UK Limited Companies with US Owners: CFC Rules, Form 5471 and GILTI

The moment US ownership changes everything

Incorporate in the UK and the domestic obligations are familiar: corporation tax, annual accounts, payroll if you take salary. Add a US-person shareholder and a second layer appears, because US law looks through borders at its citizens' companies. The company is now a foreign corporation to the IRS — and if US persons together own more than half of it (by vote or value), it is very likely a controlled foreign corporation (CFC), the status that triggers the heaviest rules. A single American founder owning 100% of a UK Ltd is the textbook CFC.

None of this makes the structure wrong. It makes the structure reportable, and sometimes currently taxable, in ways that must be built into how the company is run.

Form 5471: the annual disclosure

A US person who owns enough of, or acquires or disposes of interests in, a foreign corporation generally must attach Form 5471 to their US return. For a controlling shareholder this is not a tick-box: it demands the company's income statement and balance sheet translated to US dollars and US concepts, ownership details, and schedules tracking earnings and transactions between shareholder and company.

The penalties are disproportionate to the effort of compliance: they begin at a fixed dollar amount per form, per year (in the five figures) for late or incomplete filing, with escalation, and a missing 5471 can hold open the IRS's ability to audit the entire return. In practice the form's real cost is preparation — it effectively requires a second set of accounts on US principles — which is why the company's UK bookkeeping should be set up with the 5471 in mind from day one.

GILTI: taxed on profits you never received

Since 2018, the GILTI regime (global intangible low-taxed income) can tax a US shareholder of a CFC currently on most of the company's active business profits above a routine return on its tangible assets — no dividend required. For a services or consulting company with few tangible assets, that can mean broadly the company's profits flowing onto the owner's US return each year as they arise.

Corporate US shareholders get a special deduction and generous foreign tax credit treatment; individuals, by default, get neither. An individual can respond in several ways, all of which exist and none of which is automatic:

• A section 962 election, under which the individual is taxed on GILTI as if a corporate shareholder — accessing the deduction and credits for UK corporation tax — with a later reckoning when profits are actually distributed. Concept only here: the arithmetic differs every year.
• Distribution and salary policy that reduces retained profits subject to the regime.
• In some profiles, holding-structure changes — with their own costs and consequences on both sides.

UK corporation tax at current rates often does much of the work of neutralising GILTI once the right elections and credits are in place — but only when someone actually runs the numbers on both systems each year.

Salary versus dividends: the classic UK plan, complicated

The standard UK owner-manager playbook — small salary, dividends for the rest — is built purely on UK arithmetic: corporation tax, dividend rates, National Insurance. With a US owner every lever moves twice:

The UK-optimal mix is frequently not the two-country optimal mix, and the answer shifts with profit levels and rate changes. It needs re-running, not remembering.

Running it well

A UK Ltd with a US owner is entirely workable — thousands operate — but it runs on coordination: books kept so the 5471 falls out of them, an annual GILTI and election calculation, a remuneration mix set against both systems, and both personal returns prepared by people who can see the whole picture. That combination is exactly what we provide, on fixed fees agreed in advance.