Setting up a British company when the IRS owns a share of your thinking

It is a separate legal person, registered at Companies House, that owns its own profits and debts. You can be its director and its shareholder, yet the company remains distinct from you.

It pays corporation tax on its profits. You then pay personal tax on what you take out, whether as salary or dividends.

The GOV.UK guide to company formation covers registration. Britain treats the company as the taxpayer, which is exactly where the American difficulty begins.

Shareholdings matter more than they look. Who owns the shares, and in what proportions, drives much of the American analysis later.

Three reasons come up repeatedly, and all of them have merit. Clients often prefer contracting with a company, limited liability protects personal assets, and splitting income between salary and dividends can cut British tax.

Those arguments are real, and British advisers make them for good reason. They are also made without reference to a second tax system.

In our practice we see Americans incorporate on British advice alone, then meet the American consequences a year later. The structure is far easier to choose than to unwind.

Some clients also insist on it. Where that is the real driver, price the American cost into your rates rather than absorbing it.

A foreign corporation that you probably control, rather than a British convenience. Where US shareholders hold more than half of it, the company counts as a controlled foreign corporation for American purposes.

That status brings annual reporting. The IRS page for Form 5471 explains that certain US citizens who are officers, directors or shareholders in certain foreign corporations must file it.

The form runs to several schedules. It asks for the company's accounts, its share capital, its transactions with you, and more besides.

Yes, and that is the part most people find hardest to believe. American rules can tax a shareholder on certain company income as it arises, rather than waiting for a dividend.

The regime introduced in 2017, and renamed for years from 2026, reaches a wide range of ordinary trading profits. Older rules on passive income can apply too.

So money you deliberately left in the company to grow it can still create a personal American tax bill. That surprises anyone used to how the British system waits.

Not automatically, because two different taxpayers sit on either side of the Atlantic. The company pays the British corporation tax, while you pay any American tax personally, and the two do not meet cleanly.

Elections exist that can change how you work out the American charge, and some bring company-level tax into the picture. They need modelling on your own numbers rather than a general rule.

This mismatch is the single biggest reason a UK limited company costs an American more than it costs a British neighbour. Our guide to avoiding double taxation explains how credits usually work.

Most British owners take a small salary and draw the rest as dividends. That mix keeps National Insurance down, and it is the standard advice an accountant here will give you.

The American side treats the two differently again. Salary counts as earned income, so it can support the foreign earned income exclusion. Dividends cannot.

So the British optimum and the American optimum rarely match. Our guide to National Insurance for Americans covers the contribution side of that choice.

More than a sole trader has, and they run on their own timetable. The company files annual accounts and a company tax return, and it confirms its details to Companies House once a year.

Corporation tax is due on a different timetable from personal tax, and the GOV.UK corporation tax rates page sets out the current rates.

You still file a personal return as well, covering salary, dividends and anything else. So incorporation adds filings rather than replacing them.

Directors carry duties of their own as well. Filing late attracts penalties for the company, and the register is public, so mistakes are visible.

It can, in the right case, though it is not a universal fix. American rules let you treat certain foreign entities as transparent, so the profits flow through to you rather than sitting in a corporation.

Where that election applies, the reporting changes and a different form often takes over. The IRS page for Form 8858 covers foreign disregarded entities.

Whether it helps depends on your numbers and your plans. Take advice before electing, because the choice is not freely reversible.

Closing one is considerably more involved than opening it. Britain has procedures for striking off a solvent company and for a formal liquidation, each with its own conditions, timetable and costs.

The American side looks at what you receive when the company winds up. That can produce a taxable event on your personal return, sometimes a large one.

So plan the exit before you incorporate, not afterwards. A company set up for a two-year contract can take longer than that to unwind.

The bank accounts might, through the foreign account rules. Where you have signature authority over a company account, that authority can bring it inside the reporting even when the money is not yours.

Our guide to Form 8938 and the FBAR sets out the two regimes. They run on balances and access rather than on profit.

Add the company accounts to your annual list from the day they open. Retrofitting years of balances is slow work.

Usually, for an American without a strong commercial reason to incorporate. There is no foreign corporation to report, so the American side is a Schedule C rather than a set of company filings.

There is also no mismatch between company tax and personal tax, because only one taxpayer exists. Each country taxes the profit once, with credits doing their ordinary work between them.

Our guide to registering for Self Assessment covers that route. Many contractors move to it once they see the two sets of costs side by side.

You can incorporate later if the business grows. Starting simple keeps that option open, while starting with a company is harder to reverse.

It brings its own mismatch, running in the opposite direction. America often treats an LLC as transparent, while Britain may treat exactly the same entity as a company for tax purposes.

That disagreement can leave income taxed in both countries with no clean credit between them. It is a known trap for people who move to Britain still owning one.

So an LLC is rarely the easy answer for a UK-based owner. Take advice before assuming the American structure travels.

Budget for two sets of professional fees rather than one, and plan for the second to surprise you. British accounts and a company tax return sit alongside American reporting that most domestic US preparers rarely handle.

The American side usually costs more, because the forms run long and every figure needs converting. A modest trading company can still generate a substantial return.

Compare that total against the British tax saving before deciding. The saving is real, and so is the cost.

Not your right to work, which follows your visa rather than your company. Directing a British company creates no permission to work here, and the two systems ask entirely separate questions.

Banking can be slower than expected. British banks ask US persons detailed questions under international reporting rules, and account opening can take weeks rather than days.

Allow for that delay in your plans. A company with no bank account cannot invoice, and clients rarely wait.

Work through this before registering anything. Every step is cheaper now than after the first year of trading.

Keep the analysis, since it explains your structure to any adviser who joins later.

Take an illustrative example: a British accountant advises an American consultant in Leeds to incorporate. Dividends, he says, will save her several thousand pounds a year.

The advice is correct as far as British tax goes. On the American side, the company brings annual reporting. Profits she leaves inside it can also reach her personal return before she draws them.

Once both bills are on the table, she keeps trading as a sole trader for another year. The decision changes if her profits grow or she takes on staff.

The first is incorporating on British advice alone. The structure is sound here and expensive across the Atlantic.

The second is assuming undrawn profits are invisible. American rules can tax them in your hands in the year they arise.

The third is leaving the company accounts off your foreign account list. Signature authority can be enough to bring them into the reporting.

The fourth is forgetting the exit. Winding a company up has its own cost and its own American consequences.

We model both structures before you register through our treaty relief service, pricing the British saving against the American cost. Where a company is right, we handle the reporting alongside both returns.

If someone has suggested a UK limited company, send us the numbers and we will show both sides at a fixed fee agreed first. This article is general information, not personal tax advice; take advice on your own facts from a qualified adviser.