Hi,
I have a 60 day tourist visa and would like to go for the 30 day extension at the local Thai immagration office. Does the extension add onto my existing visa or from the day I get it stamped? As I have 35 days left in my current visa
TLDR : Answer Summary
The 30-day extension on a Thai tourist visa is added to the end of your existing visa. The new period starts immediately after the original visa finishes, meaning you effectively receive a total of 90 days if you apply for the extension when you have 30 days or less remaining on your current visa.