Not too bad really for us overseas Australians.
If you took out a HECS (0% interest, indexed to inflation) loan for university study you still need to file taxes when resident overseas and continue making payments if you earn over the threshold.
If you are resident in Australia more then 6mths of the year you must complete an Australian tax return, but for most people that involves logging in around september and checking that all the auto-fills match up with what they expected.