How soon can I apply for my annual retirement visa extension before the due date in Thailand?

Yes, i changed reason for extension (OA to marriage) So now I understand. Thanks for clearing this out.

@Ronny ******

does your passport expire on Oct 2023? Did you change the reason for your extension (from marriage to retirement, from retirement to marriage, from marriage to raising thai kids)? Changing the reason for an extension means the new one starts the date you apply and it's not added on

Yearly extensions for the same reason are added to the expiration date when you apply. My expiration date is Apr 5, and has been since I got the Non-O visa issued. Last year even though I applied 42 days early last year (Feb 22) my extension still expires on Apr 5th

@Graham *****

for 30 day extensions on visa exempt entries and tourist visa entries yes, but I actually think you can get a new extension on a retirement or marriage extension when you have 45 days or less left on your stamp. I said 30 or less just to be safe 😛