there's a lot of people who contribute their time, effort and knowledge into making this group the go-to group on the inter-web for entry/visa/extension info to Thailand..
Do a transaction then update the bank book the day you go for the 90 day Non-O visa and it'll show the balance that day
Have the bank print you a 3 month detail transaction report (which is all that's required when you apply for the initial 90 day Non-O) on the spot when you get them to write/print the standard bank letter
At MOST offices that bank letter and the transaction report can be up to 7 days old and still be used
There are three things you need from the bank when you use "banked money method" for visa/extensions
** a detail transaction report
** a "standard" bank letter (which is like 5 lines says your name, your account number and the balance the day they wrote the letter)
** update your bank book on the date you apply for the Non-O visa/extension
It's that last one; update the bank book, that require many people to have a transaction the date you need the updated bank book. Because for many banks a bank book won't update with the current date unless there's a transaction done that date.
you don't need to do any transaction to get the bank to give you a detail transaction report OR the 'standard' bank letter, only when you update the bank book AND it also doesn't matter if the ending balance on the detail transaction report, the standard bank letter and the bank book don't match 😮 As long as you're over the threshold required (which for retirement visa/extension is 800K baht in the account) you're fine.
If you have a year extension and a valid re-entry permit there is no set amount of time you need to spend in country.
As long as you'd come back before your current extension/re-entry expires so you could apply for a new yearly extension you're fine to stay out as long as you want.
this is the back side of that transfer stamp form Chaengwattana uses
make sure you update your bank book the day you go to get the stamps transferred and have a copy of the data page of your bank book and the page showing the current balance
That "show bank book to move stamps" is a bangkok immigration policy only