Georgia Code Title 48. Revenue and Taxation § 48-5-352

(a) The provisions of any municipal charter to the contrary notwithstanding, in determining the fair market value of property within their respective tax jurisdictions for purposes of ad valorem property taxation, municipalities shall use the fair market value finally determined for the property for county ad valorem property taxation purposes. Fair market value shall be finally determined for county ad valorem property taxation purposes when all means for administrative and judicial review of the fair market value have been exhausted or are no longer available.

(b) As soon as the fair market value of property within a county is finally determined, such information shall be furnished without charge by the county to the governing authority of each municipality lying wholly or partially within the county.