What an In-House Lawyer Really Costs in the UK

Salary is the number on the offer letter. It is not the number that lands on the P&L. Here is the arithmetic a founder needs before signing off a first legal hire.

The salary is the opening bid, not the total

A founder who has priced a first legal hire off a job advert has priced roughly seventy per cent of the actual cost. The salary line is the number candidates negotiate over. It is not the number that lands on the payroll run, and it is a long way from the number that lands on the P&L once the statutory additions, the insurance, the tooling and the management time are counted.

What statute adds automatically

Take an illustrative salary of £80,000 — the figure itself doesn't matter, the arithmetic does. From 6 April 2025, employer National Insurance is charged at 15% on earnings above a secondary threshold of £5,000 a year, up from a rate of 13.8% and a threshold of £9,100 the year before. On an £80,000 salary that is £75,000 of chargeable earnings, so £11,250 in employer NI alone.

Then there's the pension. Automatic enrolment requires a minimum employer contribution of 3% of qualifying earnings — earnings between £6,240 and £50,270 for 2025/26. On this salary that's 3% of £44,030, or just over £1,320. Many employers actually calculate contributions on full basic pay rather than the qualifying band because it's simpler to administer, which pushes the pension cost closer to £2,400.

Add those two lines together and the employer has already spent somewhere between £12,500 and £13,600 above the £80,000 salary before anyone has switched on a laptop — roughly 16 to 17% on top, before a single non-statutory cost is counted.

There is some relief available. The Employment Allowance lets eligible employers reduce their employer NI bill by up to £10,500 a year, and the £100,000 prior-year NI threshold that used to gate access to it was removed from April 2025. A founder-led business hiring its first legal counsel may well qualify — but the allowance is claimed once across the whole payroll, not per hire, so if it's already being used against other staff it won't soften this particular number.

Scale-ups further along should also note the Apprenticeship Levy: employers with an annual pay bill over £3 million pay it at 0.5% of their total pay bill. It isn't triggered by a single legal hire, but it's part of the same payroll arithmetic once a business is that size.

Holiday pay sits inside the salary rather than on top of it, but it's worth naming because it explains why the salary buys fewer working weeks than it looks like it does. Full-time workers are entitled to a statutory minimum of 5.6 weeks' paid leave a year — over ten per cent of the year paid for without anyone drafting a contract or negotiating a lease.

The costs that never appear on the offer letter

None of the following show up in a recruitment ad, and none of them are optional in practice.

Insurance. A lawyer working at senior level, whether general counsel or head of legal, usually sits inside a business's directors' and officers' cover and often needs professional indemnity considerations built around what they're authorised to sign off. That's a conversation with the insurer, not a fixed fee, but it moves the premium.

Training and professional subscriptions. A solicitor or barrister keeping their qualification current needs continuing competence records, and a functioning legal function needs access to case law and precedent databases — Lexis, Practical Law or equivalent — priced per seat, and not cheap at a single-user rate.

Management overhead. Someone has to manage the lawyer — set objectives, review output, handle the one-to-ones, cover for them on leave. For a founder that's usually the founder's own time, which is the most expensive resource in the business, not the cheapest.

Recruitment. Finding and vetting a genuinely good in-house lawyer, as opposed to a plausible one, is not free — whether that cost is an agency fee, a run of paid advertising, or the founder's own hours sitting in interviews instead of running the business.

The cost of getting it wrong

A vacant legal seat is not a neutral state — contracts still need signing, disputes still land, and in the gap the founder either does the work themselves or the business carries the risk unmanaged. A bad hire is worse: notice pay runs whether or not the fit is working.

Under current law, an employee generally needs two years' continuous employment before they can bring an unfair dismissal claim, which is one reason founders sometimes assume the first two years carry limited risk. That assumption is about to date badly: the Employment Rights Bill proposes removing the two-year qualifying period and introducing day-one protection against unfair dismissal, which changes the calculation on every hire made from the point it takes effect.

And if the role turns out not to be needed at the level it was hired for, a fair redundancy process sits on top of everything already spent — process, pay, and the time it takes to run properly.

Where a specialist is needed

Structuring the employment contract, running a redundancy process fairly, or getting the tax treatment of benefits and pension contributions right are not judgement calls a generalist should be making alone. Dinmore Bell instructs employment counsel and tax specialists for exactly those points, holding the budget and the outcome so the founder has one call to make rather than three separate suppliers to manage.

The comparison that actually matters

Once the statutory additions, the insurance, the tooling and the management time are counted, a single senior in-house hire regularly costs 25 to 40% above the headline salary — and that's before pricing the risk of a vacant seat or a hire that doesn't work out. Set against that, a retained function on a fixed monthly fee that flexes with what the business actually needs that quarter looks like a different kind of arithmetic entirely — the subject of Dinmore Bell's companion piece on the loaded cost of legal work.