Education minister Simon Birmingham has conceded some private schools are "over-funded" amid fiery negotiations with states on a new four-year model for school funding.

However, he says he won't produce a "hit-list" to name them.

On the ABC's Q&A on Monday night, Mr Birmingham was grilled by host Tony Jones after an audience question about allocating "generous" amounts of money to wealthy schools.

An analysis obtained by Fairfax Media last week revealed NSW would lose $100 million if funding plans by the Federal government go ahead, with the bulk of this money coming from public schools.