Americans who relocate to New Zealand for a job transfer, a partner, or a fresh start abroad quickly learn that two governments now expect a tax return every year: Inland Revenue in New Zealand and the IRS back home. US expat taxes in New Zealand are not optional, and moving to Auckland, Wellington, or anywhere else in the country does not end a filing obligation with either government. New Zealand taxes its tax residents on worldwide income, and the United States separately taxes its citizens and green card holders on worldwide income no matter where they live, so an American living in New Zealand typically owes both a New Zealand return and a US Form 1040 for the same tax year. The entire planning exercise, from the Foreign Earned Income Exclusion to the Foreign Tax Credit to KiwiSaver and investment reporting, exists to make sure the same dollar of income is never taxed twice.
Do US Citizens Living in New Zealand Have to File Both New Zealand and US Tax Returns?
Yes, in almost every case. New Zealand taxes individuals who qualify as tax residents, a status Inland Revenue determines using tests based on having a permanent place of abode in the country or spending a substantial part of the year there, on their worldwide income. The United States separately taxes its citizens and green card holders on worldwide income no matter where they live, a rule that has nothing to do with New Zealand tax residency and everything to do with US citizenship or immigration status.
That means the two filing obligations run independently of each other. Filing and paying tax in New Zealand does not excuse you from filing a US Form 1040, and filing a US return does not excuse you from your New Zealand obligations. The mechanisms that keep the same dollar of income from being taxed twice, the Foreign Earned Income Exclusion, the Foreign Tax Credit, and the US-New Zealand tax treaty, operate on the US side of that equation, not as a substitute for either filing.
How Does New Zealand Tax Residents on Worldwide Income?
New Zealand applies its income tax on a worldwide basis to anyone who qualifies as a tax resident, and Inland Revenue collects most of it through employer withholding under the PAYE system, mechanically similar to US payroll withholding.
New Zealand has no general capital gains tax, one of the more distinctive features of its system compared to the graduated capital gains treatment under US law, though specific transactions, such as certain land sales, can still be taxed under narrower rules. New Zealand also offers a transitional resident exemption for new migrants, which can exempt most foreign-source income, other than employment income for services performed in New Zealand, for roughly the first several years after someone becomes a New Zealand tax resident. Because the exact duration and scope of that exemption depend on residency history and the type of income involved, it should be confirmed against current Inland Revenue guidance before being relied on, and it never exempts anyone from the parallel US filing obligation in the meantime.
Should You Claim the FEIE or the Foreign Tax Credit on New Zealand Income?
For Americans in New Zealand, the choice between the Foreign Earned Income Exclusion and the Foreign Tax Credit depends heavily on income level and bracket, more so than in countries where the local rate is clearly higher or lower than the US rate across the board. New Zealand's progressive rates can run above or below the comparable US federal rate depending on where the income falls, so the stronger tool can change from year to year.
The Foreign Tax Credit on Form 1116 tends to perform best for higher earners, where New Zealand tax on the same income equals or exceeds the US liability, since the credit is computed by category under IRC §§901 and 904 and any unused credit carries back one year and forward ten years on Schedule B of Form 1116. The Foreign Earned Income Exclusion on Form 2555 excludes foreign earned income up to an annually indexed maximum, for example $130,000 for 2025, under IRC §911, which can be the simpler and more effective choice for income under that cap or in a year where New Zealand tax runs lower than the comparable US tax. The FEIE does nothing for self-employment tax, can disqualify the refundable Additional Child Tax Credit for a family claiming it, and generally cannot be re-elected for five years once revoked without IRS consent. Our FEIE versus Foreign Tax Credit comparison walks through the decision in more detail, and the two elections can be combined across different income types within the same year.
What Does the US-New Zealand Tax Treaty Do for Double Taxation?
The United States and New Zealand have had a comprehensive income tax treaty in force since 1983, later updated by a protocol, but for most Americans on the ground in New Zealand the treaty is not where the day-to-day double-tax relief comes from. Like nearly every US treaty, it contains a saving clause that lets the United States tax its own citizens and green card holders largely as if the treaty did not exist, so the domestic Foreign Tax Credit and Foreign Earned Income Exclusion mechanisms described above do most of the actual work of avoiding double taxation on wages.
Where the treaty matters most is in the details: tie-breaker rules for residency when someone could be considered a resident of both countries in the same year, reduced withholding on certain investment income, rules for business profits, and specific provisions touching pensions and government service that can differ from the general rule. Because treaty provisions have to be read in their specific text, any position relying on a specific treaty article beyond the general saving-clause framework should be reviewed against the actual treaty language before you file.
Does the US-New Zealand Totalization Agreement Cover Social Security?
No. Unlike many of the countries where Americans commonly relocate, the United States and New Zealand do not have a totalization agreement in force, so there is no treaty-level mechanism to prevent a worker from potentially being subject to both countries' social security style systems on the same earnings. This matters most for self-employed Americans in New Zealand, since US self-employment tax under the general rule can still apply to net self-employment earnings even while New Zealand's own contributions are also being paid.
Because there is no certificate of coverage process available between the two countries, an American working in New Zealand, especially someone self-employed, should not treat the absence of a totalization agreement as a minor detail. Our guide to totalization agreements and self-employment tax abroad explains how the certificate of coverage process works where an agreement exists, and by contrast, why US self-employment tax needs to be evaluated directly for anyone self-employed in New Zealand.
How Are KiwiSaver and New Zealand Pensions Taxed by the US?
Not automatically. KiwiSaver, New Zealand's voluntary workplace retirement savings scheme funded by employee contributions, employer contributions, and government incentives, is tax-favored under New Zealand law, but that does not by itself make it tax-deferred for US purposes. The same is true of other New Zealand superannuation and retirement arrangements.
The general US rule, under the operation of IRC §§401(a) and 402(b), is that income accruing inside a foreign retirement plan is taxed currently to a US person unless a specific treaty provision defers it. Whether the US-New Zealand treaty defers tax on KiwiSaver or another New Zealand account is fact-specific and has to be analyzed against the actual treaty text, rather than assumed. Because the analysis is the same regardless of which country the plan is in, our foreign pension US tax treatment guide walks through the four questions that determine the answer for any foreign plan: whether growth is taxed as it accrues, whether a treaty defers it, what has to be reported, and how distributions are taxed.
Are New Zealand Investment Funds and PIEs Taxed as PFICs?
Usually, yes, and this is one of the more expensive surprises for Americans investing through a New Zealand bank or fund manager. A New Zealand managed fund, unit trust, or portfolio investment entity, commonly called a PIE, typically meets the definition of a passive foreign investment company under IRC Section 1297, with Sections 1291 and 1298 governing the tax treatment, regardless of how favorably that same fund is taxed under New Zealand's own PIE rules.
New Zealand also runs its own anti-deferral regime, the foreign investment fund rules, applying to a resident's investments held outside the country. A US citizen in New Zealand can therefore face two anti-deferral systems at once, US PFIC rules on non-US funds and New Zealand's FIF rules on foreign holdings, which makes investment structuring genuinely delicate. Once a fund is a PFIC, the default US tax treatment is punitive: absent a timely election, gains and certain distributions are spread over the holding period, taxed at the highest rate in effect for each of those years, and hit with an interest charge on top. Each PFIC generally requires its own Form 8621 filing, and the obligation applies even in a year where no tax is actually due, which is why Americans in New Zealand are usually steered toward US-domiciled brokerage accounts for new investing rather than a New Zealand PIE.
What Else Do You Have to Report to the IRS?
Beyond the income tax return itself, New Zealand financial accounts and investments carry their own separate information-reporting obligations that apply whether or not any US tax is owed. These filings are enforced on their own terms, and the penalties for missing them are typically far larger than any tax that would have been due.
The New Zealand Reporting Stack
Reference- FBAR (FinCEN Form 114). Required when the combined balance of your New Zealand bank, KiwiSaver, and brokerage accounts exceeds $10,000 at any point during the year. See our FBAR filing guide.
- Form 8938 (FATCA, IRC §6038D). A separate filing threshold, higher for Americans living abroad, that can require you to list the same New Zealand accounts directly on your federal tax return. See our Form 8938 guide.
- Form 8621 (PFIC). Generally required for each New Zealand managed fund, unit trust, or PIE that qualifies as a passive foreign investment company. See our PFIC and Form 8621 guide.
Whether you even count as a US tax resident in the first place, if your situation is more complicated than straightforward citizenship, such as a long stay in New Zealand on a visa before a move became permanent, is a separate question governed by the substantial presence test.
Bottom Line
Living in New Zealand does not simplify your US tax picture, it adds a second filing system on top of it. Inland Revenue and the IRS operate independently, and the tools that prevent double taxation, primarily a bracket comparison between the Foreign Tax Credit and the FEIE, along with the treaty's narrower provisions, have to be applied deliberately since New Zealand offers no totalization agreement to fall back on for social security. KiwiSaver, New Zealand investment funds, and foreign accounts each carry their own reporting rules, and getting any one of them wrong tends to cost more in penalties than the underlying tax ever would have.
Have questions about US expat taxes in New Zealand? Contact TS CPA for a free consultation. We respond within the same day.
Official IRS and Government Sources
- IRS, Foreign Earned Income Exclusion
- IRS, Foreign Tax Credit
- IRS, US Citizens and Resident Aliens Abroad
- IRS, United States Income Tax Treaties A to Z
- Social Security Administration, Totalization Agreements
- FinCEN, Report of Foreign Bank and Financial Accounts (FBAR)
- IRS, About Form 8621
- IRC Section 911, Citizens or Residents Living Abroad