Such amount of tax under division (ii) of this subparagraph may be determined by the commissioner for counties which levied such tax in 2012, and in any counties which subsequently levy a tax pursuant to a metropolitan area system of public transportation, as authorized by the amendment to the Constitution set out at Ga. L. 1964, p. 1008, the governing body of the transportation authority created by the Metropolitan Atlanta Rapid Transit Authority Act of 1965, Ga. L. 1965, p. 2243, as amended, and the amendment to the Constitution set out at Ga. L. 1964, p. 1008, the commissioner may determine what amount of sales and use tax would have been collected in calendar year 2012, had such tax been levied. The amount of the reduction to be offset under this subparagraph with respect to division (i) of this subparagraph shall be calculated by the county governing authority by subtracting the amount of title ad valorem tax on motor vehicles collected under Chapter 5 of this title on behalf of such water and sewerage authority in the current calendar month from one-twelfth of the amount of such ad valorem tax on motor vehicles collected on behalf of such water and sewerage authority in calendar year 2012. The amount of the reduction to be offset under this subparagraph with respect to division (ii) of this subparagraph shall be calculated by the county governing authority by subtracting the amount of sales tax collected or determined to have been collected on such motor vehicles by the state revenue commissioner in the current calendar month in any such county from one-twelfth of the amount of sales and use tax collected, or determined to have been collected, on such motor vehicles, by the state revenue commissioner in calendar year 2012 in such county. In the event that the local title ad valorem tax proceeds are insufficient to offset fully such reduction in ad valorem taxes on motor vehicles or the portion of the sales and use tax described in division (ii) of this subparagraph, the tag agent shall allocate a proportionate amount of the proceeds to such water and sewerage authority and the transportation authority, as appropriate, and any remaining shortfall shall be paid from the following month's local title ad valorem tax fee proceeds. In the event that a shortfall remains, the tag agent shall continue to first allocate local title ad valorem tax fee proceeds to offset such shortfalls until the shortfall has been fully repaid;
shall be required to pay state and local title ad valorem tax fees in an amount equal to 3 percent of the fair market value of the motor vehicle.
Upon certification by the tag agent of compliance with the requirements of this paragraph, such motor vehicle shall not be subject to ad valorem tax as otherwise required under Chapter 5 of this title in the same manner as otherwise provided in paragraph (1) of subsection (b) of this Code section.
OCGA § 48-5C-1