The Supreme Court has today released its long-awaited judgment in HMRC v BlueCrest Capital Management LLP (Salaried Members Rules), bringing to a close one of the most significant tax disputes affecting the UK asset management industry in recent years.

This decision represents the final stage in a line of litigation that has progressed through the First-tier Tribunal (FTT), the Upper Tribunal (UT), and the Court of Appeal (COA), all of which considered the application of the “salaried members rules” introduced in 2014.

Full details of the judgement can be found here: https://supremecourt.uk/cases/uksc-2025-0028

 

Background to the Case

The case concerns the application of the UK salaried members rules (Part 9A, ITTOIA 2005), which determine whether LLP members are treated as “self-employed partners” or “deemed employees” for tax purposes.

At earlier stages:

  • FTT (2022) – Found largely in favour of BlueCrest, concluding that the relevant LLP members did not satisfy the statutory conditions for being treated as employees.
  • Upper Tribunal (2023) – Upheld the FTT’s decision, endorsing the interpretation of key provisions, particularly regarding significant influence and disguised salary.
  • Court of Appeal (2025) – Reversed aspects of the earlier judgments, placing greater emphasis on the economic realities of the arrangements and narrowing the interpretation of the statutory tests.

The Supreme Court appeal has therefore been closely watched, particularly given the divergence between the lower courts on the interpretation of core elements of the regime.

Summary of the Supreme Court Judgment

Key findings of the Court

1. Significant influence must derive from legal rights (Condition B)

The Supreme Court confirmed that:

  • “Significant influence” must arise from legally enforceable rights and duties within the LLP framework
  • Influence based on de facto seniority, expertise, or commercial importance is not sufficient
  • The test focuses on influence over the affairs of the LLP as a whole, not merely over a business unit, desk, or portfolio

This aligns with the Court of Appeal’s position that the statutory language requires a formal, constitutional analysis, rather than a broad, practical one.

2. Narrow interpretation of partnership “influence”

The Court emphasised that:

  • Influence must be structural and governance-based
  • It typically requires participation in strategic decision-making, voting rights, or control mechanisms
  • Operational or investment discretion (e.g. portfolio management autonomy) does not, on its own, meet the threshold

This significantly limits the ability of LLPs to rely on functional roles to demonstrate significant influence.

3. Condition A (disguised salary) remains widely met

Although less contentious in the appeal, the Court endorsed the earlier tribunals’ approach:

  • Remuneration will qualify as “disguised salary” where it is fixed or linked primarily to individual performance
  • There must be a genuine and substantive link to overall LLP profits to fall outside Condition A

In practice, this means typical asset manager compensation models will often satisfy Condition A.

4. Rejection of a “substance over form” override

Importantly, the Court did not accept a broad purposive interpretation that would allow:

  • Informal or practical influence
  • Industry norms or commercial realities

to override the statutory requirement for legal rights and duties.

This confirms that the legislation operates as a rules-based test, not a general anti-avoidance standard.

Implications for UK Asset Managers

The Supreme Court’s decision has wide-ranging implications for LLP structures across the asset management sector:

1. Increased Scrutiny of LLP Member Structures

Firms operating LLP structures should expect continued scrutiny from HMRC, particularly where members:

  • Receive predominantly fixed or formulaic remuneration
  • Have limited governance rights or operational influence
  • Hold minimal economic risk through capital contributions

2. Reassessment of “Significant Influence”

The clarification around significant influence is likely to:

  • Narrow the scope for relying on functional or delegated roles alone
  • Require clearer evidence of genuine participation in strategic decision-making
  • Prompt firms to revisit governance arrangements and documentation

3. Remuneration Design Under Pressure

The Court’s guidance on disguised salary will have implications for:

  • Profit allocation models
  • Bonus and deferral arrangements
  • The alignment between remuneration and LLP-wide profitability

4. Capital Contribution Requirements

Firms may need to revisit:

  • The level of capital required to fall outside Condition C
  • The commercial reality and funding of capital contributions
  • Whether existing arrangements are robust under the Court’s clarified approach

5. Potential Retrospective Exposure

Where structures are found not to meet the statutory tests:

  • HMRC may seek to revisit prior years (subject to normal enquiry and assessment time limits)
  • There may be exposure to PAYE and NIC liabilities, together with interest and penalties.