31 March 2026

• Lodge tax return for companies and super funds with total income of more than $2 million in the latest year lodged (excluding large and medium taxpayers), unless the return was due earlier.
• Payment for companies and super funds in this category is also due by this date.
• Lodge tax return for the head company of a consolidated group (excluding large and medium), with a member who had a total income in excess of $2 million in their latest year lodged, unless the return was due earlier.
• Payment for companies in this category is also due by this date.

21 April 2026

• Lodge and pay quarter 3, 2025–26 activity statement if lodging by paper.
• Pay quarter 3, 2025–26 instalment notice (form R, S or T). Lodge the notice only if you are varying the instalment amount.

30 April 2026

• Lodge TFN report for closely held trusts if any beneficiary quoted their TFN to a trustee in quarter 3, 2025–26.