Passport going to expire early next year.. 1 yr Extension of stay ends mid Aug. Planning on returning to home country (canada) in April along with getting a re-entry stamp, and then apply for new passport while in home country. Questiion/guidance: Once i get my new passport, will the previous extension to stay/re-entry permit still be valid when I re-enter the country at the bkk airiport in June ? Or is there some formal process in place that needs to occur for this transfer inorder to retain and thereafter apply for a following extension when due.
TLDR : Answer Summary
When you re-enter Thailand with a new passport after your current extension of stay ends, yes, your extension will still be valid. You need to carry both your current and new passports to show to the Thai Immigration Officers. After returning, it's necessary to visit the local Thai Immigration office to transfer your extension of stay stamp from your old passport to your new one.