Each person who applies for a Non-O based on retirement needs 800k in an account in their name. Your wife can't use your account, she needs 800k in her own account if she's on a Non-O retirment.

@Noel ******

60 days

Yes, you can buy a reentry permit at all international airports. DMK has an office with a big sign above the door that says "reentry permit" before you get in line.

You'll need a certificate of residency, workpermit, or yellow book at any branch in CM.

@Sean *******

Happy to help mate. Anything else just ask ;)

@Sean *******

Correct, normally it's easiest to buy the reentry permit at the airport before you fly out. The desk is before the immigration desk.

You do not need a work permit or any specific visa to invest in Thailand. Many people buy condos and rent them out as investment properties. The same with businesses, you can invest in (almost anything).

Non-O based on retirement is single entry, as is the yearly extension. If you want to leave the country you need to buy a reentry permit before you leave. Single is 1000 baht, multiple reentry is 3800 baht (valid for the length of your extension). Note the reentry permit doesn't change any expiration dates, if you're outside when you visa or extension expires you need to start the processes again.

OA extensions require health insurance from one of the 14 Immigration approved Thai health insurers.