Concerns the National Party's tax plans could cause more harm than good.

Leader Chris Luxon's announced in his first State of the Nation speech that he'll reverse every tax increase the current Government has imposed if he becomes Prime Minister.

He also wants to adjust all tax bracket thresholds, so people pay less tax.

Council of Trade Unions Chief Economist Craig Renney told Kate Hawkesby that's not going to fix the country's problems.

“Property speculators is not going to reduce the price of fuel, reducing taxation on multiple landlords is not going to reduce international shipping costs.”

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