Owning a UK Ltd as a US citizen

Incorporating in the UK is routine: a one-person limited company is a common, efficient way to run a business. For a US owner the same structure pulls in a set of US rules aimed at Americans who control foreign companies, and they turn a simple Ltd into a meaningful compliance project.

Controlled foreign corporation rules

A CFC, a controlled foreign corporation, is a non-US company that US persons own more than half of. A solely owned UK Ltd is a textbook CFC. The label matters because it switches on US rules that can tax the company's profits in the owner's hands, regardless of whether the money is distributed.

Form 5471

A US owner of a CFC generally files Form 5471 with their return each year. It is one of the most demanding US information returns, requiring the company's accounts to be restated in US terms, and the penalty for not filing is steep and starts whether or not any tax is due. The form alone is a reason many Americans take advice before incorporating.

GILTI

GILTI, global intangible low-taxed income, can tax the company's retained profits on the US owner's personal return even if nothing has been paid out. Designed for large multinationals, it sweeps in small owner-managed companies too. Reliefs and elections exist, and UK corporation tax already paid can offset some of it, but it has to be calculated and claimed rather than assumed.

The practical takeaway

None of this makes a UK Ltd impossible for an American, but it changes the maths. Operating as a sole trader, or planning the company structure with a cross-border accountant before incorporating, often avoids the worst of the filing. The reporting also feeds the wider FATCA and Form 8938 picture.