Do I need to deposit 800,000 THB in a Thai bank for my Retirement Visa extension if I already have a Non-Immigrant O Visa?

Good explanation (y)

Do not confuse meeting the requirements to get a Non-O visa from a thai consulate in your country with the requirements to get a year extension of stay from the immigration office inside thailand.

Those two things have nothing to do with one another. 😕

The first year extension your only option is using banked money method. ..

That means you would have to get here, get a bank account open, get 800K baht transferred in, and then once the funds were in the thai bank account in your name only for 2 months you could apply for the year extension based on retirement.

You could also start transferring in to the country a minimum of 65k baht a month, each month every month for the next 12 months and use that as the way you could get your yearly extension NEXT year.