Can I work for multiple employers in Thailand with a single work permit?

In Thailand, you cannot automatically work for multiple employers with a single work permit. If you want to take a second job, both your first and new employers must agree to add the new workplace to your existing work permit. The managing director of your current employer needs to inform the immigration department about the address of the new work location. Failure to adhere to this could result in penalties, although fines typically apply to work permit holders for working at unapproved addresses.