1 December 2025
- Pay income tax for taxable large and medium taxpayers, companies and super funds. Lodgment of return is due 31 January 2026.
- Pay income tax for the taxable head company of a consolidated group with a member deemed to be a large or medium taxpayer in the latest year lodged. Lodgment of return is due 31 January 2026.
- Pay income tax for companies and super funds when lodgment of the tax return was due 31 October 2025.
21 December 2025
- Lodge and pay November 2025 monthly business activity statement.
21 January 2026
- Lodge and pay quarter 2, 2025–26 PAYG instalment activity statement for head companies of consolidated groups
- Lodge and pay December 2025 monthly business activity statement except for business clients with up to $10 million turnover who report GST monthly and lodge electronically.
31 January 2026
- Lodge TFN report for closely held trusts if any beneficiary quoted their TFN to a trustee in quarter 2, 2025–26.
- Lodge tax return for taxable large and medium entities as per the latest year lodged (all entities other than individuals), unless required earlier.
