Haha, I’ll never criticize for being over-careful with any tax authority. I might have something funny to say if you are so overcareful that you only go outside wearing a helmet for fear of crashing planes, but not for this.
I won’t file at all, as I will have only tax-exempt (by tax treaty) pensions from which I will bring money into Thailand. Savings/investments, and their interest/dividend incomes are no issue at all if they are not a part of any monies brought in. It will be quite easy for me if anything comes up in the future. I need only show my sources and amounts of income. Unless what I bring in exceeds those sources (showing them that I have other sources that may not be exempt) no problem.
It’s only savings deposited before 2024 that’s non-taxable. If you were a Thailand tax resident for the tax year 2023, other monies above your pre-2024 savings amount remitted to Thailand is taxable income (subject to whatever exemptions that may or may not apply). If all of your money brought into Thailand is part of savings that was saved pre-2024, you’re good to go. Is that what you’re saying, just differently?
Though I have read that we may need to be able to show our source(s) of income, eventually, to prove it. (If our remittals/ ATM withdrawals are more than the amount of the tax-exempt source, it will be a red flag for them.) It would pay to be prepared just in case. Printing out a statement from the tax-exempt source should do it.
It’s a good question, put that way (I said the same thing in another comment). In all the tax stuff I’ve read the past few months, those who talk about it dont explain this. It’s never brought up except to say “what you bring in will be taxed, including from a savings account.” Nothing I’ve read says “unless it was already taxed as income.” But I’m sure I haven’t seen everything. There might be something else out there….