What happens if an applicant allows their license to expire?

Allowing a license to expire means that it is no longer in effect and the individual can no longer legally practice as a PT/A. The only way for the individual to resume their work as a PT/A is by submitting a reinstatement application. Retaking the initial licensing examination is not necessary, and there is no automatic fine for an expired license. Keep in mind that every state has its own rules and regulations regarding expired licenses, so it is important to check with your state's licensing board for specific requirements.