your question points towards a plan of government to change the law, so in future they can also tax money which wasn't earned through a thai customer, but still you were here when earning it? these thoughts/plans exist, yet no implementation. it might be difficult to track this money, if it was earned overseas and doesn't touch thai grounds/banks. if it does come to a thai bank, there is a good risk that it might be taxed in future…
completely agree! in the beginning of dtv, there was one essential video of a travel blogger, in which he interviewed a deputy minister. this was most helpful. i hope, this guy moves on and publishes a second clip where he asks about getting an account (legally enabled), 90 days, potential permission to work…
look, your host, landlord etc. needs to file a tm30 regarding your stay. you take a tm30 hardcopy together with your passport, visa, rental agreement etc, go to immigration and get the certificate of residency. always after 90 days, you go to immigration again and file a tm45 (this time you yourself)