International ETFs for US investors: why fund domicile matters

In depth8 min read · updated 2 November 2026 · 8 sources

Most of the world's stock market value lies outside the United States, yet most American portfolios barely hold it. Adding international ETFs for US investors is simple, as long as the fund itself is based in the US. Foreign funds, such as the UCITS ETFs that Europeans buy, fall under the rules for passive foreign investment companies (PFICs) and can cost far more in tax than the investment ever earns. This article explains the difference, the foreign tax credit and where international funds belong.

Why hold international stocks at all

Investors everywhere overweight their home market. In the estimates of French and Poterba (1991), 94% of the stock holdings of US investors were domestic, 98% for Japanese and 82% for British investors. To justify such portfolios, investors would have to expect their own market to beat the others by several hundred basis points a year. The authors conclude that the lack of diversification comes from investor choices, not from legal barriers. Coval and Moskowitz (1999) found the same tendency even within the US: fund managers prefer companies headquartered nearby.

A global portfolio spreads the risk of a single country, currency and sector mix. How large the international share should be is a question of its own, covered in home bias and the global portfolio. This article is about the vehicle: which fund to use and what it means for your taxes.

The simple route: US-domiciled international ETFs

Funds registered in the United States that hold foreign stocks, such as total international, developed markets or emerging markets ETFs, are taxed like any other US fund. Dividends are paid out at least once a year, capital gains are taxed when you sell, and the usual capital gains tax rules apply. Part of the dividends can count as qualified dividends, depending on the countries and companies involved.

Foreign governments often withhold tax on dividends before the money reaches the fund. A US fund can pass these foreign taxes through to its shareholders, who then claim them as a credit on their own return (IRS Publication 514 2025). If your only foreign income is passive income such as fund dividends, reported on a form like the 1099-DIV, and the foreign taxes are no more than $300 ($600 on a joint return), you can claim the credit without filing Form 1116 (IRS, foreign tax credit 2026).

The trap: foreign funds are PFICs

A foreign corporation is a passive foreign investment company if at least 75% of its gross income is passive income or at least 50% of its assets produce passive income (IRS, Form 8621 2025). A fund based in Ireland or Luxembourg that holds stocks or bonds meets these tests almost by definition. For a US taxpayer, that applies to UCITS ETFs, foreign mutual funds and many foreign pension and insurance wrappers.

Without an election, the default regime for gains and so-called excess distributions is harsh. The gain on a sale is spread evenly over the years you held the fund. The share allocated to the current year is taxed as ordinary income. The shares allocated to earlier years are taxed at the highest income tax rate in effect for each of those years, and an interest charge is added, as if you had paid the tax late (IRS, Form 8621 2025). The favorable long-term capital gains rates never apply.

Two elections can soften the rules. With a qualified electing fund (QEF) election, you include your share of the fund's earnings each year, ordinary income as ordinary income and net capital gain as long-term gain, whether or not anything is paid out. That requires annual information from the fund, which most foreign ETFs do not provide. With the mark-to-market election, available for listed shares, you report each year's increase in value as ordinary income (IRS, Form 8621 2025). Either way, each PFIC needs its own Form 8621, and the paperwork alone is a reason to avoid them.

Americans living abroad

The problem is most common among US citizens and green card holders living in Europe or Asia. They remain subject to US tax on their worldwide income, and the funds their local bank offers are usually PFICs. Holding a few thousand dollars in such funds can still mean filing duties: a separate Form 8621 is due for each PFIC in certain years, and only small holdings of up to $25,000 ($50,000 on a joint return) without distributions or sales are exempt from part of the form (IRS, Form 8621 2025).

The usual way out is to hold US-domiciled ETFs through a broker that accepts clients abroad, or individual stocks, which are not PFICs. European rules work in the opposite direction: retail investors in the EU often cannot buy US-domiciled ETFs because these do not publish the key information document that EU law requires (AMF, Ombudsman 2023). Americans abroad should check with a tax professional who knows both countries before they invest.

Withholding taxes and where to hold international funds

Where a fund is based also determines how much foreign withholding tax it pays. For European investors, US stock ETFs based in Ireland pay 15% withholding tax on US dividends thanks to the tax treaty, while funds from Luxembourg and other countries pay 30% (Crowley 2023). For US investors in US-domiciled international funds, the foreign taxes withheld abroad flow through as a credit, as described above.

That credit only helps in a taxable account. Inside an IRA or 401(k) there is no tax to credit the foreign taxes against, so they are simply a cost. This is one reason some investors place international funds in the taxable account and bonds in the tax-advantaged accounts, an example of asset location. Dammon et al. (2004) show how to combine taxable and tax-deferred accounts in general; for an individual portfolio, the size of the foreign tax credit has to be weighed against the other assets that compete for space in the IRA.

Currency risk

International stock funds for US investors are usually unhedged: their value in dollars moves with both the foreign stock prices and the exchange rates. Over long horizons, currency moves tend to matter less for stocks than for bonds, which is why many international bond funds hedge their currency exposure while stock funds often do not. The trade-offs are covered in currency risk.

Common mistakes

• Buying a UCITS ETF because it is cheaper or accumulating: for a US taxpayer, the PFIC rules usually wipe out any cost advantage many times over.
• Assuming small amounts do not matter: even a small holding can require a Form 8621 in a year with a distribution or a sale, and the tax regime applies regardless of size.
• Forgetting the foreign tax credit: foreign taxes shown on the 1099-DIV are a credit, not just a deduction, if you claim them.
• Holding international funds only in an IRA without thinking about it: the foreign withholding tax is then a permanent cost.
• Ignoring the home bias: a portfolio of only US stocks is a bet on one country, even if it has been a good bet for decades.

This article explains general federal tax rules and is not tax advice. PFIC rules are complex and depend on your situation; if you hold or plan to hold foreign funds, ask a tax professional.

This article explains a method; it is not investment or tax advice. Worked examples are simplified and rounded. All terms in the glossary.