The Labour party says it will put an end to 'voluntary' school donations for most parents if it wins the election.
The party's plan is to give schools an extra $150 per pupil in place of donations to help fund school operations.
The estimated cost is $70 million a year, and schools that accept the payment won't be able to ask parents for general purpose donations.
They will still be able to ask for donations for extra-curricular activities like school camps.
"We expect the parents of more than 450,000 students will no longer be asked to pay a donation," Labour leader Andrew Little said on Friday.
"Labour has always been committed to a world-class free education that's accessible to everyone, and today we're reaffirming that commitment."
The party's alternative budget, released on Wednesday, puts an extra $4 billion into education over four years.
Mr Little and education spokesman Chris Hipkins will release the full manifesto on Friday afternoon.
"This will be the long-awaited shot in the arm much of the sector has been waiting for," Mr Little said.
"National has chosen nine years of cost-cutting measures over quality, creating burnt out teachers, a narrow curriculum and falling tertiary education participation."
Mr Little says $1.7m of the $4m will go towards increasing funding across "critical areas" and deliver more teachers, better professional development and more learning resources."