Julia Gillard and Tony Abbott are on rare common ground with both leaders ruling out any extension of the GST.
But on raising the retirement age there is less consensus between the prime minister and opposition leader.
Both ideas are contained in a report, to be released on Friday by think tank the Grattan Institute, which says reforming the tax mix to shift more towards consumption tax and increasing the number of women and older people in the workforce would be the biggest boons to the economy.
It advocates removing the GST exemption on education, health and fresh food - a measure that would raise $20 billion of revenue a year.
That revenue could fund a cut in the company tax from 30 per cent to 23 per cent, reduced income taxes and higher welfare payments.
Both Ms Gillard and Mr Abbott ruled out any changes to the GST, giving identical answers on Friday: "No I don't."
Ms Gillard went further saying: "I don't support lifting the rate of the GST (from 10 per cent)."
The report also says increasing the pension age to 70, from the current 65 for men and 64 for women, and raising the age at which people can access superannuation would lift the workforce participation rate by 1.3 per cent.
Ms Gillard said the government already had made the decision to lift the retirement age to 67 by 2023.
"We are not revisiting those decisions," she told reporters in Melbourne.
Mr Abbott was more open to the suggestion.
"I'm not saying it's wrong," he told the Nine Network.
"But I don't think there should be any further lifting of the retirement age without a full community debate and I'm certainly not proposing that."