Thank you, I kept the 800.000 until I renew this month and change to monthly transfer method. I went to immigration, when applied for re entry permit 2 months ago, and they said, that bankstatement is fine and not need from embassy. In my case impossible, my income is payback from a loan, and it not taxable.
I went to immigration in Jomtien. They accept a proof of monthly transfer, of minimum 65.000 bht. If stated by bank, over the last 12.000 bht. Then no month can be missing though. I asked, because I am tired to hold 800.000 in bank.
Relax. All too soon. And indeed it a question if you have to fill in a tax declaration as you probably be exempt. Once it is clear you see your answer everywhere on the net.