O.C.G.A. § 48-5-360 (2019)

(a) When any finance officer or other person authorized to collect the taxes due any municipality can find no property of the defendant on which to levy a tax execution, he shall make an entry to that effect on the execution and may then issue summons of garnishment without making affidavit or giving bond against any person who he believes is indebted to the defendant or who he believes has property, money, or effects of the defendant in his hands. The summons of garnishment shall be served by the finance officer, other tax collector, sheriff, or any constable of the county in which the garnishee resides at least 15 days before the sitting of the superior court or city court of the county in which the municipality is located and shall be returned to such appropriate court.

(b) The finance officer or other person authorized to collect taxes shall enter on the execution the name of the person garnished and shall return the execution to the court. The subsequent proceedings on the garnishment shall be the same as on garnishments in cases when judgment has been obtained.