Utah Code Ann. § 59-12-204
(2)
(a) The tax ordinance under Subsection (1) shall include a provision imposing a tax upon every transaction listed in Subsection 59-12-103(1) made within a county, including areas contained within the cities and towns located in the county:
(6) Such tax ordinance shall include a provision that any person subject to the provisions of a city or town sales and use tax shall be exempt from the county sales and use tax if the city or town sales and use tax is levied under an ordinance including provisions in substance as follows:
(7) Notwithstanding any other provision of this section, beginning July 1, 2000, the commission shall:
(a) determine and retain the portion of sales and use tax imposed under this section:
(8)
(c) For a city, town, or unincorporated area of a county that imposes a tax under this part, the commission shall retain each month an amount equal to the product of: