The Single-Member LLC with a Foreign Owner: What UK Founders Should Know Before Opening a US Company

A single member LLC with a foreign owner sounds like an exotic arrangement. In practice it has become one of the most common structures in cross-border self-employment: one person, resident outside the United States, owning an American limited liability company outright and running it from wherever they already live. For UK founders selling to American clients, it is worth understanding why this structure keeps appearing, what it actually does, and just as importantly what it does not do.

What a single-member LLC with a foreign owner actually is

An LLC is a US state-level company form, and US law imposes no citizenship or residency condition on ownership. A sole owner in London, Manchester, or anywhere else can hold 100 percent of one. With a single owner the company is, by default, treated as a disregarded entity for US federal tax purposes: the LLC itself files no standalone federal income tax return, and the tax result follows the owner and the nature of the income. Whether any US tax arises depends on facts (chiefly whether the business has US-source or effectively connected income), which is precisely the kind of question to settle with a cross-border accountant before forming anything.

What the structure reliably provides is separation and identity: a company that signs contracts, invoices in dollars, holds US-facing accounts, and absorbs commercial risk, while the owner remains a UK tax resident answerable to HMRC on their worldwide income as usual. A US LLC changes the plumbing of a business; it does not move anyone’s tax residence.

You already have a Ltd. Why would you want an American company?

Most UK founders asking this question already run a perfectly good limited company. The US entity earns its place only when the friction is specifically American:

• US clients and procurement. American firms onboard a US vendor with a US tax ID noticeably faster than a foreign company with international wire instructions. For consultants and agencies, that onboarding delay is often the real sales cycle.
• US platforms and marketplaces. Payment processors, marketplaces, and app ecosystems built around US business records work most smoothly behind a US entity and its federal tax number.
• Dollar revenue hygiene. A dedicated US company keeps dollar income in a clean ledger rather than washing through personal accounts or distorting the Ltd’s books.

If the client base is British or European, none of this applies and the extra entity is overhead. The honest test is simple: is the friction you are trying to remove located in the United States?

How the two structures divide the work

The last row deserves emphasis. A foreign-owned single-member LLC files an annual information return with the IRS, Form 5472 attached to a pro forma 1120, and the penalty for missing it starts at 25,000 dollars. It is an information filing rather than a tax bill, but it is the obligation new owners most often discover late, usually because the cut-price formation that created the company never mentioned it.

What setting one up involves

The sequence is short but strict: choose the state and file the formation; maintain a registered agent (the mandatory in-state contact for legal mail) and a US business address; then obtain the EIN, the federal tax number every downstream application asks for. The EIN is where non-resident owners lose time, because the IRS online application requires a Social Security Number and the manual alternative, a Form SS-4 with the responsible-party section completed for a foreign owner, takes weeks. Founders assemble these pieces directly with the state and the IRS, or hand the sequence to a business formation platform built for non-resident owners; either way, the deliverable that matters is a consistent document set, because banks and payment providers judge the paperwork, and the institutions always make their own decisions.

Running costs are modest on either path: state fees from roughly 100 dollars at formation and 60 a year afterwards, agent and address services on top, and bundled packages from specialist providers landing at a few hundred dollars a year all-in.

The sober conclusion

For a UK founder with genuinely American revenue, a foreign-owned single-member LLC is unglamorous, useful infrastructure: it shortens vendor onboarding, unlocks US payment rails, and contains commercial risk, for the price of a modest annual budget and three calendar entries a year. For everyone else it is a solution shopping for a problem. Decide with your accountant, sequence the EIN first if you proceed, and treat Form 5472 with the respect a five-figure penalty deserves.