225 ILCS 90/16
Any physical therapist or physical therapist assistant who notifies the Department in writing on forms prescribed by the Department, may elect to place his or her license on an inactive status and shall, subject to rules of the Department, be excused from payment of renewal fees until he or she notifies the Department in writing of his or her desire to resume active status.
Any physical therapist or physical therapist assistant requesting restoration from inactive status shall be required to pay the current renewal fee and shall be required to restore his or her license, as provided in Section 15 of this Act.
Any physical therapist or physical therapist assistant whose license is in an inactive status shall not practice physical therapy in the State of Illinois and that practice shall be deemed unlicensed practice.
225 ILCS 90/16