Hi.
Im getting mixed answers to this question from my local enquiries hope you can clear up my confusion please.
My current Thailand 30 day visa on arrival (exempt) will expire on 29th Jan. If i go to immigration office now (14/15th), will the new 30 day visa run on from existing visa/entry permit expiry or only 30 days from 14/15th?
TLDR : Answer Summary
If you visit the immigration office now, your extension of stay will be added to the end of your existing 30-day visa exempt entry. This means that if you apply for the extension before your current visa expires, you will receive an additional 30 days starting from the expiry date of your current visa (29th Jan), resulting in a new expiry date of 28th Feb.