The multi entry 1-year Non-Imm-O Family Visa got discontinued by October 2023. Only the 90-days single entry Non-O Family Visa remains.
The 90 days stay permit you receive when you enter Thailand on this visa, you can change into the 1-year extension of the stay permit, then buy a multi re-entry permit, which will allow unlimited exits and re-entries for a full year.
The last ME Non-O Family Visa issued was from the Savannakhet Laos consulate in early 2024, then they also discontinued it.
Now the one-year Extension of Stay Permit literally is the same thing, yet you need to start with the 90-days Non-O Family Visa and fulfill the financial requirements, first for the application to the visa and then for the application to the 1-year extension.
The initial single entry 90-days Non-Imm-O Family Visa gives you a 90-days stay permit when you enter Thailand. The visa itself becomes invalid for further use after you entered.
You can get this stay permit extended for one year. It is called “Extension of Temporary Stay Permit". There is no such thing as a "1-year marriage visa"
Up from 30 days (on some Immigrations up from 45 days) before the expiry of the 90-days stay permit, you can apply for the 1-year extension of temporary stay permit based on being married to a Thai wife, on Immigration. The application fee is 1900 THB.
You will receive a note saying "application under consideration" and a date 4 weeks ahead of the day, when you can pick up your 1-year EoS stamp. Within this 4-weeks period, Immigration is going to conduct a home visit. Once issued the EoS, you can buy a multi re-entry permit for it for 3800 THB, or a single re-entry permit for 1000 THB.
As a citizen of the UK, USA, Canada, Australia and Norway, for the EoS, you need proof of a minimum of 400,000 THB in your Thai bank account in your sole name, "seasoned" for two months on the day you apply, and your bank has to confirm this for Immigration on their “bank letter of guarantee”.
Citizens of aforementioned countries cannot use the "income affidavit" proof because their embassies do not issue it any more. In case your embassy still issues a legalized income affidavit, you are free to use it as proof of finances.
More and more Immigrations will not accept 12 months of transfers from abroad of a minimum of 40,000 THB as proof of finances. You either need to show this kind of income from legally working in Thailand, or you show the income affidavit. Alternatively, you show the 400,000 THB deposit.
The good thing is, after been issued the EoS, you can take the 400,000 THB out of your account and use it for living expenses.
The deposit has to be back in the account two months before the annual application for the next 1-year EoS.
If you use the "retirement extension", the money deposit must be double than that - 800,000 THB, and the money must remain in your account (2 months before, 3 months after, never below 400,000 THB) so the financial proof for married to a Thai is only half of what retired expats need to prove.
Every visa and every stay permit for foreigners is always only temporary. Except if you hold a "Permanent Residency Status" or if you fulfill the requirements for Thai citizenship.
Thailand is no land for “Immigrants”. Being allowed only temporary and having to prove that you have the appropriate means of supporting yourself is the main key for a permit to stay, regardless if married to a Thai or not.