Tasmania has signed on to the Federal Government’s national schools funding plan, leading to an announcement that the deal is past its tipping point and remaining states should get on board.

Federal Education Minister Bill Shorten says now with 63 per cent of the nation’s students covered by the reforms, Coalition states should stop holding out; "When you have half of the state and territory jurisdictions backing [Gonski reforms]... I do not believe the conservatives should be using education... as a political football," he said.

Tasmania is the latest jurisdiction to sign the National Education Reform Agreement, the changes recommended by David Gonski will provide the state's 81,000 school students with an extra $382 million over six years.

Mr Shorten could not say what would happen if the remaining states had not signed on by the deadline this weekend. Some reports speculate they may miss out, but Shorten says, “if I start war-gaming what happens after July 14, people will start moving their horizons beyond that date."

Tasmania’s Labor Premier Lara Giddings raised concerns before signing that federal funding of about $50m a year would see the state lose $105m a year in GST revenue. Negotiations found a compromise on state Labor's insistence there should be a greater focus on disadvantaged government schools.

Representative of the Independent Schools Tasmania board said it had been assured non-government schools would get a fair deal.