The Federal Government has seized on Tasmania's agreement to the so-called Gonski school funding plan to issue a call for other states and territories to sign on.

Tasmania has secured more than $380 million in extra funding for its state schools under the Government's Better Schools Plan.

The state had been seeking assurances the new money would not affect its share of the GST.

At a media conference this afternoon, Premier Lara Giddings said the state was now satisfied it would not.

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"We did face the prospect without those assurances that we could gain $50 million from the Commonwealth in a year, but lose over $100 million through the GST redistribution," she said.

Tasmania is the fourth jurisdiction to sign up to the National Education Reform Agreement following New South Wales, South Australia and the ACT.

It is also the final Labor state to agree, leaving the Rudd government with the more challenging job of negotiating with the conservative governments of Queensland, Victoria, Western Australia and the Northern Territory.

The Federal Government has extended the June 30 deadline set by previous prime minister Julia Gillard to this Sunday, July 14.

But Education Minister Bill Shorten says he is not willing to push the deadline out further.

"I'm not prepared to give up," he said. "I'm not prepared to accept that it's too hard for people of goodwill to prioritise our kids ahead of politics.

"I don't think July 14 is an un-doable date in terms of us achieving agreement by then."

Tasmania's funding to rise to $1.4 billion

Under the deal, total school funding in Tasmania will rise to $1.4 billion in 2019.

The national funding plan, spearheaded by businessman David Gonski, passed Federal Parliament last month.

The $15.2-billion package was announced in April with 65 per cent of the money coming from federal coffers and the rest to come from the states and territories.

It will draw $9.4 billion from the federal budget over six years and be indexed at a higher rate of 4.7 per cent.

Under the Government's model, the funding is allocated differently across the states and territories.

Each jurisdiction has been asked to maintain current school spending and commit to 3 per cent growth in school funding every year.

Negotiations are also continuing with the non-government school sector.

Queensland's Education Minister, John-Paul Langbroek, says he spoke to Mr Shorten today but that they did not discuss any substantial policy matters.

He says the Gonski reforms still do not add up for Queensland.