In the Gonski report released in February, the independently appointed David Gonski recommended the federal government inject $5 billion into the education system to create better equality between state, independent and Catholic schools.

Of that figure, $1.5 billion is to come from the Commonwealth and $3.5 billion from the states.

Union president Terry Polglase said that according to his figures, based on the state's population, which is 2 per cent of the nation, the state government would need to contribute a further $70 million annually into the education system.

''The best thing all political parties could do is address this before the next election,'' Mr Polglase said.

''Nationally, this is what we'll be pushing for and they should really consider this as being their major item.''

He said the inequity between the public, Catholic and independent systems would only grow if nothing was done to stop the widening gap.

Mr Polglase said that because public schools were open to everyone, they took the majority of students needing higher educational needs, such as those with disabilities (80 per cent), those from low-income families (77 per cent) and indigenous children (86 per cent).

He said if public school closure assessments were carried out on some of the Commonwealth-funded private schools many would close because of small enrolment numbers but they continued to operate and get funding.

Education Minister Nick McKim would not be drawn on the amount of $70 million.

He said there were ongoing discussions and meetings at a national level between federal and state ministers but nothing on the report had been decided yet.

''We are still investigating the implications of the report to Tasmania,'' Mr McKim said.