Veh. Code, § 11508

(a) Every occupational license and special plate issued under this chapter shall be valid for a period of one year from midnight of the last day of the month of issuance. Renewal of the occupational license and special plates for the ensuing year may be obtained by the person to whom any plates and license were issued upon application to the department and payment of the fee provided in this code.

(b) Except as provided in subdivision (c), every application for the renewal of an occupational license and special plates which expire pursuant to this section shall be made by the person to whom issued not more than 90 days prior to the expiration date, and shall be made by presenting the completed application form provided by the department and by payment of the full annual renewal fee for the occupational license and special plates.

(c) If the application for renewal of the occupational license and special plates is not made by midnight of the expiration date, the application may be made within 30 days following expiration of the license by paying the annual renewal fee and a penalty fee equal to the amount of the original application fee for each occupational license held. A penalty as specified in Sections 9553 and 9554 shall also be added to each special plate renewed during the 30-day period following expiration of the special plates.

(d) In no event may the licensee renew the occupational license or special plates after the expiration of the 30-day period authorized in subdivision (c).