What Are the Requirements to Apply for a 90-Day Non-O Visa in Thailand Based on Retirement?

okay people this is what the stamps look like going from a 30 day visa exempt entry to a Non-O in country visa, a 90 day stamp and finally a year extension with a re-entry permit.

The bank letter you need looks like this;

First off did you go to the immigration office and get the handout that lists the requirements as far as documentation to apply for the in country 90 day Non-O visa?

You need at least 21 days left on your current 30 day visa exempt, 60 day tourist visa OR a 30 day extension from one of those entry stamps.

You get a letter from the bank stating you opened the account on xxx date, and as of today it has xxx baht in it (I think you need that letter to be dated the same date as you apply for the 90 day Non-O visa in Chiang Mai) . You update the bank book on the date you apply to show the current balance.

AFAIK there is no requirement that the 800K baht be in the account any length of time when applying for the 90 day Non-O VISA. (that comes into consideration ONLY when you apply for the yearly extension after you get this first Non-O visa and new 90 day entry stamp)