Introduction: The Senior or Specialist Worker Visa Is a Tax Timetable
The Senior or Specialist Worker visa lets a multinational move an established employee to its UK branch or subsidiary, and for an American executive it starts five separate clocks on the day the plane lands. The Senior or Specialist Worker visa has a maximum stay. UK tax reliefs for new arrivals have their own limits. Social security cover under the US-UK agreement runs for a fixed term. Meanwhile, the United States keeps taxing you throughout. However, the guides to this route come from immigration firms, and they stop at the sponsor licence.
That leaves the expensive questions unanswered. Which payroll pays you? Who bears National Insurance at 15%? Does your housing allowance escape UK tax, and for how long? Furthermore, what happens to your stock awards, your New York residency and your foreign tax credits when the assignment ends? Each answer depends on the length of the assignment that your employer writes on the certificate of sponsorship.
This guide to Senior or Specialist Worker visa tax therefore reads the immigration rules and the tax rules together. It sets out the route as it stands in 2026, the UK and US positions, and a worked case study for a managing director transferred from New York. At TaxYork, we prepare both countries' returns for assignees and their families, so the points below come from real assignment files.
Senior or Specialist Worker Visa Rules That Drive the Tax Position
How the Senior or Specialist Worker Visa Works in 2026
The Senior or Specialist Worker visa is part of the Global Business Mobility family and replaced the old Intra-company Transfer route. The GOV.UK overview of the route confirms that you must already work for a group that holds a UK sponsor licence. Your UK role must be on the eligible occupations list, and you need a certificate of sponsorship that describes it.
Salary is the main gate to a Senior or Specialist Worker visa. Under the eligibility rules, you must earn at least £52,500 a year or the going rate for the occupation, whichever is higher. Additionally, anyone paid less than £73,900 must have worked for the group outside the UK for at least 12 months. Above that figure, no minimum service applies. The route has no English language test.
How Long You Can Stay
The Senior or Specialist Worker visa is temporary by design. Each grant lasts up to five years or the length of the certificate plus 14 days, whichever is shorter. Moreover, a cumulative cap applies. If you earn less than £73,900, you can spend five years in any six in the UK on these routes. If you earn £73,900 or more, the limit is nine years in any ten.
Importantly, time on this route never counts towards settlement. An executive who wants indefinite leave to remain must switch, usually to the Skilled Worker visa, and start a fresh qualifying period. As a result, the Senior or Specialist Worker visa suits a defined assignment better than an open-ended move.
What the Route Costs and Who Pays
The GOV.UK fees page sets the application fee from outside the UK at £819 for up to three years and £1,618 for longer. The healthcare surcharge adds £1,035 per person for each year. In addition, the sponsor pays the Immigration Skills Charge, which for a medium or large sponsor is £1,320 for the first year and £660 for each further six months.
Employers usually meet all the costs of a Senior or Specialist Worker visa. For the initial move, employer-paid visa costs can fall within the £8,000 relocation exemption. However, fees for later extensions generally count as taxable benefits. Accordingly, a family of four on a five-year grant can generate a UK tax charge on visa costs alone.
Why the Certificate Length Matters for Tax
Your employer chooses the assignment dates on a Senior or Specialist Worker visa. That choice looks administrative. In practice, it decides whether your housing and travel costs are tax-free, whether you stay in US Social Security and how your home state views the move. Therefore the tax review should happen before the certificate is assigned, not after you arrive.
UK Tax Residence and Reliefs During the Assignment
Residence Under the Statutory Residence Test
A temporary Senior or Specialist Worker visa does not mean temporary tax status. Under the Statutory Residence Test, which HMRC explains in guidance note RDR3, you are UK resident if you spend 183 days here in a tax year or work full-time in the UK for 365 days. Almost every holder of a Senior or Specialist Worker visa therefore becomes resident in the arrival year. Split-year treatment then protects income from before the move, provided you claim it on a UK return.
The Four-Year Regime and Repeat Assignees
New residents can claim relief on foreign income and gains for their first four tax years, under HMRC's four-year regime guidance. The condition is ten consecutive years of non-residence beforehand. For a first-time assignee with a US investment portfolio, that relief removes UK tax on dividends, interest and gains for most of a typical posting.
However, the Senior or Specialist Worker visa attracts repeat assignees. The immigration rules expressly allow three years in London, six months abroad and a return for two more. In contrast, the tax rules do not reset. An executive who was UK resident on an earlier posting within the last ten years gets no four-year relief at all the second time. Consequently, the US portfolio becomes fully taxable in Britain from the first day back.
Overseas Workday Relief
People on a Senior or Specialist Worker visa travel. Overseas Workday Relief exempts earnings for days worked outside the UK, up to the lower of 30% of employment income or £300,000 a year, for those who qualify for the four-year regime. Our guide to Overseas Workday Relief for US executives covers the mechanics. For a transferred executive who still spends a week a month in New York, the relief can be the largest single UK saving.
Detached Duty Relief and the 24-Month Line
A temporary workplace carries its own relief. If your London posting is expected to last no more than 24 months, and you remain employed by the home company, your employer can pay accommodation, subsistence and travel free of UK tax. HMRC's manual on the 24-month rule sets out the test. Importantly, the test looks at expectation. Once the assignment is expected to exceed 24 months, relief stops from that date.
This is where the Senior or Specialist Worker visa and the tax rules meet. A certificate of sponsorship for three years is evidence that the posting was never expected to end within 24 months. In that case, a £60,000 housing allowance is taxable from day one. We explain the rules fully in our article on detached duty relief for US executives.
Payroll, National Insurance and Social Security
Which Payroll Runs
The UK sponsor must show the Home Office that it pays the salary stated on the certificate. However, many Americans on a Senior or Specialist Worker visa stay on the US payroll and contract. HMRC then looks to the UK host entity to operate Pay As You Earn on the earnings. HMRC's guidance for employees coming from abroad describes the starter process, and most groups run a shadow payroll to report the figures.
As a result, you can receive a US payslip with US withholding while UK tax is also paid on the same earnings. Without planning, cash flow suffers for months. Therefore your US withholding should be reduced through a revised Form W-4 that anticipates the foreign tax credit.
Tax Equalisation
Most large groups equalise tax for staff on a Senior or Specialist Worker visa. You pay a hypothetical tax equal to what you would have paid at home, and the employer pays the real UK and US bills. For those cases, HMRC allows a simplified scheme under its modified payroll rules for tax-equalised employees. The employer-paid tax is itself taxable income in both countries, so it is grossed up. Our guide to tax equalisation and hypothetical tax explains what that does to your US return.
Equalisation does not remove your filing duties. You still sign both returns, and you remain personally liable for them. Furthermore, most policies cover employment income only. Your investment income, your spouse's earnings and any gain on selling a home usually fall outside the policy.
The Certificate of Coverage
Social security is the largest hidden cost of a Senior or Specialist Worker visa posting. UK employer National Insurance is 15% with no ceiling, and the employee pays 8% and then 2%, as the GOV.UK National Insurance tables show. In contrast, the US Social Security tax of 6.2% stops at a wage base of $184,500 for 2026.
Under the US-UK Social Security agreement, an employee sent to Britain by a US employer for five years or less stays in the American system. A certificate of coverage from the Social Security Administration then exempts both you and your employer from National Insurance. The IRS explains the same principle for Americans working abroad.
The conditions matter. You must remain employed by the US entity, and the posting must be expected to last no more than five years. Consequently, a local UK contract, or a nine-year plan for a high earner on a Senior or Specialist Worker visa, puts the exemption at risk. The five-year social security limit and the nine-year immigration limit do not match.
Your 401(k) During the Assignment
Staying in the US plan is normally the right course. The US-UK tax treaty gives UK tax relief for contributions to a US employer plan where you joined the plan before you arrived. Therefore employer contributions to your 401(k) do not become a UK taxable benefit. In contrast, joining a UK scheme for a short posting creates a small foreign pension that must appear on US reports for decades.
US Returns During a Senior or Specialist Worker Visa Assignment
Worldwide Filing Continues
You file Form 1040 every year on worldwide income, and a Senior or Specialist Worker visa changes nothing about that. Moving to London gives you an automatic extension to 15 June and nothing more. For that reason, US tax returns for expats on assignment combine US wages, employer-paid foreign tax, housing benefits and two tax years that do not align.
The Tax Home Problem
The foreign earned income exclusion under section 911 of the Internal Revenue Code is worth $132,900 for 2026. However, it requires a tax home in a foreign country. Under the IRS tax home rules, an assignment realistically expected to last one year or less leaves your tax home in the United States. Additionally, keeping your abode in America can defeat the exclusion even on a longer posting.
Notice the mismatch. Britain treats a workplace as temporary for up to 24 months, while the IRS draws its line at one year, as its guidance on business travel confirms. A 20-month posting is therefore temporary for HMRC but indefinite for the IRS. Housing can be tax-free in the UK and fully taxable in the US for the same months.
Foreign Tax Credits and Their Timing
Most assignees rely on the foreign tax credit. UK tax on a senior package exceeds the US tax on the same income, so the credit normally clears the federal bill. Nevertheless, timing causes trouble. UK tax for a year ending 5 April is paid across two US calendar years, and equalised employees often see the final UK payment made after they have gone home.
In addition, income for US workdays is US-source. It earns no foreign tax credit, even though Overseas Workday Relief may also have removed the UK tax. Our tax treaty and foreign tax credit service reconciles workdays, sourcing and credits each year.
Your Home State
State tax is the item most Senior or Specialist Worker visa holders forget. New York and California treat a temporary absence as no change of domicile, and a fixed-term visa that cannot lead to settlement is strong evidence of a temporary absence. Therefore many assignees remain state residents, taxable on worldwide income, unless they meet a statutory safe harbour. California's requires at least 546 consecutive days abroad under an employment contract. New York's requires 450 days abroad in a 548-day period with limited time back in the state.
FBAR and Form 8938
Opening a UK bank account for your net pay creates a reporting duty. Once your non-US accounts exceed $10,000 in total at any time in the year, you file the FBAR with FinCEN. Furthermore, signature authority over the UK entity's accounts can require a report even though the money is not yours. Our FBAR and FATCA reporting service covers personal and corporate accounts together.
Leaving, Extending or Switching Route
Going Home
Departure needs as much care as arrival. Split-year treatment can apply when you leave to work full-time overseas, and you notify HMRC through form P85 or a final return. However, UK tax does not stop on your last day. A bonus paid after you leave, or stock that vests later, remains taxable in Britain for the part earned on UK workdays. Consequently, many returned assignees owe UK returns for two or three years after the posting.
Extending the Assignment
An extension of a Senior or Specialist Worker visa changes more than your immigration status. It can end detached duty relief early, because the expected length now exceeds 24 months. Similarly, it can take the posting beyond the five-year social security certificate. In addition, the fourth anniversary ends the four-year regime, so a US portfolio that was invisible to HMRC becomes fully taxable. Each of those dates should sit in one timetable.
Switching to the Skilled Worker Route
Switching from a Senior or Specialist Worker visa is the path to settlement, and it is common. For tax, residence continues unchanged. Nevertheless, the switch signals an intention to stay. That intention weakens any claim that the workplace is temporary and supports a change of state domicile at the same time. Therefore the switch is a natural point to review the whole position. Our guide to Expansion Worker visa tax covers the sister route for groups with no UK presence yet.
Catching Up on Missed Filings
Some assignees assume the employer's tax provider handled everything, then discover that FBARs or a state return were never filed. Fortunately, the IRS Streamlined Filing Compliance Procedures offer a route back for non-wilful cases. Our IRS Streamlined Filing service deals with those, although prompt action matters.
Case Study: A New York Managing Director Posted to London
Sarah is a managing director at a US bank in New York. Her employer transfers her to its London subsidiary from 1 July 2026 on a Senior or Specialist Worker visa. She stays on her US contract, with a salary of $400,000, about £300,750, and a London housing allowance of £60,000. Her package is tax-equalised. She has never lived in Britain. All figures are illustrative, at $1.33 to the pound.
The first decision is length. Her employer first proposes a three-year certificate. On that basis, detached duty relief never applies, and the housing allowance is taxable at 45%. The tax is £27,000 a year. Because the employer pays it under the equalisation policy, it must be grossed up, which lifts the cost to about £49,100 a year.
The employer then considers a 24-month posting instead. Housing now qualifies for relief, and the gross-up cost disappears. Over two years, that saves the bank about £98,000. However, the IRS still treats her tax home as London, because the posting exceeds one year. The housing therefore remains US income, subject to the housing exclusion or credits.
Next comes social security. With a certificate of coverage, Sarah and the bank stay in the US system. Without it, the bank would pay employer National Insurance of 15% on earnings above £5,000, which is about £53,400 a year on £360,750. Sarah would pay about £9,200 herself. The certificate therefore saves more than £60,000 a year in UK contributions, against continuing US contributions of roughly $18,400 for the employer.
Sarah also travels. She works 40 of her 230 days each year in New York. Overseas Workday Relief exempts 17.4% of her earnings, about £62,700, saving £28,200 of UK tax at 45%. Nevertheless, those days are US-source, so the United States taxes them with no foreign credit. The net saving is the gap between the two rates, and it belongs to the employer under her policy.
Her own money is separate. Sarah holds a US portfolio paying $50,000 of dividends, which equalisation does not cover. She claims the four-year regime, so Britain charges nothing on them. Without the claim, UK tax at 39.35% would be about £14,800 a year, less a credit for US tax at 15%. Finally, she spends fewer than 90 days a year in New York and meets the 548-day test, so her state residency ends for the posting.
How TaxYork Can Help
TaxYork prepares UK and US returns for assignees, and we work alongside employer programmes where one exists. For a Senior or Specialist Worker visa holder, we review residence, split-year claims, the four-year regime and workday records. Furthermore, we prepare the US return with the correct credit and sourcing positions, state part-year returns, FBARs and Form 8938.
We act mainly for investment bankers, senior executives, investors and company owners. In our experience, employer-provided tax support covers the employment package and little else. Therefore we concentrate on what it leaves out: personal investments, family members, property and the years after departure.
Conclusion
A Senior or Specialist Worker visa is a temporary immigration status with lasting tax effects. The length on the certificate decides whether housing is tax-free under the 24-month rule. The US employment contract decides whether a certificate of coverage removes National Insurance at 15%. Meanwhile, the four-year regime protects a US portfolio, but only for first-time arrivals. The United States taxes you throughout, and its one-year tax home rule does not match the British test. Above all, the clocks run to different lengths: two years, four years, five years and nine. In summary, set the timetable before the certificate is assigned.
Contact Us
If you are moving to London on a Senior or Specialist Worker visa, speak to our team before your start date. You can book a consultation online, email hello@taxyork.com or call 020 3488 8606. Alternatively, contact us with your assignment letter, and we will map the returns and deadlines in both countries.
Disclaimer
This article provides general information only and reflects the rules in force in October 2026. It is not a substitute for professional guidance on your own circumstances, and immigration rules, tax rates and exchange rates change. Professional standards published by bodies such as the Chartered Institute of Taxation and the ICAEW Tax Faculty inform our work. For help with your own position, please contact TaxYork on 020 3488 8606 or at hello@taxyork.com before acting.