The Green Party's eyeing sweeping changes to our tax system... but not all financial experts are onboard.

It's promising a 2.5% wealth tax, targeting assets worth two-million-dollars, or four-million for couples.

The party would remove taxes for earners below 120-thousand-dollars, while lifting the top tax rate to 45%, and corporate taxes to 33%.

Oliver Shaw Tax Advisory Director, Mike Shaw told Mike Hosking that he's not a fan of the tax-free threshold.

He says it results in steeper tax rates above the threshold, making people pay more and incentivising people not to work.

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