Ga. Const. art. VII, § 2A, para. 1

For each taxable year, a homeowner’s incentive adjustment may be applied to the return of each taxpayer claiming such state-wide homestead exemption as may be specified by general law. The amount of such adjustment may provide a taxpayer with a benefit equivalent to a homestead exemption of up to $18,000.00 of the assessed value of a taxpayer’s homestead or the taxpayer’s ad valorem property tax liability on the homestead, whichever is lower. The General Assembly may appropriate such amount each year for grants to local governments and school districts as homeowner tax relief grants. The adjustments and grants authorized by this Paragraph shall be made in such manner and shall be subject to the procedures and conditions as may be specified by general law heretofore or hereafter enacted.