There you are wrong. Income from prior years, aka savings from before you became tax resident, are never taxed. Not now, not tomorrow, not next year.
If you have 500 million baht in your foreign bank account on dec 31st, and you become tax resident in the next year, you can bring this money to Thailand tax free. No tax is charged on old income from years before you became tax resident. Nothing, zero, zip, zilch.
Any money you owned in the year prior to becoming a Thai tax resident remains untaxed now and in any subsequent year - under current law. You are, like many, worried about something which isn’t \ won’t be a problem at all.
Chill, relax, come to Thailand and enjoy a well deserved retirement. I wish you peace and happiness.
We have a special interest group on facebook for those who want to discuss immigrant related tax issues:
Yes, they do. Shady agencies open an account in your name without giving you access and temporarily deposit 800k. Then they bribe the IO and basically you will need them every consecutive year to extend.
This is the most shady (and expensive) way to buy your way into Thailand.
On top of that, if someone in Immigration figures out that your former application / visa was illegal you might get banned for a few years… Especially the guy who took the bribe a year earlier because he needs to protect his ‘business’.
… but you knew this of course before you came to Thailand because you planned your holiday well and was aware that you in no possible way could stay more than 60 days when arriving without visa.
Good to see that your careful planning was confirmed by the immigration office.
Obviously your careful planning made you buy a ticket back home, so with all the wisdom you have gathered you can be assured that your return ticket is on exactly the right day.