No state will be worse off under a GST shake-up set to be announced this week, Prime Minister Malcolm Turnbull has confirmed.
The allocation changes will be unveiled by Treasurer Scott Morrison later this week, ahead of the July 28 by-elections where the coalition is hoping to win two seats off Labor.
"Our commitment is to have a GST system that is (so) fair, that it passes the pub test in Burnie and Bunbury, in Bundaberg and Bathurst and Bendigo - right across the country," Mr Turnbull told reporters in Sydney on Monday.
He said the goal was to ensure all states are treated fairly, with none to be worse off.
Attorney-General Christian Porter, whose electorate is in Perth, said he had been lobbying for a better deal for his state.
"We're working to ensure that we're going to improve WA considerably," he told reporters in Perth.
He said WA-based cabinet ministers Julie Bishop, Mathias Cormann and Michaelia Cash had also pushed for the state to get a better share of the GST carve-up.
Any changes to how the GST is distributed could affect the coalition's chances in by-elections in Tasmania, South Australia and Queensland.
But the Liberals are not standing candidates in Western Australia, which is where the push to change the GST formula has been the strongest.
