Better to just arrive and get 30 days visa exempt then go to immigration on final day (verify immigration holiday dates) and get 30 day extension. Much easier and no pre-planning involved (other than spending a few hours to complete extension step).
Chris Howard The definition of the service that an agent provides varies, but they simply 'facilitate the process' on your behalf. The end result is the same, you get legal retirement residence status and legal stamps in your passport. These services are offered for everything, it's a profitable industry that legally operates so until it becomes illegal, it's fine.
has clarified before that once you use an agent you'll have to continue using agents or exit/re-enter to start over in order to switch to the non-agent process.
re: baht - money tied up in investments is irrelevant. You'd still need to lock up 800k (earning nothing). The same 800k can be left in USD and put in a 12mo CD and make a minimum of 4.5%. That's approx
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b - agent fees vary from 30-40k for 1st year, renewal year fees are 15-18k.