Primary and intermediate school principals have settled their long-running pay dispute with the Education Ministry.
Educational Institute members have accepted a deal that gives them pay parity with secondary principals, the union says.
The agreement also increases pay rates for the principals of the smallest schools.
Negotiations began in April last year, but stalled several times prompting three strikes in conjunction with primary and intermediate school teachers.
As part of the dispute the principals began a six-week boycott of the Ministry of Education.
Meanwhile, secondary principals are expected to enter mediation with the Education Ministry today over their pay talks.