PFIC vs CFC: Key differences, tax rules, and reporting requirements for US expats in 2026

Written by  Mel Whitney, EA

Last updated Jul 16, 2026

A passive foreign investment company is defined by what a foreign corporation earns or holds – specifically, the 75% passive income test or the 50% passive asset test under IRC Sec. 1297(a). A controlled foreign corporation is defined by who owns it – US shareholders owning at least 10% each must collectively hold more than 50% of the voting power or value under IRC Sec. 957.

A foreign corporation can be both a PFIC and a CFC simultaneously, but the CFC/PFIC overlap rule under IRC Sec. 1297(d) generally prevents double taxation by prioritizing CFC treatment.

Understanding the distinction between CFC and PFIC classifications matters because each regime triggers different forms, different tax calculations, and different penalties. A US expat holding shares in a foreign mutual fund faces PFIC rules and Form 8621.

A US expat who owns a majority stake in a foreign operating company faces CFC rules and Form 5471. And in some cases, both regimes apply to the same entity – which is where the overlap rule under IRC Sec. 1297(d) becomes critical.

This article covers CFC and PFIC taxes for expats filing for the 2025 tax year during the 2026 filing season, including classification tests, reporting forms, tax treatment under each regime, and what to do if your foreign investment triggers both sets of rules.

What is a passive foreign investment company (PFIC)?

A PFIC is any foreign corporation that meets either the 75% passive income test or the 50% passive asset test under IRC Sec. 1297(a). Meeting either test in a single year is sufficient for PFIC classification – and once PFIC status attaches, the tax consequences follow the shareholder, not the entity.

The PFIC rules do not require a minimum ownership percentage. A US person holding 1% of a foreign mutual fund is subject to the same PFIC regime as someone holding 50%. However, Form 8621 filing requirements depend on the applicable reporting rules and exceptions under IRC Section 1298(f) and the Form 8621 instructions.

For a detailed breakdown of the default PFIC tax treatment under Section 1291, see the TFX guide to excess distribution rules under IRC Section 1291.

PFIC income test and asset test explained

The IRS applies two independent tests to determine PFIC status, and a foreign corporation only needs to meet one to be classified as a PFIC:

• Income test (75% test): If 75% or more of the corporation’s gross income for the tax year is passive income – including dividends, interest, rents, royalties, and capital gains – the corporation is a PFIC. The PFIC income test measures what the company earns, not what it distributes.
• Asset test (50% test): If 50% or more of the average value of the corporation’s assets produce, or are held for the production of, passive income, the corporation is a PFIC. The PFIC asset test measures what the company holds, including cash, marketable securities, and other passive assets.

Based on a common TFX client scenario: a US expat holds shares in a foreign holding company that keeps 60% of its assets in bonds and cash equivalents. Even though the company earns some active business income from a subsidiary, the asset composition triggers the 50% passive asset test – making the entity a PFIC.

For information on the QEF election as an alternative to the punitive default PFIC method, see the TFX guide to QEF elections for PFIC reporting.

What is a controlled foreign corporation (CFC)?

A controlled foreign corporation is a foreign corporation where US shareholders – each owning at least 10% of the total combined voting power or value – collectively own more than 50% of the voting power or value under IRC Sec. 957.

The CFC rules focus on who controls the company, not on what kind of income it earns.

The 10% threshold applies per shareholder, and constructive ownership rules under IRC Sec. 318 and 958 can attribute shares owned by family members, partnerships, trusts, or related entities to a US person. This means you may be treated as a 10% shareholder even if you directly own less than 10%.

For a full explanation of how the IRS applies attribution rules in the CFC context, see the TFX guide to constructive ownership rules.

CFC ownership test: who qualifies as a US shareholder?

Under IRC Sec. 951(b), a US shareholder for CFC purposes is any US person who owns 10% or more of the total combined voting power or value of a foreign corporation.

The CFC ownership test has three key elements:

1. 10% per-shareholder threshold. Each US person must own at least 10% of the foreign corporation’s total voting power or total value. Both direct and indirect ownership count, as do constructive ownership rules under IRC Sec. 958.
2. Aggregate 50% control test. The US shareholders who meet the 10% threshold must collectively own more than 50% of the total voting power or total value of the foreign corporation. If the aggregate falls at or below 50%, the entity is not a CFC.
3. Constructive ownership attribution. IRC Sec. 318, as modified by IRC Sec. 958, attributes stock ownership through family members, partnerships, estates, trusts, and corporations. These attribution rules can push a US person over the 10% threshold or push the aggregate over 50%.

Based on a common TFX client scenario: a US expat owns 30% of a foreign consulting firm, and their US spouse owns 25%. Each spouse individually exceeds 10%, and their combined ownership of 55% crosses the 50% aggregate threshold – making the company a CFC. Both spouses are US shareholders subject to CFC reporting.

For details on the forms triggered by CFC ownership, see the TFX guide to foreign company tax reporting.

Key differences between a PFIC and a CFC

The fundamental difference between a PFIC and a CFC lies in how each classification is triggered – PFICs are defined by what a company earns or holds, while CFCs are defined by who owns the company.

A PFIC can be owned by a single US person with even 1% ownership, while CFC status requires US shareholders to collectively own more than 50%.

The following table summarizes the core differences between PFIC and CFC classifications:

The PFIC vs CFC distinction determines which forms you file, which tax rates apply, and which elections are available. Getting the classification wrong – or failing to recognize that both may apply – is one of the most common and costly mistakes US expats make with foreign investments.

For additional context on how these classifications interact with broader foreign corporation filing requirements, see additional filing requirements for taxpayers with non-US corporations.

Can a CFC also be a PFIC? Understanding the overlap

Yes. A controlled foreign corporation can also qualify as a passive foreign investment company if it meets either the 75% income test or the 50% asset test under IRC Sec. 1297(a). The two classifications operate independently – CFC status is determined by ownership, and PFIC status is determined by income and asset composition.

A single entity can satisfy both sets of criteria at the same time.

Based on a common TFX client scenario: a US expat owns 60% of a foreign holding company that derives 80% of its income from dividends and interest earned on its investment portfolio. The expat’s ownership exceeds the CFC threshold – more than 50% held by US shareholders owning at least 10% each. The company’s income composition exceeds the 75% passive income test. The entity is both a CFC and a PFIC simultaneously.

The question of whether a foreign corporation is a CFC or PFIC – or both – is not academic. Each classification triggers a different reporting form, a different tax calculation, and a different penalty regime. When both apply, the CFC PFIC overlap rule under IRC Sec. 1297(d) determines which regime takes priority.

For background on the advantages and risks of offshore corporate structures, see the TFX article on offshore corporation benefits and disadvantages.

The CFC/PFIC overlap rule under IRC Sec. 1297(d)

Under IRC Sec. 1297(d), a US shareholder that qualifies for the CFC overlap exception generally is not subject to the PFIC regime for the same stock during the qualified portion of the holding period, preventing double taxation under both regimes.

The interaction of the overlap rule with Subpart F and post-TCJA GILTI rules can be complex and should be evaluated under the current regulations.

The PFIC CFC overlap rule applies at the shareholder level, not the entity level. This means different shareholders in the same company may be subject to different regimes.

A US person who owns 15% of a foreign corporation that qualifies as both a CFC and a PFIC is generally subject to the CFC regime rather than the PFIC tax regime under the overlap rule. Whether Form 8621 must still be filed depends on the reporting rules under IRC Section 1298(f) and the Form 8621 instructions.

A US person who owns 3% of the same company is below the CFC ownership threshold and remains subject to PFIC rules – they file Form 8621.

How the overlap rule changed after aggregate treatment regulations

Under Treasury Decision 9960, finalized in 2022, the IRS adopted aggregate treatment for domestic partnerships and S corporations. This shifted the CFC PFIC overlap rule analysis from the entity level to the individual partner or shareholder level.

Before T.D. 9960, if a domestic partnership owned shares in a foreign corporation, the partnership itself was tested for CFC/PFIC overlap.

After T.D. 9960, the overlap rule is tested at the individual partner level. Each partner’s ownership percentage, voting power, and inclusion status are evaluated separately to determine whether CFC treatment displaces PFIC treatment.

For information on late elections to end PFIC treatment when CFC status applies, see the IRS page for Form 8621-A.

PFIC vs CFC taxation: how each regime works

PFIC excess distributions are taxed at the highest ordinary income rate plus an interest charge going back to the year the income was earned, making the default PFIC method the most punitive option available.

By contrast, CFC Subpart F rules require current inclusion of passive income each year, regardless of whether any distribution is actually made – but without the retrospective interest charge.

The following table compares the five tax treatment methods across the PFIC and CFC regimes:

CFC vs PFIC taxation differs most in timing and penalty structure. The CFC regime taxes income currently – you include your share of Subpart F income and GILTI each year, whether or not you receive a distribution.

The default PFIC regime allows deferral but imposes a punitive interest charge when income is eventually recognized. The QEF and mark-to-market elections eliminate the interest charge by requiring annual inclusion, bringing PFIC treatment closer to CFC treatment.

For details on how the Section 962 election can reduce the individual GILTI rate, see the TFX guide to the Sec. 962 election for US owners of CFCs.

Subpart F income and GILTI: the CFC anti-deferral regime

US shareholders of a CFC must include their pro-rata share of Subpart F income and GILTI in gross income each year, even if no actual distribution is made. These are the two main anti-deferral mechanisms in the CFC regime:

• Subpart F income under IRC Sec. 951 includes foreign base company income – primarily passive income such as dividends, interest, rents, royalties, and certain related-party transactions. It also includes insurance income and income from certain international boycotts. Subpart F income is taxed currently at the shareholder’s ordinary income rate.
• GILTI tax under IRC Sec. 951A captures the CFC’s remaining tested income – broadly, income that is not already Subpart F income, ECI, or certain other excluded categories. For tax year 2025, the GILTI calculation subtracts a deemed 10% return on QBAI from tested income, and many corporate taxpayers may have an effective rate of approximately 10.5% after the applicable Section 250 deduction, subject to the taxpayer’s facts. For individuals without a Sec. 962 election, the rate can reach 37%.

For background on specified foreign corporations and how GILTI applies to US expats, see the TFX article on specified foreign corporations and their importance for Americans abroad.

PFIC reporting requirements: Form 8621

US persons who are direct or indirect shareholders of a PFIC may be required to file Form 8621 for each PFIC held, subject to the reporting rules and exceptions under IRC Section 1298(f) and the Form 8621 instructions.

Although Form 8621 generally does not carry a separate monetary penalty for failure to file, failing to file a required Form 8621 may suspend the statute of limitations under IRC Section 6501(c)(8), allowing the IRS additional time to assess tax until the required information is provided.

A statutory reasonable-cause exception may limit the scope of that suspension in certain circumstances.

The following five situations may trigger a Form 8621 filing requirement for the 2025 tax year:

1. Receiving an excess distribution from a PFIC under Sec. 1291.
2. Disposing of PFIC stock at a gain or loss.
3. Making or maintaining a QEF or mark-to-market election – including years with no distributions or dispositions.
4. Making certain other elections reportable in Part II of Form 8621.
5. Being required to file the annual PFIC information report under IRC Sec. 1298(f), even if no distribution or sale occurred, unless a reporting exception applies. If the PFIC is also a CFC, determine whether Form 8621 is still required under IRC Section 1298(f), the applicable regulations, and the Form 8621 instructions. The CFC/PFIC overlap rule may affect taxation, but it does not automatically eliminate reporting requirements.

CFC reporting requirements: Form 5471

US shareholders, and certain officers and directors meeting the Form 5471 category requirements, may be required to file Form 5471 for a controlled foreign corporation annually.

The IRS has assessed Form 5471 penalties of $10,000 per year per CFC, and courts have upheld these penalties even when taxpayers were unaware of the filing requirement.

Penalties start at $10,000 per form per year for failure to file, with additional $10,000 penalties for each 30-day period after IRS notice, up to a maximum additional penalty of $50,000.

Form 5471 filers are grouped into categories based on their relationship to the foreign corporation:

• Category 1: US shareholders of specified foreign corporations under Sec. 965.
• Category 2: US citizens or residents who are officers or directors when a US person acquires 10% ownership.
• Category 3: US persons who acquire or dispose of stock meeting the 10% threshold.
• Category 4: US persons who control a foreign corporation (own more than 50%).
• Category 5 (including Categories 5a, 5b, and 5c): Certain US shareholders of controlled foreign corporations.

Category 4 and 5 filers have the most extensive reporting obligations, including Schedule J (accumulated earnings and profits) and Schedule P (previously taxed earnings and profits).

For the full Form 5471 filing requirements and penalty structure, see the TFX guide to Form 5471 penalties.

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PFIC elections: QEF, mark-to-market, and default method compared

US shareholders of a PFIC have three tax treatment options, and choosing the wrong one – or failing to elect – results in the most punitive treatment under the default Section 1291 excess distribution rules.

A timely QEF election generally should be made with the return for the first eligible year. Late or retroactive elections may be available in certain circumstances under the applicable IRS rules and procedures.

The PFIC default method under Section 1291 is the most expensive option.

Excess distributions and gains on disposition are allocated ratably across the shareholder’s holding period, and each year’s allocation is taxed at the highest ordinary income rate in effect for that year – plus an interest charge compounded from each allocation year to the current year.

For shareholders who have held PFIC stock for many years, the combined tax and interest charge can exceed the gain itself.

If you hold shares in a foreign mutual fund or ETF that is a PFIC, request a PFIC Annual Information Statement from the fund’s investor relations team early – ideally shortly after year-end. Without that statement, a QEF election is difficult to support, and you may be stuck with the punitive default method.

Practical guide: determining whether you have a PFIC, CFC, or both

Based on a common TFX client scenario, a US expat owning 60% of a foreign holding company that earns dividend income primarily must work through a five-step analysis to determine whether CFC rules, PFIC rules, or both apply:

1. Determine if the entity is a foreign corporation. A foreign corporation is any corporation not created or organized in the United States or under US law. Entity classification under the check-the-box rules (Reg. §301.7701-3) controls the analysis – a foreign LLC may be treated as a corporation.
2. Apply the CFC ownership test. Do US shareholders owning at least 10% each collectively own more than 50% of the voting power or value? Include constructive ownership under IRC Sec. 958. If yes, the entity is a CFC.
3. Apply the PFIC income test and asset test. Is 75% or more of gross income passive? Or are 50% or more of assets passive? If either test is met, the entity is a PFIC.
4. If both tests are met, apply the IRC Sec. 1297(d) overlap rule. For each US shareholder who qualifies for the CFC overlap exception under IRC Sec. 1297(d), PFIC treatment is generally suspended – though the analysis may require review of the current regulations, particularly regarding the post-TCJA GILTI coordination rules. Minority shareholders below 10% remain subject to PFIC rules.
5. Determine the applicable forms. CFC shareholders file Form 5471. PFIC shareholders file Form 8621. If the overlap rule applies, the shareholder generally files Form 5471 and is relieved of PFIC treatment – but should confirm whether annual reporting under Sec. 1298(f) still requires Form 8621.

The overlap rule does not eliminate PFIC status entirely – it only suspends PFIC treatment for qualifying US shareholders.

Minority shareholders in the same company who do not meet the CFC ownership threshold are not subject to CFC rules but still face PFIC reporting obligations – understanding both the PFIC and CFC classification of the entity remains important for determining the correct filing path.

Foreign tax credit and treaty considerations for PFIC and CFC holders

Domestic corporations may claim deemed-paid foreign tax credits under IRC Sec. 960 for certain foreign taxes associated with Subpart F and GILTI inclusions. Individual US shareholders generally receive these credits only if they make a Section 962 election and satisfy the applicable requirements. PFIC shareholders under the Section 1291 default method have no equivalent credit mechanism – foreign taxes paid at the PFIC level do not flow through to the US shareholder as a creditable tax.

This distinction makes the CFC regime more favorable in high-tax jurisdictions. For example, foreign corporate taxes paid by a German CFC may reduce US tax for a domestic corporate shareholder or an individual who makes a Section 962 election. The available credit depends on the applicable FTC limitation and the shareholder’s specific calculations.

For details on claiming the foreign tax credit and calculating Form 1116, see the TFX guide to claiming the foreign tax credit.

For a comparison of the FTC with the Foreign Earned Income Exclusion, see foreign tax credit vs. foreign earned income exclusion.

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Penalties for PFIC and CFC non-compliance

Failing to file Form 5471 for a CFC triggers an automatic $10,000 penalty per form per year, while failing to file a required Form 8621 for a PFIC may suspend the statute of limitations under IRC Sec. 6501(c)(8), allowing the IRS additional time to assess tax.

The IRS has successfully argued that a single missed Form 5471 filing can result in $10,000 in penalties even when the taxpayer owed no additional tax.

The penalty structures for PFIC CFC non-compliance differ in important ways:

CFC penalties – Form 5471:

• $10,000 per form per year for failure to file.
• Additional $10,000 per 30-day period after IRS notice, up to $50,000 maximum additional penalty.
• Potential 10% reduction in foreign tax credits under IRC Sec. 6038(c), increasing by 5% per quarter.
• Criminal penalties possible for willful non-compliance under IRC Sec. 7203.

PFIC penalties – Form 8621:

• No specific dollar penalty for failure to file.
• Failure to file a required Form 8621 may suspend the statute of limitations under IRC Sec. 6501(c)(8). A statutory reasonable-cause exception may limit the scope of that suspension in certain circumstances.
• Open-ended audit exposure for the entire tax return, not just the PFIC-related items.

For background on the consequences of undisclosed foreign assets, see the TFX article on criminal conviction and deportation risks for green card holders with undeclared foreign assets.

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