New Zealand · US-citizen-in-NZ cross-border tax (FIF/PFIC, KiwiSaver, treaty)

The US tax double-bind on your New Zealand investments — finally worked out in real numbers.

Worked-example guides to the US-citizen-in-New-Zealand tax double-bind — FIF vs PFIC, KiwiSaver reporting, and the transitional-residence window.

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Written by Hannah Whitfield, CA (NZ–US cross-border tax) · figures verified against official New Zealand sources

21worked-example guides
3core topic clusters
Jun 2026figures verified & updated
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Where US tax meets the New Zealand investment system

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FIF & PFIC double-bind

Why every NZ managed fund and KiwiSaver is a PFIC — and how the FIF and PFIC regimes tax the same fund twice, two different ways, with full worked numbers.

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US compliance forms

FBAR, Form 8938, Form 3520, FATCA and streamlined catch-up — which NZ accounts trigger which form, with thresholds and worked dollar examples.

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Transitional planning & treaty

The 4-year transitional-residence window, the NZ–US tax treaty savings clause, foreign tax credits, pre-move planning and the renounce-vs-comply break-even.

All guides

Every worked example, by cluster

FIF & PFIC double-bind

Is Your KiwiSaver a PFIC? A Worked Example of the US Tax on a $40,000 Balanced FundThe FIF x PFIC Double-Bind: One NZ Managed Fund Taxed Twice, Two Different WaysFilling Out Form 8621 for a KiwiSaver Fund: A Line-by-Line Worked ExampleFDR vs Comparative Value: Which FIF Method Costs a US Expat Less (Worked Numbers)The NZD 50,000 FIF Threshold Trap for US Citizens: Exempt in NZ, Still Taxed by the IRSDo Individual NZX Shares Trigger PFIC? Air NZ vs a Smartshares ETF, ComparedEvery NZ Managed Fund Is a PFIC: What a $100,000 Portfolio Actually Costs at US Tax TimeIs KiwiSaver a Foreign Trust or a PFIC? Two IRS Theories and What Each Costs You

US compliance forms

FBAR for US Expats in NZ: Which Accounts Count and a $12,000 Aggregate Worked ExampleForm 3520 and KiwiSaver: When a US Expat in NZ Has to File the Trust FormsForm 8938 vs FBAR for US Expats in NZ: The $200,000 vs $10,000 Threshold Gap, With ExamplesStreamlined Foreign Offshore for US Expats in NZ: A 3-Year Catch-Up Worked ExampleFATCA in New Zealand: What the IGA Means When Your ANZ or Sharesies Account Asks for US StatusMapping Your NZ Income to a US 1040: Salary, PIE, and Rental in One Worked ExampleFBAR Penalties Explained for US Expats in NZ: Non-Willful vs Willful, With Real Dollar Figures

Transitional planning & treaty

The NZ 4-Year Transitional Residence Window for US Citizens: A Worked TimelinePre-Move Tax Planning for US Citizens Heading to NZ: 5 Moves Before You LandThe NZ-US Tax Treaty and the Savings Clause: What It Does and Doesn't Shelter (Worked Examples)Avoiding Double Tax NZ to US: A Foreign Tax Credit Worked Example on $95,000 SalaryRenouncing US Citizenship vs Staying Compliant in NZ: A Cost Comparison Over 10 YearsMoving to NZ as a US Citizen: Your First-Year Tax Obligations in One Worked Timeline

The US-expat-in-NZ tax checklist

One email: the forms a US citizen in New Zealand actually owes (FBAR, 8938, 8621, 3520), the KiwiSaver/PFIC traps, and the transitional-window moves — in plain English.