A Note on Recent Legislation
The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025 as Public Law 119-21, modified certain international tax provisions affecting CFC shareholders, including changes affecting the Section 250 deduction applicable to GILTI income. This guide reflects current law as amended where confirmed based on guidance from the Internal Revenue Service. Some provisions are still pending IRS implementation guidance, and specific rules may be clarified further as that guidance is issued.
The CFC rules exist to prevent US persons from deferring tax indefinitely by parking income in foreign corporations. If you are a US citizen or resident who owns or co-owns a foreign company, understanding whether that company qualifies as a CFC is one of the most important questions in your international tax profile.
This guide is for US citizens living abroad, foreign founders with US co-owners, and anyone who owns a stake in a non-US corporation.
CFC in One Sentence
A Controlled Foreign Corporation is a foreign company majority-controlled by US shareholders, where that control triggers current US taxation on certain income and mandatory annual reporting to the IRS regardless of whether any earnings were distributed.
1. What Is a CFC and How Is It Defined Under US Tax Law?
Under IRC Section 957, a foreign corporation becomes a CFC when US shareholders collectively own more than 50% of the total combined voting power or the total value of its stock at any point during the tax year. A US shareholder, for this purpose, is any US person who owns at least 10% of the voting power or value in that foreign corporation.
The 50% test is not about any single owner crossing a threshold. It is about whether the group of qualifying US shareholders, those who each own at least 10%, collectively reaches 50%. A foreign corporation owned 60% by Americans each holding 10% or more is a CFC. One owned 60% by Americans who each hold only 3% is not, because none of them qualifies as a US shareholder under the 10% threshold.
This is one of the most misunderstood aspects of CFC classification under US CFC tax rules. The analysis requires you to evaluate both the individual ownership test and the aggregate control test separately before reaching a conclusion.
2. How Do Attribution and Constructive Ownership Rules Work?
The CFC ownership analysis does not stop at direct holdings. The IRS applies attribution and constructive ownership rules that can assign you ownership of shares held by your spouse, children, parents, and certain related entities. You may qualify as a US shareholder, or tip a corporation into CFC status, entirely through shares you do not directly own.
Consider this scenario: a US founder owns 40% of a foreign company, their spouse owns 15%, and a trust they control owns 10%. Under constructive ownership rules, the IRS treats the founder as owning 65%. The company is a CFC because US persons collectively own more than 50%, and the founder personally crosses the 10% US shareholder threshold through attributed ownership.
For founders structuring international businesses with US co-owners or family members, the attribution rules create exposure that a clean-looking cap table will not reveal. Map the full ownership picture, including indirect and attributed holdings, before concluding that CFC status does not apply.
3. What Income Is Taxable Under CFC Rules?
Under Subpart F of the Internal Revenue Code, US shareholders of a CFC must include certain categories of the CFC's income in their own taxable income in the year it is earned, even if no distribution was made. This is the anti-deferral principle at the core of the CFC regime. In practice, many US shareholders do not realize they have a current tax liability until the problem has compounded across multiple years.
Two limiting rules apply. The de minimis rule exempts all Subpart F income if the total falls below the lesser of 5% of the CFC's gross income or $1 million. The high-tax exception excludes Subpart F income subject to an effective foreign tax rate above 18.9%, which is 90% of the current US corporate rate. Active business income that falls outside these categories is generally not currently taxable under Subpart F, though GILTI may still apply as covered in the next section.
4. What Is GILTI and How Does It Affect CFC Owners?
Beyond Subpart F, the Tax Cuts and Jobs Act of 2017 introduced the Global Intangible Low-Taxed Income (GILTI) regime under IRC Section 951A. GILTI requires US shareholders of CFCs to include in their gross income their share of the CFC's net income that exceeds 10% of the CFC's qualified business asset investment (QBAI), which is the adjusted basis of tangible depreciable property used in the business.
In practical terms, GILTI functions as a minimum tax on foreign earnings. This often comes up alongside entity classification and cross-border structuring decisions, which our guide on how foreign-owned US entities are taxed covers in full. GILTI applies broadly to income not already captured by Subpart F and is designed to prevent US multinationals and individual shareholders from shifting intangible income, such as royalties and software profits, to low-tax jurisdictions without current US tax exposure.
The OBBBA (Public Law 119-21) modified certain GILTI provisions effective for tax years beginning on or after January 1, 2026, including changes affecting the Section 250 deduction rate. Specific mechanics remain subject to IRS implementation guidance.
5. What Is Form 5471 and Who Must File It?
US shareholders of CFCs are required to file Form 5471, the Information Return of US Persons with Respect to Certain Foreign Corporations, annually with their US tax return. It is not a tax payment mechanism. It discloses the CFC's income, balance sheet, transactions with related parties, and ownership structure to the IRS.
The filing obligation applies to different categories of filers based on their level of ownership and control. Whether you are an officer, director, or shareholder, and at what percentage, determines which version of the form you file and which schedules are required.
The penalty for failing to file is $10,000 per form per year, even if no tax was owed and even if the failure was non-willful. After IRS notification, an additional $10,000 penalty applies for every 30-day period of continued failure, up to $50,000 per form. If you own stakes in three foreign corporations and miss a single year, your starting penalty exposure is $30,000 before any continuation penalties apply. If you are working through what staying compliant looks like year over year, our Compliance 101 guide is a useful starting point.
6. How Does the Previously Taxed Earnings and Profits (PTEP) Rule Work?
When a US shareholder includes Subpart F income or GILTI in their taxable income in a given year, that income is recorded as previously taxed. When the CFC later distributes those earnings as a dividend, the shareholder generally does not pay US tax on the distribution again. This prevents double taxation within the CFC system.
The PTEP account tracks what has already been included so the same dollars are not taxed again when eventually distributed. Maintaining accurate PTEP accounts is a complex bookkeeping and compliance requirement. Errors in PTEP tracking can result in over-taxation on distributions or incorrect Form 5471 reporting. For founders who have operated CFCs for multiple years without proper compliance, reconstructing PTEP history is often the most time-consuming part of getting current, and it requires specialist bookkeeping that cannot be reverse-engineered from incomplete records.
7. What Is the Section 962 Election?
Individual US shareholders of CFCs face a structural disadvantage compared to US corporations. The table below shows how the treatment differs under current law:
The Section 962 election allows an individual US shareholder to elect to be taxed as if they were a domestic corporation for purposes of their CFC income inclusion. The election must be made annually, applies on a return-by-return basis, and requires careful analysis of the foreign tax rate and distribution mechanics.
This is one of the most valuable planning tools available to individual CFC owners and one that is frequently missed by advisors who do not specialize in international tax. The math depends on your CFC's effective foreign tax rate and your distribution timing, and the difference between electing and not electing can be significant.
8. CFC vs Foreign-Owned US Entity: What Is the Difference?
It is worth being clear about what the CFC rules are not. These are two different sets of rules operating in opposite directions, and conflating them is a common source of confusion.
A foreign founder who owns a US LLC is not subject to CFC rules on that entity. However, if that same founder also owns a foreign corporation that has US shareholders as co-owners, and those US shareholders meet the 10% threshold and collectively own more than 50%, that foreign corporation could be a CFC. The two structures can coexist within a single business and must be analyzed separately. The reporting obligations for foreign-owned US entities are covered in our Form 5472 filing guide.
9. Common CFC Mistakes and How to Avoid Them
The CFC rules are among the most technically complex in US tax law, and mistakes are common even among founders and advisors with international experience.
- Failing to recognize constructive ownership: Many founders assume that because they personally own less than 50%, CFC rules do not apply. Attribution rules can change that analysis entirely based on family or entity relationships.
- Missing the 10% US shareholder threshold: Not every US owner of a foreign corporation is a US shareholder for CFC purposes. The 10% minimum is a threshold, not just a label.
- Ignoring GILTI on active income: Some founders assume that active business income is never currently taxable. GILTI captures a broad category of income that goes well beyond the traditional Subpart F passive income categories.
- Not filing Form 5471: The absence of a distribution is not a reason to skip the filing. The reporting obligation exists regardless of whether any income was distributed or any tax was owed.
- Failing to track PTEP: Poor record-keeping on previously taxed earnings creates downstream problems when distributions are made, often resulting in double taxation that could have been avoided.
If you are unsure whether your residency status puts you in scope for these rules at all, our guide on US tax residency vs non-residency covers that threshold question first.
Do You Have a CFC? A Quick Test
A foreign corporation is likely a CFC if the following conditions are met:
- 10% threshold: Are you a US person who owns at least 10% of a foreign corporation? You may qualify as a US shareholder.
- 50% control test: Do US shareholders collectively own more than 50% of that foreign corporation? If yes, it is likely a CFC.
- Attribution rules: Do the attribution rules add shares you do not directly own to your total? Your effective ownership may be higher than your cap table shows.
- Income type: Did the foreign corporation earn passive income, royalties, or income from related-party transactions? Subpart F inclusion may apply.
- Filing status: Have you filed Form 5471 for every year you qualified? If not, penalties are accumulating regardless of whether any tax was owed.
If you answered yes to any of the first two questions, a CFC analysis is not optional. It is a compliance requirement.
This post is for general informational purposes only and does not constitute professional tax, legal, or accounting advice for your specific situation. Reading this post does not create a CPA-client relationship. Tax laws are complex and subject to change. If you would like advice tailored to your situation, consult a qualified tax professional, including through the services offered on this site.