Tax Year
New Zealand's tax year (also called the income year) runs from 1 April to 31 March — not the calendar year. When we refer to the '2025-26 tax year', we mean 1 April 2025 to 31 March 2026. This affects which tax rates, thresholds, and ACC levy caps apply to your income.
Most individuals have their tax automatically assessed by IRD after 31 March each year, using information reported by employers, banks, and other payers. If your tax affairs are straightforward (salary/wages only), you'll receive an income tax assessment in your myIR account — you don't need to file a return.
If you have more complex income (self-employment, rental, overseas) you'll need to file an IR3 tax return, typically due by 7 July (or 31 March the following year if you use a tax agent). Keep records of all income and expenses for at least 7 years.
Related Terms
IRD
Inland Revenue Department (IRD), commonly known as Inland Revenue or simply IRD, is the New Zealand government agency responsible for collecting taxes, distributing social support payments, and enforcing tax compliance.
Income Tax
New Zealand income tax is calculated using a progressive bracket system.
Tax Return / IR3
An IR3 is New Zealand's individual income tax return — an annual declaration of all your income, expenses, and tax credits filed with IRD.