The Greens have targeted the big banks, big miners and big polluters in a response to the National Commission of Audit that they say would raise almost $80 billion without hurting ordinary Australians.

Vowing to oppose all budget measures that would increase health costs or reduce welfare, the Greens have proposed a swath of measures including a "millionaire's tax" that would require top income earners to pay half of all earnings over $1 million in tax.

Dismissing the commission's 86 recommendations as a radical agenda that would completely reshape the relationship between citizens and the government, the Greens propose: