Teachers who entered the profession from February 2012 have had their starting pay reduced by 21.7% compared to those appointed prior 2011, the union has stated.
General secretary of the TUI, John MacGabhann, said the situation is intolerable.
He said: ""People doing the same work, before the same students, in the same schools, for the same time, with the same range of challenges and opportunities - except that the opportunity does not extend to having equal pay."
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