remember that any income not declared (and tax paid upon) in Australia can't be used to calculate serviceability here, either.
so heading overseas on $250k a year as a non-resident means no bank will look at your last $500k income across 2 years as a "private contractor".
pay the tax here though through your still-current ABN, and it's all good.
same goes for income quarantined overseas as part of international tax agreements - like CF+ USA property .... quarantined = quarantined, basically if you don't pay tax on it, you can't claim the serviceability.
i wonder if that's a cartel system via the RBA and ATO? i wonder.