@John *********
technically correct but when you go to the Revenue Department they ask if you are earning money in Thailand. When you tell them no, that your money comes from Australia they say "you do not need a Tax Number, goodbye" But of course if you go and see a Thai Accountant they will say yes and get you a Tax number because then they can charge you every year to lodge your return. Simple answer, unless your earning money in Thailand, don't worry about it.