So, if somebody has to pay Thai tax when this is all sorted out, just what is the procedure ? Step #1 would be get a Thai tax number, but can you do your tax return here online, or what ? Back home I can do it online, with most of the data prefilled as employers, banks, etc report all your salary, interest and dividends to the tax office. I've never seen any tax agents here like back home, and my wife has never paid any income tax in her life apparently so she is no help !