How do I extend my Non-O visa for another year after the first extension?

For the first year extension you have 800k deposited in a Thai bank in your name at least two months prior to applying. You keep the 800k in the bank for three months and don’t let the balance below 400k. On the following year extension you make sure the balance is back up to 800k two months before applying or alternatively have 12 months of at least 65k international bank transfers in to your account.

If you do opt to switch it’s usually a good idea to put the account back up to 800k two months before applying just in case something happens with the transfer method so you can fall back on the banked money method.