Students: Permits expire every semester.
Employee (payroll deduction): If purchased through payroll deduction, your permit is on automatic renewal as long as you have a paycheck deduction or until you cancel your permit
Employee: Annual permits purchased through credit card end in August.  Semester-based permits expire at the end of the semester.
Affiliates: Annual permits end in August.  Semester-based permits expired at the end of the semester.
It is highly recommended that you log onto your parking portal and confirm your expiration date on your permit.