California Code, Business and Professions Code - BPC § 9884.8

All work done by an automotive repair dealer, including all warranty work, shall be recorded on an invoice and shall describe all service work done and parts supplied. Service work and parts shall be listed separately on the invoice, which shall also state separately the subtotal prices for service work and for parts, not including sales tax, and shall state separately the sales tax, if any, applicable to each. If any used, rebuilt, or reconditioned parts are supplied, the invoice shall clearly state that fact. If a part of a component system is composed of new and used, rebuilt or reconditioned parts, that invoice shall clearly state that fact.The invoice shall include a statement indicating whether any crash parts are original equipment manufacturer crash parts or nonoriginal equipment manufacturer aftermarket crash parts. One copy of the invoice shall be given to the customer and one copy shall be retained by the automotive repair dealer.