I am an Australian citizen. I have been a US Tax Resident for calendar years 2020 - 2024. I intend returning to Australia in mid-January 2025. I will be lodging a US Tax Return for 2024, that covers the Australian Tax Year 2024/25 period 1 July to 31 December 2024. I will do less than 183 days in Australia from arrival to 30 June 2025.
Question:
(1) Do I prepare an Australian Tax return and only report on taxable income (world-wide) from my date of arrival (say 20 January) to 30 June 2025?
(2) As a foreign resident for Tax purposes for 2024 (Jul - Dec) will there be any retroactive tax for differing % rates between the US and Australia or is my US Tax Return and taxes paid to the IRS considered a closed matter?