Education Minister Chris Hipkins says the pay offer put to teachers and principals this week was "the final deal" - apparently quashing school principals' hopes that they might get more.
Primary school principals have voted to reject the deal they were offered, even though primary teachers have accepted their deal.
The deal would have lifted principals' pay rates by between 9 and 14 per cent, proportionately less than an 18.5 per cent pay hike for ordinary teachers at the top of the basic scale.
Some principals have said the deal would give their deputy principals higher pay packages than the principals themselves.
NZ Educational Institute president Lynda Stuart said the deal also did not give them pay parity with secondary school principals, who are only in the early stages of their pay negotiations.