Subpart F Income: Taxing CFC Profits Early

Key Takeaways

• Subpart F income taxes U.S. shareholders on certain CFC earnings before any distribution.
• The main category is foreign base company income, including passive and certain related-party income.
• A common error is missing the de minimis and high-tax exceptions that can switch off the rule.
• It taxes income currently, like GILTI, but targets specific passive and mobile income.

What Subpart F Income Is

Subpart F income is defined in Internal Revenue Code section 952. A U.S. shareholder of a controlled foreign corporation, or CFC, must include its pro rata share of this income under section 951, whether or not the CFC pays a dividend. A CFC is a foreign corporation more than half owned by U.S. shareholders that each own at least 10 percent.

Section 952 lists several categories: insurance income, foreign base company income, international boycott income, certain illegal payments, and income from sanctioned countries. For most investors the important one is foreign base company income under section 954, which itself contains foreign personal holding company income, foreign base company sales income, and foreign base company services income.

The Intuition

A U.S. group could place passive assets, such as bonds or stock, inside a foreign subsidiary in a low-tax country and let interest and dividends pile up untaxed by the United States. Subpart F removes that incentive by taxing the shareholder on that income right away.

The rule focuses on income that is easy to move and not tied to real local activity. Passive income, related-party sales routed through a tax haven, and services performed for related parties outside the CFC's home country are classic targets. Genuine active business income earned where the CFC operates generally falls outside Subpart F, though GILTI may still reach it.

How It Works

Subpart F income is computed at the CFC level, then allocated to U.S. shareholders by ownership. Several screens can reduce or eliminate it.

Foreign personal holding company income = dividends, interest, rents, royalties, gains
Foreign base company sales income       = related-party goods, made and sold abroad
Foreign base company services income    = services for related parties, outside home country
De minimis rule  = if such income < lesser of 5% of gross income or 1,000,000, treat as zero
Full inclusion   = if such income > 70% of gross income, the whole amount is subpart F

Two exceptions matter most. The de minimis rule turns off Subpart F treatment when the relevant income is small relative to the CFC's gross income. The high-tax exception can exclude income already taxed abroad above a set fraction of the U.S. corporate rate. Total Subpart F income also cannot exceed the CFC's current earnings and profits.

Worked Example

Suppose a U.S. person owns 100 percent of a CFC that earns 2,000,000 dollars total, including 300,000 dollars of interest and dividends on a portfolio it holds abroad.

Passive (FPHCI)    = 300,000
Gross income       = 2,000,000
De minimis test    = 300,000 vs lesser of 100,000 (5%) or 1,000,000
Result             = 300,000 exceeds 100,000, so de minimis fails
Subpart F income   = 300,000 included by the U.S. shareholder now

The 300,000 dollars of passive income is taxed to the U.S. owner this year even though no dividend was paid. The remaining 1,700,000 dollars of active income is not Subpart F, though GILTI may still apply.

Common Mistakes

1. Waiting for a dividend. Subpart F income is taxed when earned. No distribution is required to trigger it.

2. Missing the de minimis rule. Small amounts of tainted income are ignored entirely. Overlooking the threshold can overstate the inclusion.

3. Forgetting the high-tax exception. Income already taxed heavily abroad may be excluded. Skipping the test can double up tax unnecessarily.

4. Confusing it with GILTI. Subpart F covers specific passive and mobile income, while GILTI sweeps in broad active profit. They apply in a set order.

5. Ignoring the earnings and profits cap. Subpart F income cannot exceed the CFC's current earnings and profits, which can limit a large inclusion.

Frequently Asked Questions

What is Subpart F income in simple terms? Subpart F income is certain profit of a U.S.-controlled foreign company, like interest and dividends, that the U.S. owner must report and pay tax on right away. It applies even if the foreign company sends no money home.

How does Subpart F income affect investment decisions? It removes the tax benefit of parking passive assets in a foreign subsidiary, so investors weigh it when structuring offshore holdings. The de minimis and high-tax exceptions can change whether the rule bites, as the worked example shows.

What is a real-world example of Subpart F income? A U.S. owner of a foreign company that earns 300,000 dollars of interest and dividends must include that passive income now if it exceeds the de minimis threshold, even with no dividend paid.

How can investors avoid surprises with Subpart F income? Track the categories of tainted income, test the de minimis and high-tax exceptions each year, and consider a Section 962 election if an individual holds the CFC. A cross-border adviser can confirm the ordering with GILTI.

How is Subpart F income different from GILTI? Subpart F targets specific passive and mobile income of a CFC, while GILTI taxes the broad excess of a CFC's active profit. Subpart F is applied first, and income caught there is not counted again under GILTI.

Sources

1. Cornell Legal Information Institute. "26 U.S.C. 952 - Subpart F income defined." https://www.law.cornell.edu/uscode/text/26/952
2. Cornell Legal Information Institute. "26 U.S.C. 954 - Foreign base company income." https://www.law.cornell.edu/uscode/text/26/954
3. Cornell Legal Information Institute. "26 U.S.C. 951 - Amounts included in gross income of United States shareholders." https://www.law.cornell.edu/uscode/text/26/951
4. IRS. "Tax Cuts and Jobs Act, summary of changes to international tax provisions." https://www.irs.gov/businesses/international-businesses/tax-cuts-and-jobs-act-of-2017-summary-of-changes-to-international-tax-provisions

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.