Do you need 800k THB in a bank account for the 90-day Non-O visa?

Yes

simple answer: YES, you do

The financial requirements for the Non-Imm-O retirement visa got changed about one week ago

if you are applying for the "90 days Non-Imm-O Retirement/over50 visa" in your home country, you

either

need proof of the equivalent of 800,000.- THB in your home currency on any bank account in your name,

or

the proof of income (an income affidavit) from an authority in your country, over a minimum of 65.000.- THB equivalent in your home currency. . .

You are also able to use the combination method, a mix of deposit and income, which must be a minimum of 800,000.- THB yearly

THESE financial requirements for the Application of the E-Visa in your home country have changed, THEY ARE NEW (!!) and have appeared in the E-visa sytem about one week ago. . . . . .

which means, that the financial proof for the application to the visa, now requires the SAME amounts than the applications for the "1-year Extension of Stay" at the Immigration offices inside Thailand . . . . . . . .

So, there are no more surprise moments at Immigrations inside Thailand, because the requirements for the visa in the old days used to be lower, and it wasn't anywhere noted on embassy websites, that they would be higher for the Extensions.

If you are from USA you can print out your income which stays how much you get each month It’s not from the embassy but I do know when I applied for OA visa the Thai embassy in USA excepted for funds

Yes, I do. Can you give one to me 😁

2000 USD is enough or equivalent in €

Yes unless you're from a country whose Embassy still does the income Affadavit

I did this in June this year, yes you need it!

IF you are applying for a non-O based on being 50 or over and IF you are applying at an immigration office inside of Thailand, then yes, you need the 800k baht in a bank account that was transferred in from overseas to be able to apply.