Average law firm profit margin in the UK, and what drives it

Published UK benchmarks put a typical law firm's net profit margin somewhere between the high twenties and low thirties per cent of fee income, before partners are paid. Armstrong Watson's 2024/25 review of its law firm clients reported 27.7% across all firms and 27% for firms with one to seven partners. After a fair salary for each partner, the true margin is much thinner.

That gap between the two numbers is the most important thing on this page, and most articles that rank for this question skip it. This is the pillar of our series on law firm economics. It is written as an operations guide, not accounting advice: how you calculate profit for your own books, and what it means for tax, is a question for your accountant.

What is the average profit margin for a law firm in the UK?

There is no single official figure. The Solicitors Regulation Authority does not collect profit data, and the Law Society does not publish a sector-wide margin. What exists are benchmarking surveys run by accountancy firms that act for law firms, each based on the firms that chose to take part. Treat each one as a well-informed sample, not a census.

The two most useful published sources at the time of writing:

• Armstrong Watson, Law Firm Benchmarking Review 2024/2025 (published February 2026). Net profit margin of 27.7% across its law firm clients, down from 32.8% the year before. Small firms (one to seven partners) reported 27%, down from 31.4%. Larger firms (eight or more partners) reported 31.2%. Net profit per equity partner was about £300,000.
• Law Society Financial Benchmarking Survey 2026 (published April 2026, produced by Hazlewoods). 121 firms in England and Wales with an average fee income of £9.9 million. It reports median profit per equity partner of £290,000, up 13%, and growth of 10.5% once interest earned on client money is stripped out. It does not publish a single margin figure in its public summary.

So the honest answer is: a small UK firm reporting a margin in the mid to high twenties, before partner drawings, is roughly where published benchmarks sit. Whether that is healthy depends on a question the headline hides.

Why do law firm profit margins look higher than they are?

Because in a partnership or a small owner-managed company, "profit" usually means what is left before the owners are paid for their own work. An equity partner who fee-earns full time is doing a job that would otherwise cost the firm a senior solicitor's salary. Most benchmark margins include that value in profit.

A simple way to see the real margin is to deduct a notional salary for each working partner, set at what it would cost to employ someone to do their job. Here is a worked example. Every number in it is invented for illustration.

• A hypothetical four-partner firm bills £2,000,000 in a year.
• Salaries, overheads and everything else cost £1,460,000.
• Reported net profit: £540,000, a margin of 27%.
• Each partner does work that would cost roughly £90,000 a year to replace, with employer costs. Four partners: £360,000.
• Profit after notional salaries: £180,000, a margin of 9%.

Both numbers are "the margin". The 27% is what a benchmark compares. The 9% is the return the owners earn for owning the firm rather than simply working in it, and it is the number that tells you whether the business, as a business, is paying for its risk. When you compare yourself with a published figure, make sure you are comparing the same thing.

Why did law firm margins look so strong in 2023 and 2024?

Interest on client money. When the Bank of England base rate rose, the interest firms earned on client account balances rose with it, and for many high street firms, especially conveyancers, it flattered profit considerably.

The Law Gazette's report on the 2026 Law Society survey noted that interest income across participating firms rose from £28 million in 2023 to £69.5 million in 2025, but grew only 11% in the latest year against 150% the year before. Its earlier coverage of the 2024 survey made the point sharply: with interest removed, median trading profit fell 7.9%, against the 0.7% fall reported with it included.

The operational lesson is simple. Interest is not a lever you control. When you look at your own margin trend, look at it with and without interest, and manage the one you can move.

What actually drives a law firm's profit margin?

Strip it down and a firm's profit is the product of five things. Each has its own post in this series.

• Hours that become chargeable. The Law Society 2026 survey reported a median of 807 chargeable hours per fee-earner, up from the previous year. Many firms plan on well over 1,000. The gap between the plan and the reality is where margin goes first. See billable hours in UK law firms and time recording in law firms.
• The rate you actually realise. Your rate card is not your rate. Write-offs, discounts and fixed fees that overrun all reduce what an hour earns. See law firm pricing strategies and how to price fixed fees without losing money.
• What it costs to deliver an hour. People, premises, insurance and systems. See law firm cost structure.
• How long the money takes to arrive. Profit on paper is not cash. See what WIP means in a law firm and law firm lock-up.
• The work you win in the first place. Every other lever acts on instructions the firm already has. The one most dashboards miss is the enquiry that never became an instruction because nobody answered the phone.

For context on size and whether the model works at all for small firms, see how much revenue a small UK law firm makes and are law firms profitable?.

How do you calculate your law firm's profit margin?

The arithmetic is simple. The discipline is in the definitions. Your accountant should confirm how these are treated in your own accounts; what follows is the operational version.

• Step 1. Take fee income for the period, net of VAT and excluding disbursements you pass straight to the client.
• Step 2. Separate interest on client money and show it on its own line.
• Step 3. Deduct every cost of running the firm, including salaries for everyone who is not an owner.
• Step 4. Divide what is left by fee income. That is your reported margin, comparable with most benchmarks.
• Step 5. Deduct a notional salary for each working owner and divide again. That is your economic margin.
• Step 6. Repeat by department, allocating shared overheads on a stated basis (headcount or fee income). Firms that do this for the first time usually find one department carrying another.

Step 6 is where the useful information lives. A firm-wide 25% can be a 40% private client team subsidising a family team that loses money on every fixed-fee divorce.

How can a law firm improve its profit margin?

Most advice on this question is a list of cost cuts. Costs matter, but in a professional services firm the larger levers are usually on the income side. In the order I would look at them:

• Find the leak before you raise the rate. Compare recorded time with billed time with collected cash, per fee-earner, per month. Each gap has a different cause and a different owner.
• Measure write-offs as a number, not a feeling. A fee-earner who routinely writes down 20% is either underquoting, overworking, or recording time the client was never going to pay for. You need to know which.
• Price for the work you actually do. Fixed fees protect margin only if you know your delivery cost per matter type.
• Shorten lock-up. It does not change profit, but it changes how much cash the partners must leave in the business to fund it.
• Stop losing instructions at the front door. An enquiry that reaches voicemail and rings the next firm costs you the whole margin on that matter, and it never appears as a cost anywhere. Our post on what missed enquiries cost a law firm walks through how to size it.

Which profit numbers should a managing partner watch monthly?

Profit itself is a year-end number. The monthly signals are the ones that predict it. I would keep six on one page:

• Chargeable hours recorded, by fee-earner, against plan.
• Billed value as a share of recorded value (realisation).
• Cash collected as a share of billed value.
• WIP days and debtor days, separately.
• Enquiries received and instructions won, by source.
• Interest on client money, shown on its own line so it cannot hide a trading trend.

The wider dashboard, including the front-of-firm numbers, is in the KPIs a managing partner should actually watch, and the case for running the firm as one revenue system is in revenue operations for law firms.

A trap: comparing margins across surveys

Published surveys use different samples, different years and different definitions. Armstrong Watson's summary reports staff costs at 38.9% of fee income; the Law Society's 2025 summary reported total salary costs at 63.5% of fee income. Those are not contradictory. They are almost certainly measuring different things (for example, whether partners' notional salaries are counted), and the published summaries do not set the definitions side by side. Before you benchmark, read how the survey defines each line, and rebuild your own figures to match.

Where does WasilX fit?

We work on the lever most profit discussions leave out: the instructions a firm never wins. Cam, our AI Engagement Coordinator, takes calls on the firm's line at any hour, says it is AI, asks the firm's own qualifying questions, books the call back and sends the firm a summary. Each fee-earner also has a personal assistant that covers their calls while they are in court and drafts matter updates for the fee-earner to approve, so time is not lost to status calls. If you want to see what that is worth on your own line, talk to us.

Frequently asked questions

What is a good profit margin for a small law firm in the UK? Published benchmarks put small firms in the mid to high twenties per cent before partners are paid. Armstrong Watson reported 27% for firms with one to seven partners in its 2024/25 review. What is good for your firm depends on how that compares once a fair salary for each working partner is deducted.

Do UK law firms publish their profit margins? Large LLPs file accounts at Companies House, and some firms publish figures. There is no official sector-wide margin; the SRA does not collect profit data. The best available figures come from benchmarking surveys by accountancy firms.

Why is profit per equity partner not the same as profit margin? Profit per equity partner divides profit by the number of owners, so it rises if a firm has fewer partners or more fee-earners per partner, even if the margin is flat. Margin divides profit by fee income. Watch both.

Does interest on client money count as profit? It usually appears in profit, and in 2023 and 2024 it lifted many firms' results. Show it on its own line so you can see whether the trading business is improving. How it is treated in your accounts is a question for your accountant.

What is the fastest way to improve law firm profitability? Usually by finding where recorded time fails to become billed and collected fees, and by winning more of the enquiries the firm already receives. Both act on work and demand the firm already has.