Ann: Dorado-2 Drilling Update, page-168

Boz this is a bit late. But what everyone has said on the CGT issue is pretty accurate.

When an Aus resident becomes a non-resident a CGT event arises and you are deemed to have sold them. Similarly, when you return to Aus you also have a CGT event being a disposal as a non resident, then you acquire them as a resident.

There is likely also NZ tax implications as well.

My main question is: when you moved to NZ did you declare yourself as a non resident to the ATO? I'm also guessing you didn't recognise a CGT event when you moved in the first place.

Residency status is also a complex tax area now, so depending on your circumstances you may still be a resident of Aus for tax purposes.

Also, any capital gains with an Australian source earned by a non resident do not get the 50% reduction.