I have a delightful and loving Thai wife, she is a treasure so although on a meagre UK pension no way I'd leave her just because venal authorities wish to plunder my pension. BUT my pension already pays medicine for one person monthly and supports two with living expenses monthly. Normally I do bank to bank internet transfers once the pension is transferred from my UK bank via WISE to my Bangkok bank account. So if they choose to tax my pension in spite of a DTA in place, because UK tax is far less than what we are told Thailand will charge us, to limit tax liabilities I have a cunning plan (as Blackadder would say!).
I see from elsewhere on this thread that the tax-free pay is 150,000 p.a, so my cunning plan is to actually transfer via WISE from the UK to myself, my wife, and the other recipients avoiding the money first landing in my BKK account. That way the 150,000 tax free rule will be applied on each of the 4 persons and no tax would be paid on any. We live quite modestly on under thb25,000 a month anyway so no probs. WISE charges on the 4 transfers would be a minimal extra over for 4 instead of current 1 transfer charge so not an issue. We have no debts, got our own truck and a car and a motorbike, a 5 bed-4 bath detached house in a walled village all paid for so it's just food and utility bills plus a bit for the vehicles we need to worry about.
For those supporting others paying them from home country directly via WISE or whoever allows them to use the 150,000 tax free allowance so it does cut down potential taxation by reducing the taxable amounts by 4 x 150,000 (600,000) baht in my case. That more than covers my UK pension which is a bit pathetic, the UK are very mean to their pensioners.