Got the top point - if I leave Australia for 11 months and live in 3 different countries none of them for 6 months, and do this year after year - do I keep Australia tax residency?
TLDR : Answer Summary
If you leave Australia for 11 months and live in multiple countries without meeting the 6-month residency requirement in any, you may still retain your Australian tax residency. Essential factors include maintaining a permanent home in Australia. However, understanding the implications of not being a tax resident, along with the requirements to prove your residency status, can be complex.