A business is exempt from the assessments provided for in this

chapter if any of the following apply: (

a) The business is a travel agency or tour operator that derives less than percent of its gross revenue annually from travel and tourism occurring within the state. A travel agency or tour operator that qualifies for this exemption may participate as an assessed business by paying an assessment calculated on the same basis applicable to other travel agencies or tour operators, respectively, and by filing a written request with the director indicating its desire to be categorized as an assessed business. (

b) The business is a small business. For purposes of this section, “small business” means a business location with less than one million dollars ($1,000,000) in total California gross annual revenue from all sources. This threshold amount may be lowered, but never to less than five hundred thousand dollars ($500,000), by means of a referendum conducted pursuant to

Section 13995.60; however, the director may elect to forgo assessing a business for which the expense incurred in collecting the assessment is not commensurate with the assessment that would be collected. (

c) The assessments provided for in this

chapter shall not apply to the revenue of regular route intrastate and interstate bus service: provided, however, that this subdivision shall not be deemed to exclude any revenue derived from bus service that is of a type that requires authority, whether in the form of a certificate of public convenience and necessity, or a permit, to operate as a charter-party carrier of passengers pursuant to

Chapter 8 (commencing with

Section 5351) of Division of the Public Utilities Code. (

d) Any business exempted pursuant to this

section may enter into a contract for voluntary assessments pursuant to

Section 13995.49.