Hey guys, I don't know anything about this, so: what if you have a work permit and you quit your job? Do you have to leave the country immediately? Will it become invalid?
TLDR : Answer Summary
When you quit your job in Thailand, your work permit does not automatically allow you to stay in the country. If you're on a Non-B visa secured from a Thai consulate, or an extension of stay from a Thai immigration office, the process involves going to the Ministry of Labour to cancel your work permit, followed by the immigration office to cancel your extension of stay. After canceling, you must either leave the country that same day or purchase a 7-day extension for 1900 baht to give you time to exit.