@Mika *******
when you apply for the first one year extension. When you first apply inside Thailand you're given a 90 day visa, which is designed for you to get your Thai bank account, and get your bt800,000 transferred into your account from overseas, and seasoned in your account for two months before you can apply for your first one year extension. You must keep bt400,000 in your account for the whole year. If your account drops below the bt800,000 during the year, the money to bring it back up at least two months before your next year extension can come from anywhere, but the first year extension money must come from overseas.