Law Firm Partnership Tax: The Complete UK Guide for Partners

Law firm partnership tax has one rule that sits above all the others: a partnership and an LLP are tax-transparent, so each partner is taxed personally on their share of the profit, not on the cash they happen to draw. Get that right and most of the rest follows. Get it wrong and partners are surprised by a tax bill on money they left in the firm. This guide walks through how the partnership is taxed, how the profit is allocated, what each partner reports on their own return, how National Insurance now works, and the one point where an LLP member can be pulled into the PAYE net.

It covers the structure most UK firms use, the general (traditional) partnership and the LLP. If you are weighing one against the other, or you want the deeper mechanics of how a single member is taxed, see our companion guides on the tax differences between an LLP and a traditional partnership and on how LLP members are taxed. This page is the broad overview that ties them together.

How a law firm partnership is taxed: transparency in one paragraph

A general partnership (under the Partnership Act 1890) and an LLP (under the Limited Liability Partnerships Act 2000) are both tax-transparent. The entity itself pays no income tax or corporation tax on its trading profit. Under ITTOIA 2005 (s.863 for an LLP, s.850 for the allocation of profit), all the firm's activities are treated as carried on in partnership by the individual partners, and each partner is taxed as a self-employed person on the share allocated to them.

The partnership does file a return, the Partnership Tax Return (SA800), but that return does not generate a tax bill for the partnership. It reports the firm's total profit and shows how that profit is split between the partners. Each partner then carries their share onto the partnership pages of their own Self Assessment (SA100) and pays income tax and Class 4 National Insurance on it. Only the individual partners have a tax liability; the firm does not.

You are taxed on your profit share, not your drawings

This is the point that trips up more partners than any other. Drawings are simply cash advances against your profit share; they are not what you are taxed on. If your allocated share is higher than what you drew, you still pay tax on the full allocation, and the retained balance sits in the firm as working capital. If you drew more than your share, you have overdrawn against your capital account, but that does not reduce the tax.

Take an anonymised four-partner firm that makes £800,000 of profit and splits it equally. Each partner is taxed on £200,000, full stop. If one partner drew only £120,000 during the year because the firm needed to fund a new office, that partner is still taxed on the whole £200,000 allocation. The £80,000 they left in is taxed now and drawn later. Planning your drawings around your tax payments, rather than the other way round, is the core cash-flow discipline of partnership life.

Allocating profit between partners

How a firm splits its profit drives each partner's tax bill, so the allocation has to be both genuine and documented. Most law firms use one of three approaches, or a blend: equal shares between full-equity partners; a points or lockstep system that weights seniority, billing or business generation; or a fixed share for more junior partners (a prior allocation off the top before the balance is split).

The partnership agreement should set out the method clearly. HMRC will generally accept the split shown in the partnership accounts and the SA800, provided it reflects the real commercial arrangement between the partners. Two cautions are worth flagging.

First, where a firm has both a prior share (a fixed amount) and a balance split by percentage, the order of allocation matters and the agreement should make it explicit, because the fixed slice is taken before the percentages apply. Second, a firm that allocates profit to a corporate member (a company brought in as a partner so profit is retained at the corporation-tax rate) needs to be aware of the mixed-membership partnership rules (ITTOIA 2005 ss.850C to 850E). Those rules reallocate any profit given to the company that exceeds its genuine commercial return back to the individual partners and tax it on them. A corporate member is not a clean way to halve a partner's tax, and aggressive profit-parking does not survive contact with HMRC.

Salary plus profit share arrangements

Some firms pay a partner a fixed amount described as a "salary" alongside a percentage of the profits. For a genuine partner this is not employment income; the fixed slice is a prior profit share and is taxed as self-employment income along with the rest, subject to Class 4 NIC, not PAYE. The exception is where an LLP member is caught by the salaried member rules, covered below, in which case the reward is taxed as employment income.

The basis period: how partnership profit lands in a tax year

Under basis period reform (Finance Act 2022), partnerships moved to the tax-year basis from 2024/25, with 2023/24 as the transition year. Profit is now taxed for the actual tax year (6 April to 5 April), regardless of the firm's accounting date.

A firm with a non-31-March or non-5-April year end (a December or April-30 year end, for instance) had a transition. The catch-up profit from the old basis date to 5 April 2024, net of any unused overlap relief, is the "transition profit", and it is spread over five tax years (2023/24 to 2027/28) unless the firm elects to accelerate. Many long-serving partners have little or no overlap relief, so the transition can bring a one-off extra charge. That is a timing and cash-flow point, not a permanent increase. Our dedicated note on basis period reform for law firms works through the mechanics.

Each partner's personal tax obligations

Beyond the profit share itself, each partner has their own compliance and payment obligations. These run alongside the SA800, not instead of it.

Self Assessment and payments on account

Every partner files an annual Self Assessment return that includes their partnership income. The deadlines are 31 October for a paper return and 31 January for online filing, with the balancing payment due by 31 January. Because partnership profit is self-employment income, partners also make payments on account, two instalments due on 31 January and 31 July, each broadly half of the prior year's liability. New partners in a growing firm should expect the second-year cash demand to be heavier than the first, because the payments on account top up alongside the balancing payment.

National Insurance: Class 4 only, Class 2 removed

Partners pay National Insurance as self-employed individuals, and the position changed materially from 6 April 2024. For 2025/26:

• Class 4 NIC is charged at 6% on profits between £12,570 and £50,270, then 2% on profits above £50,270.
• Class 2 NIC is no longer a weekly charge. Class 2 liability was removed from 6 April 2024. A partner with profits at or above the Small Profits Threshold is treated as having paid Class 2 and keeps their state pension entitlement, so there is no payable weekly Class 2 figure to budget for.
• A partner with profits below the Small Profits Threshold can still pay voluntary Class 2 to protect their contributions record if they want to.

If you have seen older guidance quoting a Class 2 figure of a few pounds a week on top of Class 4, that figure is out of date for any year from 2024/25 onwards. Unlike employees, partners get no employer National Insurance paid on their behalf, which is one reason pension planning carries more weight for a partner than for a salaried associate.

The salaried member rules: when an LLP member is taxed as an employee

One point separates an LLP from a traditional partnership on the tax side, and every LLP partner should understand it. The salaried member rules (Finance Act 2014, inserting ITTOIA 2005 ss.863A to 863G) apply to LLPs only. They can re-classify an LLP member as an employee for tax, bringing PAYE and employer National Insurance on their reward, but only where all three of the following conditions are met. Fail any single one and the member remains self-employed:

• Condition A, disguised salary (s.863B): at least 80% of the member's reward is fixed, or varies without reference to the firm's overall profits or losses.
• Condition B, significant influence (s.863C): the member does not have significant influence over the affairs of the LLP.
• Condition C, capital contribution (s.863D): the member's capital contribution is less than 25% of their disguised salary.

In practice the rules catch fixed-share and salaried members whose reward is largely fixed and who have put in little capital. A full-equity partner whose reward genuinely rises and falls with the firm's profit usually fails Condition A and is never in scope. The usual way to keep a fixed-share member self-employed is to fail one condition deliberately: make more than 20% of their reward genuinely profit-dependent, give them real influence over the firm, or have them contribute capital of at least 25% of their disguised salary that is genuinely at risk. Substance governs, not the partner's title. For the full treatment, see our explainer on the salaried member rules for UK LLPs.

If the firm is incorporated: a different tax regime

A minority of firms operate through a company or ABS rather than a partnership or LLP. Incorporation changes the tax regime completely. The company pays corporation tax (19% on profits up to £50,000, 25% on profits above £250,000, with marginal relief between, for FY2025 and FY2026), and the owners extract profit by a mix of salary and dividend rather than being taxed on a profit share.

Dividend tax rates carry a tax-year tag, and they change from 6 April 2026:

• 2025/26: ordinary rate 8.75%, upper rate 33.75%, additional rate 39.35%, with a £500 dividend allowance.
• From 6 April 2026 (Finance Act 2026 s.4): ordinary rate 10.75%, upper rate 35.75%, additional rate 39.35% (unchanged), allowance still £500.

The 2026/27 dividend increase narrows the gap that once made incorporation look like an automatic win, so the company route should be modelled against the loss of tax transparency and the partner's own pension and NIC position, not assumed. Incorporating an SRA-regulated firm is also a regulatory step, not just a tax one: the company or LLP must be authorised by the SRA as a recognised body (or, with non-lawyer ownership, licensed as an ABS under Part 5 of the Legal Services Act 2007), and the firm must appoint a COLP and a COFA.

Pension contributions for partners

Partnership profit counts as relevant earnings for pension purposes, so partners can make substantial contributions with tax relief at their marginal rate. The annual allowance is £60,000 (or 100% of relevant earnings if lower), subject to tapering for very high earners and to any unused allowance carried forward from the previous three years.

Because a partner gets no employer pension contribution, building a personal pension is the partner's own job, and the relief is valuable: for a partner taxed at the 45% additional rate, a £40,000 personal contribution attracts £18,000 of tax relief. For the detail on how partners claim that relief and interact with payments on account, see our guide to tax relief on partner pension contributions.

VAT in a law firm partnership

Most law firms are VAT-registered, because the registration threshold is £90,000 of taxable turnover and typical legal fees clear it easily. Legal services (advice, conveyancing, litigation, drafting) are standard-rated at 20%; there is no exemption for residential conveyancing.

The recurring VAT issue for a firm is the disbursement-versus-supply test. A third-party cost only escapes VAT as a true disbursement if all eight conditions in VAT Notice 700 are met, broadly that the firm paid as the client's agent, the client received and was responsible for the cost, and the firm recovers only the exact amount and itemises it separately. Court fees, Land Registry registration fees and the property transaction tax (SDLT, LBTT or LTT) paid for the client are the clean disbursements. A property search fee that the firm interprets in its own advice is not a disbursement (following Brabners LLP v HMRC), and bank or CHAPS transfer fees the firm's own bank charges are standard-rated recharges. VAT records also sit alongside, but separate from, the SRA Accounts Rules that govern client money: client money is never the firm's income.

Partners joining and leaving: the tax consequences

Changes in the partnership create specific tax events that the agreement should handle in advance.

Admitting a new partner

Bringing in a new partner usually means sharing future profits rather than selling existing assets. The new partner is taxed on their profit share from their admission date. If they pay for goodwill or a partnership interest, that payment can create a capital gain for the existing partners. The agreement should set out the admission-year allocation and any capital buy-in clearly, and a partner funding the buy-in with a personal loan may get income tax relief on the loan interest under ITA 2007 ss.398 to 412.

A partner retiring or leaving

A departing partner stops being taxed on partnership profit from their leaving date, with the year's profit usually apportioned to the date of exit. They may have a capital gain on partnership assets, including goodwill if the practice is later sold, and may be able to claim Business Asset Disposal Relief on a qualifying disposal of their interest. Because a partnership and an LLP have no shares, any sale of the firm is an asset sale rather than a share sale, which makes the split between capital assets (goodwill) and trading income (work in progress and debtors) a central drafting point in the sale agreement.

Common compliance pitfalls

A handful of avoidable mistakes account for most of the penalties and enquiries that hit law firm partnerships.

Late SA800 filing attracts an automatic penalty of £100 per partner for a return up to three months late, rising for longer delays. For a six-partner firm a single late return is £600 before any further penalties, so the partnership deadline deserves the same diary discipline as each partner's own return.

Allocations that do not match reality invite HMRC enquiry. The split in the SA800 must mirror the partnership agreement and the actual profit-sharing arrangement, and every partner should agree their figure before the return goes in. A particular risk is treating a partner's reward as employment or self-employment income without checking the salaried member position for an LLP.

Weak record-keeping becomes more exposed under Making Tax Digital for Income Tax, which applies to partners with qualifying income above £50,000 from 6 April 2026 and brings digital records and quarterly updates. A firm that has tightened its bookkeeping ahead of MTD will find the transition far smoother than one scrambling at the deadline.

Where specialist advice earns its keep

Law firm partnership tax sits at the intersection of partnership law, tax legislation and SRA regulation, and the points where they interact (admitting partners, restructuring profit shares, weighing incorporation, planning a sale or succession) are exactly where a generic accountant tends to miss the legal-sector specifics. An accountant who works with solicitors understands the SA800 and the salaried member rules, but also the SRA Accounts Rules, work-in-progress recognition and the regulatory authorisation that any structural change has to satisfy.

If you are deciding between a traditional partnership and an LLP, modelling a corporate member, or planning how partners draw and pay tax across a transition year, that is the moment to take advice that is built around how a law firm actually runs.