New Zealand taxes for Americans: Inland Revenue, the IRS and how the two fit

Here's the deal: once you live in Auckland, New Zealand's Inland Revenue (IRD) taxes you as a resident, and because you're American, the IRS still wants a return too. The good news is that most new arrivals get a four-year break on their foreign investment income, and the US–New Zealand tax treaty plus US foreign tax credits keep most salaried Americans from paying twice.

The short version

• You become a New Zealand tax resident after more than 183 days in any 12-month period or once you have a permanent place of abode here [1].
• New arrivals get a break. As a transitional resident, most of your foreign income is exempt in New Zealand for about 4 years, including US interest, dividends and rent. Your pay isn't [2].
• Rates from April 1, 2025 run from 10.5% to 39% above NZD 180,000 [3]. The New Zealand tax year runs April 1 to March 31.
• The US–New Zealand tax treaty dates from 1982, with a 2008 protocol [4]. There's no totalization agreement for Social Security [5].
• On your US return, use the foreign tax credit or the foreign earned income exclusion (USD 130,000 for 2025, USD 132,900 for 2026), and file an FBAR if your foreign accounts top USD 10,000 [6][7].

USD conversions use the Federal Reserve H.10 rate of October 30, 2026 (NZD 1 = USD 0.5637), rounded. This is general information, not tax advice.

Are you a New Zealand tax resident?

IRD uses two tests, and you're a resident from whichever happens first [1]:

1. The 183-day test. You've been in New Zealand for more than 183 days in any 12-month period. Part days count as whole days, the days don't need to be in a row, and residency is backdated to the first of those days [1].
2. Permanent place of abode. You have a place you usually live in New Zealand. You don't need to own it, and IRD looks at your whole situation: how long you're here, your family and economic ties, and whether you mean to stay [1].

In practice, if you've moved to Auckland on a work or partner visa, signed a lease and started a job, you're almost certainly a resident from day one. Leaving is harder: you stop being a resident only when you have no permanent place of abode here and you've been away for more than 325 days in a 12-month period [1]. Keep that in mind if you hang on to a house in Auckland after moving back to the States.

The transitional resident exemption

This is the rule Americans should know before they arrive, and it's a generous one. You're a transitional tax resident if you're a new migrant (or a returning New Zealander), and you weren't a New Zealand tax resident at any time in the 10 years before you qualified [2]. You qualify automatically, but only once [2].

What it covers

For about 4 years, most foreign-source income is exempt from New Zealand tax, including overseas interest, dividends, foreign investment fund (FIF) income and rent [2]. That means the dividends from your US brokerage account and the rent from your condo back home stay off your New Zealand return.

What it doesn't cover

• Pay for employment or personal services earned overseas isn't exempt, though a tax treaty may give full or partial relief [2]. And pay for work you do in New Zealand is New Zealand income anyway.
• Uncle Sam doesn't care. The exemption is New Zealand's. The IRS still taxes your worldwide income every year.

When it ends

The exemption runs until about 4 years after the end of the month you first qualified as a resident [2]. It ends early if you or your transitional-resident partner apply for Working for Families tax credits, if you include exempt income on your IR3 return, or if you tell IRD you no longer want it [2]. After that, New Zealand taxes your worldwide income, and the FIF rules can tax US shares and funds even when you haven't sold. That's a big change, so plan before year four with a US expat tax preparer who also knows New Zealand rules. IRD itself says the calculation can be complex [2].

New Zealand tax rates

Here are IRD's rates for individuals from April 1, 2025 [3]:

Most employees have tax taken out of each paycheck through PAYE withholding. Note the 15% GST is a consumption tax built into prices, not part of your income tax [8].

How it fits with your US return

The treaty

The US–New Zealand income tax treaty was signed in 1982 and updated by a 2008 protocol [4]. It sets out which country taxes which kinds of income first and helps prevent double taxation. Like most US treaties, it doesn't let US citizens escape US tax on their worldwide income. Its main job for you is deciding which country gets the first bite.

Foreign tax credit or exclusion

New Zealand's top rates are high enough that many salaried Americans in Auckland owe little or nothing extra to the IRS. You have two main tools:

The credit often wins when your New Zealand tax is higher than your US tax would be. The exclusion only covers earned income, so it won't help with US dividends or rent. Here's the catch with the transitional exemption: because New Zealand isn't taxing your US investment income for those 4 years, there's no New Zealand tax to credit, so you pay full US tax on it. See FEIE vs the foreign tax credit.

Different tax years

New Zealand's tax year runs April 1 to March 31, and the US year is the calendar year. You'll split New Zealand income across two US returns, so keep your payslips and IRD statements organized.

Social Security: no totalization agreement

The US has totalization agreements with about 30 countries, including Australia, but New Zealand isn't one of them [5]. That matters in two ways:

• Self-employed? Without an agreement, US citizens working for themselves generally still owe US self-employment tax on their earnings, even while living in New Zealand. See self-employed abroad.
• Benefits: there's no way to combine US and New Zealand coverage under an agreement, so plan to qualify for US Social Security on your US work record alone. Check your record in your my Social Security account before you go. See Social Security abroad.

Reporting your New Zealand accounts

Your Kiwi bank account, KiwiSaver and investments all count on the US side:

1. FBAR (FinCEN Form 114): file if your foreign accounts together exceed USD 10,000 at any time in the year. It's due April 15 with an automatic extension to October 15, filed through FinCEN's BSA E-Filing System, not with your tax return [7].
2. Form 8938 (FATCA): if you live abroad, file when your foreign financial assets exceed USD 200,000 at year-end or USD 300,000 at any time (single), or USD 400,000 / USD 600,000 if married filing jointly [7].
3. KiwiSaver and New Zealand funds may count as foreign trusts or PFICs for US tax, which brings extra forms and tough rules. Read IRD number and KiwiSaver: US tax issues before you sign up at work.

A first-year checklist

1. Get your IRD number as soon as you arrive.
2. Note the date you became a resident. It sets the start of your transitional period [2].
3. Keep US investments in the US during the exemption, and think hard before buying New Zealand funds.
4. Track your New Zealand tax by calendar year for your Form 1116.
5. File the FBAR by October 15 if you crossed USD 10,000.
6. Get help for the year-four switch. A US expat tax preparer can check your situation before the exemption ends.

Questions about who people use and what it cost? Our community group for Americans in New Zealand is a good place to compare notes.

Sources

1. Inland Revenue: Tax residency status for individuals
2. Inland Revenue: Temporary tax exemption (transitional residents)
3. Inland Revenue: Tax rates for individuals
4. IRS: New Zealand tax treaty documents
5. SSA: US international Social Security agreements
6. IRS: Figuring the foreign earned income exclusion
7. IRS: Comparison of Form 8938 and FBAR requirements
8. Inland Revenue: GST
9. Federal Reserve: H.10 foreign exchange rates

Keep reading

• IRD number and KiwiSaver: US tax issues
• Banking in New Zealand as an American
• FEIE vs the foreign tax credit
• PFICs: why foreign funds hurt Americans