Utah Code Ann. § 59-12-1201
(1)
(2)
(b)
(i) For a transaction subject to a tax under Subsection (1), a tax rate increase shall take effect on the first day of the first billing period:
(ii) For a transaction subject to a tax under Subsection (1), the repeal of a tax or a tax rate decrease shall take effect on the first day of the last billing period:
(3) A motor vehicle is exempt from the tax imposed under Subsection (1) if:
(4)
(a)
(i) The tax authorized under this section shall be administered, collected, and enforced in accordance with: