New Zealand tax returns: filing with Inland Revenue
New Zealand's personal income tax system is administered by Inland Revenue (IR). For most salary and wage earners, Inland Revenue automatically calculates whether any tax refund or debt exists at the end of the tax year — a process that requires no active filing. Individuals with more complex income sources, however, file an IR3 return. Understanding which process applies to a given situation is the starting point for New Zealand tax compliance.
What is New Zealand's tax year?
New Zealand's tax year runs from 1 April to 31 March. This is known as the income tax year, and all assessments, deadlines, and returns relate to this period. The 31 March year-end is a common point of confusion for people who have previously lived or worked in countries with different fiscal calendars.
When discussing income with a tax professional or using myIR, it is important to be clear about which tax year is being referred to — for example, the year ended 31 March 2026.
myIR: Inland Revenue's online service
myIR (ird.govt.nz/myir) is Inland Revenue's secure online portal. It is the primary platform for managing tax matters, including:
- Viewing income details and tax summaries
- Filing returns and checking refund or debt status
- Updating personal details and bank account information
- Responding to Inland Revenue correspondence
- Managing KiwiSaver and student loan accounts
Individuals register for myIR using their IRD number. Businesses and intermediaries have a separate myIR workspace. Most interactions with Inland Revenue are handled through myIR rather than paper forms or phone calls.
Automatic income tax assessments: do you need to file?
For individuals whose income is entirely from employment, interest, and dividends — where tax has been withheld at source through the PAYE (Pay As You Earn) system — Inland Revenue automatically issues an income tax assessment after the end of the tax year. This assessment calculates whether the correct amount of tax was paid during the year.
If the automatic assessment is correct, no further action is required. If it shows a refund or a debt, the individual can accept it or, if they believe it is incorrect, request a reassessment through myIR.
Not all income is captured automatically. In particular:
- Rental income from investment property
- Self-employment or contractor income
- Overseas income
- Business income
- Certain partnership or trust distributions
Individuals with these income types are generally required to file an IR3 return rather than relying on the automatic assessment process.
Who files an IR3?
An IR3 is the individual income tax return for New Zealand tax residents who have income not already captured by the PAYE system. Filing is required if, during the tax year, the individual received:
- Rental income
- Self-employed or contractor income above the prescribed threshold
- Income from overseas
- Certain shareholder salary income
- Income from a partnership, estate, or trust that is not distributed via PAYE
Inland Revenue provides detailed guidance on its website about who must file an IR3. A tax professional can confirm the requirement for a specific situation.
What is the general filing deadline for an IR3?
For individuals filing an IR3 without a registered tax agent, the general filing deadline is 7 July following the end of the tax year (i.e., 7 July 2026 for the year ended 31 March 2026). Inland Revenue confirms exact dates annually.
Individuals who use a registered tax agent — a tax professional who files on behalf of clients — may benefit from an extended filing deadline. Tax agents manage their own filing extension arrangements with Inland Revenue under a separate scheme. This is one practical reason many people with complex income sources engage a professional rather than filing independently.
If a return is filed late or tax is paid after the due date, use-of-money interest and late payment penalties may apply. Inland Revenue's website provides the current penalty and interest rates.
Non-residents and overseas income
New Zealand tax residents are taxed on worldwide income. New Zealand non-residents are generally taxed only on New Zealand-sourced income. Residency for tax purposes is determined by Inland Revenue based on factors including the presence of a permanent place of abode and the number of days spent in New Zealand — not simply citizenship or visa status.
Double tax agreements (DTAs) between New Zealand and a number of countries can affect how overseas income is taxed and where primary taxing rights sit. These are technical determinations that benefit from professional input.
Where to get help
A Chartered Accountant or tax agent registered with the relevant New Zealand professional bodies can assist with IR3 filing, residency questions, and any correspondence with Inland Revenue.
Find recognised tax professionals in New Zealand
Sources
Inland Revenue, New Zealand — ird.govt.nz