The Alien Employment Act 1978 stipulates four types of aliens who can apply for
work permits in Thailand:
1. Aliens having residence in Thailand, and aliens with a temporary permit to stay
in Thailand who are not tourist or not on transit. The duration of work permit is
normally not more than one year.
2. Aliens who have permit to come to Thailand under the Investment Promotion
Law or other similar promotion acts (e.g. Petroleum Act, Industrial Estate Act).
The length of the work permit follows the duration of stay allowed by the related
host agency.