Turnbull spruiks GST reforms in Perth

The message of Prime Minister Malcolm Turnbull to the party faithful in Perth on Saturday was full of guarantees when it came to the GST.

Speaking at the State Conference of the Liberal Party, Turnbull was able to say that he had fulfilled a promise he made two years before GST's long-term reform for Western Australia.

"We knew that the GST formula did not pass the pub test at Bunbury," Turnbull said.

"But our job was to persuade the Australians that he did not pass the pub test at Burnie or Bundaberg either."

An investigation by the productivity commission, three separate cabinet meetings and close work between the treasurer and the finance minister led to the reforms.

The changes of the coalition introduced GST payment benchmarks, according to the fiscal capacity of NSW or Victoria, whichever is the strongest.

"We have delivered a solution that ensures that Western Australia not only receives its fair share, but guarantees that the injustice never happens again," said Turnbull.

The speech concludes Mr. Turnbull's three-day visit to Perth, where he toured a small business at Swan's headquarters on Thursday along with deputy Steve Irons.

On Friday, he joined Attorney General Christian Porter while visiting the $ 1.02 billion NorthLink project site at Pearce headquarters.

The prime minister spent most of his time in Perth bragging about his government's solution to GST's revenue division after years of frustration over the poor income of WA's GST.

Planned changes to the tax formula would ensure that WA receives no less than 75 cents per person for every dollar of GST collected in the state.

Turnbull denied that he was spending time on both marginal seats because he was nervous about losing them in the next election.

Porter said that "of course" he had more confidence in the next elections after the announcement of GST.

The prime minister has also ruled out questions about the Liberal Party's decision not to contest the partial elections of Fremantle and Perth, which Labor won easily.

He promised that there would be a liberal candidate for each position in next year's federal elections.