California Code, Revenue and Taxation Code - RTC § 994

(a) Steel-wheeled and track-laying equipment shall not be subject to the license fees imposed pursuant to Part 5 (commencing with Section 10701) of Division 2 of this code, but shall be assessed in the county where it has situs on the lien date.

(b) Rubber-tired equipment, except commercial vehicles and cranes registered under the Vehicle Code and which are licensed under Part 5 (commencing with Section 10701) of Division 2 of this code, which must be moved or operated under permit issued pursuant to Section 35780 of the Vehicle Code, shall be assessed in the county where it has situs on the lien date, but the assessee of such property shall be allowed to deduct from the amount of property tax the amount of any fee paid on such vehicle under Part 5 (commencing with Section 10701) of Division 2 of this code, if such fee is paid prior to the lien date for the calendar year in which the lien date occurs.

(c) Rubber-tired cranes and commercial vehicles which must be moved or operated under permit issued pursuant to Section 35780 of the Vehicle Code, and rubber-tired equipment that does not require a permit, which cranes, vehicles, and equipment are registered under the Vehicle Code and licensed under Part 5 (commencing with Section 10701) of Division 2 of this code, shall not be otherwise assessed for purposes of property taxation.