Filing a New Zealand tax return can feel like a big job, especially if you have more than one income source or have missed a deadline. It is easier when you break it into a few clear steps.
This guide explains how to file your tax return in New Zealand: how to check whether you need to file, prepare your information and submit an individual income tax return, known as an IR3. You can file through Inland Revenue’s myIR service yourself, or ask a tax agent to prepare and file it for you.
If you are behind, you do not need to have every detail sorted before asking for help. Start by finding out which returns are outstanding and what records are available.
Step 1: Check whether you need to file
Many people whose only income is salary or wages have their tax worked out automatically by Inland Revenue. You may need to file an IR3 if you had income that was not taxed before you received it.
Common examples include:
- Self-employed, contractor or sole trader income
- Rental property income
- Overseas income
- Income from a partnership, trust or estate
- Some cash jobs or side income
In general, you may need to file if you received more than $200 of income that Inland Revenue was not told about. Inland Revenue can also ask you to file, so check myIR and any letters or messages you have received.
For more detail, see our guide to who needs to file an IR3 and the relevant due dates.
Step 2: Check the tax year and due date
New Zealand’s individual tax year usually runs from 1 April to 31 March. The standard deadline for filing an IR3 yourself is 7 July after the end of the tax year.
An extension may be available if you are linked to a tax agent and meet the relevant requirements. Do not assume an extension applies automatically. Check your myIR account or confirm the date with your tax agent.
If you are reading this in October 2026 and still need to file for the tax year ended 31 March 2026, the standard 7 July deadline has passed. Contact Inland Revenue or a tax agent to check what is outstanding and what to do next. Filing sooner can help you understand any tax owing and deal with it.
Step 3: Gather your information
Collect what you can before you start. You may not need every item on this list, as it depends on your income and circumstances.
Useful records can include:
- Your IRD number and current contact details
- Bank account details for a refund
- Income records, invoices and statements
- Business income and expense records
- Rental income and property expense records
- Overseas income details and tax paid overseas
- Receipts or other evidence for expenses you may be able to claim
- IRD letters or information about earlier tax years
If you run a business, make sure your income and expenses cover the full tax year. If you rent out a property, gather the rental statements and records for eligible property expenses.
You do not need to organise everything perfectly before you begin. Start with the records you have, then follow up on missing information. Keep supporting documents in case Inland Revenue asks to see them.
Step 4: Choose how you will file
You can file an IR3 online through myIR, Inland Revenue’s secure online service. You will need to sign in and select the relevant income tax return period.
In myIR, look for the option to file or open the return for the correct year. Follow the prompts to review the information, add any income or details requested, and complete any relevant schedules. The exact steps and labels can change, so use Inland Revenue’s current guide to filing an IR3 in myIR if you need help navigating the account.
You can also ask a tax agent to prepare and file the return for you. With Tax Doctor, the process is online: you send your records, your accountant prepares the return, and you review and approve it electronically. There is no need to print documents or visit an office.
Learn more about our individual IR3 tax return service.
Step 5: Review income and expenses carefully
Some information may already appear in your return because Inland Revenue has received it from an employer, bank or other payer. Check it rather than assuming it is complete. You may need to add income from sources that are not included.
If you are self-employed or have rental income, review the expenses connected to earning that income. An expense is not automatically deductible just because you paid it. The rules depend on the type of expense and how it relates to your taxable income.
For costs that have both personal and business use, you may need to claim only the business portion. For example, a phone or vehicle used for work and personal activities may need to be apportioned. Do not include private expenses as business deductions.
Our guide to sole trader tax deductions in New Zealand explains some common expense categories. If you are unsure whether a cost qualifies, check with Inland Revenue or an accountant before claiming it.
Step 6: Check the calculation before you submit
Before submitting, take a moment to review the return from beginning to end.
Check that:
- You have selected the correct tax year
- The income shown is complete and accurate
- Any relevant schedules have been included
- Expense claims are supported by your records
- Your contact and bank details are correct
- You understand whether the return shows a refund or tax to pay
If you are filing through myIR, follow the prompts to submit the completed return. Keep a copy of the confirmation and retain your records.
If an accountant is preparing your return, read the completed version before approving it. Ask about any figure you do not recognise. Once you approve it, your accountant can file it with Inland Revenue on your behalf.
Step 7: Act on the result
After you file, check your myIR account or filing confirmation for the outcome and any payment date. A return can result in tax to pay, a refund, or no balance owing.
If you have tax to pay but cannot pay it in full, do not ignore the notice. Contact Inland Revenue to discuss options, such as an instalment arrangement. A tax agent can also help you understand what is owed and communicate with Inland Revenue.
Filing and paying are separate steps. Submitting a return does not pay the balance automatically unless you have arranged payment through the relevant process.
If you have missed one or more returns
Being behind on tax returns can feel uncomfortable, but you can take it one step at a time. Start by checking myIR for the outstanding periods and messages from Inland Revenue. Gather whatever records you have, then ask for help if you need it.
You may need to file returns for more than one year. A tax agent can help identify which years are outstanding, prepare the returns and discuss any amount owing with Inland Revenue. If you cannot pay everything at once, ask about payment arrangements rather than waiting for the situation to become harder to manage.
Tax Doctor prepares current and overdue IR3 returns for people across New Zealand. We agree a fixed fee before work starts, give you a dedicated accountant and handle the process online, including electronic approval.
How to file your tax return: frequently asked questions
Can I file my New Zealand tax return online?
Yes. You can file an IR3 through Inland Revenue’s myIR service. You can also use a tax agent to prepare and submit it for you.
Do I need to file if I only earn a salary?
If your only income is salary or wages and Inland Revenue has enough information to assess your tax, you generally do not need to file an IR3. Check myIR and follow any request from Inland Revenue, especially if you have other income.
What if I do not have all my records?
Begin with the records you do have. Check bank statements, invoices and online accounts for missing details. If you are unsure what is required, contact Inland Revenue or an accountant before submitting.
Can someone help with overdue tax returns?
Yes. A tax agent can help check which returns are outstanding, prepare them and communicate with Inland Revenue. You can discuss the process and cost before work begins.
Filing is more manageable when you know what is required and what happens next. If you would like help with an IR3 or overdue returns, contact Tax Doctor. We can talk through your situation online and explain the next steps before you decide how to proceed.
This article provides general information, not personal tax advice. Your filing requirements depend on your circumstances. Check current Inland Revenue guidance or speak with an accountant if you are unsure.
