1 December

• Pay income tax for taxable large and medium taxpayers, companies and super funds (lodgment of the return is due 31 January 2027).
• Pay income tax for the taxable head company of a consolidated group with a member deemed a large or medium taxpayer in the latest year lodged (lodgment due 31 January 2027).
• Pay income tax for companies and super funds where lodgment of the tax return was due 31 October 2026.

21 December

• Lodge and pay November 2026 monthly business activity statement.