1. Thats the first question you need ask yourself.
2. Does Thailand have a tax treaty with your resident country?
3. Are you retired or still working?
4. If working who is collecting your tax?
DTV won’t allow you to work here. Normally taxes are collected in the country you are working.
Yes need to wait but if you are here over 6 months then you would be considered a “resident” but not necessarily as a tax resident. I believe where you may have issues is if you have private investments and dividends and bring that money into Thailand with first paying taxes in the country the “income” was derived. Basic accounting!
but they could. It’s more up to the airline. They F up they get fined and have to transport you back. But if you’re legit and can prove it shouldn’t worry.