Labor could get the details it wants about the 10-year income tax cuts after a Liberal senator signalled negotiations are ongoing to get them over the line.
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The federal opposition supports the reduction of up to $530 a year under a new low and middle-income tax offset and the lifting of the 32.5 per cent tax bracket from $87,000 to $90,000, both starting on July 1.
But Labor wants more information on the tax cuts planned for 2022 and has "grave reservations" about the reduction in 2024.
"My understanding is if we can negotiate with Labor to get this over the line that would be ideal," new Liberal senator Amanda Stoker told reporters in Canberra on Wednesday.
"If it means they need more information to do that, I believe that's being organised.
"That's my understanding, that there's no secrets behind the budget, it's all been costed in the usual way and all of that's available to Labor just as to everyone else."
Labor said it had not yet had a response to its questions about the tax plans.
One Nation does not support the personal income tax cut in 2024 either, saying Australians need their tax cuts now.
The Greens won't support any income tax cuts or Labor's compromise and instead want the money invested in the nation's public services.
Shadow treasurer Chris Bowen also played down suggestions the government's corporate tax cuts are dead, despite crossbench senators withdrawing support.
Pauline Hanson withdrew her One Nation senate team's support on Tuesday, throwing the government's plans for a company tax cut into chaos.
But Mr Bowen said the Senate was a "mysterious beast" and Labor would continue to fight against the company tax cuts until the coalition took them out of the budget.
Australian Associated Press