(a) A person required to register under § 152.065, Tax Code, may include in a customer agreement subject to Subsection (b) a separate charge for the proportionate amount of title fees, registration fees, and property taxes paid in the preceding calendar year on the person’s vehicle fleet.
(b) A person who includes the charge must do so:
(1) on a nondiscriminatory basis; and
(2) in each agreement other than an agreement that is exempt from the tax imposed under § 152.026, Tax Code.