I'll change my mind to get it right:Hanson

Colin Brinsden, AAP Economics Correspondent
Mathias Cormann intends to have the Senate vote on the government's 10-year tax plan this week

Finance Minister Mathias Cormann hasn't given up trying to persuade Pauline Hanson to back the Turnbull government's 10-year business tax plan.

Senator Hanson confirmed she had talks with Senator Cormann on Tuesday as he tried to get her over the line in supporting a cut in the corporate tax rate from 30 per cent to 25 per cent for all businesses.

But in one breath in Wednesday's interview on the Nine Network, she said she was "adamant" in not supporting the package and in the next she seemed to leave the door open.

Labor has accused the One Nation leader of being a "flip-flopper" after she reneged on a previous agreement with Senator Cormann to back the deal and after she also ended up supporting the government's personal income tax cuts when she previously said she wouldn't.

"That is my prerogative and I will change my mind as many times as I want to ensure that I come up with the right decision," Senator Hanson said.

But even if Senator Cormann, the government's chief negotiator in the upper house, can get One Nation's two votes in the Senate, it would still leave the government two short of the eight crossbenchers needed to pass the legislation, a position it found itself in before Easter.

The two Centre Alliance senators haven't budged in months in their opposition to the tax plan, neither has independent Tim Storer.

Senator Cormann also ruled out a compromise deal that would limit reductions to businesses with a turnover of up to $500 million, as backed by independent Derryn Hinch, because he would then lose the support of fellow crossbencher David Leyonhjelm.

Senator Hinch is sticking to his guns.

"I haven't changed. I don't intend to," he told ABC TV.

But Senator Cormann says the government remains committed to securing its passage this week and before parliament rises for the winter break.

Meanwhile, Opposition Leader Bill Shorten is under government pressure to reveal Labor's position on legislated tax cuts for companies with annual turnovers between $2 million and $10 million.

"Tell us today, end the mystery," Treasurer Scott Morrison demanded on Sky News, a day after Mr Shorten announced a Labor government would repeal a cut in the corporate tax rate that applies from July 1 for companies with turnovers between $10 million and $50 million.

Business groups were angered by the decision, more so because Labor has yet to make up its mind on firms with a turnover of $2 million and $10 million.