Updated July 2026. Written by Tax Dispute Consultants, specialist ex-HMRC tax investigation team. Read time: 10 minutes.

Most contractors who fall foul of the Managed Service Company legislation did not set out to use a tax avoidance scheme. They signed up with an accountancy provider offering a simple, standardised limited company package, never gave it a second thought, and years later found HMRC treating their company as an MSC and coming after them personally for unpaid PAYE and National Insurance. HMRC has been actively enforcing this legislation again since late 2024, and it remains one of the least understood traps in the contracting world.

What actually makes a company an MSC

The Managed Service Company legislation, at section 61B of the Income Tax (Earnings and Pensions) Act 2003, treats certain company arrangements as if the individual providing services through them were an employee for tax purposes, taxing all payments received, including dividends, as employment income subject to PAYE and NIC. Four conditions need to be met together: the business of the company consists wholly or mainly of providing the individual's services to third parties; payments are made to the individual (or an associate) broadly equal to what the company receives for those services, less a small margin; the way those payments are structured would, absent the legislation, produce a more favourable tax result than straightforward employment income (typically through a wages and dividends split); and, critically, an “MSC provider” is involved with the company.

That last condition is where most disputes are actually fought. An MSC provider is broadly a person carrying on a business of promoting or facilitating the use of companies to provide individuals' services, and involvement is defined broadly: benefiting financially on an ongoing basis from the company's provision of the individual's services, influencing or controlling how payments to the individual are made, influencing or controlling the company's finances or affairs, or providing (or facilitating the provision of) a director or company secretary. The legislation was never aimed at ordinary accountants who prepare a client's annual accounts and file a tax return, it was aimed at businesses running standardised, packaged company products at scale, where the individual contractor has effectively handed over control of how their own pay is structured.

The Christianuyi case: how wide “involvement” really is

The leading authority on what counts as an MSC provider is Christianuyi Ltd and others v HMRC, which worked its way from the First-tier Tribunal in 2016 through the Upper Tribunal in 2018 to the Court of Appeal in March 2019, with the Supreme Court refusing permission to appeal further that December. The case concerned Costelloe Business Services, an accountancy business running a standardised product for contractor clients. HMRC argued, and every tribunal and court agreed, that Costelloe was an MSC provider because it “influenced or controlled” how payments were made to the individuals: the product determined the split between wages and dividends and carried out the administrative steps needed to pay dividends rather than simply wages, and Costelloe's clients received the benefit of that structuring as a standard feature of signing up, not as bespoke advice sought and given.

The significance of the case is how wide it confirmed “influence or control” to be. It does not require the accountant to be involved in each individual company's day-to-day running, or to make specific decisions about a particular client's affairs. Running a standardised product that determines, by design, how contractors are paid is enough. That is precisely why the MSC legislation catches people who genuinely believed they simply had an accountant, because from a legal perspective, an accountancy provider offering a packaged wage-and-dividend product for a fixed monthly fee is doing exactly what Costelloe was found to be doing.

The practical distinction that matters: an accountant who advises you, on your own facts, that paying yourself a modest salary and the balance as dividends is tax-efficient, leaving you to actually run the company and make the decision, is not an MSC provider. A provider running a standard product where the payment split, and the administrative mechanics of achieving it, are baked into the service you signed up for is a very different, and much riskier, arrangement.

How HMRC transfers the debt when an MSC can't pay

Where an MSC is found to owe PAYE and NIC it cannot pay, the legislation allows HMRC to transfer the debt to three categories of person, in a defined order. The director, other office holder or associate of the MSC is the first port of call. If recovery from that group is insufficient, HMRC can look to the MSC provider itself, or the directors and associates of the MSC provider. Beyond that, HMRC can pursue any other person who directly or indirectly encouraged or was actively involved in the provision of the individual's services through the MSC, a deliberately broad category capable of catching introducers, umbrella arrangements and other parties in the supply chain, not just the accountant and the contractor.

HMRC published Spotlight 67 in November 2024, updated in January 2025, specifically to raise awareness of MSC schemes still operating and how to identify them, following an earlier Spotlight 32 warning about the same territory. The renewed attention followed a real, and widely reported, enforcement episode in which thousands of clients of specialist limited company accountancy providers received Regulation 80 determination letters after their accountants were found to meet the MSC provider definition, converting what those individuals thought was a routine accountancy relationship into a personal PAYE and NIC liability running into thousands of pounds each.

How these cases typically unfold

Case A: The standard package, years later

A contractor signs up with a fixed-fee limited company accountancy provider in 2019, using its standard service, which automatically calculates a modest salary and quarterly dividends based on available profit, with the provider preparing and filing all the paperwork. The contractor never queries the mechanics, assuming this is simply what a good accountant does. In 2025, HMRC notifies the accountancy provider's entire client base that it has been found to be an MSC provider following an enquiry, and issues Regulation 80 determinations reclassifying several years of dividends as employment income. Because the contractor genuinely had no visibility into the provider's wider business model or the basis for HMRC's finding, and cooperated fully once notified, the resulting negotiation focuses on penalty behaviour and payment terms rather than disputing the underlying MSC finding itself, which by that point has already been established against the provider more broadly.

Case B: The bespoke advice that survived scrutiny

A different contractor uses an independent accountant who reviews their specific circumstances annually, recommends a salary level based on that year's National Insurance thresholds and the contractor's own decision about dividend timing, and does not operate any standardised product across a client base. When HMRC opens a wider enquiry into contractor accountancy arrangements in the same region, this contractor's accountant is not found to meet the MSC provider definition, because there is no evidence of a packaged product, no automated payment-splitting mechanism and clear evidence that decisions were the contractor's own, taken on individualised advice rather than baked into a standard service.

Responding to an MSC finding or debt transfer notice

Where HMRC asserts that a company is an MSC, the first question is always whether the MSC provider condition is genuinely met on the facts, since this is where Christianuyi leaves real room for argument depending on exactly how the accountancy relationship actually worked, standardised product versus individualised advice. Where the MSC finding is well founded, or has already been established against the provider, the focus shifts to the debt transfer notice itself: which category HMRC is relying on, whether the amount has been correctly calculated, and whether there is a genuine argument that the individual neither encouraged nor was actively involved in the arrangement beyond simply being a client of it. Time limits and appeal rights apply to these determinations in the same way as other PAYE assessments, and specialist advice before responding is particularly valuable given how technical the MSC provider question can be.

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Frequently asked questions

What is a Managed Service Company for tax purposes?

Broadly, a company where payments are structured to avoid PAYE and NIC and an “MSC provider” is involved in one of several defined ways, including influencing or controlling how the individual is paid, under ITEPA 2003, section 61B.

Can HMRC recover unpaid PAYE from someone other than the company?

Yes. The debt can transfer to the director or office holder of the MSC, to the MSC provider or its associates, or to any other person who encouraged or was actively involved in providing the individual's services through it.

Does having a normal accountant put me at risk of the MSC rules?

Not if they give bespoke advice and let you run your company. The risk is standardised, packaged products where the provider determines or automates how you're paid.

What did the Christianuyi case decide?

The Court of Appeal confirmed that running a standard product determining a contractor's wage/dividend split, and administering it, amounted to “influencing or controlling” pay, making the provider an MSC provider even without day-to-day involvement in each client company.