Okay
@Louise ********
let's see if we can get this train wreck of a post back on the rails.
FIRST you need to understand HOW an OA visa works. That visa is good for a year from the date it's issued and is good for unlimited entries during that validity. EACH entry will get the holder stamped in for a year (or as long as their health insurance is valid for up to a year).
SO when your husband enters on the OA visa the first time, he will show his insurance policy and they will stamp him in until that date runs out (up to a year).
NOW after he's been in country 90 days he will have to file a 90 day report <- which is just a form that says he didn't leave the country and is free to do. There is NO requirement to proof funds or anything when filing a 90 day report. It's due 89 days from the date you enter the country and you can file one 2 weeks before up to 1 week after the due date at the immigration office in the area where you live.
The way people get TWO years of stay out of an OA visa that is valid for a year IS, just before the visa STICKER expires you exit/re-enter the country with a new year insurance policy and you will get another year entry stamp.
As far as meeting the proof of funds to get a yearly extension INSIDE the country at the immigration office by using monthly income method, IF you work that visa correctly <- get the 'free' second year. You wouldn't need to start transferring in the requisite 65K baht a month until after you'd been here 10 months or so because the requirement to get a year extension is you need to transfer in a minimum of 65K baht, each month, every month into a thai bank account in your name only from abroad for the previous 12 months before you apply for your yearly extension <- and IF you get two years out of that visa you wouldn't apply for a yearly extension for almost 2 years after your original entry. You'd need to start bringing in the funds just as the FIRST year stay is running out so that when the second year stay runs down you have 12 months of transfers to go get a yearly extension.