Do I need an exit flight and accommodation proof when applying for a retirement visa in Thailand?

Make life easy, apply for the visa BEFORE you travel and use it on entry. Why wasting time and money to travel and buy a visa afterwards?

I think what people don't understand is that it doesn't matter what you're INTENDING to do once you get here, apply for retirement, marry a thai, go to school, it's WHAT way are you ENTERING thailand ?

If you're comin' in visa exempt <- free stamp entry, your air carrier can require you to have proof of onward travel within the number of days you'll be stamped in for (in most cases 30 days).

Now if you manage to board your flight without onward travel, in most cases passport control does NOT ask people for it stamping in free stamp entry.. The exception to that is if you have a crazy lenghty entry/stay history here milking free entries and 30 day extensions.. THEN you can be asked for onward travel <- as that's what they're going to ask for FIRST if they're thinking about denying you entry to the country.

Will you be getting the Non O Visa as retiree in your home country before you fly to Thailand?

I am flying in soon and I have been told yes even though applying for Retirement Visa once arrived otherwise they will not allow to fly in

If you are entering visa exempt, then your air carrier may require an exit flight within 30 days