The Australian Greens want to cut corporate tax rates harder and faster than the coalition - but only for small businesses.
Opposition Leader Tony Abbott has confirmed a coalition government would lower the 30 per cent tax rate to 28.5 per cent from July 1, 2015 for all businesses.
Greens leader Christine Milne parried with a promise to cut the rate to 28 per cent but only for businesses with an annual turnover under $2 million.
"This is the kind of injection that small business has really been looking for," she told reporters in Canberra.
"Not only is it more generous to small business, it would start a year earlier."
The Greens plan would benefit 610,000 small business and cost $1.75 billion over four years, compared with $5 billion for the coalition cut.
Mr Abbott has said the company tax cut would offset his plan for a 1.5 per cent levy on big business to pay for his wage-replacement paid parental leave scheme.
The Greens also want to put a levy on big business to cover a similar leave proposal.
However, Senator Milne said big business could afford to pay more tax and didn't need any offset.
