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The United States adopts a citizenship-based taxation system, meaning that U.S. taxpayers including U.S. citizens, green card holders, and resident aliens must report and potentially pay tax on their worldwide income, regardless of where they live or where their assets are located. When these taxpayers control foreign entities such as corporations, partnerships, or investment vehicles, they enter a highly regulated domain that includes complex tax consequences and detailed disclosure obligations. Two key foreign entity classifications relevant to this area are Controlled Foreign Corporations (CFCs) and Passive Foreign Investment Companies (PFICs).
A Controlled Foreign Corporation (CFC) is a foreign corporation in which more than 50% of the total combined voting power or value is owned by U.S. shareholders. A “U.S. shareholder” is defined as a U.S. person who owns at least 10% of the voting power or value of the foreign corporation. When a U.S. taxpayer controls a CFC, the U.S. tax system requires them to report and sometimes pay tax on the corporation’s income even if no distributions are made. This is primarily governed by Subpart F of the Internal Revenue Code (IRC), which forces the current inclusion of certain passive or easily shiftable income types such as dividends, interest, rents, royalties, and related-party sales and services.
In 2017, the Tax Cuts and Jobs Act (TCJA) introduced an additional inclusion regime for CFCs called Global Intangible Low-Taxed Income (GILTI). GILTI operates as a minimum tax mechanism and requires U.S. taxpayers to currently include in their gross income an amount roughly equal to the earnings of a CFC that exceed a fixed return (10%) on the CFC’s qualified business assets. This prevents the deferral of income earned in low-tax jurisdictions, targeting intangible income like software licenses, intellectual property, or brand royalties.
Separately, even if a foreign corporation is not a CFC or does not meet the thresholds for Subpart F or GILTI, a U.S. taxpayer might still be subject to special rules under the Passive Foreign Investment Company (PFIC) regime. A PFIC is any foreign corporation that meets either of the following two tests: 1. 75% or more of its gross income is passive (such as interest, dividends, or capital gains), or 2. at least 50% of its assets produce passive income. This often includes foreign mutual funds, ETFs, or foreign holding companies. PFIC rules are intentionally harsh: they penalize U.S. taxpayers who receive distributions or sell PFIC shares by applying interest charges on tax deferrals and subjecting the gains to the highest marginal rate retroactively.
To mitigate the PFIC consequences, a U.S. taxpayer can elect certain treatments—such as the Qualified Electing Fund (QEF) or Mark-to-Market (MTM) election. However, these elections come with strict requirements, and QEF elections in particular may require the foreign entity to furnish detailed financial information, which is not always possible or practical.
Regardless of whether a foreign entity is a CFC, PFIC, or a partnership, U.S. taxpayers face an extensive set of reporting obligations. These include:
- Form 5471 for U.S. persons with certain interests in foreign corporations (including CFCs),
- Form 8865 for those involved in foreign partnerships,
- Form 8621 for each PFIC investment, even when there is no income or gain,
- Form 8938 (under FATCA) to report specified foreign financial assets,
- FinCEN Form 114 (FBAR) to report foreign financial accounts if the aggregate value exceeds $10,000 at any time during the year.
Failure to file these forms can result in significant penalties, often ranging from $10,000 per form per year, and can also suspend the statute of limitations on the taxpayer’s entire tax return.
In conclusion, when a U.S. taxpayer including a green card holder controls or holds a significant interest in a foreign entity, they are subject to a detailed and overlapping set of tax and disclosure rules. The aim is to ensure that foreign income, especially passive income or profits housed in low-tax jurisdictions, is not shielded from the U.S. tax system. While CFC rules target the deferral of earnings through corporate control, PFIC rules are designed to capture offshore passive investment income. Given the complexity and potential consequences, U.S. taxpayers with foreign holdings should seek specialized international tax advice to ensure full compliance and optimal tax treatment.
References
UNITED STATES INTERNAL REVENUE SERVICE. Instructions for Form 5471 – Information Return of U.S. Persons With Respect to Certain Foreign Corporations. Available at: Click here . Accessed on: July 29, 2025.
UNITED STATES INTERNAL REVENUE SERVICE. Instructions for Form 8865 – Return of U.S. Persons With Respect to Certain Foreign Partnerships. Available at: Click here . Accessed on: July 29, 2025.
UNITED STATES INTERNAL REVENUE SERVICE. Instructions for Form 8621 – Information Return by a Shareholder of a Passive Foreign Investment Company or Qualified Electing Fund. Available at: Click here . Accessed on: July 29, 2025.
UNITED STATES INTERNAL REVENUE SERVICE. Instructions for Form 8938 – Statement of Specified Foreign Financial Assets. Available at: Click here. Accessed on: July 29, 2025.
FINANCIAL CRIMES ENFORCEMENT NETWORK (FinCEN). Report of Foreign Bank and Financial Accounts (FBAR). Available at: Click here. Accessed on: July 29, 2025.
U.S. CODE. Title 26 – Internal Revenue Code.
KLEIN, William A.; BANKMAN, Joseph; SHAVIRO, Daniel. U.S. International Taxation. 2nd ed. New York: Aspen Publishers, 2020.
