I have a work permit but my passport is expiring next year. So, I plan to renew my passport from my home country as I will be going there in a few months.
I wanted to understand that when I come back to Thailand, do I just need to hand them over both my new and old passport(with the relevant stamps) or is something else also needed?
TLDR : Answer Summary
When returning to Thailand with a new passport after renewing it, you need to present both your old and new passports at immigration. The old passport should have the relevant stamps. Additionally, upon your return, it's necessary to visit the immigration office that issued your work extension and complete a form titled "TRANSFER STAMP TO NEW PASSPORT" to move your visa to the new passport.