When the 39% tax rate was legislated in December 2020, the Government also introduced a new power for Inland Revenue to collect information to assist with the development of tax policy. The first high-profile use of this power has been to collect extensive information about some of New Zealand’s wealthiest New Zealanders. Inland Revenue describes the project as follows:
“The project seeks to fill a gap in our knowledge of effective tax rates in relation to economic measures of income, particularly for high-wealth individuals. Gaining this information will help us assess the fairness of our tax system, and allow us to provide more robust advice on future tax policy. The project will not make policy recommendations, but may feed into future policy advice. … The effective tax rates calculated will compare the amount of tax paid by an individual with different measures of income – including a measure of economic income. Using different income measures allows as to assess what is fair through different lenses. Economic income is a broader concept than taxable income – it seeks to measure the increase in an individual’s ability to consume goods and services in a period.”
Information is currently being collated and it's expected that a report will be made publicly available in June 2023.