Each registration which has been approved expires on December 31st of the second year after it was approved and may be renewed for two years by payment of a renewal fee of ten dollars ($10). The renewal shall be made on forms which are supplied by the director.
Source:
Section 38943.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=FAC§ionNum=38943.5..