, that were required to lodge income tax returns on 31 Oct 2018, to pay income tax for the year ended 30 June 2018. |
| 21 Dec 2018 | Activity statements | Due date to lodge and pay monthly activity statements for November 2018. Tax obligations that may be payable include:
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