I've been here 6 years and I know what I can and can not do and don't imagine it will be very different for you. I'm just trying to give advice based on my experience. Take it or leave it, it matters not to me.
I will be in Thailand for less than 180 days this tax year. I plan to sell a property in the uk and believe that the proceeds from the sale will never be taxable when remitted to Thailand because I was not tax resident when i got them. That's how I understand it anyway. Same goes for pension or any other income.
I asked Wise to Tag My Account as always needing transfers tagged as international or ftt. I also use long term stay in Thailand as reason for transfer. I transfer to Bangkok Bank and for 16 months there has been no issue. Both my banking app and bank book show ftt transfers. Transfers to other banks were hit and miss. Swift transfers resulted in my uk current account being closed!
Remember your
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0 baht must be in your account for three months after getting your extension and must not fall below
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0 baht for the rest of the year. This is to meet the requirements of your current extension. Once you have the 12 monthly International transfers to your thai bank you can apply for your next extension using them and release the other
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0 baht. I have just done it and the only complication was that they wanted my uk bank statements to prove where the transfers had come from. It took over an hour for them to check payments out matched payments in. They did not not ask for Wise transfer documents. I also had to provide a copy of my bank book with a transaction on the day which I got from the bank. Nothing else was required from the bank as they accepted the statements I printed out myself ordered from the banking app.
It all went very smoothly but some offices do not accept monthly transfers so make sure you check yours does. I hope that helps and good luck.
My IO have made it quite clear that I must re register tm30 each time I return home after only one night away at another address. I now do it on line. In addition if you file 90 day report on line and your current tm30 does not match the home address it will be rejected. I always file tm30 on line just before 90 day report just to be certain all matches up and do not have any issues. .
and if he is not tax resident in Thailand in any year income received in that year is not taxable when remitted to Thailand. Ie pension payments and anything else earned. Not sure if pension payments are taxable or not.
It is possible you could still apply for the retirement extension if your funds were at
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0 baht for 3 months after you got the last one and you can top it back up 3 months before applying for the best one. The requirement is that your funds do not go below