My pension is in draw down status. I don’t have to take any of it and can bring money into Thailand from my savings instead. I can take from my pension pot what I like and when I like, it is not an annuity
As I understand it , money generated before Jan 2024 is tax exempt, after this date it is taxable at 30% for farang if already taxed in UK at 20% Thai government take the 10% balance. They treat savings as non taxable but you may have to prove it