The Productivity Commission has called for a 20 per cent tax rate on profits for companies with revenue of up to $1 billion.
That would represent a significant cut for all but the largest companies from the current rate, which is 25 per cent for companies with turnover under $50 million and 30 per cent for all others.
At the same time, the commission has called for a new 5 per cent tax on net cashflow rather than profits, which could see some large companies pay a higher rate but would provide immediate tax relief for smaller companies seeking to build their capital.
But 24 business lobby groups have banded together to release a joint statement saying that the Productivity Commission proposal to tax business cashflow "is an experimental change that hasn’t been tried anywhere else in the world".
"This tax increase risks putting more pressure on all Australians still struggling under cost-of-living pressures," it said.
"While some businesses may benefit under this proposal, it risks all Australian consumers and businesses paying more for the things they buy every day — groceries, fuel and other daily essentials."
In separate statements, Australian Industry Group warned "the proposals themselves suffer serious flaws and may well further distort our tax system".
"At face value the proposal has some attractions but as a whole the package fails the test of driving business investment across the economy," its CEO Innes Willox, said.
ACCI chief executive officer Andrew McKellar noted the proposal would only apply to a minority of small businesses, because most are not companies.
He also says the proposal risks creating a more complex two-tiered approach to business taxation.
“This proposal creates winners and losers and any net impact on productivity and competitiveness will be diminished as a result,” he said.
“While the idea of a net cashflow tax is worth considering, it has yet to be applied in practice and would result in a more complicated multi-layered business tax system."
Master Builders CEO Denita Wawn said they supported the proposed company tax cut, but that "further work will be required to assess the short, medium and long-term implications of pivoting to a combined company income and cashflow tax system for the building and construction industry".
Read more about the Productivity Commission proposal here: