The three unions, the Irish National Teachers' Organisation (INTO), the Association of Secondary Teachers Ireland (ASTI) and the Teachers' Union of Ireland (TUI), are forming a united front to take on the Government on the issue.
A common, strongly-worded motion has been agreed by the union leaderships, which calls for negotiations on pay inequality to begin by the end of April and to conclude by early May.
The new motion updates earlier and separate motions decided individually by the unions ahead of the conferences, and puts them all on exactly the same footing.
By early May, the unions want an agreement that has "the capacity to achieve a resolution of all aspects of pay inequality" - that would involve a commitment by the Government to end pay inequality.
Failing that, ballots for industrial action, up to an including strike, will go ahead
Delegates at both the INTO and the ASTI conferences will debate the motion today with an expectation that it will be passed. It is also expected to be debated by the TUI at its conference today.
INTO president John Boyle said yesterday that the patience of the teacher unions was "definitely running very, very thin in relation to seven or eight years of dastardly cuts to the young teachers".
Mr Boyle confirmed that at if pay equality has not been negotiated by the start of the next school year, they would be "shutting down schools and withdrawing labour".