if this your first extension then it MUST BE THE 800K. At the same time you can start depositing 65k for 12 months BEFORE the next date of you application for your next yearly extension
I'm expecting everyone who isnt submitting a tax return in their home country to have ALL money they send to Thailand taxed by the Thai authorities before long
Has to be obtained at your Embassy in Thailand. If you been previously married you will need the divorce papers. If your former spouse is deceased then you will need the death certificate.