Termination of schools funding under the Gonski model after four years will deliver an ''overpayment'' of $169 million a year to 163 wealthy independent schools in NSW, analysis shows.

The NSW Greens claim the Abbott government's decision to axe the final two years of the six-year funding deal struck by the Gillard government means the average public school will lose $357,000 a year by 2020.

Private schools won't suffer in the post-Gonski era. Credit:Michele Mossop

The analysis suggests schools including Loreto Kirribilli, Brigidine in St Ives and St Aloysius in Milsons Point will be paid more than $5 million a year extra after the agreement lapses in 2018.

Under the Gonski agreement, the private schools were to retain existing funding while more disadvantaged schools, independent and public, were to receive increased funding on a needs basis.