IRD Number NZ: How to Apply & the 4-Year Migrant Exemption (2026)

An IRD number is New Zealand’s tax ID, and it is the single highest-leverage piece of admin you will do after landing: without one, your employer must withhold tax at the 45% no-notification rate and your bank applies the highest rate to your interest. Applying as a new arrival takes about 10 minutes online and the number usually arrives within 2 working days.

Why this comes before almost everything else

The dependency chain is short and brutal:

1. No IRD number → employer withholds 45% of your pay
2. No IRD number → bank deducts interest tax at the highest resident withholding rate
3. No IRD number → KiwiSaver enrolment, tax refunds and any income tax assessment all stall

New Zealand does not assign you a number automatically at the border. You apply, once, and keep it for life.

How to apply: the new-arrival fast lane

If you are in New Zealand on an INZ-granted visa, use the simplified online application at ird.govt.nz:

1. Your passport details
2. The Immigration Application Number from your visa approval letter
3. Tick the authorisation letting Immigration New Zealand share your identity documents with Inland Revenue

That authorisation is what makes it fast: IRD reuses the identity verification INZ already did, so no certified document copies, no bank letters. The number arrives by text or email, usually within 2 working days.

Applying from overseas instead

If you need the number before you travel, the paper route works but is slower — allow up to 20 working days plus postage. You will need:

• photo ID (passport)
• proof of address (e.g. a utility letter)
• your home country’s tax identification number (TIN)
• proof of your reason for applying (working, buying property)
• a fully functioning NZ bank account, or an IR997 customer due diligence form completed by a NZ reporting entity

That last item is the real bottleneck, which is why the recommended sequence is: open the bank account from overseas → activate it on arrival → apply for the IRD number the same week. More on that in our bank account guide.

IRD number ≠ tax residency — and the 183-day rule

Having a number says nothing about how you are taxed. That is decided by residency:

• More than 183 days in NZ in any 12-month period → you become a tax resident, backdated to the first of those days. Arrival and departure days each count as a full day.
• A permanent place of abode in NZ → tax resident regardless of day count.

Residency matters because NZ tax residents are taxed on worldwide income; non-residents only on NZ-source income.

The 4-year transitional exemption: the most valuable thing nobody tells new migrants

If you are a new migrant (or a returning Kiwi who was not tax resident in the last 10 years), you automatically qualify as a transitional tax resident:

• For roughly 4 years from the day you become tax resident, most overseas income is exempt from NZ tax: foreign interest, dividends, foreign investment fund income, overseas rent.
• You do not apply for it. It applies automatically, once per lifetime.

Two traps:

1. Overseas employment income is not exempt. Work remotely for an overseas employer while living in NZ and that salary is taxable here from day one (double tax agreements may soften this).
2. Claiming Working for Families ends the exemption early — for you and, if they claim, your partner. Run the numbers before opting in: for families with significant overseas assets, the exemption can be worth far more than the credits.

Using the number day to day

Starting a job: fill in an IR330 tax code declaration and hand your employer the IRD number plus your tax code (most new migrants on a single job use code M). Use IRD’s online tax code tool if your situation is less standard.

Bank interest: tell your bank your IRD number and choose your RWT rate. Skip this and the bank deducts at the highest rate by default — you can reclaim the difference, but only via an assessment.

Most employees never file a return. If your only income is salary with correct PAYE, Inland Revenue runs an automatic assessment after the tax year ends (31 March) and pays out refunds without you doing anything.

If you leave New Zealand

The number stays yours forever, but your status may change:

• Away for more than 325 days in any 12-month period AND no permanent place of abode in NZ → you become a non-resident taxpayer, backdated to the day you left.
• Tell your NZ bank you are now non-resident so interest is taxed under NRWT rules instead of RWT.
• Still earning NZ income (rent, dividends)? You may need to file a non-resident IR3NR return. If your only NZ income is interest/dividends with tax correctly deducted, no return is needed.
• Leaving permanently mid-year? You can ask IRD (via myIR) to finalise your tax position early rather than waiting for year-end — worth doing if a refund is likely.

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Working out your first payslip? The take-home pay calculator shows exactly what PAYE, ACC levy and KiwiSaver do to a NZ salary. And if you have not done the rest of the arrival admin, the first 30 days checklist puts this in sequence with banking, housing and healthcare.