Owning a foreign company as a US citizen triggers a web of anti-deferral rules that were specifically designed to prevent US shareholders from indefinitely sheltering profits in low-tax jurisdictions. The two most important regimes are the Controlled Foreign Corporation (CFC) rules and Global Intangible Low-Taxed Income (GILTI). Understanding them is not optional; the penalties for non-compliance are severe, and the rules apply whether or not you knew about them.
What Is a Controlled Foreign Corporation?
A Controlled Foreign Corporation is any foreign corporation in which US shareholders own more than 50% of the voting power or value, counting all US shareholders who own 10% or more individually. If you own 51% of a UK Ltd, Irish Limited, or Cayman company, it is a CFC, and a battery of reporting and tax obligations immediately apply.
- 10% threshold: any US person owning 10%+ of a foreign corp must file Form 5471
- Constructive ownership rules: stock held by related parties (family, entities you control) is attributed to you
- Form 5471 penalties: $10,000 per year per CFC for failure to file, automatically assessed
- FBAR: foreign bank accounts of the CFC with aggregate balances over $10,000 must be reported on FinCEN 114
Subpart F Income: The Original Anti-Deferral Rule
Subpart F (IRC §§951–964) requires US shareholders to include certain categories of CFC income in their taxable income in the year earned, regardless of whether the CFC actually distributes the money. The income categories most commonly triggering Subpart F are: Foreign Personal Holding Company Income (FPHCI): dividends, interest, royalties, rents, and gains from passive assets, and income from services performed outside the CFC's country of incorporation.
For a typical offshore consulting company, services income billed to non-local clients is usually Subpart F income. The profits are taxable to the US shareholder the year they are earned, even if left in the company.
- Foreign Personal Holding Company Income: dividends, interest, royalties, and passive rents: all Subpart F
- Services income: generally Subpart F unless the service is performed within the CFC's country of incorporation
- Foreign Base Company Sales Income: buy from a related party, sell to customers outside the CFC's country: Subpart F
- De minimis and full-inclusion exceptions apply: consult a specialist before assuming your income is exempt
GILTI: The Second Layer of Tax
GILTI (IRC §951A) was enacted in 2017 as part of the Tax Cuts and Jobs Act. It subjects US shareholders to immediate taxation on CFC profits that are considered 'low-taxed intangible income,' which in practice means almost all CFC profits that are not already hit by Subpart F or that don't benefit from a tangible asset return.
GILTI applies even if your CFC earns perfectly legitimate business income from real clients. The relevant test is not what the income is from; it is how much tax the foreign jurisdiction charges on it.
- GILTI formula: CFC tested income minus 10% of qualified business asset investment (QBAI) = GILTI inclusion amount
- Individual rate: US individual CFC shareholders are taxed on GILTI at ordinary income rates (up to 37%) with limited FTC offset
- C-Corp rate: US corporations pay 10.5% on GILTI after a 50% deduction, with 80% FTC availability
- GILTI High-Tax Exclusion: CFC income taxed at >18.9% effective rate abroad can be excluded from GILTI; choose to elect or not each year
Practical Implications for Business Owners
If you own a foreign company and have been treating its profits as deferred, not paying US tax until you receive a dividend, there is a significant risk you have unpaid Subpart F or GILTI inclusions going back to when the CFC was formed. The statute of limitations does not begin until a complete and accurate Form 5471 is filed.
Many offshore structures sold to US entrepreneurs online simply do not account for these rules. The fact that the offshore jurisdiction does not tax the income does not mean the US does not.
- Retroactive risk: Subpart F and GILTI inclusions can be assessed back to formation if Form 5471 was never filed
- Voluntary disclosure: the IRS Streamlined Filing Compliance Procedures may reduce penalties for non-willful non-filers
- Earnings and Profits tracking: accurate E&P records are required to calculate Subpart F, GILTI, and eventual distribution taxation
- Deemed paid credit: corporations (not individuals) can credit foreign taxes paid by the CFC against their GILTI liability
Structuring Around CFC Rules: What Actually Works
Legitimate planning options exist. A US LLC may serve the same function as a foreign company for many US-based entrepreneurs without triggering CFC rules. For those who need a foreign entity, for local market access, banking, or contractual requirements, the structure must be designed with CFC and GILTI in mind from day one.
Strategies that actually work include: electing to treat the foreign entity as a disregarded entity or partnership (if eligible), using a Section 962 election to get corporate-level GILTI treatment, ensuring genuine tangible asset investment to maximize the QBAI deduction, and, for high earners, considering the path to expatriation and exit from the US tax system entirely.
Our custom structuring team designs entities from the CFC analysis backwards, not the other way around. See our custom tax services and Nomadic Go's offshore company structuring (fulfilled by our sister brand) for how we approach US-owned foreign entities.
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