21 April

• Lodge and pay quarter 3, 2026–27 PAYG instalment activity statement for head companies of consolidated groups.
• Lodge and pay March 2027 monthly business activity statement.

28 April

• Lodge and pay quarter 3, 2026–27 activity statement, if lodging by paper.
• Pay quarter 3, 2026–27 instalment notice (Form R, S or T).

30 April

• Lodge TFN report for closely held trusts if any beneficiary quoted their TFN to a trustee in quarter 3, 2026–27.
• Lodge lost members report for 1 July 2025 – 31 December 2026.