Prime Minister Malcolm Turnbull will today announce a $189 million funding boost for WA hospitals to compensate for the State’s languishing GST share as he launches a pre-Budget spending blitz aimed at shoring up support among WA voters.

Mr Turnbull, who arrives in Perth this afternoon, said the $189 million top-up payment, to be included in next month’s Federal Budget, would take this year’s GST share for the State from 47¢ in the dollar to an effective 50¢.

“I am ensuring that the people of Western Australia get their fair share,” Mr Turnbull said.

The extra money will be directed to three projects, with $158 million going to Joondalup Health Campus, $10.6 million for the Osborne Park Hospital expansion and $20.3 million for refurbishing Royal Perth Hospital.

The latest Budget top-up takes the total compensation payments made to the State over the past four years to $1.4 billion, and comes after three consecutive years of WA’s share falling below 35¢ in the dollar.

WA is on track to receive $1 billion more in GST revenue in 2018-19 than last year, after the State’s relativity payment jumped from 34¢ to 47¢.

Mr Turnbull said the Government was still looking forward to the Productivity Commission’s final report on its review of GST distribution, but the top-up payment would allow the State to “provide essential health services that Western Australians rely on”.

Camera Icon Malcolm Turnbull. Credit: Getty Images

Finance Minister Mathias Cormann, who has been negotiating the Commonwealth assistance package for WA with the State Government, said the “fully funded” investment was possible because of the Government’s Budget management.

“We are committed to ensure this investment helps Western Australia deal with some of the demand pressures identified by the WA State Government,” Senator Cormann said.

The Member for Pearce, Christian Porter, praised the Joondalup hospital funding boost, saying it was needed to address the needs of a rapidly growing population in his electorate.

“It is a complete game changer for everybody who lives north of Joondalup,” Mr Porter said.

Human Services Minister Michael Keenan, whose northern Perth seat of Stirling will also benefit, said the coalition would goahead with the Productivity Commission review of the GST.

Opposition Leader Bill Shorten announced $154 million for the Joondalup expansion this month as part of Labor’s $1.6 billion Fair Share for WA fund.

WA Health Minister Roger Cook welcomed the Federal Government’s announcement, saying the State had “made it clear that Western Australia deserves its fair share from Canberra”.

“The funding boost is a recognition that WA hasn’t been getting its fair share,” he said.

Today’s commitment will fund 90 new public beds and 75 new mental health beds at Joondalup Health Campus, a new stroke unit, three new cardiac catheter laboratories, a new 25-bed coronary care unit, and expand the high-dependency unit, an urgent-care clinic, an ambulatory care centre and a medihotel.

Money for the Osborne Park Hospital expansion will be used for a neonatal facility upgrade and rehabilitation beds.

Royal Perth Hospital money will go towards a mental health observation unit and medihotel.