Introduction: Managed Service Company Rules and the Bill That Arrives Years Late
The managed service company rules are the quietest expensive thing in British contracting. Furthermore, they arrive without warning, often six or seven years after the tax year in question. HMRC is currently pursuing determinations for 2017/18 that will not reach a tribunal until late 2026.
For a British contractor that delay is merely painful. For an American, it is considerably worse. Meanwhile, the US refund windows that would normally rescue the position have already closed on most of the years involved.
At TaxYork we prepare returns for Americans contracting through UK companies, and this campaign has reached several of them. In our experience, the UK adviser handles the appeal competently while nobody examines the American consequences at all. Consequently, clients recover the UK position and lose thousands on the US side.
This guide explains what a managed service company is, how HMRC proves it, and precisely what the determination does to your US return. Additionally, it sets out which recovery windows remain open and in what order to use them.
What a Managed Service Company Actually Is
A managed service company is a company that supplies one individual's services to clients while an external provider remains involved in running it. The legislation sits in Chapter 9, Part 2 of ITEPA 2003 and has applied since 6 April 2007.
The target was never the contractor. Rather, Parliament aimed squarely at scheme providers who bulk-supplied ready-made companies, chose the salary and dividend split, and left the worker with none of the responsibility of directorship.
The consequence is severe and mechanical. Where the rules bite, all company receipts become employment income subject to PAYE and National Insurance. Therefore, the dividend planning that motivated the structure is retrospectively undone.
Why Americans Are Hit Hardest
An American contractor faces a second system that never agreed to any of this. The IRS taxed your income as you originally reported it, typically as dividends. Now HMRC says it was always employment income instead.
That mismatch is not cosmetic. Specifically, dividends and wages sit in different foreign tax credit baskets, attract different treatment under the exclusions, and follow different refund deadlines. Consequently, a UK determination can strand credits you already claimed.
Nobody writes about this. Indeed, every substantial guide to the managed service company legislation is written for a purely British reader, so the American half of the problem goes unexamined.
The Four Conditions That Define a Managed Service Company
To establish a managed service company, HMRC must satisfy four conditions, all of which appear in section 61B ITEPA 2003. The first three are usually straightforward. The fourth decides almost every case.
The First Three Conditions
Firstly, the company's business must consist wholly or mainly of providing an individual's services to third-party clients. A single-contractor company satisfies it immediately.
Secondly, the worker must receive the greater part of what the company receives from the client. Again, a one-person company almost always qualifies.
Thirdly, the legislation compares outcomes. It asks whether the worker received more than they would have done had every payment been treated as employment income. HMRC sets out all four in manual ESM3510. Consequently, any salary-plus-dividend structure passes this test by design.
The Fourth Condition: An MSC Provider Involved With Your Company
Everything turns on involvement. Specifically, a managed service company provider is involved where it benefits financially on an ongoing basis from the supply of the individual's services, or influences or controls how those services are provided.
Involvement also arises where the provider influences or controls how payments reach the individual, or influences or controls the company's finances or activities. Finally, it arises where the provider gives or promotes an undertaking to make good any tax loss. HMRC expands on this in manual ESM3515.
Note how low the bar sits. A provider that runs your payroll, decides the dividend split each month and charges a percentage of turnover meets several limbs simultaneously. Therefore, the ordinary contractor accountancy package is precisely what HMRC examines.
The Accountancy Exclusion and Why It Is Narrower Than It Looks
Section 61B(3) protects genuine professionals. Notably, a person does not become a managed service company provider merely by supplying legal or accountancy services in a professional capacity. Many contractors read that sentence and stop worrying.
The word doing the work is "merely". Where the firm also selects your remuneration mix, operates your bank account or supplies a standardised portal that makes the decisions for you, the exclusion falls away. Accordingly, membership of a professional body guarantees nothing on its own.
The Court of Appeal confirmed the point in Christianuyi, which remains the leading authority. Consequently, HMRC now treats the exclusion as narrow, and it has pursued mainstream accountancy firms on that basis.
What Happens When HMRC Says You Are One
A managed service company determination lands on the company first and on you personally second. Both stages matter for an American filer, though for different reasons.
Deemed Employment Income and PAYE
Once the managed service company rules apply, the company must treat all payments to the worker as employment income. PAYE and Class 1 National Insurance follow, including employer contributions at 15 per cent above the £5,000 secondary threshold for 2026/27, as set out in the HMRC employer rates guidance.
There is no five per cent allowance and no deduction for the provider's fees. Furthermore, HMRC computes the liability on gross receipts, then adds interest running from the original due dates.
Corporation tax already paid does not simply vanish either. Rather, the interaction must be unwound separately, which is one reason these determinations take years to settle.
The Section 688A Transfer of Debt
Here is the provision that alarms people, and rightly so. Where the company cannot pay, section 688A ITEPA 2003 lets HMRC transfer the PAYE and National Insurance debt to individuals.
The order is prescribed. Specifically, HMRC looks first to the company's directors and their associates, then to the provider and its associates, and onward down the statutory chain. Consequently, a contractor who was the sole director of a dissolved company can receive a personal demand for the company's tax.
That personal exposure creates a genuinely difficult US question, which we address below. Additionally, it explains why appeals in this area are fought so hard.
Where the Enforcement Campaign Stands in 2026
HMRC has issued managed service company determinations to thousands of contractors covering 2017/18, 2018/19 and 2019/20. Two providers dominate the caseload, and roughly 339 contractors are represented collectively in the lead appeals.
The timetable matters enormously. A transfer of debt appeal was heard in June 2026, while the substantive question of whether the companies are managed service company structures reaches tribunal in November 2026. Appeals beyond that are widely expected.
Consequently, many contractors will not know the answer until 2027 or later. Meanwhile, American refund windows continue running, which is exactly the trap this guide exists to flag. Professional bodies including ICAEW and the Chartered Institute of Taxation continue to press HMRC on the conduct of the campaign.
The US Consequences Nobody Explains
Now to the half of the problem that no British guide addresses. A managed service company determination reaches into your American filings in three distinct ways.
Your US Return Reported the Wrong Character of Income
Most contractors caught by the managed service company rules reported a small salary and substantial dividends. On the US return, that salary was wages and those dividends were passive income. You then claimed foreign tax credit for the UK tax actually paid.
A managed service company determination rewrites all of it. Suddenly the same receipts are employment income, which is general category income for foreign tax credit purposes rather than passive. Consequently, credits sitting in your passive basket relate to income that no longer exists there.
Baskets do not talk to each other. Therefore, an unused passive carryforward cannot simply migrate across to shelter the recharacterised wages, and the IRS foreign tax credit guidance confirms the separate limitation applies basket by basket.
Section 905(c) and the Mandatory Redetermination
When a managed service company determination changes your UK tax after a credit was claimed, that is a foreign tax redetermination. Section 905(c) then obliges you to notify the IRS, and the duty applies whether or not your US liability actually moves.
The mechanics are specific. You complete Schedule C of Form 1116 for the year the redetermination occurs, then file Form 1040-X for any year where the liability changes. Penalties for omission run independently of the tax at stake.
Very few American contractors know this duty exists. Accordingly, we treat it as the first item on any managed service company engagement rather than the last.
The Twenty-Four Month Rule That Strips the Credit
This trap is brutal in exactly the managed service company circumstances. Where you claim credit for accrued foreign taxes and those taxes remain unpaid twenty-four months after the close of the year, the regulations treat them as refunded. The credit is stripped retroactively.
Apply that to a determination for 2017/18 still under appeal in 2026. An accrual-basis claim made when the determination landed would long since have failed the test. Consequently, the credit becomes available only when the tax is genuinely paid.
Plan the timing deliberately, therefore. Paying under protest to preserve a credit is sometimes the right answer, and sometimes an expensive mistake, but it should always be a decision rather than an accident.
Reclaiming the US Tax: Windows and Sequencing
Several American windows survive a managed service company determination, though they close at different speeds. Sequencing them correctly is where the money is.
The Ten-Year Foreign Tax Credit Window
The general refund limit is three years from filing or two from payment. However, an amended return claiming the foreign tax credit generally receives ten years, running from the unextended due date for the year the foreign tax was paid or accrued. The IRS confirms this in Topic 856 and Publication 514.
That distinction rescues these cases. Years you assume are closed for every other purpose remain open for a credit claim, which is precisely what a late managed service company determination requires.
Do not assume it stretches indefinitely, though. Ultimately, ten years from 2018 expires in 2029, and appeals running to 2027 leave less headroom than contractors expect.
Self-Employment Tax and the Three-Year Limit
Different claims follow different clocks, and this is the one people miss. Self-employment tax refunds run on the ordinary three-year limit rather than the ten-year foreign tax credit window.
Most managed service company contractors operated through a limited company, so they paid no self-employment tax. Where an earlier year was filed on Schedule C by mistake, however, address it first. Otherwise the shortest deadline expires while you concentrate on the larger claim.
Our US tax return preparation service triages the open years in deadline order before anything is filed. Consequently, nothing expires while a bigger number is being argued.
National Insurance Earns No Credit At All
Expect disappointment on the National Insurance in a managed service company demand, because it is unavoidable. National Insurance contributions are social security payments rather than creditable income taxes, so they generate no foreign tax credit whatsoever. The US-UK totalisation agreement handles them instead, as the SSA agreement summary explains.
The proportion is substantial in these determinations. Employee and employer Class 1 together frequently account for a quarter or more of the total demand. Therefore, that portion of your UK bill delivers precisely nothing on the American side.
Model the split before you budget for the outcome. Additionally, our tax treaty optimisation service tests whether any treaty article improves the residual position.
Is a Transferred Debt Even Creditable?
A section 688A direction in a managed service company case raises a question with real money attached. Therefore, it deserves its own analysis.
The Legal Liability Test Under Section 901
American law credits foreign taxes that are the taxpayer's own legal liability. A transfer of debt direction makes you personally liable for a debt that originally belonged to the company. Whether that satisfies the test is genuinely arguable.
Notably, the position is strongest where the direction is final and you actually pay. It is weakest where you pay voluntarily to protect a company you no longer own, because voluntary payments of another person's tax are not creditable.
We have seen the parallel problem in umbrella arrangements, where a regulation 72 direction destroys the UK credit and the American credit together. Consequently, we treat these directions as a tax question rather than merely a collection matter.
How We Document the Position
Documentation decides managed service company cases. We keep the determination, the direction, the appeal correspondence and proof of payment, then map each amount to the year it relates to and the basket it belongs in.
That record supports the Form 1116 claim and the section 905(c) notification simultaneously. Furthermore, it converts a contested position into a defensible one if the IRS ever asks.
Staying Outside the Managed Service Company Rules in Future
Prevention is straightforward once you understand what HMRC actually examines. Furthermore, the fixes are practical rather than structural, and most take an afternoon.
Make the Decisions Yourself
The fourth condition turns on someone else's involvement, so removing that involvement removes the exposure. Decide your own salary and dividend split each year, and record the decision in a board minute you actually wrote.
Similarly, keep control of the company bank account in your own hands. Where a provider holds the mandate or moves money on your behalf, you have handed HMRC the clearest possible evidence of involvement.
Instruct your accountant rather than subscribing to a package. Consequently, the relationship looks professional rather than managerial, which is exactly what section 61B(3) protects.
Watch the Fee Structure
Percentage-of-turnover fees are a warning sign, because they demonstrate ongoing financial benefit from the supply of your services. A fixed professional fee carries no such implication.
Standardised portals deserve the same scrutiny. Where the software determines your remuneration rather than recording it, the managed service company analysis becomes considerably harder to resist.
Additionally, treat any promise to indemnify your tax position as a red flag. Undertakings to make good a tax loss are an express limb of the involvement test.
Keep Evidence Contemporaneously
HMRC examines these arrangements years later, when memories have faded and providers have gone. Therefore, the contemporaneous record is what decides the appeal.
Keep your engagement letter, your own remuneration decisions and your correspondence with the accountant. Above all, keep evidence that you instructed them rather than the reverse, because that single distinction separates a professional adviser from a managed service company provider.
Case Study: An American IT Contractor Caught by the Campaign
Consider a client we will call Jordan, an American technology contractor in London. Jordan used a contractor accountancy provider between 2017 and 2020, and the company received roughly £145,000 each year. Notably, the provider set the remuneration mix, paying a salary of about £8,600 and dividends of about £96,000 annually.
HMRC issued determinations across all three years. Recomputed as employment income, the additional PAYE and National Insurance came to approximately £62,000 before interest. Jordan had never chosen the salary and dividend split personally, which is exactly why the fourth condition was satisfied.
The American analysis then diverged sharply from the British one. Jordan had reported the dividends as passive income and claimed foreign tax credit for the UK dividend tax within the passive basket. Recharacterisation moved that income into the general category, leaving the earlier passive credits attached to income that no longer existed.
Accordingly, we quantified the unrecoverable element first. Of the £62,000 demanded, roughly £18,000 represented Class 1 National Insurance, which earns no American credit at all. That is about $23,700 of pure cost, before considering interest, which is likewise not creditable.
The creditable balance of about £44,000, roughly $58,000, then had to reach the correct year and basket. Because the determination remained unpaid pending appeal, we did not claim on an accrual basis, since the twenty-four month rule would have stripped it retroactively.
Instead we prepared the section 905(c) notification, filed protective amendments within the ten-year window for 2018 and 2019, and documented the transfer of debt exposure. Consequently, Jordan preserved roughly $58,000 of credit that would otherwise have expired unclaimed while the UK appeal continued.
Missed Filings and Catching Up
Some contractors discover the American problem only when the managed service company letter arrives. Fortunately, structured routes exist for that too.
Streamlined Foreign Offshore Procedures
Where US filings were missed entirely and the failure was non-wilful, the IRS Streamlined Filing Compliance Procedures remove the offshore penalty for qualifying non-residents. You file three years of returns, six years of FBARs and a certification explaining the failure.
A managed service company determination supports a genuinely non-wilful narrative. After all, the contractor did not choose the structure, the provider did, and HMRC itself took years to reach a view. Our IRS Streamlined Filing service builds that certification from the provider's own records.
Form 5471 and the Company Itself
Do not overlook the company itself. Additionally, a US person controlling a UK company files Form 5471, and the penalty starts at $10,000 per form per year regardless of any tax owed.
Contractors routinely stop filing once the company is dissolved. However, the obligation attaches to the years the company existed, so dissolution fixes nothing retrospectively. Accordingly, we map every open year alongside our FBAR and FATCA reporting service before filing anything.
How TaxYork Can Help
We prepare US and UK returns for contractors and company owners across both systems. Therefore, we can read an HMRC determination and a Form 1116 limitation with equal fluency, which on this topic decides the outcome.
Our work on a managed service company case starts with the calendar. We identify which American windows are closing first, quantify the non-creditable National Insurance element, and settle the basket question before any amendment goes out. Additionally, we prepare the section 905(c) notification that most filers never make.
Importantly, we coordinate with your UK appeal rather than duplicating it. Consequently, the American claims stay alive while the British argument runs its course, and you are not forced to choose between them.
Conclusion
The managed service company rules punish a decision most contractors never consciously made. Furthermore, the delay between the tax year and the determination is precisely what damages Americans, because US refund windows do not pause for a UK tribunal.
Three points deserve action now. National Insurance in the demand earns no American credit, so budget for it. Recharacterisation moves income between foreign tax credit baskets, which can strand credits already claimed. Additionally, the twenty-four month rule means an unpaid determination cannot safely be accrued.
Act before the windows close rather than after the appeal concludes. Ultimately, a protective amendment costs little, whereas a lapsed ten-year window cannot be reopened at any price.
Contact Us
Speak to a specialist who prepares both returns rather than one. If you have received an HMRC managed service company determination, or a section 688A transfer of debt notice, book a consultation with our team today.
Email hello@taxyork.com or call 020 3488 8606. Furthermore, bring the determination and your last six US returns to the first meeting, because sequencing the claims correctly depends on knowing which years are already closed.
Disclaimer
This article provides general information on UK and US tax rules current at August 2026. It does not constitute tax advice for any specific person, company or determination. Outcomes depend entirely on individual facts, the provider arrangement and the progress of any appeal. Accordingly, you should obtain professional advice before acting. TaxYork accepts no liability for action taken solely in reliance on this content.