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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →CFIUS reviews certain foreign investments and real-estate transactions for U.S. national-security risks, but not every transaction it can review requires a filing. The main mandatory declaration triggers concern certain critical-technology transactions and certain foreign-government interests in TID U.S. businesses. Whether either rule applies depends on the transaction, investor, business and regulatory conditions.
What does CFIUS review?
The Committee on Foreign Investment in the United States (CFIUS) is an interagency committee authorized to review certain transactions involving foreign persons and U.S. businesses or real estate. Its review is focused on national-security concerns; it is not a general approval process for all foreign investment.
- Transactions that could give a foreign person control of a U.S. business. CFIUS may review a transaction that could result in foreign control of any U.S. business, regardless of whether the investor qualifies as an “excepted investor.”
- Certain noncontrolling investments. CFIUS may have jurisdiction over some investments in a TID U.S. business—one involved with critical technology, covered sensitive personal data, or specified critical infrastructure—when the investor receives particular rights or access. A minority stake alone does not answer the question.
- Certain real-estate transactions. CFIUS may review some purchases, leases or concessions involving property in the United States, depending on the foreign person, property, transaction and location.
Jurisdiction and mandatory filing are separate questions: a transaction can be within CFIUS’s review authority without triggering a mandatory declaration.
Which foreign investments require a CFIUS filing?
Treasury describes two principal categories of covered business transactions that can trigger a mandatory declaration under the Part 800 rules. These are screening categories, not a substitute for checking the rule’s definitions, conditions, exceptions and applicability provisions.
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- Certain critical-technology transactions. A covered transaction involving a U.S. business that produces, designs, tests, manufactures, fabricates or develops critical technologies may require a declaration when the applicable regulatory conditions are met.
- Certain foreign-government interests in a TID U.S. business. A covered transaction may require a declaration when a foreign person with a substantial interest in a foreign government acquires a substantial interest in a TID U.S. business, subject to the rule’s conditions and exceptions.
“Sensitive industry” is not, by itself, a filing test. For example, whether a business is a TID U.S. business, whether an investor receives covered rights, and whether a mandatory-filing condition applies all require fact-specific analysis. Treasury also identifies cybersecurity systems, natural-resource processing, and national-security-related regimes such as ITAR, EAR and NISPOM as potentially useful diligence topics; none is a standalone filing trigger in this summary.
How do CFIUS declarations and notices differ?
For business transactions, parties may use a short-form declaration or a more detailed written notice. A declaration is an alternative to the traditional voluntary notice and is generally limited to five pages, according to Treasury. A declaration is not a guarantee that CFIUS will conclude its review based on that submission.
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| Path | When it may be used | What to expect |
|---|---|---|
| Mandatory declaration | When a covered business transaction meets an applicable mandatory-declaration rule. | The filing obligation depends on the rule’s specific conditions and exceptions. A declaration assessment may lead to further steps rather than a final conclusion. |
| Voluntary declaration | When parties choose to approach CFIUS through a declaration where permitted. | It offers a shorter submission route, but CFIUS may ask for a notice or take another action. |
| Written notice | When parties choose, or CFIUS requests, the traditional notice process. | It is a separate filing path; the appropriate submission depends on the transaction and the information needed for review. |
After assessing a declaration, CFIUS may conclude action, request a written notice, state that it cannot conclude action on the declaration, or initiate unilateral review. The parties should therefore consider the transaction’s complexity and information needs, not assume that a declaration is always preferable or that a voluntary notice is always required.
Does CFIUS review real-estate transactions?
Yes, certain transactions involving U.S. real estate can fall under the separate Part 802 rules. Treasury says that transactions described in those real-estate regulations are not subject to a mandatory declaration requirement as a general rule. Parties may nevertheless choose to submit a notice or declaration.
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Coverage is not determined by proximity alone. The analysis can depend on the investor, transaction, property characteristics, location, relationship to covered ports, and applicable exceptions. Some urban-area, single-housing-unit and other exclusions may apply; certain urban-area property can still be covered when it is near particular military installations or associated with covered ports.
A real-estate acquisition may be excluded from Part 802 because it is part of a covered business transaction under Part 800. That does not necessarily put it outside CFIUS jurisdiction: Part 800 may still apply, and a mandatory business-transaction declaration requirement should be assessed separately.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should parties screen a transaction?
Use the current text of 31 C.F.R. Parts 800 and 802 for the governing definitions and exceptions. The following checklist identifies the main questions; it is not a transaction-specific filing determination.
- Identify the transaction and investor. Establish what is being acquired, who the foreign person is, and what ownership or other interests are changing.
- Assess control and covered rights. Review governance, access to information, decision-making rights and other rights that may matter even when the investment is noncontrolling.
- Characterize the U.S. business. Determine what it does, whether it may be a TID U.S. business, and whether critical technologies or other relevant activities are involved.
- Test the mandatory-declaration conditions. Apply the specific Part 800 rules to the investor, business and transaction, including relevant exceptions and applicability provisions.
- If real estate is involved, assess Part 802 separately. Examine the property, location, transaction and exceptions, then check whether the acquisition is part of a Part 800 covered business transaction.
- Choose a filing path if appropriate. Determine whether a declaration is mandatory, whether a voluntary declaration is available, or whether a written notice better fits the facts and review needs.
Because ownership, governance and information rights, business activities, investor status, property location and regulatory applicability can change the result, parties evaluating a live deal should consult qualified U.S. CFIUS and national-security transaction counsel.
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What do CFIUS filing figures show?
In its 2024 annual report, the U.S. Department of the Treasury reported that CFIUS assessed and took action on 116 covered-transaction declarations during calendar year 2024. Of those, six concerned covered real-estate transactions under Part 802, and 36 were identified as subject to mandatory filing requirements based on party stipulations. These are annual activity figures, not predictions about an individual transaction.
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