Is Your KiwiSaver a PFIC? A Worked Example of the US Tax on a $40,000 Balanced Fund
If you are a US citizen or green-card holder living in New Zealand, your KiwiSaver default or balanced fund is almost certainly a Passive Foreign Investment Company (PFIC) in the eyes of the IRS — a pooled, non-US managed fund. That means a separate Form 8621 for each underlying fund, US tax on contributions New Zealand never let you deduct, and — critically — no relief from New Zealand's FIF de minimis rule. This is a worked example of exactly how that plays out on a $40,000 balance.
Why a KiwiSaver fund is almost always a PFIC
The US tax code defines a PFIC by looking at the wrapper — the fund itself — not at what the fund happens to own. A foreign corporation is a PFIC if either (1) 75% or more of its gross income is passive (dividends, interest, capital gains), or (2) 50% or more of its assets produce, or are held to produce, passive income. That is the Section 1297 definition the IRS publishes in the Form 8621 instructions.
A KiwiSaver default fund or balanced fund is a pooled vehicle that holds shares, bonds and cash on your behalf. Almost 100% of its income is passive. It is organised under New Zealand law, not US law. That is the textbook fact pattern of a PFIC. The same is true of nearly every New Zealand managed fund, PIE fund, and locally domiciled ETF. The fact that the underlying assets might include a slice of US shares does not save you — the IRS looks at the New Zealand fund you hold a unit in, and that fund is foreign and passive.
Investing in a low-cost, diversified, perfectly sensible New Zealand retirement fund is, from the US side, investing in a foreign passive investment company — and the US penalises exactly that.
What "PFIC" actually triggers
Once a holding is a PFIC, you have three possible tax regimes, and the one that applies by default is the harshest:
| Regime | How it taxes you | Catch for KiwiSaver holders |
|---|---|---|
| §1291 — excess distribution (default) | "Excess" distributions and all gains on sale are spread back over your holding period, taxed at the highest ordinary rate for each prior year, plus a compounding interest charge. | This is what applies if you do nothing. The interest charge can make the effective tax brutal on a long-held fund. |
| §1296 — mark-to-market | You pay US ordinary-income tax each year on the fund's unrealised gain (rise in value), even though you sold nothing. | Only allowed for "marketable stock" regularly traded on a recognised exchange. Most KiwiSaver units are not marketable, so this election is usually unavailable. |
| §1295 — Qualified Electing Fund (QEF) | The cleanest regime: you pick up the fund's ordinary earnings and capital gains annually, at normal capital-gains treatment. | Requires a PFIC Annual Information Statement from the fund. New Zealand KiwiSaver providers essentially never produce one, so QEF is almost always off the table. |
For most KiwiSaver members, mark-to-market is unavailable (units aren't exchange-traded) and QEF is unavailable (no Annual Information Statement). That leaves the default §1291 regime — the worst of the three.
Worked example: Priya's $40,000 KiwiSaver across two funds
Priya is a US citizen who moved to Auckland in 2019 and has never renounced. She earns NZ$95,000. Her KiwiSaver balance is NZ$40,000, sitting in a provider's "Balanced" option that is itself built from two underlying pooled funds:
- Fund A — Growth (global shares): NZ$26,000 of her balance
- Fund B — Income (bonds & cash): NZ$14,000 of her balance
Step 1 — Count the PFICs. The IRS treats each separate pooled fund as its own PFIC. The Form 8621 instructions state plainly that "a separate Form 8621 must be filed for each PFIC in which stock is held directly or indirectly." Priya's single $40,000 KiwiSaver therefore generates two Form 8621 filings — one for Fund A, one for Fund B — even though her statement shows one "Balanced" line.
Step 2 — Check the §1298(f) filing exception. There is a small de-minimis filing exception: an unmarried filer with total PFIC stock worth NZD/USD $25,000 or less on the last day of the year ($50,000 on a joint return) can skip Part I — but only if they received no excess distribution and recognised no gain that year. Priya is single and her two funds together exceed $25,000, so the exception does not help her: she must complete Form 8621 in full for both funds.
Step 3 — Identify the default regime. Neither underlying fund is exchange-traded marketable stock, so §1296 mark-to-market is out. Her provider issues no PFIC Annual Information Statement, so §1295 QEF is out. Priya falls into the §1291 excess-distribution regime by default for both funds.
Step 4 — See where the §1291 pain lands. In a year she keeps the money invested and takes no withdrawal, §1291 may produce little or no current tax (there is no "excess distribution"). The bite comes when she sells, switches funds, or withdraws at retirement: the entire gain is spread back across every year she held it, taxed at the top ordinary rate for each of those years, plus a compounding interest charge. A fund held 20 years can see an effective rate well above what a straightforward capital gain would have cost. The longer she holds, the worse §1291 gets.
The headline lesson from Priya's case: a single, modest, sensible KiwiSaver balance becomes two annual US information returns, each carrying real compliance cost, and a latent tax liability that grows the longer she does the "right" thing and leaves it invested.
Trust or PFIC? The unresolved IRS position
Here is where even specialists disagree. There are two defensible — and conflicting — ways to characterise a KiwiSaver for US purposes:
View 1: KiwiSaver is an investment in a PFIC
You hold units in a pooled fund; the fund is a PFIC; you file Form 8621 per underlying fund. This is the most common practitioner approach for the default/balanced options described above.
View 2: KiwiSaver is a foreign grantor trust
Because a KiwiSaver scheme is a trust under New Zealand law and you are the beneficiary whose contributions fund it, a number of advisers treat it as a foreign grantor trust. That view triggers a different — and heavier — reporting stack: Form 3520 (transactions with a foreign trust) and Form 3520-A (the annual return of the foreign trust itself). The penalties for missing Form 3520/3520-A are severe.
The IRS has not issued definitive guidance on how KiwiSaver should be characterised, and the US–NZ treaty does not name it as a recognised pension the way some other treaties name foreign plans. The result is that reputable advisers reach different conclusions: some file Form 8621 only, some file Form 3520/3520-A, some file both to be safe. Whatever position you take should be consistent, documented, and chosen with a cross-border specialist — this is a genuine grey area, not a settled rule.
Employer and government contributions get taxed by the US — with no NZ offset
New Zealand's KiwiSaver design assumes three streams flow into your account: your own contributions, your employer's matching contribution, and the annual government contribution. From the US side, the latter two can be a nasty surprise.
Employer contributions. Inland Revenue confirms employers must match your contribution at the default rate — rising to 3.5% from 1 April 2026 and to 4% from 1 April 2028 for both employee and employer (IRD: KiwiSaver changes). The US generally does not treat a foreign employer's pension contributions the way it treats a US-qualified 401(k) employer match. Without treaty pension protection, those employer dollars can be currently taxable US income to you, even though you can't touch the money until retirement.
Government contributions. Inland Revenue states that from 1 July 2025 the government contributes 25 cents for each dollar you contribute each year, up to a maximum government contribution of $260.72; members earning more than $180,000 of taxable income a year no longer qualify (IRD: KiwiSaver changes). To the IRS, a government top-up paid into your account looks like income too.
The cruel part is the asymmetry: New Zealand gives you no income-tax deduction for your own KiwiSaver contributions (the system is designed around the employer match and the government top-up, not a contributions deduction). So you get neither a US deduction nor an NZ deduction going in, while the US may tax the employer and government money as it lands. You are taxed on dollars you did not personally earn and cannot yet spend.
| Money into your KiwiSaver | NZ income-tax deduction? | US treatment (no treaty pension protection) |
|---|---|---|
| Your own contribution | No | Paid from already-taxed income |
| Employer match (3.5% from 1 Apr 2026) | No deduction to you | Can be currently taxable US income |
| Government contribution (max $260.72/yr) | n/a | Can be currently taxable US income |
The cruellest twist: the NZ $50,000 FIF exemption gives you zero US relief
New Zealand has its own anti-deferral rules for offshore holdings: the Foreign Investment Fund (FIF) regime. For natural persons there is a de minimis exemption — if the total cost of your attributing FIF interests is under NZ$50,000, you don't have to calculate FIF income at all (IRD: FIF rules exemptions). The threshold is based on what you originally paid in NZD, not current market value. (Budget 2026, delivered 28 May 2026, proposes raising this to NZ$100,000 — but that change is not yet legislated and remains subject to the parliamentary process; treat $50,000 as the live figure until it passes.)
The $50,000 de minimis is a New Zealand rule that switches off a New Zealand tax calculation. The IRS does not recognise it, does not mirror it, and has no equivalent dollar shield for small PFIC holdings beyond the narrow §1298(f) filing exception (which only saves paperwork in the year you take nothing out, not tax). So a US citizen whose KiwiSaver sits comfortably under NZ$50,000 of cost — and who therefore owes New Zealand nothing under FIF — still owes the US a full Form 8621 per underlying fund and is still inside the §1291 regime. The relief is a one-way mirror: New Zealand lets the small holder off; the US does not.
This is exactly why the FIF/PFIC overlap is a double-bind rather than a single problem. Many New Zealand investors structure their portfolios precisely to stay under the FIF threshold. A US person who does the same gets none of the protection on the US side — and worse, the very fact of being a foreign pooled fund is what creates the US exposure in the first place.
- A KiwiSaver default or balanced fund is almost always a PFIC for the IRS, because the test looks at the foreign pooled fund itself, not its underlying assets.
- Each underlying pooled fund is a separate PFIC — a single $40,000 balanced KiwiSaver can mean two or more Form 8621 filings.
- Mark-to-market (§1296) usually fails because units aren't exchange-traded; QEF (§1295) usually fails because providers issue no Annual Information Statement — leaving the punitive default §1291 regime.
- Whether KiwiSaver is a PFIC investment or a foreign grantor trust (Form 3520/3520-A) is an unresolved IRS question; pick a documented, consistent position with a specialist.
- Employer (3.5% from 1 Apr 2026) and government (max $260.72/yr) contributions can be currently taxable US income, with no NZ contributions deduction to offset them.
- The NZ $50,000 FIF de minimis gives zero US relief — it's a New Zealand switch the IRS ignores.
Is my KiwiSaver definitely a PFIC, or only some of them?
A KiwiSaver default, conservative, balanced or growth fund is a pooled, foreign-domiciled vehicle that earns almost entirely passive income — the classic PFIC fact pattern under Section 1297. It is very hard to construct a mainstream KiwiSaver option that is not a PFIC. A cross-border specialist should confirm the characterisation against your specific fund's holdings, but the default expectation is PFIC.
Why does one KiwiSaver account create more than one Form 8621?
Because the IRS treats each separate pooled fund you hold an interest in as its own PFIC, and the Form 8621 instructions require a separate form for each PFIC. A "Balanced" option built from a growth fund and an income fund is, to the IRS, an interest in two PFICs — two Form 8621 filings.
Doesn't the US–NZ tax treaty protect my KiwiSaver like a 401(k)?
Not cleanly. Unlike some treaties that name specific foreign pension plans, the US–NZ treaty does not clearly designate KiwiSaver as a protected pension, and the IRS has issued no definitive guidance. That uncertainty is precisely why advisers disagree on whether to file Form 8621, Form 3520/3520-A, or both. Get a documented position from a specialist.
I'm under the NZ$50,000 FIF threshold — am I off the hook for the US too?
No. The NZ$50,000 de minimis is a New Zealand FIF rule that the IRS does not recognise. You can owe New Zealand nothing under FIF and still owe the US a full Form 8621 per underlying fund under the §1291 regime. The only US small-holding relief is the narrow §1298(f) filing exception ($25,000 single / $50,000 joint), and it only applies in a year you take no distribution and recognise no gain.
Are my employer and government KiwiSaver contributions taxable in the US?
Without treaty pension protection, the US can treat foreign employer pension contributions and government top-ups as currently taxable income, even though the money is locked up. New Zealand gives you no contributions deduction either, so you can be taxed on dollars you neither earned personally nor can access yet. This is one of the harshest parts of the overlap.
Can I just make a QEF or mark-to-market election to avoid §1291?
Usually not for KiwiSaver. QEF (§1295) needs a PFIC Annual Information Statement that NZ providers don't issue, and mark-to-market (§1296) needs the units to be regularly traded marketable stock, which most KiwiSaver units are not. That typically leaves the punitive default §1291 regime. A specialist may still find planning options around timing of disposals and overall structure.
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