@Brandon ****
There are a number of different "retirement" visas. The OA is a multi-entry visa with a 12-month validity. During that 12 months you can leave and enter as many times as you like (hence the multi-entry label). You do NOT need a re-entry permit for any entries within the 12 month validity. You carry out a border bounce when you are a few days off the expiry date of the visa, and upon re-entry you are stamped in for a further 12 months. Your visa has now expired, but you can remain in Thailand up until the expiry date of the entry stamp. During this period you are also free to leave and re-enter as many times as you like. HOWEVER, during this "second year" you WILL need a re-entry permit each time you enter. You can get a multi entry permit which will be dated up until the expiry of your entry stamp. A single re-entry permit will cost 1000 baht, a multi-entry is 3800 baht, so you calculate how many times you will be leaving/re-entering during that 12 month period to calculate your best value for money