It said it would seek equal pay for Education Support Workers, a female dominated profession which are employed by the Ministry of Education to give education support for students with special needs, largely in early childhood.
In 2008, a study found there were around 600 support workers, whose jobs were roughly equivalent to prison officers in skills, responsibilities, and emotional and physical demands. Yet the support workers' top hourly pay was only $19.29 compared with $32.07 for a senior corrections officer.
NZEI said the study, but the Pay Equity Commission, had been sidelined by the government.
"The Government has been ignoring this human rights issue for far too long and we will now pursue our case through the courts," said NZEI National Secretary Paul Goulter.
He said some of the education support workers employed by the Ministry of Education were paid as much as $8 an hour less.
"There has been no real movement, and in fact what we're seeing across the workforce in New Zealand is growing inequity and female dominated workforces have suffered the most."
"We have given the Government plenty of time to tackle this issue and we will now also follow in the path of the midwives and the case of Kristine Bartlett and seek redress through the legal system."