The basic rule of thumb as told to me by an sydney based O/S tax specialist is :-
Do you PLAN on being out of the country for next 2 years?
If the answer is yes, you can inform the ATO you are becoming a non resident for tax.
If you return to AUS for holidays training etc will not effect your tax residency unless you are in AUS for greater than 180 days per Fin year.
You will not effect your residency even if your wage/salary is paid into a bank account in Aus.
If you really wanted to know perhaps you could ask some of the QANTAS staff posted in cities outside australia.......
