Prime Minister Malcolm Turnbull insists his government has done more than any other to tackle multinational tax avoidance, as he tries to woo two crucial One Nation senate votes for his business tax cuts.
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The second part of the government's tax plan takes centre stage in parliament this week ahead of the long winter break and crucial "Super Saturday" by-elections being held on July 28.
Last week, it's seven-personal income tax package was successfully steered through the government.
The government now wants the upper house to approve the whole of its 10-year plan to reduce the corporate tax rate to 25 per cent.
"The reason for that is because we don't want to short-change the Australian people. We don't want to short-change them on their jobs. We don't want to short-change them on their prosperity," Treasurer Scott Morrison told reporters in Canberra on Monday.
So far the government has managed only to secure a reduction for businesses with a turnover of up to $50 million.
One Nation leader Pauline Hanson wants a government crackdown on multinational companies avoiding their tax obligations and an end to tax deductions for firms using overseas call centres.
"I have said all along that the government has not given me any assurance that they intend to go after multinationals to get them to pay their taxes in this country," Senator Hanson told Seven Network.
But Mr Turnbull says the government is committed to everyone paying their fair share of tax.
"We've been relentless on this," he told reporters in Canberra.
With Labor and the Greens adamant they won't support the business cuts, the government needs eight of the 10 crossbench senators on board.
Without the votes of the One Nation senators, the legislation could be doomed. Not so, says Deputy Prime Minister Michael McCormack.
"That's the policy we're taking to the next election," he told ABC radio.
The government fell short of two votes when it tried to get the remainder of the tax plan passed just before Easter.
Since then Senator Hanson reneged on a previous deal with the government to support the cuts.
Independent senator Tim Storer has repeatedly said he doesn't support the cuts either and fellow crossbencher Derryn Hinch has previously said he would only support a cut for businesses with a turnover of up to $500 million.
Australian Associated Press
