Incorporate, or stay as you are? The American version of the question

It is a separate legal person. It owns its own profits and pays its own corporation tax. You take money out by salary, dividend or loan, and each route carries its own charge.

That separateness is the whole point of a UK limited company in Britain. American rules refuse to respect it by default.

So the same structure looks like a shield on one side of the Atlantic and a reporting obligation on the other.

Because the headline rates differ. A company pays a small profits rate on modest profits, and a main rate above an upper limit. Marginal relief sits between the two. A sole trader pays income tax at 20%, 40% or 45%, with National Insurance on top.

Dividends then carry their own rates, lower than earnings.

The GOV.UK guidance on Corporation Tax rates sets out the limits that decide which rate applies.

They rose for 2026/27, and that matters to anyone whose plan depended on them. Dividends now carry 10.75% at the basic rate, 35.75% at the higher rate and 39.35% at the additional rate, after a £500 allowance.

Two of those three rates moved by two points. The additional rate did not.

The GOV.UK page on tax on dividends carries the current table.

Run the comparison on the current table rather than a remembered one. A two-point move on a £40,000 dividend is £800, every year.

Three things, and only one of them is tax. First, an annual information return about the company. It turns on who owns and controls it, not on what it earned.

Second, a current charge on profit you leave inside the company. Third, more work in every year that follows, whatever the company earns.

None of that appears in a British spreadsheet. Yet each one attaches to the UK limited company you were told to set up.

Our clients are usually comfortable with the tax and unprepared for the paperwork.

Where the company stays a corporation for American purposes, yes. An American who controls a foreign company files an information return every year, whether the company traded, sat dormant or lost money. The penalty regime starts at five figures per company per year.

The form is Form 5471, and it travels with your personal return.

So a dormant company you forgot about is more expensive than a trading one you remembered.

Filing it late is worse than filing it plainly. The penalty attaches to the absence of the form, not to the quality of the numbers inside it.

Largely, no. Where Americans control the company, its tested income is taxed to the shareholders as it arises rather than when it is paid out. Leaving money in the business no longer postpones the American charge, which removes the main reason many people incorporate.

British corporation tax often absorbs much of it, through credits.

Reaching those credits as an individual generally needs an election, and our note on avoiding double taxation sets out the wider relief machinery.

Not necessarily, and this is the most useful fact in the whole article. American regulations name the public limited company as the British entity that is automatically a corporation. An ordinary private company limited by shares sits outside that list, so its owner can choose.

Electing disregarded treatment collapses the company into you for American purposes.

The election runs on Form 8832.

Simplicity, mostly. A disregarded company produces no controlled foreign corporation, no annual information return about it and no separate inclusion, because the company has stopped existing on the American side. Profits land on your own return as they arise, with British tax available as a credit.

What you give up is deferral, which the current-inclusion rules had already weakened.

The choice also sticks. A change of classification is generally locked for five years.

You file Self Assessment in Britain and a business schedule in America, on the same profits. Credits line the two up. There is no company, so no company reporting, no election and no question about retained profit.

American self-employment tax would normally follow, and the totalisation agreement usually prevents it where you pay British National Insurance.

We set out the certificate process in the totalisation agreement.

The trade-off is liability and perception. Some clients still prefer to contract with a company, and no tax argument answers that.

More than the British side, in most small cases. Britain wants statutory accounts and a corporation tax return, both largely mechanical once the bookkeeping is done. America wants the same results rebuilt under its own rules, plus a translation you can defend.

That rebuild is the part people underestimate. Earnings and profits is an American concept, and no British accountant computes it.

Budget for it annually, not once. It does not get much cheaper after year one.

When something other than tax is doing the work. Clients who insist on invoicing a company, liability you want ringfenced behind a corporate veil, or a partner joining the business within a year or two. Each of those settles the question on its own terms, before any rate comparison starts.

A business that must hold real capital to grow points the same way. So does a contract that names a company as the supplier.

Pure rate arbitrage is the weakest reason to hold a UK limited company once American rules apply.

In our practice the strongest cases are commercial rather than fiscal.

It matters twice. Britain divides the corporation tax limits by the number of associated companies. So a second one can push the first into a higher rate band. American reporting is per company, so each one carries its own annual return and its own penalty exposure.

Holding structures therefore cost more than people assume.

One company doing everything is usually cheaper than three doing one thing each.

So park the second idea inside the first company where you sensibly can. Splitting it out is a decision with an annual cost attached.

That decision sits downstream of this one. It changes once you run a UK limited company as an American. Salary reduces company profit, so it shrinks what the current-inclusion rules reach. Dividends do not, and they now carry higher British rates than they did.

Employer National Insurance runs at 15% above a low threshold.

So the efficient British mix is not always the efficient cross-border mix.

You can, slowly and at a price. Britain lets you incorporate an existing trade or wind a company up, and both routes carry their own tax consequences. America locks a classification election for five years, so the American side moves far more slowly than the British one.

Winding up brings its own questions about the final distribution.

So treat this as a five-year decision rather than an annual one.

Work through these in order. The commercial questions come first, because they can settle the matter before any tax arithmetic starts.

It changes the control question, and sometimes the whole answer. Where a non-American spouse genuinely owns half the shares and the voting rights, the company may fall outside American control, which removes the current inclusion.

Attribution rules make this far harder than it sounds. Shares held by a spouse can count as yours.

We see this arrangement suggested often and structured properly rarely, so take advice before relying on it.

Take an American designer in Leeds making £70,000 of profit and drawing nearly all of it. British advice alone might favour a company. She retains almost nothing, so deferral is worth little to her.

Against that, she would pick up an annual information return, American accounts and an election to think about.

Staying unincorporated keeps her filing simple and her British National Insurance covering her American position. This example is illustrative, not advice, and her answer would turn on her full circumstances.

First, forming a UK limited company on British advice alone, then meeting the American side a year later.

Second, assuming money left in the company is money the IRS has not seen.

Third, treating the classification election as a formality. It is the most consequential decision in the file.

Fourth, setting up a second company for a side project without checking what it does to the first company's rate band.

Fifth, assuming the British year end will suit the American return. A March year end reports a period no American form was built around.

We price both routes on your own numbers, British and American together, before anything is registered. Where a company already exists, we look at the classification question first, because it governs everything downstream.

That work sits alongside our treaty relief service, and our note on one business, two sets of accounts covers the unincorporated route in detail.

This article is general information, not personal tax advice. Talk to us about your own position.