Owning a UK Limited Company as an American: U.S. Tax Rules and Forms
If you are a U.S. citizen or green card holder who owns a UK limited company, the IRS treats that company as a foreign corporation, and your ownership creates U.S. reporting on top of your UK obligations. If you own 10% or more, you almost certainly file Form 5471 with your U.S. return. But, if U.S. owners hold more than 50%, the company is a controlled foreign corporation (CFC), and you may owe U.S. tax on its profits even if you take no money out that year. The good news: a few well-chosen elections usually reduce or eliminate any double tax, and many owners end up owing little or nothing to the IRS once UK corporation tax is credited.
A few things that shape your US bill:
- Ownership percentage: 10% or more triggers Form 5471; more than 50% U.S. ownership makes the company a CFC.
- CFC income rules: GILTI (renamed NCTI for 2026) can tax undistributed profits.
- UK corporation tax paid at 19%-25% usually offsets the U.S. charge.
- Elections you make: the Section 962 election, the high-tax exclusion, and the check-the-box each change the result.
Below, we walk through the classification, forms, CFC rules, and elections that keep you compliant without paying twice. Whether you already run a UK company or are still deciding how to set up, the sections ahead also weigh the sole-trader alternative and why a U.S. LLC rarely fits a UK resident. Filing is one piece of the bigger picture in our guide to living in the UK as an American.
A UK Limited Company Is a Foreign Corporation to the IRS
In the UK, your company is registered with Companies House and treated as its own legal entity, paying UK corporation tax on its profits. The IRS also treats it as separate from you, but labels it a foreign corporation. That label is what creates your extra U.S. work: as the American owner, you have to report the company to the IRS every year, even though it is a UK business earning UK income.
The reporting flows from your U.S. shareholder status, not from where you live or where the company trades. A UK-based company earning only UK income, owned by an American in London, is still a foreign corporation that the IRS expects to see disclosed. Ownership, control, and the company’s income all feed into which forms you file and whether any U.S. tax is due before you distribute a penny. For the full landscape of forms across entity types, see our foreign business tax reporting guide.
UK Corporation Tax Applies Before Any U.S. Tax
Your company pays UK corporation tax on its profits first. For the 2025/26 UK tax year, the rates and thresholds published by HMRC are unchanged from prior years:
| UK taxable profit | Corporation tax treatment | Effective rate |
|---|---|---|
| Up to £50,000 | Small profits rate | 19% |
| £50,000 to £250,000 | Main rate with marginal relief | Rises from 19% toward 25% |
| Above £250,000 | Main rate | 25% |
Marginal relief uses a fraction of 3/200 and produces an effective rate that peaks near 26.5% on the slice of profit inside the band. Thresholds are shared among associated companies and prorated for accounting periods shorter than 12 months.
This UK tax matters for your U.S. return because it is the foreign tax you can credit or exclude. Since UK rates of 19% to 25% sit above the U.S. high-tax threshold of 18.9%, most American-owned UK companies can shelter their retained profits from a second U.S. charge, which we cover below.
Own a UK company and unsure what the IRS expects?
Form 5471 Is the Core U.S. Filing for American Owners
Form 5471 reports your interest in the foreign corporation: ownership, income statement, balance sheet, and related-party transactions. Which schedules you complete depends on your filer category. Most American owners of a UK limited company fall into Category 4, Category 5, or both.
| Filer category | Who it covers | Typical UK owner |
|---|---|---|
| Category 3 | Acquired or disposed of a 10%+ stake this year | Year you set up or sold shares |
| Category 4 | Control (more than 50%) for 30+ days | Sole or majority owner |
| Category 5 | 10%+ shareholder of a CFC for 30+ days | Any American in a U.S.-controlled company |
The stakes are high. The penalty for a late, missing, or incomplete Form 5471 starts at $10,000 per form, per year, and can climb to $60,000 for continued failure after IRS notice, and can reduce your foreign tax credits. Form 5471 attaches to your Form 1040 and follows the same deadline, including the automatic June 15 date for Americans abroad and October 15 with an extension.
Our Form 5471 guide breaks down the schedules category by category.
CFC Status Can Tax You on Profits You Never Withdrew
If U.S. persons who each own at least 10% together hold more than 50% of your company, it is a controlled foreign corporation. A single American owner of a UK limited company almost always creates a CFC on their own.
CFC status matters because of the tested-income rules. Under the regime long known as GILTI, a 10%-or-more U.S. shareholder includes a share of the company’s active profits in personal income each year, whether or not the company pays a dividend. Without a planning election, an individual is taxed at ordinary rates up to 37% and cannot credit the UK corporation tax against that charge, which is where double taxation creeps in.
The rules changed for tax years beginning after December 31, 2025. The 2025 law, commonly called the One Big Beautiful Bill, renamed GILTI to Net CFC Tested Income (NCTI) and adjusted the math:
| Feature | GILTI (2025 tax year) | NCTI (2026 onward) |
|---|---|---|
| Section 250 deduction | 50% | 40% |
| Effective corporate-level rate | 10.5% | 12.6% |
| QBAI (tangible-asset) offset | 10% exclusion | Eliminated |
| Indirect foreign tax credit allowed | 80% | 90% |
Both figures assume the corporate-level path (a C corporation or an individual who makes the Section 962 election). For the current-year detail, see our NCTI guide and GILTI and Form 8992 explainer. The practical takeaway is the same before and after the change: a UK company paying 19% to 25% corporation tax usually has enough foreign tax to wipe out the U.S. charge, once you choose the right election.
Elections That Prevent Double Taxation
Three elections do most of the heavy lifting. None is automatically better; the right one depends on your income, whether you claim the Foreign Earned Income Exclusion or the Foreign Tax Credit, and your long-term plans for the company.
- The high-tax exclusion. If your company’s foreign effective tax rate exceeds 18.9% (90% of the 21% U.S. corporate rate), you can elect to exclude its tested income from your U.S. tax entirely under current Treasury regulations. UK corporation tax at 19% to 25% typically clears this bar, so many owners deduct the retained profits from U.S. tax and simply file Form 5471 to report them.
- The Section 962 election. This allows an individual to be taxed on tested income as if they were a C corporation: at the 21% corporate rate, with the Section 250 deduction and an indirect credit for the UK corporation tax the company paid. It often reduces the U.S. charge to zero for a UK company, though subsequent dividends may incur a second layer of tax. Our Section 250 deduction overview explains how the deduction feeds this path.
- Check-the-box (the disregarded-entity route). A single U.S. owner can file Form 8832 to treat the company as a disregarded entity. That removes CFC status, replaces Form 5471 with Form 8858, and reports income on Schedule C. The elective path can simplify filing, but it triggers a deemed liquidation on the day it takes effect and leaves the company still taxed as opaque in the UK, which can create a hybrid mismatch. It is a real option, not a default; weigh it deliberately.
Here is how the three paths compare at a glance:
| Election | What it does | Best when |
|---|---|---|
| High-tax exclusion | Removes the company’s tested income from your U.S. tax entirely | The UK effective rate clears 18.9%, which covers most UK companies |
| Section 962 | Taxes tested income at the 21% corporate rate with a credit for UK tax | You want the credit without disregarding the company |
| Check-the-box (Form 8832) | Treats the company as disregarded, ending CFC status | A single owner who wants Schedule C simplicity, despite a deemed liquidation |
Salary Versus Dividends Changes Both Your UK and U.S. Bills
How you pay yourself affects both sides. In the UK, salary is deductible for corporation tax but is subject to income tax and National Insurance; dividends come from post-tax profits and carry no National Insurance. After a £500 dividend allowance, UK dividend tax applies at 8.75%, 33.75%, or 39.35%, depending on your income band, which is why many owner-directors blend a modest salary with dividends.
On the U.S. side, salary is foreign-earned income that the FEIE can exclude up to $130,000 (2025) or $132,900 (2026), while dividends are unearned income that the FEIE never covers. A common pattern is a modest salary covered by the exclusion plus dividends managed through the foreign tax credit. Because National Insurance interacts with the U.S.-UK totalization agreement, an owner-director usually pays into one social security system, not both.
How a Bristol E-commerce Owner Ends Up Owing No U.S. Tax
Daniel is an American in Bristol who runs an online store through a UK limited company. In 2025/26, the company earns £150,000 in profit, most of which he reinvests in inventory rather than paying himself.
- UK corporation tax: £150,000 sits in the marginal band, so the company pays roughly £36,000 (about a 24% effective rate) after marginal relief.
- How Daniel pays himself: a £12,570 salary plus a small dividend, leaving the rest in the business as stock.
- The trap the CFC rules create: even though Daniel took little cash out, his share of the company’s profit is tested income the IRS could tax this year.
- Why he owes no U.S. tax: because the company’s 24% effective rate exceeds the 18.9% high-tax threshold, Daniel elects the high-tax exclusion, so the reinvested profit is not taxed again in the U.S. He still files Form 5471, and his salary (roughly $16,000) is covered by the FEIE.
Daniel’s result is the common one: full U.S. compliance and little or no additional U.S. tax, because UK corporation tax has already done the work. The value is in filing the right forms and making the right election, not in a surprise bill on money he never took home.
Sole Trader or Limited Company Is a Different Decision
If you have not incorporated yet, the choice between operating as a sole trader and forming a limited company changes your entire filing picture. A sole trader reports business profit directly and deals with self-employment tax questions rather than CFC rules. That path is covered in our guide to being self-employed in the UK as an American; this page picks up once you have chosen the incorporated route.
A U.S. LLC Is Usually the Wrong Structure for a UK Resident
If you are living in the UK and considering running your business through a U.S. LLC rather than a UK limited company, pause first. The two countries classify LLCs differently: the IRS treats a single-member LLC as transparent (its income flows straight to you), while HMRC generally treats a U.S. LLC as opaque, taxing you on distributions as if they were dividends. Because the UK and the U.S. tax different things, HMRC has historically declined to give credit for the U.S. tax, and the combined effective rate can reach as high as 75%.
The UK government has opened a consultation on reforming this treatment for UK-resident members of U.S. LLCs and similar reverse-hybrid entities, aimed squarely at the mismatch. Its preferred option would allow UK residents to treat the LLC transparently, matching the U.S. approach and removing the double tax. The consultation closes on 31 July 2026, and no reform is law yet, so the risk remains live. If you are choosing a structure, this is exactly the kind of decision to model before you incorporate rather than after.
How Greenback Can Help
Owning a UK limited company puts you in one of the more demanding corners of the U.S. tax code, and the elections that protect you are easy to miss and costly to get wrong. Our accountants prepare the UK and U.S. sides together, so your Form 5471, CFC election, and UK corporation tax return align rather than conflict.
If you are a business owner weighing how to structure or file, we can model the options before you commit and handle the annual filing after. Learn more about how we support Americans who own businesses abroad.
Get a UK company filed right on both sides.
Frequently Asked Questions
The IRS treats it as a foreign corporation. If you own 10% or more, you report it on Form 5471, and if you control it, its profits can be taxed to you each year under the CFC rules. UK corporation tax is usually offset against the U.S. charge through the high-tax exclusion or a Section 962 election.
Usually, yes. Form 5471 is an information return tied to your ownership and control, not to whether the company was profitable. A dormant or loss-making UK limited company owned by a U.S. person generally still requires the form, and the penalties for skipping it apply regardless of profit.
You may have a U.S. inclusion under the CFC rules, but you often owe nothing after applying UK corporation tax. Because UK rates of 19% to 25% exceed the 18.9% high-tax threshold, most owners use the high-tax exclusion or the Section 962 election to reduce the U.S. charge on retained profits to zero.
Yes. A company owned entirely by a single American is controlled by a U.S. shareholder, making it a controlled foreign corporation. You would generally be a Category 4 and Category 5 filer on Form 5471.
For a UK resident, a U.S. LLC often creates double taxation because HMRC and the IRS classify it differently. A UK limited company is usually the cleaner structure, though the right answer depends on your facts, so model it before you form the entity.
If the account balance crosses the reporting threshold and you have signature authority or a financial interest, yes. Business accounts can trigger both the FBAR and Form 8938, which are filed alongside your corporate filings.
Ready to Get the Structure Right
You do not have to reconcile two tax systems on your own. Whether you are setting up a UK company this year or catching up on filings you did not know you owed, our team can map the elections to your situation and file both sides correctly, so the U.S. and UK returns finally agree.
Start with a team that prepares UK and U.S. business taxes together and knows how to keep a UK limited company from being taxed twice.
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This article is for informational purposes only and does not constitute tax or legal advice. Tax rules for foreign corporations, CFCs, and cross-border structures are complex and depend on your specific facts. Please consult a qualified tax professional with expertise in U.S. and UK tax before acting on any information here.
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