Trade union Unite has said it will be urging its members to reject the Government's public sector pay deal.
The union, which represents more than 100,000 workers on both sides of the Border, said it had "unanimously decided to recommend rejection" of the Lansdowne Road proposals, which were negotiated with the Government at the end of May.
After a month-long consultation period with its members, the union has decided the proposals are "completely insufficient to compensate our members for the losses suffered since 2009".
Unite regional co-ordinating officer Richie Browne said the public sector workers who provided the service "on which we all rely have paid for a crisis not of their making".
He added: "They have endured pay cuts, the pension levy, increased taxes and charges, job losses, cuts in sick pay and longer hours, as well as the increased pressures associated with the public sector recruitment moratorium."
The ballot will begin on Monday and finish in September.