What are the requirements for retiring in Thailand regarding income proof and banking?

I see from a previous post your wife is thai so you have 2 main options

A non-o visa based on marriage which requires 400k baht in a Thai bank

A non-o based on retirement which requires 800k baht in a Thai bank

The retirement option involves less bureaucracy

There are various other retirement options you can look at but that's the easiest

You both need get a thai bank account set up 1st and both deposit 0 baht into account before applying for visa

@Jeff ********

It just has be min 65K baht transferred over sea for twelve consecutive months into you bank account and you can do this transactions yourself from your bank in US.

If you apply for a 90 days Non at home before you leave you can use your bank at home to verify your income. As you’re from the US and your embassy doesn’t offer to provide you a affidavit letter, you’ll need to bank 800K baht in your bank in Thailand within a month to apply for your first year extension of stay. After showing proof of twelve consecutive transactions over sea you can switch to the income method from your second year extension of stay and you don’t need any funds saved in your bank anymore.

It's 800,000 baht in a Thai bank account OR proof of 65,000 baht income per month.

But if you are from a country whose embassy does not provide income verification (many no longer offer this) then your ONLY option is the 800,000 baht in the bank method.