How can I obtain a Non-O visa and a yearly extension of stay based on marriage in Thailand?

remember there is a HUGE difference between a year long extension of stay based on marriage from an immigration office and a year-long, multi-entry NOn-O visa based on marriage from a thai consulate.

On the year-long, multi-entry Non-O visa you get stamped in for 90 days, when that runs down you go to the border, stamp out of thailand, stamp in&out of another country and then stamp back into thailand to get another 90 day entry stamp. You do that for the whole year the visa is valid for.

Okay, so right now you're not even married yet? I would say while you're in Singapore getting married, stop at the thai consulate there and get the 90 day Non-O visa based on marriage to a thai from them before you come back

If you are wanting to get a year extension based on marriage from the immigration office I would:

transfer 400K baht into a thai bank account in your name

then go to a thai consulate in either Savannakhet Lao or Ho Chi Minh City Vietnam and apply for a 90 day single entry Non-O visa based on marriage. <- those consulates do not require proof of funds and only minimal documentation to issue the visa.

When you come back into the country you would get stamped in for 90 days. When you have 30 days or less left on that stamp, get the documentation together, update your bank book, get the bank letter etc and go apply for the yearly extension. By that time the 400K baht will have been in your bank account the required 2 months before you apply.

Your application will go under consideration for 30 days then you go back and get the year extension stamped into your passport.

That' what I'd do because it cuts two visits to the immigration office out of your plan because you got the visa from the thai consulate NOT from the immigration office.

You also need to meet the proof of funds by banking 400K baht in a thai bank account in your name only. You cannot use a bank account in another country for proof of funds using banked money method..

Okay, first off IF you're on a visa exempt entry and want to get a 90 day in country Non-O visa based on marriage you need a minimum of 15 days left on your current entry stamp.

That's because applications for in country Non-O visas go under consideration for 14 days before you go back and get it inked into your passport.

Unless you're in Chiang Mai when you need 21 days left on your stamp.