O.C.G.A. § 25-5-13: Service of notice of request for collective bargaining upon corporate authorities by bargaining agent.

Whenever wages, rates of pay, or any other matter requiring appropriation of money by any municipality are included as a matter of collective bargaining conducted under this chapter, it is the obligation of the bargaining agent to serve written notice of a request for collective bargaining on the corporate authorities at least 120 days before the last day on which money can be appropriated by the municipality to cover the contract period which is the subject of the collective bargaining procedure.