Personally I am not so sure about that - How much longer will 800K Baht be enough? Different Immigration Offices have different document requirements for Visa extensions. The activation of an existing tax rule occured in September 2023 and as far as I can understand applies to that year. But as I said in the original posting clarity, certainty and long termity are not, as far as I can see, part of the culture so it is just that - a (forlorn) wish and I live with it - the alternative is cold, expensive and partnerless