What are the requirements for a Non Immigrant O Marriage Visa in Thailand?

If you have 30 days leftover on your visa stamp no problem to open account..

Why are you waiting to get your marriage registered in Thailand, do it as soon as possible in case there is a delay and you miss your Visa application date

I don’t see how he is employed if he is here on a tourist visa…..

As per the bank account: it should be a Thai bank account and in the foreigners' own name ...

Generally speaking, after he gets the initial 90 day visa, you and him can go to a bank and open an account (it usually can't be done on a tourist stamp but a longterm visa stamp will work) -- if doing the money in the bank route (which seems maybe the only option for US citizens) do this step within the first few weeks of obtaining the non-o stamp, to ensure it meets the 2 months "seasoning" time prior to applying for the 1 year extension

You need to talk with your local immigration office in advance for details, and get their latest requirements. Some conditions are office-specific.

Q1. some sources say we only need one of these requirements. What is true?

-> Proof of funds for an initial Non-O based on marriage to a Thai is one of:

- banked money of 400K baht in your Thai bank account

- affidavit or letter from your embassy in Thailand (<- which US passport holders cannot use as the US embassy wouldn't issue income affidavits anymore)

A US passport holder, the applicant must use the banked money method (unless he gets to work legally in Thailand).

Q2-1. How do we prove the income?

-> Get the bank letter that states you have an account with xxx baht balance along with transaction history.

(Unfortunately, opening a bank account is out of the scope of this group. Talk with bank branches)

Q2-2. Would it even be possible to prove it with a letter from his employer?

-> Check with your local office if they accept salary slips with a work permit for the initial in-country Non-O visa based on marriage, as many offices don't for an initial visa, but do only for following one-year extensions. If they accept, he may be able to use tax documents from his employer as proof of funds.

Q3. if/how we are able to apply with him being here already

-> Basically, he can apply for in-country Non-O based on marriage to a Thai national at the local immigration office by providing all necessary documents and having enough remaining days with his current stamp.

You need to check these with the local office

- If they do in-country initial visas: there are some small offices that don't process in-country visa applications

- the minimum remaining days requirements: office specific from 15 calendar days to 15 working days

- the minimum period for being married: many offices don't accept visa applications based on marriage immediately after marriage registration. They require you to stay in marriage for a certain period before you apply for the initial visa, for example, a few months. This is also office-specific.