Election Tax Proposals Face Scrutiny as Economic Reality Checks Set In
As New Zealand heads into next week’s general election, political parties are dangling promises of tax reform before voters, with the Green Party and Te Pāti Māori proposing significant hikes to the top personal income tax rate. While the current 39 percent rate—applicable to earnings over $180,000—is considered low by international standards, a new analysis warns that boosting that figure to 45 or 48 percent is far from a simple revenue-generating exercise.
A report published in New Zealand Economic Papers by Associate Professor Peer Ebbesen Skov and Professor Norman Gemmell highlights the “Laffer curve” effect: the economic phenomenon where taxpayer behavior shifts in response to higher taxes, potentially eroding the very revenue the government seeks to collect.
When tax rates rise, individuals often pivot. Some may engage in aggressive tax planning—such as moving income into lower-taxed family trusts—while others may choose to work less, decline promotions, or scale back investment in their careers. According to the research, if the top rate were raised from 39 percent to 45 percent, the “mechanical” revenue gain of $1.1 billion would be slashed to approximately $300 million once behavioral responses and reduced GST intake from lower consumer spending are accounted for.
The researchers calculated that the revenue-maximizing rate for New Zealand currently sits at around 56 percent. However, they caution that if taxpayers respond more aggressively than expected, the “peak” of that curve could be significantly lower, potentially nearing the current 39 percent mark.
Beyond the revenue implications, the study underscores the hidden “economic efficiency costs” of higher taxes. When a worker declines additional work because the take-home pay no longer justifies the loss of leisure time, society suffers a net loss in productivity. Currently, for every dollar of additional public revenue generated at the 39 percent tax rate, there is an estimated $1.20 in economic efficiency loss. Should the rate climb to 45 percent, that efficiency cost is projected to jump to roughly $2 per dollar raised.
The researchers argue that the debate shouldn’t just be about the rate itself, but about the trade-offs involved. While higher taxes on the wealthy could theoretically fund better healthcare, education, or redistribution, the actual impact on inequality hinges entirely on how that revenue is deployed.
As voters prepare to cast their ballots, economists are urging a more critical look at campaign manifestos. Beyond the headline figures, the key questions for the electorate remain: how much will these changes realistically raise, what will they cost the broader economy in lost productivity, and will the ultimate beneficiaries be the public services they are intended to support? For New Zealand’s next government, balancing these competing economic pressures will be a central—and difficult—challenge.
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