It's being suggested that reforms to Tomorrow's Schools could produce a big bill for the Government

The 100-strong Waitakere Area Principals' Association claims the shake-up to the education system will cost up to an extra two billion dollars a year.

It says that relates to the setting up of education hubs, the addition of learning support co-ordinators, and boosting management numbers at primary schools to be in line with secondary schools.

Laingholm School principal Martyn Weatherill, who wrote the submission based on assumptions and government statistics, wants to know where the money is coming from.

He says teachers have been told there's no money to pay them more, but this exercise will be extremely costly.