Free NZ Tax Refund Calculator

Find Out If IRD Owes You Money

Use our free tax refund calculator (also called a tax back calculator or tax return estimator) to see whether you’re likely owed a refund — based on your real income and PAYE paid, not a guess.

Based on IRD’s 2026/27 rates · Updated August 2026 · Not tax advice

Your Income Sources

Add every job or income source for the tax year — this automatically accounts for multiple jobs, secondary tax codes, and part-year work.

Income source	Income earned	PAYE tax paid

Find your income and PAYE figures on your payslips, your end-of-year summary, or in myIR under “Income tax.”

Interest/dividend income (optional)

RWT already paid on that income (optional)

Donations to approved organisations

I don’t receive Working for Families, an income-tested benefit, NZ Super, or a veteran’s pension (required for Independent Earner Tax Credit eligibility)

Updates automatically as you change any figure above

Estimated Refund

$0.00

Total income$0.00

Income tax owed (2026/27 brackets)$0.00

Independent Earner Tax Credit−$0.00

Donation tax credit (33.33%)−$0.00

Net tax liability$0.00

Total tax already paid (PAYE + RWT)$0.00

This is an estimate only. For your official refund or bill, log in to myIR and check your Income Tax Assessment — IRD runs automatic assessments for most employees between late May and July each year.

How Does This Tax Refund Calculator Work?

This tax back calculator compares the income tax you should owe on your total yearly income against the PAYE tax you actually had deducted. Add every income source you had during the year — including a second job — and it automatically accounts for over-withholding, part-year work, the Independent Earner Tax Credit, and any donation tax credits you’re entitled to.

Why Would IRD Owe Me a Tax Refund?

A refund happens when more PAYE was deducted from your pay across the year than your actual total tax liability. This is common because each employer calculates PAYE based only on what they pay you — not your full-year position across all income sources.

Working only part of the year

PAYE tables assume a full 12 months of that income rate, so a partial year usually means less total tax was actually owed.

A second job on a secondary tax code

Secondary income is taxed more conservatively by design, often over-withholding to avoid a year-end bill.

Wrong tax code

A missing “SL” for a student loan or missed IETC eligibility can throw off the whole calculation.

Unclaimed Independent Earner Tax Credit

Worth up to $520/year, often missed because it isn’t automatically factored into every payslip.

Eligible donations not yet claimed

33.33% of eligible donations is claimable as a tax credit but usually must be submitted, not applied automatically.

Income dropped mid-year

Redundancy or reduced hours mean tax withheld earlier in the year assumed a higher rate continued all year.

How Does IRD’s Automatic Tax Assessment Work?

Since 2019, Inland Revenue automatically assesses most salary and wage earners each year — you don’t need to file a return yourself. Between late May and July, IRD compares the PAYE you had deducted against your correct tax liability, then sends a notice through myIR showing whether you’re owed a refund or owe tax.

May–Jul

Assessment window

3–5 days

Payout after accepting

7 Feb

Deadline if you owe

4 years

Refund lookback window

If you’re self-employed, a contractor, or have income not taxed at source, you’ll need to file an IR3 return instead of relying on the automatic process.

Worked Example — Two Jobs, One Missed Refund

Sarah works two jobs: her main job pays $38,000 (taxed on an M code) and her part-time job pays $9,000 (taxed on a secondary code, which withholds more conservatively). Her combined income of $47,000 sits entirely within the 10.5–17.5% brackets, but because her secondary job withheld tax more cautiously, she likely had more PAYE deducted overall than her true combined liability — a textbook refund scenario.

Income source	Income	Tax code
Main job	$38,000	M
Part-time job	$9,000	Secondary (S)
Combined total	$47,000	—

Model your own multi-job scenario with the calculator above — just add a row per income source.

Independent Earner Tax Credit & Donation Credits

What Is the Independent Earner Tax Credit (IETC)?

A tax credit worth up to $520/year for people earning between $24,000 and $70,000, who don’t receive Working for Families, an income-tested benefit, NZ Super, or a veteran’s pension. It reduces gradually between $66,000–$70,000. An estimated 32% of eligible workers actually claim it.

Donation Tax Credits — Often Missed

If you donated to an approved donee organisation, you can claim a tax credit of 33.33% of the donated amount. Unlike PAYE, this is not applied automatically — you generally need to submit donation receipts through myIR.

Frequently Asked Questions

How much tax refund can I get in NZ?

It depends entirely on how much you were over-taxed. Common refunds range from small adjustments up to several hundred or a few thousand dollars for people with multiple jobs, part-year work, or unclaimed credits. Use the calculator above with your real figures for an accurate estimate.

How do I check if IRD owes me a tax refund?

Log in to myIR and check your Income Tax Assessment for the relevant year. If it shows a credit balance, you’re owed a refund. Most salary and wage earners don’t need to file anything — IRD assesses automatically between late May and July.

Is a tax refund calculator the same as a tax return calculator?

In everyday NZ usage, “tax refund calculator,” “tax back calculator,” and “tax return calculator” are generally used interchangeably. Technically, a “tax return” refers to the IR3 filing process used by the self-employed — most employees never file one and rely on IRD’s automatic assessment instead.

How far back can I claim a tax refund in NZ?

You can generally claim refunds going back four tax years. For the 2025–26 tax year, that means refunds can still be claimed back to the 2021–22 tax year.

Do I need to file a tax return to get a refund?

Most salary and wage earners don’t — IRD’s automatic assessment handles it. You only need to file an IR3 if you’re self-employed, have rental or business income, or want to claim deductions the automatic process doesn’t capture.

Why did my second job cause me to owe tax, not get a refund?

Secondary tax codes are designed to withhold conservatively to prevent a year-end bill, but if your secondary tax code was set too low for your combined income, under-withholding can happen instead — which is exactly why checking your actual combined position matters.

What is the Independent Earner Tax Credit and how does it affect my refund?

It’s a credit worth up to $520/year for people earning $24,000–$70,000 who don’t receive certain other government support. If it wasn’t applied to your payslips throughout the year, it can only be added at year-end via the assessment, potentially increasing your refund.

Can I claim donations after the tax year has ended?

Yes — donation tax credits are typically claimed after the fact through myIR, often alongside or shortly after your income tax assessment, using receipts from approved donee organisations.

Explore More Free NZ Calculators

Official Sources & References

Inland Revenue (IRD) — “Income tax for individuals” and automatic assessment process
Inland Revenue (IRD) — Independent Earner Tax Credit (IETC) eligibility and abatement rules
Inland Revenue (IRD) — Donation tax credit rules (33.33%)
myIR — Inland Revenue’s online services portal

Estimates only. Not tax advice — your official refund or tax bill is determined by Inland Revenue’s assessment. Confirm your position in myIR or with a registered tax agent.