Labour says student learning will suffer and parents will be asked to fork out more money due to the government "underfunding" schools.
The party's education spokesman Chris Hipkins made the comments following a Herald on Sunday article that exposed how financially-strapped secondary schools are cutting back on classroom activities, field trips, science experiments and even removing courses after a crackdown on parent donation rules.
School are no longer able to ask parents for money for activities considered part of the national curriculum. A New Zealand Secondary Principals' Council survey into the guidelines set by the Ministry of Education in 2013 revealed that two-thirds of schools reported a reduction in school finances.
Mr Hipkins, who also challenged Education Minister Hekia Parata over school funding in Parliament this morning, said that situation was due to get worse.
He said education was underfunded by $40 million.