If you are a U.S. citizen, green card holder, or resident who owns part of a company organized outside the United States, the controlled foreign corporation rules may tax you on that company's profits long before you ever take a dollar out. The CFC regime is the backbone of U.S. international tax for closely held foreign businesses, and it ties together three things people usually meet separately: Subpart F income, GILTI/NCTI, and Form 5471. This guide explains exactly when a foreign company is a CFC, who is taxed, how the tax works, and what the One Big Beautiful Bill Act changed for 2026 and beyond.
What Is a Controlled Foreign Corporation?
A controlled foreign corporation is any foreign corporation in which U.S. shareholders own more than 50% of the stock, measured by either total combined voting power or total value, on any day during the tax year. The test is mechanical and turns on two definitions working together: who is a "U.S. shareholder," and how much they collectively own.
The practical effect is that a foreign company with one U.S. owner who holds more than half of it is always a CFC. A solo expat founder who incorporates a consulting company in Portugal, a U.S. investor who owns 60% of a manufacturing company in Mexico, and three unrelated U.S. residents who each own 20% of a Singapore startup all create CFCs. By contrast, a foreign company owned 70% by non-U.S. persons and 30% by a single U.S. person can still be a CFC, because that U.S. person is a 10%-plus U.S. shareholder and owns less than 50%, so it would not be a CFC, but if two U.S. persons each owned 30%, their combined 60% would make it one.
Who Counts as a "U.S. Shareholder"?
A U.S. shareholder is a U.S. person who owns at least 10% of a foreign corporation's total voting power or total value. This 10% floor is the gateway to the entire regime: only U.S. shareholders are taxed on Subpart F income and NCTI, and only their stock is counted in the more-than-50% CFC test.
"U.S. person" is broad. It includes U.S. citizens regardless of where they live, lawful permanent residents (green card holders), individuals who meet the substantial presence test, domestic corporations, domestic partnerships, and most domestic trusts and estates.
The 10% Test Now Looks at Value, Not Just Vote
ImportantThrough 2017, a U.S. shareholder was defined only by 10% of voting power, which let some structures avoid the threshold by giving U.S. owners high-value but low-vote shares. The law was changed to add a 10%-of-value prong. Today you are a U.S. shareholder if you cross either 10% of vote or 10% of value.
This matters for founders with multiple share classes, profits interests, or preferred stock: a U.S. person can be a U.S. shareholder, and therefore exposed to Subpart F and NCTI, even with limited voting rights.
How Is a CFC Taxed? The Anti-Deferral System
The whole point of the CFC rules is to deny U.S. owners the ability to park profits in a low-tax foreign corporation and defer U.S. tax indefinitely. Instead, U.S. shareholders are taxed currently on two categories of the CFC's earnings, then receive previously taxed amounts tax-free when actually distributed.
Both regimes work by giving each U.S. shareholder a pro rata share of the relevant income and treating it as if it were received currently. Amounts already taxed become previously taxed earnings and profits (PTEP), and when the CFC later distributes that PTEP, the distribution is tax-free because it was already taxed. Your stock basis steps up for inclusions and down for tax-free PTEP distributions, preventing double taxation.
For a deeper treatment of each regime, see our dedicated guides to Subpart F income and GILTI, now NCTI.
What Did OBBBA Change About CFCs for 2026?
The One Big Beautiful Bill Act (OBBBA) made several structural changes to the CFC rules that take effect for tax years beginning after December 31, 2025, meaning the 2026 tax year is the first year they apply. These are some of the most consequential international changes in years.
Five OBBBA Changes Every CFC Owner Should Know
2026 Update- Section 958(b)(4) restored. OBBBA reinstated the rule that blocks "downward attribution" of stock from a foreign person to a U.S. person when testing CFC status. This reverses a 2017 change that had inadvertently turned many foreign-parented groups into CFCs and forced unrelated U.S. minority owners to file Form 5471.
- New Section 951B. To stop the restored rule from being used abusively, Congress added Section 951B, which applies CFC-style inclusions to "foreign-controlled U.S. shareholders" of "foreign-controlled foreign corporations" where downward attribution would otherwise have created a more-than-50% U.S.-owned result.
- Last-day rule repealed for Subpart F. A U.S. shareholder who owns CFC stock during any part of the year now includes a pro rata share of Subpart F income, even if they sold before year-end. (The last-day ownership rule still governs Section 956 investments in U.S. property.)
- GILTI renamed NCTI; tangible return eliminated. GILTI became Net CFC Tested Income (NCTI), and the 10% deemed return on tangible assets (QBAI) that used to reduce the base was repealed, so more active income is now currently taxed.
- Section 954(c)(6) made permanent. The CFC look-through rule for dividends, interest, rents, and royalties between related CFCs, long renewed year to year, is now permanent, simplifying multi-entity foreign groups.
The combined message of OBBBA is mixed for closely held owners. The restored attribution rule is taxpayer-favorable because it pulls many U.S. persons back out of accidental CFC status, but the elimination of the tangible-asset exemption is unfavorable because it expands the currently taxed NCTI base for genuine operating CFCs.
How Does Stock Attribution Decide CFC Status?
CFC status is determined not just by stock you hold directly but by stock attributed to you under Section 958's direct, indirect, and constructive ownership rules. Attribution is where many surprises live, because you can be treated as owning shares held by family members or related entities.
The Three Layers of CFC Ownership
- Direct ownership: stock you hold in your own name.
- Indirect ownership: stock you own through foreign entities, counted proportionately up the chain (for example, shares a foreign partnership you own holds in a foreign corporation).
- Constructive ownership: stock attributed from family members (spouse, children, grandchildren, parents) and between related entities and their owners under Section 318, as modified by Section 958(b).
The most common constructive-ownership trap is family attribution. A U.S. parent and a U.S. child who each own 30% of a foreign company are each treated as owning 60%, so the company is a CFC and both are U.S. shareholders, even though neither owns a majority outright. OBBBA's restoration of Section 958(b)(4) narrows one category of attribution (foreign-to-U.S. downward attribution) but leaves family attribution fully intact.
What Are the Reporting Obligations for a CFC?
Every U.S. shareholder of a CFC generally must file Form 5471, Information Return of U.S. Persons With Respect to Certain Foreign Corporations, attached to their annual return. Depending on the situation, officers, directors, and U.S. persons who acquire or dispose of large blocks of stock may also have to file under one of the form's separate categories.
A CFC frequently triggers a stack of additional filings, and satisfying one does not satisfy the others:
- Form 5471 reports the CFC, its income, its earnings and profits, and your inclusions.
- Form 8992 computes your GILTI/NCTI inclusion.
- Form 8993 computes the Section 250 deduction.
- Form 1118 (corporations) or Form 1116 (individuals, with a Section 962 election) claims the foreign tax credit.
- The FBAR (FinCEN Form 114) reports the foreign bank accounts the CFC's U.S. owner can sign on, and Form 8938 may report the stock as a specified foreign financial asset.
The Form 5471 Penalty and Statute-of-Limitations Trap
CautionFailing to file a required Form 5471 carries a $10,000 penalty per corporation per year, with additional $10,000 increments (up to $50,000 more) if the failure continues after the IRS sends notice. Worse, under Section 6501(c)(8), an unfiled Form 5471 keeps the statute of limitations on your entire tax return open, not just the CFC items, until three years after you finally file the form. A missed CFC filing can leave every line of your return auditable indefinitely. See our complete Form 5471 filing guide for the category-by-category requirements.
Can You Reduce CFC Tax With a Section 962 Election?
Yes. Individual U.S. shareholders can make a Section 962 election to be taxed on their Subpart F and NCTI inclusions at corporate rates, which unlocks the deemed-paid foreign tax credit and, for NCTI, the Section 250 deduction that individuals otherwise cannot use.
Without a 962 election, an individual pays tax on CFC inclusions at ordinary individual rates with no foreign tax credit for the corporate-level foreign taxes the CFC paid. With the election, the individual is treated, for that income, like a domestic C corporation: the 21% corporate rate applies, the 90% deemed-paid foreign tax credit is available, and (for NCTI) the 40% Section 250 deduction brings the effective pre-credit rate to roughly 12.6%.
The trade-off is that previously taxed income, when later distributed, is taxed again as a dividend to the extent it exceeds the U.S. tax actually paid under the 962 election. For CFCs operating in countries with a reasonable corporate tax rate, the 962 election often eliminates most or all current U.S. tax; for CFCs in zero-tax jurisdictions, the benefit is smaller. The analysis is fact-specific and should be run every year.
How Do You Plan Around the CFC Rules?
There is no single right structure, but a few planning themes recur for closely held foreign businesses.
- Run the 962 election every year. For operating CFCs that pay meaningful foreign tax, electing corporate-rate treatment plus the 90% foreign tax credit frequently drives the current U.S. cost toward zero. Re-run it annually because foreign tax rates and earnings change.
- Mind the high-tax exception. If the CFC's income is taxed abroad above 90% of the top U.S. corporate rate (currently 18.9%), a high-tax election can exclude that income from Subpart F and NCTI entirely.
- Watch the PFIC overlap. A foreign corporation that is both a CFC and a PFIC is generally taxed under the CFC rules for its 10%-plus U.S. shareholders, which is usually the better outcome and removes the punitive PFIC interest charge.
- Consider entity classification. A "check-the-box" election to treat the foreign company as a disregarded entity or partnership can sometimes simplify the result, though it triggers its own filings (such as Form 8858 or Form 8865) and is not always favorable.
- File on time, every year. The cheapest planning is timely, complete Form 5471 filing. The penalties and open-statute exposure dwarf the cost of preparing the form correctly.
Bottom Line
A controlled foreign corporation turns a foreign company into a current U.S. tax event for its 10%-or-more U.S. owners. Once the more-than-50% threshold is crossed, you are taxed on Subpart F income and NCTI in real time, you file Form 5471 every year, and the wrong move, or a missed form, can be expensive. OBBBA's 2026 changes pull some accidental U.S. shareholders out of the regime while expanding the taxable base for genuine operating businesses, which makes the Section 962 election and the high-tax exception more important than ever.
If you own part of a foreign company and are unsure whether it is a CFC, who must file Form 5471, or whether a Section 962 election would cut your bill, our international tax and cross-border tax teams can map your ownership, run the inclusions under the 2026 rules, and fix any prior-year filings through the right disclosure path. Have questions about controlled foreign corporations or Form 5471? Contact TS CPA for a free consultation. We respond within the same day.