The Supreme Court just looked straight through a £22.5m label
A foreign exchange firm called it capital, five justices called it pay, and that gap between what a payment is named and what it is actually for is where most tax disputes really live. What HFFX decided on 17 June, and why the same question turns up on far smaller files.
On 17 June the Supreme Court handed down HMRC v HFFX LLP, decided alongside Atkins and others v HMRC and reported together as [2026] UKSC 17. Lord Sales gave the lead judgment, the decision was unanimous, and HMRC won, so a bill of around £22.5m stood.
The structure behind that bill is more common than the headline suggests. HFFX was a trading firm inside the GSA group, set up in 2010 and making its money in foreign exchange, and its members included both individual traders and a corporate member. The firm wanted to reward its traders for their strong years but to soften the tax on the way, so it ran a Capital Allocation Plan.
The mechanics are worth following carefully, because they are the whole case. Trading profits went first to the corporate member, where they met corporation tax at the lower rate, and then they sat there. Later, in a different tax year, the same amounts were reallocated to the individual traders, only this time they were labelled "special capital." The traders' argument followed naturally from that label, because if the money had already been taxed inside the company and what they received was capital rather than income, then taxing it again would mean taxing a single pot twice.
Every tribunal disagreed, and they did so consistently. The First-tier Tribunal, the Upper Tribunal, the Court of Appeal and now the Supreme Court all reached the same conclusion, which was that the "special capital" was not really capital at all. It was deferred and contingent reward for the traders' work, routed through a company on its way to them, and so it was taxable as income under the miscellaneous income charge, with the mixed-membership partnership rules introduced in 2014 doing the heavy lifting. The whole case sits in one sentence, because the court simply followed the money back to the thing it had paid for.
The label was real, and it still lost
What makes this judgment so useful is that nothing in it was a sham. The corporate member genuinely existed and the capital account entries were real, and the court never suggested otherwise. The point the justices made is quieter than a fraud finding, and it travels much further than any hedge fund, because a payment is taxed according to what it is for rather than the heading under which it is filed. You can route money through a company, but you cannot route it past its own substance.
HFFX runs on the same issue as Odey Asset Management LLP and others v HMRC [2021] UKFTT 31 (TC), where a comparable special capital arrangement was put through a Partner Incentivisation Plan, and read together they draw a firm line under a decade of this kind of planning. The arrangements were sophisticated and carefully built, but in the end they were reward for work, and reward for work is income.
The same question, on much smaller files
Most firms reading this will have no client running anything as elaborate as a Capital Allocation Plan, and that is not the reason to care. The reason to care is that the same move turns up in far plainer forms, whether it is a payment described as a loan that nobody really expects to see repaid, a dividend timed to stand in for salary, a capital introduction that looks a great deal like deferred wages, or a director's loan account that quietly drifts year after year.
The numbers are smaller and the structures simpler, but HMRC asks exactly what it asked HFFX, which is what the payment was actually for and whether the label matches the work behind it. HFFX confirms at the highest level that the label loses, because when the paperwork and the economic reality point in different directions, it is the paperwork that gives way.
It is worth asking that question before HMRC does, so for any payment sitting under a favourable heading, the test is simply whether there is real evidence that the heading is true. If the honest answer is that it was reward for the work and merely structured kindly, then the Supreme Court has now said where that road ends, because a firm can keep its records however it likes but it cannot choose how they read.
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