What are the correct rules for the non-O retirement visa in Thailand regarding entry, bank account deposits, and extensions?

When opening my bank account on 30 day emempt, one problem was the second official ID card. My passport was not enough. I'm from UK and we don't have ID cards. I don't have driving licence either. I was creative and used my bus pass. 😏

Good luck and welcome to LOS joe

Not right at all. All single entry visas issued by a Thai embassy or consulate are valid to enter Thailand for 90 days. That means you you must enter Thailand within 90 days from the day the visa is issued. The expiration date will be written on the visa.

A non-O visa grants 90 days upon entry. That means as long as you enter Thailand within 90 days, you will then receive a stamp for 90 days permission to stay in Thailand.

During this 90 days you will open your bank account and deposit your money. That means you need to move quickly as you'll only have approximately one month to get the account open and the money deposited.

Your money must be in your account for 2 full months as of the day you apply for your extension.