Liability caps are among the most contested clauses in professional engagement letters. A cap sets a ceiling on the amount a firm can be held to pay if a client sues for negligence or breach of contract. Common formulations include a fixed monetary limit (say £1m), a multiple of the annual fee (2x or 3x), or the higher of the two. The purpose is to help firms control their professional indemnity (PI) exposure, which in turn shapes premium and cover availability. The legal question is when a court will enforce them.
PI insurers price risk against a distribution of possible claim sizes. A firm capped at £1m or 3x fees presents a narrower loss distribution than one with uncapped liability. Where caps are enforceable and consistent with market practice, insurers frequently reflect that in premium and appetite. Where caps are drafted in a way a court would strike down, the insurer prices as if the cap did not exist.
Between commercial parties, the primary constraint is the Unfair Contract Terms Act 1977. Section 2(2) subjects a term that excludes or restricts liability for negligence (other than for death or personal injury under s.2(1), which cannot be excluded at all) to the reasonableness test in s.11. Section 3 catches exclusion or restriction clauses in written standard terms of business. Section 11 asks whether the term was a fair and reasonable one to include, having regard to circumstances known or reasonably contemplated when the contract was made.
Courts weigh several factors:
In Chester Hall Precision Engineering Ltd v Service Centres Ltd [2020] EWHC 3080 (Ch), the court reiterated that a well-drafted cap between commercial parties who had the opportunity to consider the term will generally survive the reasonableness test, even if the resulting recovery is materially less than the loss suffered.
Where the client is a consumer, the position is stricter. Under the Consumer Rights Act 2015 s.57, a trader cannot by a term of a contract exclude or restrict liability arising under the statutory implied term to perform the service with reasonable care and skill. A blanket cap that defeats a consumer's right to a remedy for a reasonable-care breach will not be enforceable. Firms with mixed books need to distinguish consumer and non-consumer engagements.
A net contribution clause limits the firm's liability to what would be recoverable if all other responsible parties paid their fair share, irrespective of whether the client can actually recover from them. That addresses proportionate rather than total exposure. See net contribution clauses in JCT construction contracts.
Underwriters generally welcome reasonable caps consistent with sector norms. Two firms with identical risk profiles can pay materially different premiums where one has a clean, defensible cap and the other has either no cap or one so aggressive a court would strike it down. Insurers also look at how the cap interacts with the statutory duty in SGSA 1982 s.13 to perform with reasonable skill and care — a cap that attempts to displace that duty entirely is a red flag. See SGSA 1982 s.13 and the reasonable skill and care standard.
The following is a worked example for illustration only. It is not advice on any particular firm or engagement.
An accountancy firm's engagement letter states: "the firm's aggregate liability is limited to £1m or three times the annual fees paid, whichever is the higher". The client is a mid-sized commercial company with turnover of around £40m and in-house financial and legal resource. Annual fees paid were £300,000. The client sues for £3m alleging negligent tax advice.
The court considers the cap under UCTA. It notes the client had the opportunity to negotiate, took external advice, and that the cap sits within the pattern reflected in the ICAEW model letter. The cap is found reasonable and enforced. The higher limb applies: 3 x £300,000 = £900,000. The firm's PI policy responds up to that figure. Absent the cap, exposure would have been up to £3m. The cap has saved £2.1m.
Firms may want to consider whether the cap tracks recognised sector norms, whether consumer engagements are handled separately, whether the letter records that the client had a fair opportunity to consider the cap, and whether the firm's broker has visibility of the current wording. Apex Insurance Brokers arranges PI cover across professional sectors including solicitors, accountants, independent financial advisers, architects, surveyors and consultants. Engagement letter wording sits alongside the policy in shaping how a claim plays out.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority. Firm reference number 724952. This entry is general information, not advice on any particular policy.