Members of the public service union Unison voted 97% in favour of the strike. The union claimed the council had refused to fully consult staff and negotiate over its plans to move IT work to either Capgemini or ITNet as part of an estimated £100m contract.
All IT support will be suspended indefinitely when the strike begins, apart from the Child Protection Register.
The union said the council wants to transfer 100 workers to a private IT firm to run its e-government project. "We need to convince the authority to be more transparent on the true costs of this project," said Unison Wales regional organiser Jeff Baker. "Staff would have no guarantee of their future status."
Mary Jones, the member of Swansea Council's cabinet with responsibility for the disputed project, said. "The council has not taken any decision over whether IT staff would transfer. If they did, the council would ensure that staff had enhanced protection."