Subpart F rules can require a US shareholder of a Controlled Foreign Corporation (CFC) to report certain foreign corporate income on their US tax return even when the company has not distributed that income to them.
Common examples can include interest, dividends, royalties and certain related-party sales or service income. The calculation is closely connected to CFC reporting and Form 5471.
Owning a company outside the United States does not necessarily allow an American to leave the company’s profits overseas and defer US tax until the money is distributed.
For Americans who own shares in a Controlled Foreign Corporation, Subpart F is one of the rules that can cause foreign corporate earnings to become taxable in the United States before the shareholder actually receives the money.
This can affect Americans operating through companies such as a German GmbH, UK Ltd, Danish ApS, Dutch BV or Spanish SL.
The important question is not simply whether the foreign company made a profit. You need to determine what type of income the company earned, whether it falls within a Subpart F category and how much must be included on the US shareholder’s return.
Key Takeaways: Subpart F Income
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Subpart F generally applies to US shareholders of Controlled Foreign Corporations.
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Certain income can be taxable to the shareholder even when the CFC makes no distribution.
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Passive income such as interest, dividends, rents and royalties can fall within Subpart F, but exceptions may apply.
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Certain related-party sales and services can also produce Subpart F income.
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Subpart F calculations are reported through Form 5471 and can affect other international tax calculations.
Quick Facts About Subpart F Income
| Question | What US Shareholders Should Know |
| Who can be affected? | US shareholders of a Controlled Foreign Corporation |
| Does the company have to distribute the income? | No. Subpart F can create current US taxable income without a distribution |
| Is all CFC income Subpart F income? | No. Only income falling within specific statutory categories is included |
| What is a common example? | Interest or investment income earned by a CFC |
| Can business income qualify? | Yes, particularly certain related-party sales or services |
| Where is it reported? | The calculation involves Form 5471 and its applicable schedules |
| Can exceptions apply? | Yes. Several exceptions and limitations can change the result |
What is Subpart F Income
Subpart F is part of the US Controlled Foreign Corporation tax regime.
Normally, a corporation and its shareholders are treated separately for tax purposes. Without special international tax rules, a US shareholder might therefore be able to leave profits inside a foreign corporation and postpone US shareholder-level taxation until those profits were distributed.
Subpart F limits that deferral for certain categories of income.
When a CFC earns qualifying Subpart F income, a US shareholder may have to include their applicable share of that income in current US taxable income even though the money remains inside the foreign corporation. The IRS instructions specifically require US shareholders of CFCs with Subpart F income to report the income on their returns.
This is why an American can potentially have a US tax liability connected to a foreign company without receiving an equivalent dividend or cash payment.
What Types of Income Can Be Subpart F Income?
Subpart F contains several income categories, and determining whether income qualifies requires looking at how the CFC earned it rather than simply whether the business was profitable.
Foreign Personal Holding Company Income
Foreign personal holding company income is one of the most common Subpart F categories.
It can include income such as:
- Dividends
- Interest
- Certain rents and royalties
- Annuities
- Certain gains from property transactions
- Certain foreign currency gains
- Income equivalent to interest
The current Form 5471 instructions specifically identify these and other categories when calculating a shareholder’s share of Subpart F income.
However, this does not mean every euro of interest, rent or royalty income earned by a CFC automatically produces the same US tax result. Various exclusions, exceptions and related-party rules may apply.
Foreign Base Company Sales Income
Subpart F can also apply to certain sales involving related parties.
For example, a CFC may purchase goods from a related company and sell those goods to another party, or purchase goods from an unrelated supplier and sell them to a related company.
Whether the income falls within the foreign base company sales rules depends on factors including the parties involved, where the goods are manufactured and where they are sold or used.
This is particularly relevant for multinational businesses that use related foreign companies for purchasing, distribution or sales.
Foreign Base Company Services Income
Certain services performed for or on behalf of related parties can also create Subpart F income.
For example, suppose an American owns a foreign corporation that provides consulting services to another related company. Depending on where the services are performed and the relationship between the companies, some of the resulting income may need to be tested under the foreign base company services rules.
For Americans operating international groups of companies, related-party transactions therefore require particular attention.
Not Sure Which Category Applies to Your Company?
Interest, rents, royalties, related-party sales, and related-party services are all tested differently. We can look at your specific structure and tell you what actually counts.
Does Ordinary Business Income Count as Subpart F Income?
Not necessarily.
One of the most important distinctions is between ordinary active business income and the specific categories captured by Subpart F.
Consider an American living in Germany who owns 100% of a German GmbH providing marketing services to unrelated German customers. The fact that the GmbH earns a profit does not, by itself, mean all of that profit is Subpart F income.
However, if the GmbH also holds significant cash and earns interest, that interest may need to be separately analyzed under the foreign personal holding company income rules.
Similarly, changing the facts so that the GmbH performs services for a related company outside Germany could create a different Subpart F analysis.
This is why the underlying transactions matter.
Subpart F vs. NCTI: What is the Difference?
Subpart F is not the only US anti-deferral regime affecting CFC owners.
Beginning in 2026, the regime formerly known as Global Intangible Low-Taxed Income (GILTI) was renamed Net CFC Tested Income (NCTI). Your foreign company’s income may therefore need to be analyzed under both sets of rules.
The two regimes are related but target different income.
| Subpart F | NCTI |
| Targets specified categories of CFC income | Broadly applies to CFC tested income |
| Often associated with passive and certain related-party income | Commonly captures active business income not otherwise excluded |
| Calculated first | Tested income generally excludes Subpart F income |
| Can apply without a distribution | Can also create taxable income without a distribution |
Because Subpart F income is generally excluded from tested income, the same income is not simply taxed once under Subpart F and again as NCTI.
Can the High-Tax Exception Apply to Subpart F Income?
Potentially.
Certain foreign base company income may qualify for the Subpart F high-tax exception when the applicable requirements are satisfied and the election is properly made.
This can be particularly important for Americans operating companies in relatively high-tax countries.
The Form 5471 instructions specifically incorporate the Section 954(b)(4) high-tax exception into the Subpart F calculation.
However, eligibility should not be determined simply by looking at the headline corporate tax rate in the foreign country. The effective foreign tax rate applicable to the relevant income must be considered under the US rules.
How is Subpart F Income Reported?
Subpart F reporting is closely connected with Form 5471.
Form 5471 is used by certain US officers, directors and shareholders to report their relationship with a foreign corporation. For CFC owners, the form can require detailed financial, ownership and tax information.
The calculation can involve several Form 5471 schedules and worksheets depending on the shareholder’s filing category and the type of income involved.
The shareholder’s Subpart F inclusion is then reflected on the applicable US tax filings.
This is one reason Form 5471 preparation requires more than simply converting a foreign company’s profit into US dollars.
The company’s financial statements may need to be analyzed under US tax principles to determine which income belongs in Subpart F, which belongs in NCTI, which may qualify for an exception, and how the resulting amounts flow through the shareholder’s return.
Why Subpart F Matters for Americans with Foreign Companies
Subpart F can be easy to overlook because the income may never appear on the shareholder’s personal bank statement.
An American may see profits retained by a GmbH, Ltd or other foreign corporation and assume there is nothing to report personally until the company pays a dividend.
US CFC rules can produce a very different result.
That is why foreign company owners should review Subpart F alongside Form 5471 and the broader CFC rules each year rather than waiting until profits are distributed.
Profits Sitting Abroad? Subpart F May Apply
Subpart F can create US tax even if you’ve never taken a distribution. We can review your company’s income and make sure nothing’s being missed.
