Complete Partnership & LLP Tax Guide for UK Law Firms

Being promoted from fixed-share (or salaried) partner to full equity partner in a UK law firm is, for tax, a change of status rather than just a pay rise. This guide walks the event in order: the exit from the salaried member rules, the switch from PAYE to self-assessment, the capital buy-in you now have to fund, the qualifying-loan interest relief on funding it, and the first-year payments-on-account cash shock. Figures are 2025/26.

A partner's capital account and current account do two different jobs, and confusing them causes most avoidable tax errors at partner level. This guide explains the capital account (the buy-in investment), the current account (undrawn profit), why a capital contribution is not taxable income, why interest on capital is taxed as profit share rather than savings interest, and why returning capital on exit is not income. Figures are 2025/26.

As a self-employed law firm partner you are taxed on your allocated profit share, not the cash you draw, and the bill arrives in lumps through payments on account. This guide explains payments on account precisely (TMA 1970 section 59A), builds a defensible reserving rule band by band, and walks the basis-period transition-profit squeeze still being collected to 2027/28. It closes with the lock-up reality of owing tax on profit tied up in WIP and debtors. Figures are 2025/26.

Basis period reform moved law firm partnerships and LLPs to a tax-year basis from 2024/25, with 2023/24 the transition year. The transition affects profit allocation and can create one-off tax bills for partners with little overlap relief.

The single biggest cash-flow trap for law firm partners is assuming tax follows drawings. It does not. You are taxed on your allocated profit share even on profit you never drew. Here is how to reserve for it and manage the gap.

How UK law firm partnerships and LLPs are taxed: profit allocation, the partnership return (SA800), each partner's personal Self Assessment, Class 4 National Insurance and the salaried member rules. The single rule to remember is that you are taxed on your profit share, not on the cash you draw.

How partners, LLP members and incorporated-firm owners extract profit from a UK law firm, the tax that applies to each route, and how the CGT and Business Asset Disposal Relief position works on an eventual sale.

There is no general employer National Insurance charge on LLP member profit shares, and Finance Act 2026 did not introduce one. LLP members are self-employed for NIC and pay Class 4 contributions. The only route to an employer NIC cost is the salaried member rules. This guide explains the genuine position, how to keep membership self-employed, and the 2026 change that does affect incorporated firms.

An LLP is tax-transparent, so each member is taxed as a self-employed partner on their allocated profit share, not on the cash they draw. This guide covers the income tax and Class 4 NIC charge (Class 2 was abolished from 6 April 2024), payments on account, the salaried member rules, mixed-membership structures, and the planning points that catch law firm partners.

At member level, an LLP and a traditional partnership are taxed identically: both are tax-transparent, so each partner or member pays income tax and Class 4 NIC on their allocated profit share, not on drawings. The single genuine tax divergence is the salaried member rules, which apply only to LLPs and can pull a member into PAYE when three conditions are met.

Profit allocation is how a law firm decides each partner's share of the firm's profit: fixed share, equity points, lockstep or merit. The share you are allocated, not the cash you draw, is what you are taxed on, and an allocation that is too fixed can trigger the salaried member rules.

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Essential guide covering partnership tax obligations, profit allocation, accounts preparation and compliance requirements for UK legal partnerships.