Does the 400,000 THB financial proof apply for only the initial 90-day Non-O Visa or also for an extension in Thailand?

you can technically get roughly 15 months out of a non-o multiple visa

@Ja***

, You have a year-long, multi-entry visa which means every time you enter thailand for the validity of the visa you're stamped in for 90 days.

You can be out of the country for long as you want. As long as you re-enter on or before the "enter before" date on your visa (which in your case is the 7th of Nov 2018) you'd get stamped in for 90 more days.

one more thing about that year-long, multi-entry Non-O is you can get about 17 months of in-country stay out of that visa. Make sure you border-bounce one final time just prior to the "enter before" date on the visa itself, that gets you 90 days and takes you to the 15th month, then you can apply for the 60 day visit family extension at the immigration office for 1900 baht which requires no financial proof and takes you to 17 months.

Okay

@Ja***

, the way that visa works is you get stamped in for 90 days and when that winds down you exit/re-enter the country to get another 90 day stamp. You do this for the validity of the visa (1 year).

You NEVER do a 90 day report at the immigration office because on that visa you can't stay longer than 90 days.

Now if you want to convert the visa to a year extension of stay based on marriage at the immigration office for 1900baht you'd show the 400K baht in the bank the requisite amount of time before you apply for the extension or show a letter from your consulate stating you have 40K baht in income per month.

You could apply for a yearly extension when you have 30 days or less left on your admitted until stamp.

The 400k doesn’t apply for the single entry 90 day non o. You will need it only when you apply for the extension when in Thailand.

If you can go to the thai consulate in Savannakhet Lao or Ho Chi Minh City Vietnam. Neither of those require ANY financial proof, and you can get either a 90 day single entry, or a year-long multi-entry Non-O based on marriage to a thai from them with just the marriage certificates, and copies of your thai wife's i/d and house book listing.

What country are you applying for it in?

The requirements vary from consulate to consulate. If it says that on their website then it's a requirement.