OK. When I extended 23 December 2024 I still had the 800K in the bank, properly seasoned in case my proof of income wasn't adequate for them. But I also showed the IO my bank statement with 12 consecutive deposits of > 65K baht. Kasikorn will provide (though not stamped and signed) a credit advice for each month showing when the overseas deposit was made, how much it was for and where it came from (in my case USA SSI). He looked at them checked the dates and compared it to the credit amounts on my bank statement for those days and confirmed it was good. So this extension was based on income. I was done in less than 1 hour. Easiest extension I've done to date.