Treaty Tie-Breaker

If two countries both treat you as a tax resident, a tax treaty’s tie-breaker decides which one wins, by walking a fixed cascade of tests in order and stopping at the first that gives a clear answer: permanent home, then centre of vital interests, then habitual abode, then nationality.

This tool walks that cascade for your facts and shows the deciding article. If your destination has no treaty with Australia, there is no cascade, and that’s its own blunt warning.