Introduction: The Expansion Worker Visa Is a Tax Decision Before It Is an Immigration One
The Expansion Worker visa lets a senior person from an American business move to Britain to open its first UK branch or subsidiary, and it switches on UK corporation tax, UK payroll and UK personal tax at the same moment. Most guides to the Expansion Worker visa are written by immigration lawyers. They explain the sponsor licence, the salary floor and the two-year limit in detail. However, they say almost nothing about tax, and tax is where the money goes.
That silence matters most to owners. Since 2022, a majority shareholder can hold an Expansion Worker visa and lead the UK launch personally. Consequently, the founder of a profitable US company can now become a UK tax resident, a UK employee and the cause of a UK permanent establishment in a single flight. Furthermore, the Home Office asks the business to choose its UK legal form before it issues the licence, so the most important tax choice arrives first.
This guide follows the tax file from that first choice to the end of the Expansion Worker visa. It uses verified 2026 figures on both sides of the Atlantic. Additionally, it includes a worked case study with real numbers. TaxYork prepares the US and UK returns for owners and executives making this move, so the focus here is the tax position and not the visa form.
How the Expansion Worker Visa Works in 2026
The Expansion Worker visa in one paragraph
The Expansion Worker visa is a sponsored UK work route inside the Global Business Mobility category. It allows a senior manager or specialist employee of an overseas business to come to Britain and establish that business's first UK presence. The government's own UK Expansion Worker visa guidance is explicit that the business must not have started trading in the UK. If it already trades here, a different route applies. The Expansion Worker visa replaced the old Sole Representative visa in April 2022.
Who qualifies and what the job must pay
The official eligibility rules for the Expansion Worker visa set three tests that matter for tax. First, the job must pay at least £52,500 a year or the going rate for the occupation, whichever is higher. Second, the worker must normally have worked for the business outside the UK for at least 12 months. Third, that 12-month rule falls away for a high earner paid more than £73,900 a year.
The salary floor is the first tax fact. You cannot satisfy it with dividends, a profit share or an informal draw. Therefore, an owner who has taken little or no salary from an S corporation or an LLC must become a properly paid employee before the application. That salary is then fully taxable in Britain from the first day of UK work.
What it costs and how long it lasts
The application fee is £340, and the healthcare surcharge is usually £1,035 for each year of the stay. Each family member pays the same. The first grant lasts up to 12 months, and one extension takes the total to two years. Moreover, time on related Global Business Mobility routes is capped at five years in any six.
The route does not lead to settlement. You cannot apply for indefinite leave to remain from an Expansion Worker visa, and you cannot take a second job. As a result, every owner who intends to stay must plan a switch into another route before month 24. That switch has tax consequences of its own, which we cover near the end of this guide.
Owners can now apply, and that changes the tax picture
The old Sole Representative route barred anyone who owned or controlled a majority of the overseas business. The Expansion Worker visa carries no such bar. A founder who owns 100% of an American company can be its sponsored Expansion Worker, provided the expansion is genuine. In addition, the licence allows up to five workers at a time, so a founder can bring a small launch team.
This is welcome commercially. However, it places the person who makes every strategic decision for the US company in a London office for up to two years. Three separate tax questions follow from that single fact, and immigration guides address none of them. Does the company now have a UK permanent establishment? Has the company itself become UK resident? And which country taxes the owner?
Branch or Subsidiary: The Tax Choice the Sponsor Licence Forces First
Why the entity decision comes before the Expansion Worker visa
The employer needs a sponsor licence before anyone can apply. To obtain it, the Home Office expects evidence of a UK footprint, such as a registration at Companies House or a lease on premises. The sponsorship guidance for employers therefore pushes the business to register either a UK establishment of the US company or a new UK subsidiary before the visa stage.
Those two forms are taxed very differently in both countries. Consequently, a choice made to satisfy an immigration checklist fixes the corporate tax position for years. In our experience, most American owners make it in an afternoon, on the basis of filing fees. It deserves more care than that.
How Britain taxes a branch
A branch is not a separate company. It is the US company itself, operating in Britain through a permanent establishment. The UK charges corporation tax on the profits attributable to that establishment, calculated as if it were a separate enterprise dealing at arm's length with its head office. There is no further UK tax when the branch sends cash home, because Britain has no branch profits tax.
The rate is usually 25%. The corporation tax rates include a 19% small profits rate, but the statute reserves it for UK-resident companies. A treaty claim can open it to a branch. However, HMRC's manual on the small profits rate for non-residents measures the limits against the profits of the whole company worldwide. A US business earning several million dollars will therefore never qualify.
How Britain taxes a subsidiary
A UK private limited company is a separate UK taxpayer. It pays corporation tax on its own worldwide profits at 25%, or at 19% where profits stay under the lower limit. Nevertheless, that lower limit is smaller than it looks. The £50,000 and £250,000 limits are divided by the number of associated companies, and the US parent counts. A single parent and subsidiary therefore share limits of £25,000 and £125,000.
Dividends paid by the subsidiary to the US parent carry no UK withholding tax. In addition, a subsidiary ring-fences UK commercial liabilities in a way that a branch cannot. Those two points explain why British accountants usually recommend a subsidiary by default. The default ignores the American side.
How the United States taxes each structure
A branch of a US C corporation sits on the US corporate return. Its income and its losses flow straight into the federal computation, and the company reports the branch on Form 8858. UK corporation tax paid on branch profit becomes a direct foreign tax credit in the separate foreign branch category. Because 25% exceeds the 21% US rate, the credit normally removes the US tax on that profit entirely.
A UK subsidiary is a controlled foreign corporation. The parent files Form 5471 every year and includes the subsidiary's net CFC tested income, the regime formerly called GILTI. For 2026, a C corporation deducts 40% of that income and credits 90% of the UK tax. As a result, UK tax at 25% usually eliminates the US charge. Capital sent to the subsidiary also needs reporting, and a cash transfer above $100,000 triggers Form 926.
Owners of S corporations face a harder version of the same rule. The tested income flows to the individual shareholder, who receives no 40% deduction and no credit for UK corporation tax unless a section 962 election is made each year. In contrast, the same shareholder credits a branch's UK corporation tax directly. For pass-through owners, that difference alone can decide the structure.
Start-up losses are where the branch wins
New operations lose money. A UK launch typically carries a senior salary, two or three hires, an office and professional costs for a year or more before revenue arrives. Inside a subsidiary, those losses stay in Britain. They carry forward against future UK profits, and the US parent receives no deduction at all.
Inside a branch, the same losses reduce US taxable income immediately. On a £450,000 first-year loss, a profitable C corporation saves roughly $123,000 of federal tax at an exchange rate of $1.30. There is one condition. Under section 1503(d), a foreign branch loss is a dual consolidated loss. The company must therefore file a domestic use election and certify for five years that no other entity has used the loss against foreign income.
Checking the box, and the cost of changing later
American owners have a third option. An ordinary UK limited company is not on the IRS list of automatic corporations, so it can file Form 8832 and elect to be disregarded. Britain then sees a subsidiary with limited liability, while the United States sees a branch with deductible losses. The election must be made at formation or shortly after. Otherwise, a later election counts as a liquidation for US purposes.
Changing course later is expensive. If a US company deducts branch losses and then transfers the branch into a foreign corporation, section 91 pulls those losses back into income. Furthermore, the transfer can trigger recapture of the dual consolidated loss and a charge on any intangible property that moves. Hence the structure you register for the Expansion Worker visa should be the structure you intend to keep.
Permanent Establishment and Company Residence From Day One
A fixed place of business exists as soon as you open
The Expansion Worker visa exists to create a place of business in Britain. An office with a sponsored senior manager working in it is a fixed place of business, and nothing in the preparatory or auxiliary exemption protects a real launch. Our separate guide explains when a US company owes UK corporation tax through a permanent establishment in more depth.
The Expansion Worker visa requires that the business has not started trading in the UK. Immigration status and tax status are different tests. Therefore, a company can satisfy the Home Office that it is new to Britain and still owe corporation tax from the month its first customer contract is negotiated in London. Notably, the company must tell HMRC within three months of coming within the charge to corporation tax.
The 2026 dependent agent rule
Many American owners believe they avoid a UK taxable presence by signing every contract in the United States. That belief is out of date. The Finance Act 2026 rewrote the dependent agent test in section 1141 of the Corporation Tax Act 2010 for periods beginning on or after 1 January 2026. The test now catches a person who habitually plays the principal role leading to contracts that the company concludes without material change.
An owner on an Expansion Worker visa who negotiates UK deals is that person. Consequently, the place of signature no longer decides anything. For a company using a subsidiary, this matters too. If the founder sells the US parent's products from London instead of the subsidiary's, the parent can acquire its own UK permanent establishment alongside the subsidiary.
The residence risk that only owners carry
Britain treats a foreign-incorporated company as UK resident if its central management and control is exercised here. For a hired executive, that test is irrelevant, because the board sits in America. For a founder who is the board, it is a live risk. If the highest-level decisions about the US company are taken in a London flat for two years, HMRC can argue that the whole company is UK resident.
The consequence would be UK corporation tax on worldwide profits, not only on the branch. The US-UK treaty then sends the question to the two tax authorities to settle by agreement. Until they agree, the company can lose treaty benefits altogether. Therefore, founders should keep strategic decisions with a US board that meets in the United States, and they should minute those meetings carefully.
Registration, VAT and the dates that follow
A US company that opens a UK establishment must register it at Companies House within one month. It must then file accounts there each year. Meanwhile, directors and people who file for the company now need to verify their identity with Companies House. A subsidiary follows the ordinary incorporation process instead.
VAT follows separately. A business with a UK establishment registers once taxable turnover passes £90,000. In contrast, a business with no UK establishment has no threshold and registers from its first UK sale. Opening the branch can therefore improve the VAT position, which surprises many owners.
Payroll: PAYE, National Insurance and US Social Security
The Expansion Worker visa salary is UK employment income
The salary that earns the points is taxable in Britain. The holder of an Expansion Worker visa performs the duties here and usually becomes UK resident. Therefore, the short-stay exemption in Article 14 of the treaty does not help. It also fails for a second reason. That exemption disappears where the pay is borne by a permanent establishment that the employer has in the UK, which is exactly what the Expansion Worker visa creates.
Guaranteed allowances count towards the £52,500 floor. They are also taxable. Therefore, a housing allowance or a cost-of-living supplement that helps the application also raises the PAYE bill. Many employers gross up those items, and our guide to shadow payroll for US executives moving to Britain explains how that is run.
Operating PAYE from the first payday
Once the US company has a UK branch or subsidiary, it has a UK presence for payroll purposes. It must register as an employer with HMRC and report pay in real time on or before each payday. Staying on the US payroll is acceptable for immigration purposes. However, it does not remove the UK obligation, and HMRC collects unpaid PAYE from the employer with interest and penalties.
For 2026/27, UK income tax runs at 20%, 40% and 45%. The personal allowance of £12,570 tapers away between £100,000 and £125,140 of income. A senior employee on an Expansion Worker visa therefore pays an effective 60% rate on that slice. An employee on £160,000 pays UK income tax of £58,203 for a full year.
The certificate of coverage that saves five figures
National Insurance is the largest avoidable cost of an Expansion Worker visa. Without planning, the UK employer pays 15% on salary above £5,000, and the employee pays 8% up to £50,270 and 2% above. On a £160,000 salary, that is £23,250 for the employer and £5,211 for the employee every year.
The US-UK social security agreement removes both charges for a temporary assignment. Under the detached worker rule, an employee sent by a US employer to Britain for five years or less stays in the US system alone. The US employer requests a certificate of coverage from the Social Security Administration, and the UK payroll then applies no National Insurance. An Expansion Worker visa lasts two years, so it fits comfortably inside the limit.
Three conditions deserve attention. First, the worker must remain employed by the US company or its affiliate under a US employment relationship. Second, the certificate must exist before HMRC asks for it. Third, US social security and Medicare tax continue on the full salary. Our guide to US-UK social security totalization covers the process in detail.
US withholding does not need to run twice
American employers often keep withholding federal income tax after an Expansion Worker visa is granted. That leaves the employee funding two countries at once. The law does not require it. Wages paid to a US citizen for services abroad are exempt from federal income tax withholding where the employer must withhold foreign income tax on the same pay. The exemption covers income tax only, and FICA contributions continue under the certificate.
The employee still files a US return and settles the final position there. Nevertheless, removing double withholding at source protects monthly cash flow for two years. It also avoids a large refund claim that takes months to arrive.
Your Personal Tax as the Expansion Worker
UK residence starts quickly
HMRC decides residence under the Statutory Residence Test. A person who starts full-time work in the UK for a continuous period of at least 365 days is generally resident from the start of that work. Split-year treatment then divides the tax year of arrival into an overseas part and a UK part. Therefore, income earned before the move normally stays outside UK tax.
You must claim split-year treatment on a Self Assessment return. It is not automatic. Furthermore, an Expansion Worker visa holder with a home in both countries must check the detailed conditions, because the relevant case depends on when the UK home became available.
The four-year foreign income and gains regime
A new arrival who was not UK resident in any of the previous ten tax years can claim the four-year foreign income and gains regime. During those four tax years, foreign income and gains are free of UK tax, even when brought to Britain. The claim costs the personal allowance and the capital gains annual exemption, although a high earner has already lost the first of those.
For an American owner, this relief is worth more than it first appears. Britain treats an S corporation as an ordinary company. It therefore taxes distributions as dividends at up to 39.35%, while the United States taxes the underlying profit in a different year. Credits rarely match. The regime switches that mismatch off for four tax years, which comfortably covers a two-year Expansion Worker visa.
Overseas Workday Relief for duties performed in America
Founders travel. A qualifying new resident can also claim Overseas Workday Relief on earnings for days worked outside the UK. Since April 2025, the relief no longer requires the pay to stay offshore. It is capped each year at the lower of 30% of qualifying employment income and £300,000.
The relief moves tax from Britain to the United States; it does not delete it. Wages for days worked in America are US-source income, so the IRS taxes them without a UK credit. Nevertheless, a 45% UK rate falls to a US marginal rate of 24% or 32%. We explain the mechanics in our guide to Overseas Workday Relief for US executives.
The US return: foreign tax credit or exclusion
A US citizen or green card holder files Form 1040 every year, wherever they live. Two reliefs prevent double taxation on the salary. The foreign earned income exclusion removes up to $132,900 of 2026 earnings from US tax. Alternatively, the foreign tax credit offsets US tax with UK income tax actually paid.
For a senior Expansion Worker visa holder, the credit usually wins. UK tax on a six-figure salary exceeds the US tax on the same income, so the credit eliminates the US liability and leaves a surplus to carry forward for ten years. In contrast, the exclusion wastes that surplus and blocks certain other reliefs. Our team prepares US tax returns for Americans in Britain on both bases before recommending the filing position.
Housing, travel and the two clocks
Britain allows tax-free reimbursement of travel and accommodation at a temporary workplace. The test is whether the assignment is expected to last no more than 24 months. HMRC's guidance on secondments to the UK confirms that reasonable accommodation costs qualify. A two-year Expansion Worker visa therefore sits right on the line, and an intention to stay longer breaks the relief from the day that intention forms.
The United States runs a shorter clock. An assignment realistically expected to exceed one year is indefinite from the first day. Consequently, the same employer-paid London flat is tax-free in Britain and taxable wages on the US return. Surplus foreign tax credits often absorb the US charge. Still, the payroll must report the benefit correctly, as our guide to detached duty relief for US executives explains.
Keeping the 401(k) going
An employee on an Expansion Worker visa usually stays in the US retirement plan. The US-UK treaty allows Britain to give tax relief for contributions to a US plan where the employee joined it before starting work here. The plan must correspond to a UK registered scheme, and UK limits apply. The current US-UK treaty documents set out the conditions in Article 18.
This relief is not applied automatically through PAYE. Therefore, the employer should agree the treatment with HMRC early, or the employee pays UK tax on employer contributions that the US treats as tax-free. That mismatch is difficult to repair after the year ends.
The Reporting That Gets Missed
Missed FBAR filings on business accounts
Opening a UK business bank account creates two US reports, not one. The company reports its own account. Separately, any US person who can sign on that account has signature authority and files a personal Report of Foreign Bank and Financial Accounts once foreign accounts exceed $10,000 in aggregate. Founders routinely miss this second filing because the money is not theirs.
A missed FBAR is a common result of a first year on an Expansion Worker visa, and it is straightforward to correct when addressed early. A personal UK current account and a rental deposit account count towards the same $10,000 total. In addition, specified foreign financial assets above $200,000 at the year end belong on Form 8938 for a single filer living abroad. Our FBAR and FATCA reporting service covers both.
Company forms with fixed penalties
The entity forms carry their own penalties. A late or missing Form 5471 for a UK subsidiary costs $10,000 for each year. Form 8858 for a branch or a disregarded company carries the same figure. Moreover, an incomplete Form 5471 can keep the whole US return open to IRS examination indefinitely.
These penalties apply even when no US tax is due. That point catches profitable companies whose UK operation made a loss. Accordingly, the first US return after the launch should include the new forms, the entity election if one was made, and the dual consolidated loss election where a branch loss is claimed.
UK returns for the individual
PAYE does not finish the UK position for an Expansion Worker visa holder. A split-year claim, a foreign income and gains claim and an Overseas Workday Relief claim all require a Self Assessment return with the residence pages. The return is due by 31 January after the tax year ends. Missed UK tax returns in the arrival year are common, because the employee assumes payroll has dealt with everything.
Illustrative Case Study: A Texas Founder Opens in London
The starting position
Sarah is a US citizen who owns 100% of a software company in Austin. The business is a C corporation earning $6 million a year before tax. She decides to lead the UK launch herself on an Expansion Worker visa for 24 months. Her salary is £160,000, which is $208,000 at an illustrative rate of $1.30. She expects the UK operation to lose £450,000 in its first year, covering her pay, two hires and an office.
The structure she nearly chose
Her immigration adviser needed a UK footprint for the licence and suggested a new UK limited company. Under that plan, the £450,000 loss would stay inside the subsidiary. It would carry forward in Britain, and the US company would receive no deduction. Additionally, payroll would have run with full National Insurance, because nobody had mentioned a certificate of coverage.
The annual cost of that default was clear once we set it out. National Insurance alone would have been £23,250 for the company and £5,211 for Sarah, a total of £28,461 a year. Over the two-year Expansion Worker visa, that is £56,922 paid into a system from which she would draw almost nothing.
What was done instead
The company registered a UK establishment and kept a single legal entity. It filed the domestic use election for the first-year loss. As a result, the £450,000 loss, worth $585,000, reduced US taxable income and saved about $122,850 of federal tax in year one. The same loss still carries forward against future UK branch profits.
The company then obtained a certificate of coverage before the first UK payday. Sarah's pay stayed subject to US social security and Medicare, which she would have paid at home in any event. UK National Insurance fell to nil on both sides. Furthermore, the board adopted a protocol that keeps strategic decisions in Austin, so the company's residence stays American.
Sarah's own returns
Sarah pays UK income tax of £58,203 on her salary, or about $75,664. Her US federal tax on the same income is roughly $38,700. The foreign tax credit therefore removes her US liability, and about $37,000 of surplus credit carries forward. She also claims the four-year foreign income and gains regime, so dividends from her US investment portfolio stay outside UK tax.
She spends 40 working days a year in Austin. Overseas Workday Relief removes about £27,800 of salary from UK tax, a saving of roughly £12,500 at 45%. The IRS taxes that slice at 24%, so the net gain is close to half the UK saving. Finally, she files her own FBAR for signature authority over the branch account, a filing she had not known existed.
The result
In the first year, the branch structure and the certificate together improved the group's cash position by more than $159,000 against the default plan. None of the saving came from aggressive planning. It came from making the tax decisions in the right order, before the sponsor licence for the Expansion Worker visa fixed the structure.
After Two Years: Switching Route and What Changes
The move to Skilled Worker status
An Expansion Worker visa ends at 24 months. An owner who wishes to stay normally switches to the Skilled Worker route, sponsored by the UK operation once it is trading. That route can lead to settlement, and our guide to indefinite leave to remain for Americans explains the tax position at that stage.
The switch changes the facts on which several reliefs depend. Therefore, it should be modelled as a tax event and not only as an immigration filing. The key question is when the intention to stay became realistic, because British and American rules both test expectation and not hindsight.
Reliefs that end or begin to expire
The 24-month temporary workplace relief ends as soon as a longer stay is expected. From that date, employer-paid housing becomes taxable pay in Britain as well as in America. Similarly, the certificate of coverage has a five-year limit, after which UK National Insurance starts and US social security stops.
The foreign income and gains regime ends after the fourth tax year of residence. From year five, Britain taxes worldwide income and gains as they arise. An American owner then faces UK tax on US dividends, US gains and distributions from the US company. Consequently, extraction and restructuring decisions belong inside the four-year window, not after it.
When a branch should become a subsidiary
A profitable UK operation with local staff and customers often outgrows the branch form. Converting it is possible, but section 91 and the dual consolidated loss rules can reverse the US benefit of the early losses. Therefore, the conversion should be costed before it is announced. In some cases, a disregarded UK limited company formed at the start avoids the problem entirely.
How TaxYork Can Help
TaxYork provides comprehensive US and UK tax preparation and compliance for company owners, executives and their families. We prepare both countries' returns for people arriving on an Expansion Worker visa, including split-year claims, foreign income and gains claims and Overseas Workday Relief computations. Additionally, we prepare the US foreign tax credit calculations that sit behind them.
For the business, we prepare Forms 8858, 5471, 926 and 8832 and the elections that support branch losses. We also prepare UK corporation tax returns and work alongside your payroll provider on PAYE and the certificate of coverage. Furthermore, we prepare FBAR and Form 8938 filings for the owner and the company, and we bring earlier years up to date where filings were missed.
Conclusion
The Expansion Worker visa is one of the few routes that lets an American owner build a UK business in person. It is also one of the few that forces a corporate tax decision before the first application form. Branch or subsidiary, certificate of coverage or National Insurance, credit or exclusion: each choice has a correct order and a deadline. Above all, the decisions are far cheaper to make before the sponsor licence than to repair afterwards.
Owners who treat the Expansion Worker visa as an immigration project alone usually pay for it in tax. In contrast, owners who settle the structure, the payroll and the personal filings first often find that the first-year savings exceed the whole cost of the move. Ultimately, the Expansion Worker visa lasts two years, but the tax structure you register for it can last for decades.
Contact Us
If you are planning a UK launch on an Expansion Worker visa, speak to our team before the sponsor licence application is filed. You can book a consultation with TaxYork, email hello@taxyork.com or call 020 3488 8606. We prepare US and UK returns for owners, executives and their companies, and we work to your immigration timetable.
Disclaimer
This article provides general information only and reflects US and UK tax rules and published immigration requirements as understood in October 2026. Visa rules, salary thresholds and tax rates change frequently. This article is not legal, immigration or tax advice for your circumstances. Always obtain professional guidance from a qualified specialist before you register a UK entity, apply for a sponsor licence, file an election or change your country of residence.