Yesterday — 1 July 2026 — the UK Supreme Court handed down its unanimous judgment in Commissioners for His Majesty’s Revenue and Customs v BlueCrest Capital Management (UK) LLP [2026] UKSC 18. BlueCrest’s appeal was dismissed. The salaried members rules bite. And if your business operates through a Limited Liability Partnership, or you advise one, you need to understand exactly what this means — because HMRC’s appetite for investigation has just been validated at the highest level.
This is not a hedge fund story. It is a structural tax story. The same rules that caught BlueCrest apply to law firms, accountancy practices, consultancies, and any professional services LLP where the distinction between partner and employee is anything less than watertight.
What the Salaried Members Rules Actually Say
The salaried members rules were introduced by the Finance Act 2014 and are now found in sections 863A to 863G of the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005). They were Parliament’s answer to a straightforward problem: some LLP members were effectively employees receiving a fixed salary, contributing minimal capital, and exercising no real influence over the firm — yet paying tax at self-employed rates and avoiding employer’s National Insurance Contributions entirely. That arbitrage was the target.
A member is treated as an employee for tax purposes — subject to PAYE and employer’s NICs — if all three conditions are met simultaneously:
- Condition A: At least 80% of the member’s expected remuneration is a “disguised salary” — fixed, or varying without reference to the overall profits or losses of the LLP.
- Condition B: The member does not have “significant influence” over the affairs of the LLP.
- Condition C: The member’s capital contribution to the LLP is less than 25% of their disguised salary.
A member who fails any one condition avoids reclassification. BlueCrest conceded Condition C for all relevant members. The entire dispute therefore turned on Conditions A and B — and specifically what “significant influence” means under Condition B.
The BlueCrest Case: From FTT to the Supreme Court
HMRC audited BlueCrest Capital Management — one of the world’s largest macro hedge funds, run by Michael Platt — for the tax years 2014/15 through 2018/19. The dispute involved approximately £142 million of income tax and £55.3 million of employer’s National Insurance Contributions.
The First-tier Tribunal and Upper Tribunal had initially found that portfolio managers running large capital allocations — and desk heads — had significant influence and therefore fell outside the rules. The Court of Appeal disagreed in January 2025, overturning those findings and remitting the case. Yesterday, the Supreme Court unanimously confirmed the Court of Appeal’s approach and dismissed BlueCrest’s appeal. The case is now remitted back to the First-tier Tribunal for the detailed factual reckoning — but the legal framework is locked.
The Supreme Court case page confirms the neutral citation as [2026] UKSC 18. The Alternative Investment Management Association (AIMA) and the Managed Funds Association both intervened — a sign of how alarmed the asset management industry had become.
The Critical Legal Point: What “Significant Influence” Actually Means
This is where the judgment does lasting damage to the argument that had worked at lower tribunal level.
BlueCrest’s portfolio managers had real, day-to-day influence — they ran trading books, made investment decisions, and were highly paid professionals exercising genuine skill and judgment. The First-tier Tribunal had treated this de facto influence as sufficient for Condition B purposes. The Supreme Court said that was the wrong approach.
Significant influence, the Court confirmed, must derive from the statutory and contractual framework of the LLP — in practice, the LLP agreement itself. It is not enough that a member has influence in fact. The question is whether the mutual rights and duties of the members, as defined in the agreement, grant that member enforceable rights over the affairs of the LLP generally. Influence over a portfolio, a practice group, or a client team is not the same as influence over the affairs of the LLP as a whole.
This distinction matters enormously. Many LLP agreements are loosely drafted, grant wide discretion to a managing partner or executive committee, and say very little about the decision-making rights of individual members. That silence now costs money. Under the Supreme Court’s framework, a member whose influence is informal, factual, or confined to their own work area almost certainly does not meet the Condition B escape route — however senior or commercially important they may be.
Who Is in the Crosshairs
BlueCrest is a hedge fund, but the rules are structural, not sectoral. Consider the range of UK businesses that operate through LLPs and have members whose remuneration is largely fixed:
- Law firms — salaried partners, newly promoted partners, fixed-draw equity partners in two-tier structures
- Accountancy and advisory firms — including firms advising clients on these very rules
- Fund managers and private equity houses — management company LLPs, carry vehicles where some members have fixed management fees
- Consultancies — LLP structures used for professional indemnity or tax reasons with a mix of revenue-sharing models
- Architecture, engineering, and surveyors — regulated professions that favour LLP structures
The KPMG analysis on salaried members in professional partnerships sets out clearly why two-tier equity models deserve particular attention. A senior associate or junior partner who draws a fixed monthly amount and has no meaningful vote on firm strategy is structurally identical to the BlueCrest members HMRC targeted.
The HMRC Guidance Problem
BlueCrest made a pointed public statement after the ruling: HMRC’s published guidance on the salaried members rules “was, and remains, wrong,” and that businesses need to be able to rely on agency guidance for tax certainty. HMRC’s published manual — see HMRC Partnership Manual PM251010 — takes a somewhat broader view of significant influence than the Supreme Court has now confirmed.
HMRC said it would consider updating its guidance in light of the judgment. That review is now open. But — and this matters — LLPs that structured themselves in reliance on the existing HMRC guidance are not automatically protected. HMRC is not bound by its own manuals in the same way it would be by a statutory clearance. The Tax Adviser Magazine analysis covers the compliance landscape in detail.
The Backdated Liability Risk
HMRC can generally look back four years under a normal assessment, or six years where there has been a loss of tax through careless behaviour. For LLPs that have not conducted a rigorous salaried member analysis, the exposure is not just prospective — it is retrospective. BlueCrest’s bill covers five tax years. Employer’s NICs alone were £55.3 million. Add interest and late payment penalties.
For an LLP with twenty salaried partners each drawing £200,000, the employer’s NIC exposure at 13.8% above the secondary threshold is material — running to hundreds of thousands of pounds annually before any income tax reclassification. Multiply that by six years and it becomes an existential number for smaller partnerships.
The Saffery analysis on salaried member rules walks through the computational mechanics of what reclassification costs in practice — worth reading alongside the judgment itself.
What the Supreme Court Did Not Say
It is worth being precise about what this ruling does and does not establish. The Supreme Court did not say that all LLP members with fixed-draw remuneration are salaried members. What it said is that Condition B must be assessed by reference to the LLP agreement, and that informal or factual influence does not satisfy it. An LLP that genuinely grants members enforceable rights over the business — voting rights on major decisions, rights to block key appointments, participation in strategy — can still make a credible Condition B argument. The legal test has been clarified, not tightened to the point of impossibility.
The distinction matters for planning. If your LLP agreement is simply silent or vague, you have a problem. If it contains genuine, enforceable governance rights for members, you may still have a defence — but you need to verify that now, before HMRC comes to you rather than after.
Six Actions Every CFO or Managing Partner Should Take Now
- Commission a formal salaried member review. If you have not done this since the Finance Act 2014, or have not revisited it since the Court of Appeal judgment in January 2025, the Supreme Court ruling makes this mandatory. Map every member against Conditions A, B, and C with documented evidence.
- Read your LLP agreement — properly. Not the partnership deed summary. The actual executed agreement. Does it give individual members enforceable rights over the affairs of the LLP as a whole? If the answer is “the managing partner decides everything,” you have a Condition B problem that governance documents alone cannot fix without substantive amendment.
- Review remuneration structures against Condition A. Fixed draws that cover 80%+ of total expected remuneration are the trigger. If profit-related allocations are discretionary and not genuinely linked to overall LLP profits and losses, they may be characterised as disguised salary. The Macfarlanes analysis on Condition C also covers how capital contribution structures interact with this.
- Quantify the retrospective exposure. Model out your employer’s NIC liability for each of the last four to six years on the assumption that HMRC reclassifies your salaried partners. Know the number before your auditors or HMRC ask you for it.
- Check your Condition C capital contributions. Many LLPs used capital contribution arrangements to neutralise Condition C after 2014. Verify those arrangements still work — HMRC has scrutinised targeted anti-avoidance rule (TAAR) arrangements around capital contributions and the Crowe salaried members review guide explains what bona fide capital contributions look like.
- Do not wait for HMRC guidance to be updated. HMRC will revise its Partnership Manual in light of the Supreme Court judgment. But the revised guidance will reflect the new, narrower interpretation of significant influence. If you structured your analysis around the existing manual, your prior position may be weaker than you thought. Act on the judgment now, not on revised guidance when it appears.
The Wider Message for UK LLPs
BlueCrest chose to fight this all the way to the Supreme Court. Most LLPs do not have the resources or appetite to do that. The more important consequence of this judgment is that it removes any remaining ambiguity about HMRC’s legal authority to pursue salaried member reclassifications aggressively — and it gives HMRC a detailed, authoritative legal framework with which to do so.
The AIMA analysis of the Court of Appeal stage — now confirmed at Supreme Court level — is the clearest statement of what the investment management industry faces. But this is not only an asset management problem. If your business uses an LLP structure with mixed partner populations, the question is not whether you should review your position. The question is how quickly you can do it.
The CFO’s job is to know the material tax risks sitting inside the balance sheet — including contingent liabilities that have not yet been crystallised by an HMRC enquiry. BlueCrest is now the leading authority on what salaried members rules mean. Ignorance of that authority is not a defence.
Tanous Limited provides CFO advisory services.