This potential taxation change may not be as bad as we think it is, for those who are residents in both Thailand and another country and have most assets in the other country in which that country has a DTA with Thailand. It is bad for those who are only a resident in Thailand or whose other residency doesn’t have a DTA with Thailand. Or the DTA specifies that the income can be taxed by Thailand.
I’ve given a brief read on the Canada-Thailand DTA, and my gosh it is hard to read, I’ll have to read it a few more times or hopefully someone here has also taken a read and understand this DTA. It sounds like for a Canadian resident (as determined by the DTA, and you can only be resident of one contracting state in the DTA, which as long as you have a permanent home available, such as a family home not even owned by you and where the majority of your assets are, so doesn’t matter if you stay in Thailand 365 days a year and haven’t been in Canada for even years), interests and capitals gains from Canadian sources are only taxable in Canada, not in Thailand. Assuming your main source of income is from the stock market or savings accounts, Thailand will not be taxing any of those. Now, for actual income, which I guess is what taking money out of a registered retirement savings account is, this I don’t know yet.
This seems to be not too big of a change for those who intend to be paying taxes where they’re from. For those who rely on being solely a Thai resident and store their monies in perhaps Singapore and remit their estimated yearly expenses into Thailand first day of year, to not pay any taxes anywhere, then this tax change may have a large impact.