Most New Zealand employees with only PAYE income don’t need to file a tax return — IRD auto-assesses them. But if you have rental income, business income, overseas income, or used the wrong tax code, you need to file an IR3. This step-by-step guide walks you through it.
You must file an IR3 if you earned rental income, business income, overseas income, or received more than $200 in investment income not already taxed. The deadline is 7 July (without a tax agent) or 31 March the following year (with an agent). File online at myir.ird.govt.nz — most IR3s take 20–40 minutes to complete.
Do I Need to File a Tax Return?
You do NOT need to file an IR3 if:
- You only had PAYE employment income from one or two jobs (with correct tax codes)
- IRD has auto-assessed you and you agree with the result
- You have only bank interest that was already taxed at source (RWT)
You MUST file an IR3 if you had:
- Rental property income (from residential or commercial property)
- Self-employment or business income (any amount)
- Overseas income (even if taxed in the overseas country)
- Schedular/contract income over $200 where tax was not withheld
- A student loan and overseas income
- Income from a trust (as a beneficiary)
- You are applying for Working for Families tax credits (use IR3 + IR526)
You SHOULD file if:
- You used the wrong tax code and believe you have overpaid or underpaid
- You have significant deductible expenses not captured through PAYE
- You received a redundancy payment
NZ Tax Year and Deadlines
The NZ income tax year runs from 1 April to 31 March.
| Event | Date |
|---|---|
| Tax year ends | 31 March |
| IRD issues income tax assessments | April – May |
| IR3 due (self-filers) | 7 July |
| IR3 due (with registered tax agent) | 31 March (following year) |
| Tax bill due (standard) | 7 February (following year) |
| Tax bill due (with tax agent) | 7 April (following year) |
| Refunds issued | Typically within 2 weeks of filing |
Step-by-Step: Filing Your IR3 via myIR
Step 1: Set Up myIR
If you don’t already have a myIR account, set one up at myir.ird.govt.nz. You need your IRD number and a RealMe or RealMe verified identity.
Step 2: Gather Your Information
Before you start, collect:
- Income details:
- Employer earnings summaries (available in myIR — pre-populated from payroll data)
- Bank interest statements (your bank provides this or it may be pre-populated)
- Rental income records (total rent received)
- Business income records (total invoices/receipts)
- Overseas income (in NZD, converted at the exchange rate on the date received)
- Deduction records:
- Rental property expenses (rates, insurance, maintenance, mortgage interest)
- Business expenses (check ird.govt.nz for what’s deductible)
- Charitable donations (for a donation tax credit)
- KiwiSaver contributions if you are self-employed
Step 3: Start the IR3 in myIR
Log in to myIR → Income tax → File a return. Select the relevant tax year.
Most data is pre-populated from IRD’s records (employer summaries, interest income, KiwiSaver). Review each section carefully — pre-populated data is not always complete or correct.
Step 4: Complete Each Section
Wages and salary: Confirm the pre-populated figures. If wrong, contact your employer for a corrected employer summary.
Interest income: Pre-populated from bank reporting. Check against your bank statements.
Rental income: Enter total rent received and all deductible expenses. Common rental deductions:
- Mortgage interest (fully deductible from 1 April 2025 for all residential rental properties)
- Rates (council rates)
- Insurance premiums
- Property management fees
- Maintenance and repairs (not capital improvements)
- Depreciation on chattels (not land or building)
Business income: Report total receipts minus allowable expenses. If this is complex, consider using a tax agent or accounting software.
Overseas income: Report all overseas-sourced income. Foreign tax paid may be available as a credit — see IRD’s foreign tax credit rules.
Step 5: Claim Deductions and Credits
Don’t miss these:
- Independent Earner Tax Credit (IETC): If you earned $24,000–$48,000 and didn’t use tax code ME, claim this (worth up to $520)
- Donation tax credits: 33.33% of eligible donations (receipts required)
- Housekeeper credit: If you paid for childcare or home help due to disability (limited circumstances)
- Working for Families: Claim via a separate application (WFF is not on the IR3 itself)
Step 6: Review and Submit
MyIR calculates your tax automatically. Review the outcome:
- Refund: Paid to your nominated bank account, typically within 2 weeks
- Tax to pay: Due by 7 February (or 7 April with a tax agent). You can pay via myIR, internet banking, or by post.
Step 7: Keep Records
Retain all income and expense records for 7 years (IRD may audit up to 7 years in non-fraud cases).
Using a Tax Agent
A registered tax agent (accountant or tax advisor) can:
- File on your behalf with an extended deadline (31 March the following year)
- Review your return for errors and missed deductions
- Represent you if IRD audits or queries your return
For simple returns (single rental property, straightforward self-employment), many agents charge $200–$500. For complex situations, expect more. Check whether the cost is worth it — agents are generally deductible as a business expense for self-employed filers.
Frequently Asked Questions
Do I need to file a tax return as an employee in NZ?
Usually not — if you only had PAYE employment income and correct tax codes, IRD auto-assesses you. Check myIR to see if an assessment has been issued. If you agree with it, no action is needed. Only file an IR3 if you have other income or want to claim deductions not captured in PAYE.
What happens if I miss the IR3 deadline?
IRD charges late filing penalties starting at $50 for returns under $100,000 in tax, plus use-of-money interest on late tax. File as soon as possible — late is better than never. If you cannot pay on time, contact IRD before the due date to arrange a payment plan.
How do I get a NZ tax refund?
Most refunds arise from auto-assessments where you overpaid PAYE. Check myIR in May after year end (31 March) — if you are owed a refund, it will be visible. Click to accept and nominate your bank account. Refunds are typically paid within 1–2 weeks. If you have a tax debt, IRD applies your refund against the debt first.
Can I claim home office expenses on my tax return?
If you are self-employed and work from home, you can claim a proportion of home costs (rent, mortgage interest, rates, power, insurance) based on the proportion of your home used for business. If you are an employee working from home, the rules are more restrictive — you generally cannot claim home office expenses unless your employer requires it and you bear the cost.
What is an income tax assessment and how does it differ from an IR3?
An income tax assessment is IRD’s calculation of your tax based on the information they already hold (PAYE data, bank interest, etc.). It is issued automatically each year through myIR. An IR3 is a self-filed return where you provide the information — required when you have income IRD does not automatically receive.