Comment Re:Double Irish (Score 1) 825
I believe if you leave Australia long term or permanently, you'll cease to be an Australian resident as soon as you depart Australia. You may even be able to file your tax return early and possibly get a decent refund (based on having a lower than expected income for the shortened financial year), although unrealised capital gains may be an issue. I don't see anything in the links you gave to contradict that.
I haven't tried emigrating from Australia, but I've done it from a couple of other countries with similar systems and that's how it worked.