Chris Hipkins is doubling down on the idea of a shake-up to the tax system. 

ANZ boss Antonia Watson says the "time has arrived" for a capital gains tax. 

Both Christopher Luxon and Finance Minister Nicola Willis rejected the call, joking that the boss of a big Australian bank just wants to take more money off Kiwis. 

The Labour leader told Ryan Bridge New Zealand's tax system's loaded against working people because we're not taxing other forms of income. 

He says salary and wage earners end up paying a disproportionate share of tax. 

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