Written by — Co-Founder, Expert Sapiens
Reviewed June 2026
Tax
What Is Controlled Foreign Corporation (CFC)?
Definition
A Controlled Foreign Corporation (CFC) is a foreign company in which US persons own more than 50% of the voting power or value — triggering complex US tax reporting obligations for the US shareholders.
US shareholders of a CFC face significant compliance requirements, including annual Form 5471 filings and potential current US tax on undistributed foreign earnings under the GILTI (Global Intangible Low-Taxed Income) and Subpart F rules. This means US shareholders can owe US tax on income that the foreign company never actually distributed to them. CFC rules were significantly expanded by the 2017 Tax Cuts and Jobs Act. Any US person who owns or controls a foreign company — including founders of companies incorporated outside the US — should consult an international tax specialist to understand their obligations before the situation becomes a compliance problem.
Why it matters
Founders and investors who establish foreign holding structures without understanding CFC rules can face unexpected US tax bills and substantial penalties for late or unfiled returns. Many cross-border entrepreneurs discover their exposure years after the fact. An international tax advisor can assess your structure, determine your reporting obligations, and help you plan efficiently within the rules.