All above advice is correct - FYI both extensions by marriage I have had with kk they have not asked to see bank book on return even though I kept the 400k balance and took it with me 👍
hi Tod - just for info - kk io would not accept this letter in English when I renewed last month - I had to go back and get a Thai version - even bank teller looked bemused ( The same io accepted it in English last year🤷♂️)