Sadly
@Craig ******
mostly for you. You have a very tenuous grasp of how the proof of funds works for the year extension on an O-A visa
You do it three ways;
Banked Money Method
you bank 800K baht in a thai bank account in your name only for 2 months before you get your extension, you leave it in the account for 3 months after the extension is granted and then the balance can't go below 400K baht the rest of the year
Monthly Income Method
You transfer IN from abroad into a thai bank account in YOUR NAME only a minimum of 65K baht a month, each month, every month for the preceding 12 months before you apply for your extension (they will take the lowest incoming monthly transfer and multiply that by 12 for the amount, they WILL NOT add each one separately for the total)
NOTE: if you come from a country whose consulate here in thailand still issues the affidavit of income from abroad notary document (which the US, UK and Australia no longer do) you use that document to show monthly income and it is accepted without question at the immigration office.
Combination Method
You bank xxx baht in a thai bank account in your name for 2 months before you apply for the next extension (you leave that amount in the account for 3 month after the extension is granted and after that the balance cannot go below 50% of what ever portion you banked
AND
You transfer IN from abroad into a thai bank account in Your Name only the difference each month Every month so when the 12 transfers are added to the amount you banked it is at least 800K baht. They will take the lowest monthly transfer (they will not count them individually) and then average that as the amount brought in over 12 months.
EXAMPLE, you bank 200K baht, that means you need to bring in a minimum of 50K baht a month, each month every month for the previous 12 months (which totals 600K and when added to the 200K banked equals 800K)