JULIA Gillard has pledged that "no school will lose a dollar" under her funding shake-up despite research finding 3000 public and private schools could emerge as losers.

News Limited today publishes the full list of schools to emerge as losers based on data provided by the Department of Education to schools and state governments.

Secret modelling prepared by the states and non-government schools suggests up to a third of schools could be worse off under the Gonski plan.

While there are 6000 schools to emerge as winners under the funding carve up, the surprise finding of the modelling is that struggling public and Catholic schools are among the 3254 potential losers.

In Victoria, the modelling suggests public and private schools could emerge as losers.

Secret modelling on the schools that stand to lose

In response, the Prime Minister has revealed for the first time that the Government was advised months ago that some schools could miss out unless major changes were made.

"While the original modelling from the panel had some schools missing out, there was no way we were going to let that happen," Ms Gillard said yesterday.

"So we've taken action to make sure no school will lose a dollar - and, in fact, every school's funding will continue to rise.

"Every parent, every principal, every child can rest assured that their school won't lose a dollar.

"In a few weeks we'll be announcing exactly how we will achieve that."

The Government has never released the modelling provided to the panel, led by businessman David Gonski, to revamp schools funding and Ms Gillard declined to do so yesterday.

She is expected to announce a delayed transition to a new funding model for public and private schools as the Government grapples with difficulties of delivering a policy with no losers.

But she is expected to announce up to $3 billion in new funding a year - twice the figure originally recommended - as her Government attempts to shame the states into pumping more money into public schools.

Catholic Education office executive director Stephen Elder said schools had not released their modelling to date because negotiations with the Government were continuing.

"There's a large number of Catholic schools that could be worse off as it stands," Mr Elder said.

"The worst hit states are Victoria, NSW, the ACT and WA, but other states are also affected.

"I want to be fair to the Government. The reason they are taking so long is they are working to resolve the problem. What the solution is, I don't know."

Opposition education spokesman Chris Pyne said the Government had "serious questions to answer".

"With 3254 schools, including 2330 government schools, set to lose on average $500,000 a year in funding, the Gillard Government is going to have find an additional $1.42 billion a year to keep these schools open," Mr Pyne said.

"If this funding isn't found, it will hit the pockets of parents. Without a clear and transparent account of where this money is coming from, the Gonski announcement will be a hoax, a cruel hoax."

The funding formula proposed by the Gonski review would deliver a baseline funding of $8000 for every primary school student and $10,500 for high school students with new loadings for disability, location and disadvantage.

Independent Schools Council of Australia spokesman Bill Daniels called on the PM to release the Commonwealth's modelling to clarify the situation. Mr Daniels warned private school fees could rise if the she failed to act.

"The Government is well aware of our modelling. We will hold the Government to account for its undertaking that no school will lose a dollar," he said.