When I apply for a tourist visa extension, if it's approved, does the new visa start on the expiration date or the date of the application?
TLDR : Answer Summary
When applying for a tourist visa extension in Thailand, if approved, the new extension will start on the expiration date of your current visa stamp, not the date of the application. Extensions typically add 30 days to your existing visa, and you can apply for the extension between 7 to 45 days before your current visa expires.