that's not true. You're only required to file a tax return if you, as a single person, have 120k baht or more assessable income. You need a TIN if you have 60k baht or more assessable income
you don't understand how CRS works. The financial institutions in your home country are required to report every transaction involving Thailand and Thai tax residents to the Thai authorities. So if you withdraw money at a Thai ATM as a tax resident, for example, it will be reported.
I don't understand how anyone could live here without a bank account for any length of time, not saying it can't be done but certainly inconvenient. Then you have the added issue of CRS reporting from your home country (or where you bank) to Thailand unless you're suggesting people just don't bank anywhere
Anonymous participant ok so you must only be spending savings in Thailand and not income. In which case you need to be able to prove that should you become tax resident and then subject to a tax audit. If you can show that you have savings in a bank account prior to
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/2024 and only transfer those savings to Thailand then that should suffice. Why only those savings? Because savings after that time will have at least an element of income associated which would need to be accounted for.
You will need to change visas. First you find a job then the company will need to provide the paperwork for you to apply for a Non-B visa which you take to immigration and convert the DTV to a Non-B visa