Members of the Association of Secondary Teachers of Ireland trade union will vote later this month on whether to accept or reject the latest offer aimed at resolving their dispute with the Government.
The ballot is expected to begin on 23 January after ballot papers and accompanying material are distributed to schools.
The union is currently drawing up documents outlining the consequences of acceptance or rejection of the proposals.
The ballot of the union's 17,000 members is expected to conclude by 1 February.
The union is recommending that members reject the offer, which is the outcome of conciliation talks.
The deal offered to the union largely comprises terms already accepted by two other teacher unions, the Teachers' Union of Ireland and the Irish National Teachers' Organisation.
Those terms had already been rejected by the ASTI. The offer is contingent on the union agreeing to be part of the Lansdowne Road Agreement, the collective public service pay deal.