GILTI, Subpart F and CFC Rules Explained
U.S. international tax explained
GILTI, Subpart F and CFC Rules Explained for Tax Professionals
GILTI, Subpart F and CFC rules are some of the most confusing areas of U.S. international tax. They matter because a U.S. person may have taxable income from a foreign company even when no dividend is paid. This guide explains the rules in plain English with examples that EAs, CAs, CPAs and U.S. tax learners can actually remember.
Quick answer: CFC vs Subpart F vs GILTI
A Controlled Foreign Corporation is a foreign corporation that is more than 50% owned by U.S. shareholders by vote or value on any day of the tax year (IRC Section 957). Subpart F pulls certain categories of CFC income, such as insurance income and foreign base company income, into a U.S. shareholder’s current gross income (IRC Section 952). GILTI is a separate current inclusion rule under IRC 951A that generally targets a CFC’s tested income above a routine return on tangible assets (IRS GILTI practice unit).
CFC, Subpart F and GILTI in one table
Most learners get stuck because they try to understand GILTI before identifying the CFC. Use this order instead: first ask whether there is a CFC, then check whether any income is Subpart F, then analyse whether the remaining tested income creates GILTI.
| Concept | Plain-English meaning | Memory hook | Why it matters |
|---|---|---|---|
| CFC | A foreign corporation controlled by U.S. shareholders. | “Who controls the company?” | If there is no CFC, the CFC-specific Subpart F and GILTI rules generally do not start. |
| Subpart F | Certain types of CFC income taxed currently to U.S. shareholders even without distribution. | “Bad or mobile income gets pulled up.” | It targets categories such as foreign base company income and insurance income. |
| GILTI | A broad current inclusion for tested CFC income above a routine tangible-asset return. | “Residual CFC profits after routine return.” | It can tax active foreign business income even if no cash is distributed. |
Simple sequence
CFC first, Subpart F second, GILTI third. If you remember only one workflow, remember this: identify ownership, classify income, then calculate tested income.
What is a Controlled Foreign Corporation?
A controlled foreign corporation is a foreign corporation where U.S. shareholders own more than 50% of the total combined voting power or total stock value on any day during the foreign corporation’s tax year (IRC Section 957). A U.S. shareholder, for this purpose, is generally a U.S. person who owns at least 10% of the vote or value of a foreign corporation (IRC Section 951).
Step 1
Find the foreign corporation. A foreign branch, partnership or disregarded entity may raise different questions.
Step 2
Identify U.S. shareholders who own at least 10% of vote or value, including indirect or constructive ownership issues.
Step 3
Check whether those U.S. shareholders collectively own more than 50% of vote or value on any day of the year.
Example: CFC because one U.S. person controls the company
A U.S. citizen owns 60% of a Singapore company, and a non-U.S. investor owns 40%. The U.S. citizen owns at least 10%, and U.S. shareholders own more than 50%, so the Singapore company is a CFC.
Example: CFC because multiple U.S. shareholders together cross 50%
Three U.S. persons each own 20% of an Indian private company, and non-U.S. persons own the remaining 40%. Each U.S. person is a 10% U.S. shareholder, and together they own 60%, so the foreign corporation is a CFC.
Example: watch the 10% shareholder threshold
Six unrelated U.S. persons each own 9% of a foreign corporation, and non-U.S. persons own the balance. Even though U.S. persons collectively own 54%, none of them reaches the 10% U.S. shareholder threshold in this simplified example, so the basic CFC analysis may not reach the same result. In practice, always check attribution rules before concluding.
What is Subpart F income?
Subpart F income is a set of income categories that can be included currently in a U.S. shareholder’s gross income when earned by a CFC. IRC Section 952 includes insurance income, foreign base company income, international boycott income, illegal bribes or kickbacks, and income from certain sanctioned countries under Section 901(j) (IRC Section 952).
| Subpart F category | Plain-English example | Why it is targeted |
|---|---|---|
| Foreign personal holding company income | A foreign company earns interest, dividends, rents, royalties or investment gains. | Passive income is easier to move offshore and defer. |
| Foreign base company sales income | A related-party sales structure routes profits through a low-tax foreign company. | The rule targets related-party profit shifting. |
| Foreign base company services income | A foreign company performs services for a related party outside its country of organisation. | The rule looks for related-party services income shifted offshore. |
| Insurance income | A foreign insurance structure earns income from insuring related or offshore risks. | Insurance income has special anti-deferral rules. |
Example: passive interest income
A U.S. citizen owns 100% of a Cayman company. The company has no employees and earns $80,000 of interest income from investments. That interest may be foreign personal holding company income, which is a type of foreign base company income, and therefore may be Subpart F income.
Example: no dividend, but still taxable
The same Cayman company does not distribute cash to the U.S. owner. The Subpart F issue does not disappear simply because cash stayed offshore, because a U.S. shareholder of a CFC includes the pro rata share of Subpart F income in gross income under the current inclusion rule (IRC Section 951).
Common learner mistake
Do not say “foreign company income is only taxed when dividend is paid.” That may be true for some foreign corporation situations, but CFC rules can create current inclusion even with no cash distribution.
What is GILTI?
GILTI stands for Global Intangible Low-Taxed Income. The IRS explains that GILTI applies to U.S. shareholders of CFCs and requires an annual gross income inclusion, with the concept approximating intangible income by assuming a 10% return on tangible assets and treating income above that normal return as intangible income (IRS GILTI practice unit).
Simplified GILTI idea
GILTI ≈ tested income minus 10% routine return on qualified tangible assets, subject to detailed exclusions, deductions, losses, interest expense and shareholder-level rules.
The IRS explains that tested income excludes items such as effectively connected U.S. trade or business income, gross income taken into account in determining Subpart F income, income excluded by the high-tax exception, related-person dividends and foreign oil and gas extraction income (IRS GILTI practice unit). This is why Subpart F and GILTI should be analysed together rather than separately.
Example: simple GILTI calculation
A U.S. corporation owns 100% of a foreign software company. The foreign company has $500,000 of tested income and $1,000,000 of qualified tangible assets. A simplified routine return is 10% of $1,000,000, or $100,000. Before other adjustments, the rough GILTI concept is $500,000 minus $100,000, or $400,000.
Example: why Subpart F comes before GILTI
A CFC has $600,000 of total income: $100,000 of passive interest income and $500,000 of active service income. The $100,000 passive income may be analysed under Subpart F first, while the remaining active tested income may then be considered for GILTI. This avoids treating the same income as both Subpart F and GILTI in the simplified workflow.
Five practical examples for tax professionals
These examples are simplified for learning. Real CFC, Subpart F and GILTI work can involve attribution, entity classification, high-tax exceptions, foreign tax credits, Section 962 elections, earnings and profits, tested losses and multiple forms.
Example 1: U.S. founder owns an Indian company
A U.S. citizen moves to Bengaluru and owns 100% of an Indian consulting company. The company earns active consulting income but pays no dividend. The first question is whether the Indian company is a CFC. If yes, the next questions are whether any income is Subpart F and whether active tested income creates GILTI.
Example 2: U.S. shareholder owns a foreign investment company
A U.S. person owns 70% of a foreign corporation that only holds listed shares and earns dividends. The company is likely a CFC in this simplified fact pattern, and the dividend income may raise foreign personal holding company income and Subpart F issues.
Example 3: Foreign manufacturing company with real assets
A U.S. corporation owns 100% of a Mexican manufacturing company. The CFC has factory equipment and active income. GILTI analysis may be important because the 10% routine return on tangible assets can reduce, but not necessarily eliminate, tested income exposure.
Example 4: Related-party services
A U.S. parent pays a related foreign company for services performed for another group company outside the foreign company’s country. This may trigger foreign base company services income questions before the preparer even reaches GILTI.
Example 5: Individual shareholder and Section 962 question
An individual U.S. shareholder has potential GILTI from a CFC. Individuals generally do not automatically get the same corporate GILTI treatment, so the adviser may need to consider whether a Section 962 election should be analysed. The IRS practice unit notes that individuals who elect under IRC 962 may be taxed at corporation rates and may claim certain deemed-paid foreign tax credit benefits for GILTI (IRS GILTI practice unit).
Where Form 5471 fits in
Form 5471 is the information return that certain U.S. citizens and residents who are officers, directors or shareholders in certain foreign corporations file to satisfy reporting requirements under Sections 6038 and 6046 and related regulations (IRS Form 5471 page). For a tax professional, Form 5471 is often the practical warning sign that a foreign company issue is not just a normal dividend question.
| Client says | Tax professional should ask | Possible issue |
|---|---|---|
| “I own a company in India, but it never paid me.” | What percentage do you own? Are you a U.S. person? Who are the other shareholders? | CFC, Form 5471, Subpart F, GILTI. |
| “The company only has investments.” | What income did the company earn: dividends, interest, rents, royalties or capital gains? | Foreign personal holding company income and Subpart F. |
| “It is an active business, not passive.” | What is tested income, tangible asset base, foreign tax paid and ownership structure? | GILTI, foreign tax credits, Section 962. |
Tax professional checklist: how to approach a CFC case
This is the practical workflow to use when a client mentions a foreign company. It is deliberately simple, because most errors happen before the detailed calculation starts.
Facts to collect first
- Country of incorporation.
- Entity classification for U.S. tax.
- Shareholder list by vote and value.
- Whether each owner is a U.S. person.
- Direct, indirect and constructive ownership.
- Financial statements and earnings detail.
- Foreign tax paid or accrued.
Questions to answer next
- Is the company a CFC?
- Is the taxpayer a U.S. shareholder?
- Is there Subpart F income?
- Is there tested income or tested loss?
- Is QBAI relevant?
- Is Form 5471 required?
- Should Section 962 be reviewed for an individual?
Red flags that need specialist review
Multiple foreign entities, related-party transactions, low-tax jurisdictions, foreign losses, foreign tax credits, PFIC overlap, Section 962 analysis, treaty positions and late Form 5471 filings should be escalated to a specialist rather than handled as a routine return input.
Why EAs, CAs and U.S. tax learners should study these rules
For enrolled agents, CAs and U.S. tax professionals, CFC rules are an important step from return preparation into international tax advisory. The technical rules are complex, but the commercial skill is simple: recognise when a foreign company creates current U.S. tax and reporting exposure.
| Learner type | Why these rules matter | Best next step |
|---|---|---|
| EA candidate | International tax appears in business and individual tax contexts, but core EA exam knowledge comes first. | Use the Surgent Enrolled Agent Review Course through Eduyush if you are still preparing for the EA exam. |
| Qualified EA | CFC, GILTI and Subpart F knowledge helps you spot cross-border risks before a client files incorrectly. | Build specialist knowledge with the AICPA U.S. International Tax Certificate through Eduyush. |
| Indian CA, CPA or ACCA | U.S. outsourcing and global tax teams often need staff who understand CFC reporting and international tax vocabulary. | Read Eduyush’s AICPA U.S. International Tax Certificate review before choosing a learning path. |
How to study GILTI, Subpart F and CFC rules with AI
AI can help learners practise examples, but it should not replace the Code, IRS guidance, course material or professional judgement. Use AI to simplify concepts and test understanding, not to finalise client positions.
Prompt for CFC ownership
“Create five CFC ownership examples with U.S. and non-U.S. shareholders. For each example, explain whether the foreign corporation is a CFC and why.”
Prompt for Subpart F classification
“Give me 10 examples of foreign company income and classify whether each could raise Subpart F issues. Explain the reasoning in simple language.”
Prompt for GILTI calculation practice
“Create three simplified GILTI examples using tested income, QBAI and a 10% routine return. Show the calculation step by step and list assumptions.”
Prompt for client interview practice
“Act as a U.S. client who owns a foreign company. Give me facts one by one, and ask me what additional questions I need before deciding whether Form 5471, Subpart F or GILTI may apply.”
Final takeaway
CFC is the ownership gate, Subpart F is the targeted anti-deferral income rule, and GILTI is the broader tested-income inclusion rule. If you can separate those three ideas, international tax becomes much easier to learn and explain.
Build this skill properly
If you are still preparing for the EA exam, start with Surgent EA Review through Eduyush. If you already work in tax and want deeper U.S. international tax capability, explore the AICPA U.S. International Tax Certificate through Eduyush.
FAQs on GILTI, Subpart F and CFCs
What is a controlled foreign corporation?
A controlled foreign corporation is a foreign corporation where U.S. shareholders own more than 50% of the total vote or value on any day during the foreign corporation’s tax year (IRC Section 957).
What is Subpart F income in simple terms?
Subpart F income is certain CFC income that may be taxed currently to a U.S. shareholder even when the CFC does not distribute cash. Categories include insurance income and foreign base company income, among others (IRC Section 952).
What is GILTI in simple terms?
GILTI is a current income inclusion for U.S. shareholders of CFCs that generally targets tested income above a routine return on tangible assets (IRS GILTI practice unit).
Can Subpart F and GILTI apply even if no dividend is paid?
Yes. Both Subpart F and GILTI can create current U.S. income inclusions even when the foreign company does not distribute cash to the U.S. shareholder.
Where does Form 5471 fit in?
Certain U.S. citizens and residents who are officers, directors or shareholders in certain foreign corporations file Form 5471 to satisfy reporting requirements under Sections 6038 and 6046 and related regulations (IRS Form 5471 page).
What should I study after learning CFC, Subpart F and GILTI basics?
Next, study foreign tax credits, Section 962 elections, tax treaties, transfer pricing, FATCA, FIRPTA and inbound/outbound transactions. Eduyush’s AICPA U.S. International Tax Certificate is designed to cover a broader international tax pathway.
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