Form 5471 for a UK Company: A Guide for US Founders

Form 5471 for a UK company: an introduction

Form 5471 for a UK company is the US information return that a US person files when they own or run a British limited company. It goes in with your personal US tax return every year. However, most UK accountants have never seen one, and most founders learn of it late. Therefore, it is one of the most commonly missed forms among Americans in business in Britain.

This guide explains who must file, which category you fall into and what the form contains. Furthermore, it covers the deadline, the penalty and the way back if you have missed years. Our full guide to US-UK tax for founders, fund managers and executives sets the form in its wider context.

Why Form 5471 for a UK company matters

The form matters because the United States taxes its citizens on worldwide income, including income earned through companies they control. A UK limited company is a separate taxpayer in Britain. Nevertheless, the IRS wants to see inside it. Consequently, the form asks for the company's accounts, its owners and its dealings with you.

In our experience, the trigger is ordinary. A US citizen in London sets up a consultancy, a software business or a property company. The UK side runs smoothly for years. Meanwhile, nobody mentions the US form, and each missed year carries its own penalty.

What the form is

Form 5471 is the Information Return of US Persons With Respect to Certain Foreign Corporations. The IRS describes it on its Form 5471 page, and the detailed rules are in the instructions for Form 5471. The legal basis is section 6038 of the Internal Revenue Code. Importantly, the form itself raises no tax. It reports information that other parts of your return then use.

Who has to file Form 5471?

You usually have to file if you are a US person who owns 10% or more of a UK company, or who is an officer or director when a US person acquires such a stake. US persons include citizens and green card holders wherever they live. Therefore, a founder who has lived in Britain for twenty years is still within the rule.

The 10% ownership test

A US shareholder, for these rules, is a US person who owns 10% or more of the votes or the value of a foreign company. Section 951 of the Internal Revenue Code sets out the definition. Moreover, ownership includes shares that you hold through other entities. It also includes shares attributed to you from certain family members.

When a UK company is a controlled foreign corporation

A controlled foreign corporation is a foreign company in which US shareholders together own more than 50% of the votes or the value. The test is in section 957 of the Internal Revenue Code. A sole American founder therefore owns a controlled foreign corporation from the first day.

Two points catch founders out. First, exactly 50% is not control. A company owned equally by an American and an unrelated British co-founder is not a controlled foreign corporation. Second, shares held by a spouse who is not a US person are generally not attributed to the American spouse. However, a company that escapes this status can fall into the PFIC rules instead, which are often worse.

Directors and officers

Ownership is not the only trigger. Specifically, a US citizen who serves as a director or officer can have a filing duty in a year when a US person acquires 10% or more. For example, an American director files when a US investor joins the share register. Hence, you can owe the form without owning a single share.

Which category of filer are you?

The instructions sort filers into five categories, and your category decides which schedules you complete. Most founders fall into more than one at once. Therefore, working out the categories is the first real step in preparing Form 5471 for a UK company.

Categories 2 and 3: officers and new shareholders

Category 2 covers a US officer or director of a foreign company in which a US person acquires 10% or more. Category 3 covers a US person who acquires 10% or more, or who drops below that level. Consequently, the year you form or buy into the company is normally a Category 3 year. These categories need details of the shareholders and the acquisition, not the full accounts.

Categories 4 and 5: control and CFC shareholders

Category 4 covers a US person who controlled the company during its accounting period. Category 5 covers a US shareholder of a controlled foreign corporation. A sole or majority American founder is usually both, every year. As a result, Form 5471 for a UK company is at its fullest for that founder. Category 1 relates to a 2017 transition tax and rarely affects a new company.

What goes on the form?

A full filing contains the company's income statement and balance sheet, restated under US accounting principles and converted into US dollars. It then adds a series of schedules. Importantly, you cannot simply attach the accounts filed at Companies House.

Accounts restated in dollars

UK accounts follow UK accounting standards and are drawn up in pounds. The form needs US principles and dollars. Therefore, a preparer adjusts the figures and converts them. The IRS publishes yearly average exchange rates that many filers use for the income statement. Additionally, the form covers the company's own accounting period that ends within your US tax year. A March year end therefore still works.

The schedules that matter most

Several schedules carry the weight. Schedule E reports the UK corporation tax the company paid. Schedules H and J track its earnings and profits. Schedule M lists transactions between you and the company, such as salary, dividends and loans. Furthermore, Schedule I-1 computes the income that feeds Form 8992. Schedule O reports the formation and any share acquisitions.

How the form connects to US tax on profits

The form feeds the rules that can tax a company's profits to you before any dividend. These were known as GILTI and, from 2026, as net CFC tested income. However, UK corporation tax often helps. The main UK rate is 25%, with a 19% rate for small profits, as HMRC's corporation tax rates show. Consequently, elections such as the high-tax exception can reduce or remove the US charge. The right choice depends on the figures, so we model it each year.

What your preparer needs from you

Preparing Form 5471 for a UK company needs more than the statutory accounts. Specifically, your preparer needs the trial balance, the corporation tax computation and the share register. Details of every payment between you and the company matter as well. That means salary, dividends, pension contributions and any director's loan. Furthermore, the first year needs the incorporation documents and the dates of each share issue. Sending these together saves weeks.

When is it due, and what if you miss it?

The form is due with your personal US return, including extensions, and the penalty for missing it is $10,000 for each form for each year. It is not a separate filing. Therefore, a return sent without it is incomplete, even if every figure on it is right.

The deadline

Americans abroad have an automatic extension to 15 June, and a further extension to 15 October on request. Form 5471 for a UK company travels with the return on whichever date applies. In practice, we recommend the October date for company owners, because UK year-end accounts often arrive late. Meanwhile, the company still files its own accounts and tax return in Britain, as GOV.UK explains in its guide to filing company accounts and a tax return.

The penalty and the open tax year

The penalty is $10,000 for each missing or incomplete form. If the IRS sends a notice and you do not file within 90 days, a further $10,000 applies for each 30 days, up to $50,000 more. In addition, your foreign tax credits can be cut by 10%.

The second cost is less visible. Under section 6501 of the Internal Revenue Code, the period the IRS has to assess your return does not start until the form is filed. Hence, a year you thought was closed can stay open indefinitely. Notably, the courts have disagreed on how the IRS may collect this penalty, so the point is unsettled. It is not a reason to skip the form.

Dormant and loss-making companies

A small, dormant or loss-making company does not escape. The duty depends on ownership, not on profit. However, the IRS allows a shortened filing for a company that is truly dormant. Therefore, tell your preparer if the company did nothing in the year, because the work is much lighter.

How do you fix missed years?

You fix missed years through a formal IRS catch-up route, not by quietly adding the form to this year's return. The usual route for founders living in Britain is the Streamlined Filing Compliance Procedures. Our guide to IRS Streamlined Filing explains who qualifies.

The streamlined route

Under the foreign version, you file or amend three years of returns, with each missing Form 5471 attached. You also file six years of FBARs and a signed statement that the failure was not wilful. Importantly, qualifying filers who live abroad pay no penalty. A company bank account that you can sign on is reportable too, as the IRS guidance on the FBAR confirms.

Why quiet filing is risky

Some founders simply attach Form 5471 for a UK company to the next return and say nothing about earlier years. However, that leaves each missed year exposed to its own $10,000 penalty. It also leaves those years open to assessment. Moreover, a first form showing a company that is several years old invites the obvious question. Therefore, a formal route is safer than a quiet start.

An illustrative example

Consider a typical case. Sam is a US citizen in Bristol who formed a software company in 2023 and owns all the shares. His UK accountant files the accounts and the corporation tax return each year. Sam files his own US return but has never attached Form 5471 for a UK company.

Three years are missing, so the penalty exposure is $30,000 before any US tax. However, Sam has lived in Britain throughout and did not know of the form. He therefore uses the Streamlined procedures. Three returns are amended with the forms attached, and six years of FBARs include the company account. He pays no penalty, and the open years start to close.

How US UK Tax Experts can help

We prepare Form 5471 for a UK company alongside the owner's US return and UK Self Assessment. First, we confirm your categories and the schedules they require. Next, we restate the UK accounts and convert them into dollars. We then run the figures for the available elections before anything is filed. In addition, we check that salary, dividends and loans appear consistently on both sides.

Our business and corporate tax service covers company owners. Furthermore, where earlier years are missing, our streamlined filing service handles the catch-up submission.

Conclusion

In summary, Form 5471 for a UK company is an annual duty for almost every American who owns or controls a British limited company. It reports the company's accounts in US terms and travels with your personal return. The form raises no tax by itself. However, a missed year costs $10,000 and keeps your return open.

Therefore, identify your categories, file the form every year and correct any missed years through a formal route. Ultimately, the form is far cheaper to prepare on time than to repair later.

Contact us

Do you own a British company and need Form 5471 for a UK company prepared, or are you unsure whether you should have filed it? Email us at hello@usuktaxexperts.com. Alternatively, send a short description of your situation through our contact page. We reply within one working day with the filings that apply and the dates that matter.