A minor is required to obtain a work permit for each job they hold. A work permit becomes invalid, or expires, when a minor quits or leaves a job. Consequently, a new work permit application must be completed for each new job.
In California, all work permits expire five days after the opening of school in the fall. This policy ensures that all minors return to school before resuming work after summer vacation. For example, if a minor obtained a job and a work permit in June and continued in that same job in September, the work permit would still expire in September. The minor would need to obtain a new work permit for the new school year, even though it is for the same job they held previously.