In U.S. tax law, a controlled foreign corporation (CFC) is a foreign company in which U.S. shareholders together own more than 50 percent of either the voting power or the total value of the stock. Once a foreign corporation meets that test, its U.S. owners have to pay U.S. tax on certain categories of the company’s income every year, whether or not the company sends them any cash. They also owe the IRS an annual information return about the company. That is the short version of the CFC meaning in tax, and the rest of this article walks through how each piece works.
How the CFC Test Actually Works
Two thresholds have to line up. First, you count only “U.S. shareholders,” and that phrase has a specific meaning: a U.S. person who owns at least 10 percent of the foreign corporation’s voting power or value, counting both direct ownership and ownership held indirectly through other foreign entities.1Office of the Law Revision Counsel. 26 U.S. Code 951 – Amounts Included in Gross Income of United States Shareholders Someone with a 5 percent stake is a U.S. investor, but not a U.S. shareholder for this purpose, and their stock is ignored when you tally up the 50 percent figure.
Second, you add up the stock held by everyone who does clear that 10 percent bar. If the total exceeds 50 percent of vote or value on any single day during the corporation’s tax year, the company is a CFC for that year.2Office of the Law Revision Counsel. 26 U.S. Code 957 – Controlled Foreign Corporations; United States Persons No one shareholder needs to hold a majority. Five unrelated Americans each holding 11 percent of a company incorporated abroad add up to 55 percent, and that is enough. One day is enough.
Ownership You Didn’t Know You Had
You can’t sidestep the 10 percent shareholder threshold by parking shares with family members. Stock held by your spouse, children, grandchildren, and parents is attributed to you under the constructive ownership rules.3eCFR. 26 CFR 1.958-2 – Constructive Ownership of Stock Own 6 percent yourself while your child owns 5 percent, and the IRS treats each of you as owning 11 percent. Both of you become U.S. shareholders whether you planned it that way or not.
Ownership held through partnerships, trusts, and estates can also be attributed out to the partners or beneficiaries in proportion to their interests. Layers of attribution can turn a person who directly owns nothing into a U.S. shareholder for CFC purposes. The rules are looking for real economic influence, not names on a stock certificate.
The Income That Gets Taxed to You Every Year
The core consequence of CFC status is that certain categories of the company’s earnings are taxed to U.S. shareholders as those earnings arise, not when a dividend is paid. This is a deemed inclusion: at year-end, you report your proportional share of the CFC’s covered income on your own return based on your ownership percentage and how many days you held the stock.1Office of the Law Revision Counsel. 26 U.S. Code 951 – Amounts Included in Gross Income of United States Shareholders The rationale is that a controlling U.S. group can distribute earnings at will, so the law doesn’t let them defer indefinitely.
Two categories of CFC income get pulled into your return this way.
Subpart F Income
Subpart F, on the books since the 1960s, targets income that is easy to shift into low-tax jurisdictions.4Office of the Law Revision Counsel. 26 U.S. Code 952 – Subpart F Income Defined The main buckets are:
- Foreign base company sales income: profits from buying or selling goods between related parties when the CFC didn’t manufacture the product and the transaction happened outside the CFC’s home country.
- Foreign base company services income: fees for services performed for or on behalf of a related party outside the country where the CFC is organized.
- Passive income: dividends, interest, rents, royalties, and gains from passive property.
- Insurance income: premiums from insuring risks located in the United States.
Net CFC Tested Income
The Tax Cuts and Jobs Act of 2017 added a second inclusion regime, originally called Global Intangible Low-Taxed Income (GILTI).5Office of the Law Revision Counsel. 26 U.S. Code 951A – Net CFC Tested Income Included in Gross Income of United States Shareholders For tax years beginning after December 31, 2025, the One Big Beautiful Bill Act (OBBBA) renamed it Net CFC Tested Income (NCTI) and made two changes worth knowing about.
The old GILTI calculation excluded a deemed 10 percent return on the CFC’s tangible depreciable property, known as Qualified Business Asset Investment. That carve-out is gone starting in 2026. Every dollar of tested income is now in the NCTI base, no matter how much factory or equipment the CFC owns. CFCs with heavy foreign capital investment will see substantially larger inclusions as a result.
Corporate U.S. shareholders can take a Section 250 deduction against their NCTI inclusion. For 2026, the deduction is 40 percent, which produces an effective U.S. tax rate of about 12.6 percent at the 21 percent corporate rate before foreign tax credits.6Office of the Law Revision Counsel. 26 U.S. Code 250 – Foreign-Derived Deduction Eligible Income and Net CFC Tested Income Under prior law the deduction was 50 percent, producing a 10.5 percent effective rate, so the minimum U.S. tax on foreign earnings has gone up.
Why Individuals Get Hit Harder Than Corporations
Individual U.S. shareholders don’t get the Section 250 deduction, and Subpart F and NCTI inclusions land on their return as ordinary income taxable at rates up to 37 percent. Compared with the roughly 12.6 percent corporate effective rate, that is a large gap. Section 962 exists to close it, and it’s covered below.
Getting Credit for Foreign Taxes Already Paid
CFC income has usually been taxed once already by the country where the CFC operates, so the code provides a credit mechanism to prevent double taxation. Under Section 960, a domestic corporation that reports a Subpart F inclusion is treated as having paid the foreign taxes properly attributable to that income, and those deemed-paid taxes generate a foreign tax credit against U.S. tax.7Office of the Law Revision Counsel. 26 U.S. Code 960 – Deemed Paid Credit for Subpart F Inclusions
For NCTI inclusions in 2026, corporate shareholders can credit 90 percent of the CFC’s foreign taxes on the tested income. The 10 percent haircut is new under the OBBBA; before 2026 it was 20 percent. Combined with the 40 percent Section 250 deduction, a corporate U.S. shareholder generally owes little or no residual U.S. tax on NCTI when the CFC’s foreign effective tax rate is around 14 percent or higher.
The Section 962 Election for Individuals
Individuals face the structural disadvantage described above: ordinary rates, no Section 250 deduction, and no deemed-paid foreign tax credit under Section 960. Section 962 offers a workaround. An individual U.S. shareholder can elect, year by year on their own return, to be taxed on CFC inclusions as if they were a domestic corporation.8Office of the Law Revision Counsel. 26 U.S. Code 962 – Election by Individuals To Be Subject to Tax at Corporate Rates The election drops the rate on the inclusion to 21 percent, unlocks the Section 960 credit, and allows the Section 250 deduction against NCTI, producing that same 12.6 percent effective rate before credits.
There is a catch. When the CFC actually distributes those previously taxed earnings, the individual owes tax on the amount of the distribution that exceeds the corporate-level tax already paid. In effect, Section 962 defers part of the individual-rate tax rather than eliminating it. For CFCs operating in moderate- and high-tax countries, the election usually pays off. In zero-tax jurisdictions the benefit is smaller, but rarely zero.
Previously Taxed Earnings and Profits
The code keeps a running tally of income you’ve already paid U.S. tax on so you aren’t taxed a second time when the CFC finally distributes cash. Those tracked balances are called previously taxed earnings and profits (PTEP), and Section 959 excludes qualifying distributions of PTEP from your gross income.9Office of the Law Revision Counsel. 26 U.S. Code 959 – Exclusion From Gross Income of Previously Taxed Earnings and Profits These distributions don’t qualify for preferential dividend rates, but the underlying income has already been taxed, so that doesn’t matter economically. PTEP accounting is complex and has become more so under the OBBBA, and mistakes lead to either double taxation or lost credits.10Internal Revenue Service. Effective Date and Application of Section 960(d)(4)
The Filing You Owe: Form 5471
Every U.S. shareholder of a CFC has to file Form 5471, the Information Return of U.S. Persons With Respect to Certain Foreign Corporations, with their annual tax return.11Internal Revenue Service. About Form 5471, Information Return of U.S. Persons With Respect to Certain Foreign Corporations The obligation applies even when the CFC had no Subpart F or NCTI income for the year. Form 5471 is one of the most detailed international filings the IRS requires.
The IRS sorts filers into five categories tied to their relationship with the foreign corporation, and the category determines which schedules a filer completes.12Internal Revenue Service. Instructions for Form 5471 Ongoing CFC shareholders typically fall into Category 5, which carries the heaviest load: a full set of financial statements for the foreign corporation translated into U.S. dollars, along with schedules covering Subpart F, NCTI, PTEP, and intercompany transactions. The form is due with the underlying return, meaning April 15 for individuals or March 15 for C corporations, extensions included.
What Happens if You Don’t File
The base penalty for failing to file Form 5471 is $10,000 per foreign corporation per annual accounting period.13Office of the Law Revision Counsel. 26 U.S. Code 6038 – Information Reporting With Respect to Certain Foreign Corporations and Partnerships Three unreported CFCs in a single year is a $30,000 opening bill. Once the IRS sends a notice of failure, another $10,000 accrues every 30 days, up to $50,000 more per corporation. A prolonged failure on a single CFC can reach $60,000. The penalties are per-entity, per-year, and not deductible.
The larger risk is the statute of limitations. A missing Form 5471 can keep the statute open on your entire return, not just the CFC items, until you file. Reasonable cause relief and the IRS’s first-time abatement program can help after the fact, but neither is something to plan around. The form is complex, the deadline is firm, and getting it filed is always cheaper than getting caught not filing it.