A small, specialist niche. Proprietary trading firms, options market-makers, and limited liability partnerships sit at the intersection of partnership taxation, employment tax and complex revenue characterisation. Most accountants don’t see this work often enough to do it well.
Our principal adviser previously held tax roles at London prop-trading firms before founding The Tax Lead, and now combines that hands-on background with CTA and FCCA qualifications.
Proprietary trading firms — and the LLP structures most of them use — are unlike any other client type in UK tax. Trading P&L is taxed differently depending on whether HMRC treats it as a trading activity or an investment activity. Partner remuneration sits at the awkward intersection of partnership profit allocation and employment tax. The salaried members rules and mixed members rules can re-characterise partner income as employment income and re-allocate profits to a corporate member, with material consequences for both the firm and the individuals involved. None of this is taught well in standard tax training. It is mostly learned on the job — by working at one.
Our principal adviser spent time in tax roles at London prop-trading firms before founding The Tax Lead. The reason that matters isn’t credentialism — it’s that prop-trading partner taxation is the kind of work where a generalist accountant misses things that cost partners and firms five-figure sums per partner per year. We’ve sat on both sides of the table, and we know where the issues are.
Introduced in 2014 and applied with increasing rigour by HMRC, the salaried members rules treat a member of an LLP as an employee for tax purposes if all three of Conditions A, B and C are met — broadly, if at least 80% of the member’s reward is fixed (Condition A), the member has no significant influence over the affairs of the LLP (Condition B), and the member’s capital contribution is below 25% of expected disguised salary (Condition C). The consequences of being caught are significant: employer NIC at 15% on what was previously partner profit share, plus PAYE compliance, plus loss of the partnership profit characterisation. The rules are easy to fall into without realising and easy to plan around with proper structuring.
Where an LLP has a corporate member that is allocated a profit share, the mixed members rules can re-allocate that profit to the individual members if HMRC concludes the corporate member’s share is “excessive”. The rules require careful documentation of the corporate member’s actual contribution — capital, services or risk-bearing — and properly arm’s length profit allocation. We advise on structures and documentation that meet the threshold without inviting enquiry.
For prop trading and market-making activities, the line between trading income (taxable as profits of a trade) and investment activity (taxable under the chargeable gains rules with very different reliefs and timing) is often less clear than it looks. The badges of trade analysis matters. The volume, frequency, organisation and intent of activity all feed into the characterisation. For market-makers and arbitrage strategies, the answer is usually clear; for some discretionary or longer-hold strategies, less so. Getting this wrong in either direction creates large liabilities or missed reliefs.
How partner profit shares are determined, allocated, deferred and ultimately drawn affects both the timing and the rate of tax paid. Deferred profit allocations, “drawings vs allocations” reconciliation, capital accounts vs current accounts, and the tax treatment of partner exits all need to be structured properly. This work is typically continuous rather than one-off — the firm’s profit allocation methodology becomes the framework that drives the tax position year after year.
FCA-regulated trading firms face a tax overlay that intersects with regulatory capital, prudential reporting and the regulatory reporting framework. The interaction is most visible at year-end and at structural events — fundraising, partner admission, acquisition, FCA permission changes. We work alongside compliance and audit advisers when this is in scope.
This specialism is the right fit for:
It is not advertised heavily because the market is small and most engagements come through referral or prior relationship. If you’ve found this page through a search or through someone you trust, we’d welcome a confidential conversation.
This work is typically structured as either an annual advisory retainer (firm-side, covering the year-end profit allocation, partner tax planning and any structural questions arising) or as project-based engagements around specific events — a partner admission or exit, a structural review, an HMRC enquiry, an FCA-driven change. Fees are agreed upfront and on a fixed basis. We are deliberately selective about the engagements we take on in this niche — we’d rather work with a small number of firms well than spread thin across many.
Three areas of focus, plus full coverage of personal and business tax across all sectors.
Common questions on prop trading partnership tax. Engage us for a tailored review.
This work begins with a confidential, no-obligation conversation. We will discuss the firm structure, the partner profile, and where we can usefully help — without pressure to engage.
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