How to File Your Tax Return in NZ
Contents (9 sections)
- Do you actually need to file a tax return?
- Key dates and deadlines for the 2025-26 tax year
- How to file through myIR: step by step
- What income to include
- Tax credits and deductions you can claim
- What happens if you owe tax or get a refund
- Common mistakes that trigger IRD letters
- Common questions
- What to do next
Most New Zealanders on salary or wages don't need to file a tax return at all. IRD automatically calculates your tax at the end of each tax year and sends you a refund or bill if your PAYE was slightly off (IRD). You only need to file an individual tax return (IR3) if you earned income that wasn't taxed at source, like rental income, self-employment earnings, or overseas income.
Use the Forge Money PAYE calculator to check what your tax on salary and wages looks like before you start.
Do you actually need to file a tax return?
Most people panic about tax returns unnecessarily. Here's how to work out if you actually need to file one.
You probably don't need to file if:
- You only earned salary or wages from one or more NZ employers
- Your only other income was interest or NZ dividends that had tax deducted at source (RWT)
- You didn't earn more than $200 in untaxed income during the year
IRD's automatic income tax assessment handles these situations. You'll get a letter or myIR notification between May and July telling you if you owe tax or are getting a refund. No action required (IRD).
You do need to file an IR3 if:
- You earned self-employment or sole trader income
- You received rental income from a property
- You received overseas income (salary, interest, dividends, or FIF income)
- You're a partner in a partnership or a shareholder-employee in a close company
- You received income without tax deducted and it totalled more than $200
- IRD specifically asked you to file one
You might want to file voluntarily if:
- You had income taxed at the wrong rate (for example, secondary tax on a second job) and want to claim a refund sooner
- You have donation tax credits to claim over $5 (you can also claim these separately)
- You want to square up your tax position before the automatic assessment
Decision flowchart: Do you need to file?
| Question | If yes | If no |
|---|---|---|
| Did you earn self-employment income? | File an IR3 | Next question |
| Did you earn rental income? | File an IR3 | Next question |
| Did you earn overseas income? | File an IR3 | Next question |
| Did you earn more than $200 in untaxed income? | File an IR3 | Next question |
| Did IRD ask you to file? | File an IR3 | Next question |
| Were you a partner or shareholder-employee? | File an IR3 | You don't need to file. Wait for your automatic assessment. |
If you're unsure, log into myIR and check. IRD will tell you whether you need to file (IRD).
Key dates and deadlines for the 2025-26 tax year
The NZ tax year runs from 1 April to 31 March. Here are the dates that matter for the 2025-26 year (IRD):
| Date | What happens |
|---|---|
| 31 March 2026 | 2025-26 tax year ends |
| 1 April 2026 | 2026-27 tax year begins |
| May to July 2026 | IRD issues automatic income tax assessments for salary/wage earners |
| 7 July 2026 | Deadline to file your IR3 if you don't have a tax agent |
| 31 March 2027 | Extended deadline if you have a tax agent with an extension of time arrangement |
If you miss the 7 July deadline without a tax agent, IRD can charge late filing penalties. These start at $50 and increase from there (IRD). Getting a tax agent gives you an automatic extension until 31 March of the following year, which is why many people use one.
Provisional tax dates
If you have to pay provisional tax (because you had more than $5,000 of residual income tax in the previous year), you'll have payment dates during the year (IRD):
| Payment | Standard option (3 instalments) | GST ratio option |
|---|---|---|
| Instalment 1 | 28 August 2025 | Aligned with GST return dates |
| Instalment 2 | 15 January 2026 | Aligned with GST return dates |
| Instalment 3 | 7 May 2026 | Aligned with GST return dates |
The AIM (Accounting Income Method) option lets you pay provisional tax based on actual income every one or two months, which suits businesses with irregular income (IRD).
How to file through myIR: step by step
Filing an IR3 through myIR is the most common method. Here's the process (IRD):
Step 1: Log into myIR
Go to myir.ird.govt.nz and log in. If you don't have a myIR account, you'll need to register first. You'll need your IRD number and a form of identity verification.
Step 2: Check your pre-populated information
IRD pre-fills your return with income they already know about, including wages (from employer payroll filings), interest (from bank RWT certificates), and NZ dividends. Check these figures against your own records. If something is missing or wrong, you can edit it.
Step 3: Add any additional income
This is where you add income IRD doesn't already know about:
- Rental income (total rent received minus expenses)
- Self-employment or freelance income
- Overseas income (employment, interest, dividends, FIF)
- Any other income not already showing
Step 4: Claim deductions and expenses
If you're self-employed, add your business expenses. If you have rental income, add your property expenses. Common deductions include:
- Business expenses (for self-employed income)
- Rental property expenses (rates, insurance, maintenance, management fees, interest)
- Income protection insurance premiums
- Donation tax credits (for donations over $5 to approved charities)
Step 5: Review and submit
MyIR calculates your tax based on everything you've entered. Review the summary. It will show you either tax to pay or a refund owing. If the numbers look right, submit. You can save a draft and come back later if you need to.
Step 6: Pay any tax owing or receive your refund
If you owe tax, IRD will give you a due date for payment. If you're getting a refund, it typically arrives within 10 working days of your assessment being finalised (IRD). Refunds go directly to the bank account linked to your IRD number.
What income to include
Your IR3 must include all income from the tax year, regardless of source. Here's what counts (IRD):
| Income type | Where to find the figure | Tax treatment |
|---|---|---|
| Salary and wages | Pre-populated from employer records | PAYE already deducted |
| Bank interest | Pre-populated from bank RWT certificates | RWT already deducted (may need adjustment) |
| NZ dividends | Pre-populated or from dividend statements | Imputation credits may apply |
| Self-employment income | Your own records / accounting software | No tax deducted, declared in full |
| Rental income | Your own records | Net rental income after expenses |
| Overseas employment income | Your overseas payslips / records | May have foreign tax credits |
| Overseas interest and dividends | Your own records | Foreign tax credits may apply |
| FIF income | Calculated using FDR or another method | Based on opening market value |
| Cryptocurrency gains | Your own records | Taxable if acquired for disposal |
| PIE income | Not usually included (taxed at source) | Only if PIR was incorrect |
PIE fund income is generally excluded from your return because it's taxed at your PIR by the fund itself. The exception is if your PIR was set incorrectly, in which case you may need to square up (IRD).
Tax credits and deductions you can claim
Several credits and deductions can reduce your tax bill (IRD):
Donation tax credits: If you donated $5 or more to an approved charity or organisation during the tax year, you can claim a 33.33% tax credit on donations up to your total taxable income. You'll need receipts. This is the most commonly missed credit (IRD).
Independent earner tax credit (IETC): If your income is between $24,000 and $48,000, you may qualify for the IETC, worth up to $520 per year. It phases out between $44,000 and $48,000 (IRD).
Foreign tax credits: If you paid tax on overseas income in another country, you can usually claim a credit to avoid being taxed twice. The credit is limited to the lesser of the foreign tax paid or the NZ tax on that income (IRD).
Expenses against income: If you're self-employed or earn rental income, you can deduct legitimate business or rental expenses from that income before tax is calculated. See our guide to tax on rental income for rental-specific deductions.
What happens if you owe tax or get a refund
If you're getting a refund: IRD deposits it directly into your nominated bank account, usually within 10 working days of your assessment being completed. The most common reason for a refund is over-deduction of PAYE, particularly if you changed jobs, worked part of the year, or had secondary tax deducted incorrectly (IRD).
If you owe tax: IRD will tell you the amount and the due date. For IR3 filers, tax is generally due on 7 February of the following year if you don't have a tax agent. If the amount is more than you can pay in one go, you can set up an instalment arrangement through myIR. IRD charges use-of-money interest on late payments at 10.91% (IRD, 2025-26).
If your residual income tax is over $5,000: You'll need to pay provisional tax the following year, which means paying estimated tax in instalments throughout the year rather than a lump sum at the end (IRD).
Common mistakes that trigger IRD letters
These are the errors that most often lead to IRD follow-up (IRD):
Forgetting overseas income. NZ tax residents are taxed on their worldwide income. If you have a savings account in Australia, earn dividends from US shares, or received any overseas income, it must be declared. IRD receives information from foreign tax authorities through the Common Reporting Standard (CRS).
Getting your PIR wrong. If your Prescribed Investor Rate on PIE funds is set too low, you'll underpay tax. IRD can identify this and adjust your assessment. Check your PIR is correct by reviewing your income over the past two years (IRD).
Not declaring cryptocurrency income. If you bought cryptocurrency with the intention of selling it, any gains are taxable income. IRD has been actively investigating crypto transactions since 2020.
Missing the filing deadline. Late filing incurs penalties starting at $50, increasing with time. If you know you'll be late, contact IRD or engage a tax agent before the deadline.
Not claiming donation receipts. This is a missed opportunity rather than a mistake, but thousands of New Zealanders miss out on donation tax credits each year simply by not claiming them.
Incorrectly claiming expenses. For self-employed and rental income, only legitimate business expenses are deductible. Personal expenses, capital expenditure, and entertainment are common areas where people overclaim.
Common questions
Do I need to file a tax return in New Zealand?
Most salary and wage earners don't need to file. IRD automatically assesses your tax between May and July each year. You only need to file an IR3 if you earned self-employment income, rental income, overseas income, or more than $200 in other untaxed income during the tax year (IRD).
When is the tax return deadline in NZ?
The standard IR3 filing deadline is 7 July following the end of the tax year (which runs 1 April to 31 March). If you use a tax agent, the deadline extends to 31 March of the following year. For the 2025-26 tax year, the standard deadline is 7 July 2026 (IRD).
How do I file a tax return in NZ?
Log into myIR at myir.ird.govt.nz, check your pre-populated income, add any additional income (self-employment, rental, overseas), claim deductions, and submit. IRD calculates your tax and tells you if you owe money or are getting a refund. The whole process takes 15 to 30 minutes if your records are organised (IRD).
What happens if I don't file my tax return?
If you're required to file and don't, IRD can charge late filing penalties starting at $50, with additional penalties added over time. They may also issue a default assessment based on estimated income, which could result in a higher tax bill than if you'd filed correctly. Use-of-money interest also applies to any outstanding tax (IRD).
How long does an IRD refund take?
Refunds from individual tax returns typically take around 10 working days after your assessment is finalised. Automatic assessments (for salary and wage earners) are processed between May and July, with refunds paid shortly after. If your refund seems delayed, check myIR for any outstanding items or queries on your account (IRD).
Can I file a tax return to get a refund if I don't need to file?
Yes. If you think you've overpaid tax (for example, secondary tax was deducted on a second job), you can file a return or simply wait for your automatic assessment. For most people, IRD's automatic process catches overpayments and issues refunds without you doing anything (IRD).
Do I need a tax agent or accountant to file?
Not necessarily. If your situation is straightforward (one or two income sources, no complex deductions), myIR is designed for you to file yourself. A tax agent is worth considering if you have multiple income sources, significant expenses to claim, overseas income, or if you want the extended filing deadline. Tax agent fees for a basic IR3 typically range from $150 to $500 (IRD).
What income do I need to declare on my tax return?
All income earned during the tax year, from any source, worldwide. This includes salary, wages, self-employment income, rental income, interest, dividends, overseas income, and certain capital gains. PIE income is generally excluded because it's already taxed at source. The key rule: if in doubt, declare it (IRD).
How do I claim donation tax credits?
You can claim donation tax credits through myIR by entering the total donations made to approved organisations during the tax year. You'll need receipts. The credit is 33.33% of the donation amount, up to your total taxable income. For example, $1,000 in donations gives you a $333 tax credit (IRD).
What's the difference between an IR3 and an automatic assessment?
An automatic assessment (or income tax assessment) is done by IRD for people who only earn salary, wages, interest, and NZ dividends. IRD calculates everything for you. An IR3 is a tax return you file yourself, required when you have income types that IRD can't automatically assess, like self-employment or rental income (IRD).
What to do next
- Calculate your take-home pay to check your PAYE, ACC, and KiwiSaver deductions
- Understand NZ tax brackets and how progressive tax rates work
- Learn about tax on investment income if you earned interest, dividends, or FIF income
- Read about tax on rental income if you're a landlord filing for the first time
- Check your KiwiSaver contribution rate and how it affects your overall tax position
Last updated: 1 March 2026. Sources: IRD (ird.govt.nz). This is financial information, not financial advice.
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This is educational content, not financial advice.