Taxation principle | Description |
Horizontal equity | People with similar levels of income should pay similar amounts of tax. The time value of money matters when considering horizontal equity. The tax system should generally recognise the economic effect of income, not its name, while acknowledging there are important areas where exemptions to taxing economic income are justified in the pursuit of wider societal outcomes (eg. not taxing the imputed rent or gains on an owner-occupied home). |
Efficiency | Tax revenue should be raised in ways that minimise distortions to the economy and the use of resources. |
Vertical equity | The tax system should be progressive. Tax is progressive if people with higher levels of economic income pay a higher proportion of that income in tax. A progressive tax system does not mean that every tax should be progressive (eg. GST is regressive) but the overall system ought to be. In practice, wealthy people should at the very least pay no lower a rate of tax on their economic income than middle income New Zealanders already do. |
Revenue integrity | The revenue system should be sustainable over time and minimise opportunities for tax avoidance and tax evasion. |
Compliance and administrative costs | Compliance and administrative costs for taxpayers and the Government should be reasonable, but this is not justification for substantial unfairness in the tax system. |
Certainty and predictability | People should be able to determine their tax obligations before they are due. |
Flexibility and adaptability | The tax system should keep pace with changes in society, in particular technological and commercial developments, and changes in inequality. |