What Are the Current Costs for the Marriage Visa and a Multiple Entry Visa in Thailand?

When you go to apply for your NEW yearly extension you will do it based on marriage to a thai (by meeting the financial requirements AND submitting the appropriate documentation for that type of extension)

Using banked money method for proof of funds you need to have the 400K baht in a thai bank account in your name only for 2 months before you apply for your extension (NOT from 2 months before your current extension expires).

GO to your immigration office with your thai wife in tow and get the hand out that lists the documentation requirements for the yearly extension based on marriage (as it's a LOT more paperwork than the one based on retirement).