The Green Party have unveiled their wide-ranging tax and income policy ahead of October's election.

To keep low-income Kiwis above the breadline, the Greens proposed a top tax rate of 45 percent on income over $180,000 and a 2.5 percent wealth tax on assets worth more than $2 million.

ZB's senior political correspondent Barry Soper says Labour and the Greens will need each other this election if they get too close to the centre-right.

"Bottom lines, if Chris Hipkins now comes out and says- we're not going to have a wealth tax, where does that leave the Greens?"

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• Greens co-leader: Wealth tax will only capture 0.7 percent of people
• James Shaw says Green's tax plan is likely to have greater levels of support
• Wealth tax hikes will pay for income tax cuts and welfare overhaul- Greens