Moving to the United States is an exciting milestone, but it also comes with a new set of tax obligations that many immigrants never expect. One of the most overlooked—and potentially costly—issues involves foreign mutual funds and exchange-traded funds (ETFs). Many individuals who relocate to the U.S. continue to hold investment funds purchased in their home countries, assuming that because they have already reported the accounts on an FBAR or Form 8938, they have fully complied with U.S. tax laws. Unfortunately, that assumption can be incorrect.
Many foreign mutual funds are treated as Passive Foreign Investment Companies (PFICs) under U.S. tax law. Owning a PFIC can trigger one of the most complex tax reporting regimes administered by the Internal Revenue Service (IRS), requiring the filing of Form 8621 and potentially resulting in significant tax and interest charges.
This article explains what a PFIC is, who should be concerned, why these investments receive special tax treatment, and what steps you should take if you believe you own one.
What Is a PFIC?
PFIC stands for Passive Foreign Investment Company. Congress introduced the PFIC rules as part of the Tax Reform Act of 1986 to discourage U.S. taxpayers from deferring U.S. taxes by investing through foreign investment companies.
Generally speaking, a foreign corporation is classified as a PFIC if it satisfies either of two tests under the Internal Revenue Code:
- At least 75% of its gross income is passive income, or
- At least 50% of its assets produce or are held to produce passive income.
Because mutual funds and ETFs primarily invest in stocks, bonds, and other securities rather than operating an active business, they frequently satisfy these tests. As a result, most foreign mutual funds and many foreign ETFs are likely to be treated as PFICs for U.S. tax purposes.
Many Investors Never Realize They Own a PFIC
One of the reasons PFICs create so many compliance issues is that the investments themselves appear perfectly ordinary.
An investor may purchase a diversified index fund in Japan, Ireland, Luxembourg, or another country long before moving to the United States. The fund may invest in familiar companies such as Apple, Microsoft, Toyota, or Nestlé. Nothing about the investment appears unusual.
However, from the IRS's perspective, what matters is where the investment fund itself is organized, not necessarily what it owns.
For example, many popular European UCITS funds domiciled in Ireland or Luxembourg are generally considered foreign corporations. Likewise, many mutual funds sold in Japan are organized as foreign investment companies. Once the investor becomes subject to U.S. taxation, these investments often fall under the PFIC rules.
Who Should Be Concerned?
Many people mistakenly believe PFIC rules apply only to U.S. citizens. In reality, a much broader group may be affected.
You should consider reviewing your investments if you are:
- A U.S. citizen who owns foreign mutual funds or foreign ETFs.
- A Green Card holder who purchased investment funds before immigrating to the United States.
- An individual who becomes a U.S. tax resident under the substantial presence test.
- Someone who inherited foreign mutual funds.
- Someone who received foreign mutual funds as a gift from family members overseas.
Many immigrants continue investing in familiar funds from their home countries without realizing that the U.S. tax treatment is dramatically different from what they experienced before moving.
Reporting the Account Is Not Enough
One of the most common misconceptions involves FBAR and Form 8938 reporting.
Many taxpayers correctly disclose their foreign investment accounts on:
- FinCEN Form 114 (FBAR), and
- IRS Form 8938 (Statement of Specified Foreign Financial Assets).
They often believe that these filings satisfy all U.S. reporting obligations.
Unfortunately, they may still be required to file Form 8621, which specifically reports ownership of PFICs.
In other words, reporting the account itself does not automatically satisfy the separate PFIC reporting requirements. This misunderstanding frequently leads taxpayers to discover years later that they have omitted multiple Forms 8621.
A Typical Real-Life Example
Consider the following scenario.
An individual moved to the United States in 2020 and later became a Green Card holder in 2024. Before immigrating, the individual had invested in several foreign ETFs domiciled in Ireland and Luxembourg.
Being diligent, the individual properly reported the investment accounts on both FBARs and Form 8938 every year.
However, the individual had never heard of PFICs.
As a result:
- Form 8621 was never filed.
- The taxpayer had no idea whether additional tax was due.
- Years of potential reporting obligations accumulated.
This situation is far more common than many people realize, particularly among immigrants who maintained investments established before relocating to the United States.
Why Are PFIC Rules So Complex?
The PFIC regime contains a unique method of calculating taxes that differs significantly from the normal taxation of investment income.
Under the default rules applicable to many PFICs, certain distributions and gains are treated as excess distributions. Rather than simply taxing those amounts in the current year, the law generally requires the income to be allocated across prior years of ownership.
The allocated portions are then generally subject to:
- the highest applicable ordinary income tax rate for each allocated year, and
- an interest charge intended to eliminate the benefit of tax deferral.
As a result, selling a PFIC after holding it for many years may produce a much larger U.S. tax liability than many investors expect.
Why Professional Calculations Are Usually Necessary
Unlike many ordinary investment calculations, PFIC computations often require detailed historical information.
Professionals may need:
- the complete purchase history,
- every acquisition date,
- the number of shares purchased,
- every sale,
- all dividend distributions,
- reinvestments,
- and other transaction details dating back to the original investment.
The calculations frequently must track individual purchase lots because different blocks of shares may have different holding periods and different tax consequences.
When multiple purchases and sales occur over many years, the calculations become increasingly complex. Specialized software and carefully designed calculation models are commonly used to perform these analyses accurately.
Can You Identify a Potential PFIC?
Although determining PFIC status requires legal and tax analysis, one practical screening tool is the fund's ISIN (International Securities Identification Number).
If the ISIN begins with a foreign country code—such as:
- IE (Ireland)
- LU (Luxembourg)
- JP (Japan)
- GB (United Kingdom)
- FR (France)
the investment may be a foreign fund that should be reviewed for potential PFIC status.
An ISIN alone does not determine whether an investment is a PFIC, but it can provide an important clue that additional review is appropriate.
What Should You Do If You Own Foreign Mutual Funds?
If you believe you may own PFICs, do not panic. Many taxpayers discover these rules years after becoming U.S. taxpayers.
Instead, consider taking the following steps:
- Gather your historical investment records from the original purchase date.
- Identify all purchases, sales, dividends, and reinvestments.
- Have the investments reviewed by a qualified international tax professional familiar with PFIC rules.
- Determine whether Forms 8621 should have been filed.
- Evaluate whether amended tax returns or an IRS compliance program, such as the Streamlined Filing Compliance Procedures (if you qualify), may be appropriate.
The earlier the issue is addressed, the more options may be available for correcting past filings.
Final Thoughts
Foreign mutual funds are among the most frequently overlooked issues in U.S. international tax compliance. Many taxpayers properly disclose their foreign financial accounts yet remain unaware that a separate PFIC reporting regime exists.
If you have lived overseas, inherited foreign investments, or moved to the United States while continuing to hold investment funds from your home country, it is worth reviewing your portfolio before assuming you are fully compliant. A timely review today may prevent significant tax complications and expensive corrections in the future.
Disclaimer
This article is provided solely for general educational and informational purposes and should not be construed as legal, tax, or accounting advice. The PFIC rules are among the most complex areas of the U.S. Internal Revenue Code, and their application depends on the specific facts and circumstances of each taxpayer and each investment. Reading this article does not create an attorney-client or CPA-client relationship with CHI Border Inc. or Fujimoto Law Corp., P.C. Before making any tax or financial decisions or taking action regarding foreign mutual funds, PFIC reporting, Form 8621, or any IRS compliance matter, you should consult with a qualified U.S. international tax professional who can evaluate your individual situation.