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For anyone who advises asset managers, City LLPs or partners on how remuneration is structured and taxed, the Supreme Court's decision of 17 June 2026 in HMRC v HFFX LLP [2026] UKSC 17 is required reading. It is the latest word — alongside the BlueCrest litigation — on how the tax system treats deferred and contingent remuneration routed to LLP members through a corporate vehicle.

What the case was about

HFFX LLP was a highly successful foreign-exchange trading firm within the GSA group, with a team led by Alexander Gerko (later of XTX). To distribute its large trading profits to members in a tax-efficient way, HFFX operated a Capital Allocation Plan (CAP) — found by the tribunals below to have the avoidance or reduction of tax as one of its main objects, alongside genuine commercial purposes such as retaining and incentivising members.

In outline, the CAP worked like this: roughly half of the profits that might otherwise have been allocated to participating individual members was instead allocated to a corporate member, GSA Member Limited (GSAM) (its share held via a Cayman trust). GSAM paid corporation tax, invested the net amount, and over three years contributed the proceeds back to HFFX as "Special Capital," which was then reallocated to the individual members at GSAM's discretion — but only to members who stayed (departing "bad leavers" lost out).

Two questions reached the Supreme Court:

1. HMRC's appeal — whether the partnership profits allocated to GSAM should instead be reallocated to, and taxed in the hands of, the individual members under section 850 ITTOIA (the rule on allocating partnership profits for income-tax purposes). 2. The individual members' appeal — whether the deferred remuneration they ultimately received was taxable as their income under section 687 ITTOIA ("charge to tax on income not otherwise charged") or under the "sales of occupation income" rules in Chapter 4 of Part 13 of ITA 2007.

What the Supreme Court decided

Giving the lead judgment, Lord Sales dismissed both appeals:

  • HMRC's section 850 argument failed. There was no relevant overlap or double taxation between the trading profits (taxed in the partnership/GSAM's hands) and the deferred remuneration received by the individual members; the deferred remuneration was treated as distinct from the underlying trading profits, paid out of GSAM's funds. The Court declined to stretch the purposive approach to interpretation far enough to reallocate the profits under section 850.
  • The individual members' appeal also failed — meaning the deferred remuneration they received was taxable in their hands under section 687 ITTOIA as income not otherwise charged.

The Court reserved its opinion on the "sales of occupation income" regime in ITA 2007, which it did not need to decide.

Why it matters

The practical bottom line favours HMRC where it counts: the deferred remuneration the members actually received did not escape income tax — section 687 caught it. But HMRC did not succeed on its preferred route of reallocating partnership profits under section 850, and the judgment is notably careful about the limits of the purposive approach to construing tax-charging provisions.

For advisers, several takeaways stand out:

  • Routing members' remuneration through a corporate partner does not, by itself, take it outside the income-tax net. Section 687 remains a powerful sweep-up where deferred awards are ultimately received by the individual.
  • Section 850 has limits as a reallocation tool. HMRC could not use it to tax the corporate member's profit share in the individuals' hands on these facts.
  • Read alongside BlueCrest, this is now a leading authority on the taxation of contingent and deferred LLP/partnership remuneration — directly relevant to hedge-fund and asset-manager structuring, and to any LLP using corporate-member or "special capital" mechanisms.

Anyone advising on partner remuneration, LLP deeds or deferred-comp arrangements should factor HFFX into their analysis now.

Research on Search the Law

Research the partnership and remuneration-tax authorities on Search the Law:

LLP members' deferred remuneration and s.687 ITTOIAallocation of partnership profits under s.850

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