Family Investment Companies and the US Person: Why a UK Succession Structure Can Create Immediate American Tax

A family investment company is a private UK company holding a family's investments, with share classes arranged so the founder generation keeps control while value passes to the next. For a US citizen in that family - shareholder, director or funder - the same company is simply a foreign corporation, and the US anti-deferral rules can tax them on its income in the year it arises even though nothing has been distributed. A structure designed to defer UK tax can therefore accelerate US tax, which is why the American member has to be in the design conversation rather than discovered after incorporation.

Key takeaways

• A FIC is a UK close company. To the IRS it holds no special status: it is a foreign corporation.
• Where US persons own more than 50% of voting power or value and a US person owns 10% or more, it can be a controlled foreign corporation - and certain income becomes taxable to that person currently, with no dividend paid.
• Form 5471 obligations can attach to a US shareholder and also to a US officer or director who owns nothing.
• The PFIC regime usually stands aside where the CFC rules apply to the same shareholder and stock, but a small US holding needs testing.
• Gifting shares to US-person children engages the US gift tax system, and valuing restricted classes is contested.
• Since 6 April 2025 UK inheritance tax follows long-term residence, not domicile, so an existing FIC's IHT purpose should be re-tested.
• A FIC can still be right. The damage comes from retro-fitting one around an American family member.

What a FIC is, and why UK families use one

A FIC is not a statutory creature. It is an ordinary private limited company whose purpose is to hold investments - listed securities, funds, sometimes let property - rather than to trade. The founder generation funds it, takes shares carrying voting control, and issues separate classes to children, or to trusts for them, carrying rights to value and income with little or no vote.

The UK-side appeal is real. GOV.UK confirms that Corporation Tax is charged on a company's profits from trading, from investments and from selling assets for more than they cost, so a portfolio inside a FIC is taxed under the corporate regime rather than at the shareholder's personal rates; current rates are published on GOV.UK. Retained profit compounds inside the company, and share classes separate votes from value.

Two UK qualifications belong in the same breath. Almost every FIC is a close company: HMRC describes one broadly as a company under the control of five or fewer participators, or of any number of participators who are directors. And a close company not existing wholly or mainly for trading, commercial letting and similar listed purposes can fall within the close investment-holding company definition in CTA 2010 s.18N - a category an investment-holding FIC can easily meet.

The mechanism that changes everything

US citizenship is the hinge, and it does not care where anyone lives. The IRS is explicit that a US citizen or resident alien abroad is subject to tax on worldwide income from all sources, on the same filing rules as at home. The US built its anti-deferral regimes to stop US persons parking income inside foreign companies - and contribute capital, retain income, compound, distribute much later is precisely the economic logic of a FIC.

Run the controlled foreign corporation test first. The instructions to Form 5471 define a CFC as a foreign corporation whose US shareholders own, directly, indirectly or constructively within the meaning of section 958(a) and (b), on any day of the corporation's tax year, more than 50% of the total combined voting power of all classes of its voting stock, or more than 50% of the total value of its stock. A US shareholder is a US person owning 10% or more of that combined voting power or value.

Three features catch families out.

• Constructive ownership counts. Shares held by others, including family members and entities, can be attributed under section 958(b). A US member's own certificate starts the analysis, not ends it.
• Value counts as much as votes. The non-voting class engineered to carry growth to the children sits inside the value limb.
• Any single day will do, so a share issue, reorganisation or death mid-year can bring the company inside the test.

Tax without a distribution

Where the company is a CFC, certain categories of its income are included in a US shareholder's income in the year the company earns them, whether or not anything is distributed. That is the point of subpart F, and it is uncomfortably well matched to a FIC, whose income is the dividend, interest, rent and gain sort these rules concentrate on. US shareholders of CFCs also use Form 8992, U.S. Shareholder Calculation of Global Intangible Low-Taxed Income (GILTI) to figure inclusions under section 951A.

The result is a mismatch of timing and character. The company pays UK corporation tax on the UK timetable; the US shareholder may face a current inclusion on a different measure, in a different currency, on the calendar year. Relief for the UK corporate tax against that US charge is not automatic for an individual, though elections exist that can change how such inclusions are taxed and what credit is available. When a dividend is finally paid the two systems can disagree again, so the American member can end up paying throughout and again at the end. Our explainer on controlled foreign company rules walks the mechanics more slowly.

The reporting burden, and who it lands on

Form 5471 is the Information Return of U.S. Persons With Respect To Certain Foreign Corporations, filed, in the IRS's words, by certain US citizens and residents who are officers, directors, or shareholders in certain foreign corporations. That phrasing matters: officers and directors, not only owners. A US-citizen adult child appointed to the board as a gesture of inclusion can acquire a filing obligation from the appointment alone.

The instructions set out five categories of filer and more than one can apply at once - among them officers and directors caught by another US person's share acquisition, US persons acquiring or disposing of holdings around the 10% mark, US persons with control, and US shareholders of a CFC.

The penalties are not nominal: the instructions state $10,000 for each annual accounting period of each foreign corporation for failure to furnish the information required by section 6038(a) in time, a further $10,000 for each 30-day period once 90 days have passed after IRS notice, capped at $50,000 for each failure. Our Form 5471 page sets out what a complete filing involves. Reporting rarely stops there: Form 8938, Statement of Specified Foreign Financial Assets, applies where a person's specified foreign financial assets exceed the applicable reporting threshold.

Where PFIC comes in, and where it usually does not

A FIC often looks like a passive foreign investment company on paper. The instructions to Form 8621 apply that label where 75% or more of gross income for the year is passive, or at least 50% of the average percentage of assets held during the year produce passive income or are held for its production - and a company built to hold investments tends to meet one test or both.

In a family-controlled FIC, though, the regimes usually do not stack. The same instructions explain that a US shareholder within section 951(b) who includes in income a pro rata share of subpart F income for stock of a CFC that is also a PFIC will not generally be subject to the PFIC provisions for that same stock during the qualified portion of their holding period. Where the CFC rules bite, the PFIC rules generally step back - for that shareholder, that stock, that period.

The exposure sits at the edges, and it is genuinely uncertain.

• A US family member below the 10% needed to be a US shareholder gets no subpart F inclusion - and so may have no shelter from the PFIC regime.
• If aggregate US ownership never reaches the control test there is no CFC at all, and PFIC may be the live analysis for every US holder.
• The instructions note that attribution under section 1298(a)(2)(B) continues even where the corporation is not treated as a PFIC, and that indirect shareholders can be filers - so what the FIC holds can matter too.

Gifting shares to US-person children

The succession step brings in a second US system. The IRS defines the gift tax as a tax on the transfer of property by one individual to another while receiving nothing, or less than full value, in return, applying to any type of property and whether or not the donor intends a gift.

• Where the donor is a US citizen or resident, a gift of FIC shares sits inside the US gift tax system and Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return may be required. Exclusion and exemption figures move, so confirm them first.
• Where the donor is not a US person, US gift tax may not reach the transfer - but the American recipient now holds foreign corporation stock, with every consequence above, and may have receipt-reporting of their own.
• Valuation is the quiet problem. Classes with restricted voting or deferred rights are exactly what gets challenged, so agree the methodology at the outset.

On death, the IRS describes the estate tax as a tax on the right to transfer property at death, with includible property expressly extending to business interests - which is what FIC shares are. How far the estate tax reaches them depends on the holder's status and any applicable estate and gift tax treaty; our article on US estate and gift tax for Americans in the UK covers the interaction.

The UK inheritance tax angle has moved

Much FIC planning was designed against the old domicile rules, and those rules are gone. GOV.UK now provides that you are a long-term UK resident in a tax year if you are UK tax resident for either the previous 10 consecutive years or a total of 10 years or more within the previous 20, and that inheritance tax is then charged on transfers of overseas assets owned outright, or on death, as well as on overseas assets in a trust you have set up or added to.

Residence history, not domicile, now drives the IHT footprint, and it shifts as family members move. One related point should not be assumed away: HMRC states that business relief is not due where the business, or the business carried on by the company, consists wholly or mainly of dealing in securities, stocks and shares, dealing in land or buildings, or making or holding investments - so an investment-holding FIC should not be presumed to attract it. We cover the new test in UK inheritance tax and long-term residence for US citizens.

Designing a FIC with the American in the room

None of this makes a FIC wrong. It makes sequencing decisive.

1. Map the share register by tax status before incorporation, not after the first accounts.

2. Run the control tests on both limbs - voting power and value - with attribution applied, and re-run after any share issue, transfer or death.

3. Decide deliberately what the US member holds. Class rights are a design variable and can be drawn with the US tests in view.

4. Model the cash tax cost across both systems over the intended holding period, with and without distributions. A single-year comparison misleads.

5. Price the compliance honestly and fix the share valuation methodology at the outset.

6. If a FIC exists and an American has joined the family, do not unwind reflexively. Unwinding creates its own charges in both systems; sometimes the answer is to keep the structure and file it properly.

Structuring is fact-dependent, and nothing here is a recommendation to establish, retain or unwind any structure.

How we work on these

We are usually brought in alongside a family's existing UK advisers to own the US side of a structure designed without it: running the CFC and PFIC tests on the actual register, modelling the inclusions, building the reporting, and saying plainly where the two systems disagree. A licensed CPA or Enrolled Agent reviews and signs off every US filing; the UK side is reviewed by an ACCA-qualified accountant.

Our US-UK expat tax service sets out the engagement. If a FIC is being set up, or one exists and an American shareholder or director has come into view, book a confidential consultation.

This article is general information, not tax or legal advice, and does not create a professional relationship. It is not a recommendation to establish, retain or unwind any structure. Outcomes are highly fact-dependent and the rules change; rates, thresholds and exemptions move and are not stated here - confirm the current position with a licensed professional before acting.

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Reviewed by a CPA / Enrolled Agent. Last updated: 17 September 2026.

Official sources: IRS Form 5471 | IRS Form 5471 instructions | IRS Form 8992 (GILTI) | IRS Form 8621 instructions | IRS Form 8938 | IRS gift tax | IRS Form 709 | IRS estate tax | IRS estate and gift tax treaties | IRS citizens abroad | HMRC CTM60060 | HMRC CTM60710 | HMRC IHTM25261 | GOV.UK Inheritance Tax: long-term UK residents | GOV.UK Corporation Tax