Pay income tax for taxable large/medium taxpayers, companies and super funds. Lodgment of return is due 15 January 2019. Pay income tax for the taxable head company of a consolidated group with a member deemed to be a large/medium taxpayer in the latest year lodged. Lodgment of return is due 15 January 2019. Pay income tax for companies and super funds when lodgment of the tax return was due 31 October 2018.