When is a liquidated-damages clause enforceable rather than an unlawful penalty?
An agreed sum payable on breach is not unenforceable merely because it exceeds a precise forecast of loss. The modern test asks whether the detriment is out of all proportion to the innocent party's legitimate interest in performance of the primary obligation.
A liquidated-damages clause is enforceable unless the penalty rule applies and the stipulated detriment is out of all proportion to the innocent party's legitimate interest
First identify whether the clause imposes a secondary obligation arising on breach; the penalty rule does not regulate the fairness of a primary obligation. If it applies, identify the innocent party's legitimate interest in performance and assess proportionality when the contract was made. A reasonable pre-estimate of loss remains strong evidence of enforceability for an ordinary delay-damages clause, but it is not the exclusive test. Commercial certainty, project financing, management of difficult-to-quantify loss and other legitimate interests may be relevant. The label chosen by the parties is not conclusive.
| Issue | Position |
|---|---|
| Primary obligation | Penalty rule does not ordinarily apply |
| Secondary obligation triggered by breach | Penalty rule may apply |
| Reasonable pre-estimate of loss | Strong evidence, not the sole modern test |
| Legitimate performance interest | May extend beyond direct compensatory loss |
| Detriment out of all proportion | Clause is penal and unenforceable |
Start with the nature of the obligation
The penalty rule regulates a contractual consequence of breach, not every onerous payment or price term. The court first asks whether the provision creates a primary obligation or a secondary obligation activated by failure to perform another promise. A conventional obligation to pay delay damages after missing the completion date will usually be analysed as a secondary obligation.
The modern test
If the rule is engaged, the court identifies the innocent party's legitimate interest in performance and compares that interest with the detriment imposed on breach. The clause is penal only where the detriment is out of all proportion to that interest. Compensation remains central to many construction clauses, but legitimate interests can include commercial consequences that are difficult to price precisely.
Failure to prove a precise genuine pre-estimate does not automatically make the clause a penalty after Cavendish. The proportionality enquiry must be applied.
Dunlop: the traditional indicators
The traditional distinction is between a genuine agreed estimate of damage and a sum imposed to deter breach. It also records that a sum extravagant and unconscionable compared with the greatest conceivable loss indicated a penalty. Those indicators remain useful for straightforward damages clauses but are not a complete statement of the modern law.
Substance prevails over the label
Calling a provision "liquidated damages", "delay damages", "interest" or "penalty" does not determine its effect. The court construes the obligation and its commercial function. The clause should state a clear breach trigger, rate, period and cap, but enforceability depends on substance rather than drafting labels.
Jeancharm: an extreme interest rate
Late payment interest of 5 per cent per week produced an annual rate of approximately 260 per cent. The Court of Appeal treated the provision as a penalty. The result illustrates how an extreme detriment may fail even where the contract uses different terminology or contains obligations running both ways.
Cavendish and ParkingEye: the present test
The Supreme Court held that the penalty rule applies to secondary obligations arising on breach. The question is whether the detriment imposed is out of all proportion to a legitimate interest of the innocent party in enforcing the primary obligation. Both disputed provisions before the Court were upheld. The decision replaced use of a genuine pre-estimate as an exclusive universal test.
Armstead: confirmation of the modern approach
The Supreme Court restated that, under Cavendish, agreed damages must not impose a liability out of all proportion to the innocent party's legitimate interest. It observed that, for an ordinary compensatory clause, the modern and traditional approaches may produce the same result.
Assessment is made at contract formation
The clause is assessed by reference to the contract and circumstances when it was agreed, not merely by comparing the stipulated sum with the loss that happened to arise after breach. Actual loss may provide evidential context, but hindsight does not rewrite the bargain. Negotiation by commercially experienced parties is relevant, though it does not immunise a clause from the penalty rule.
Construction delay interests
| Interest | Possible relevance |
|---|---|
| Financing and revenue | Delayed occupation, rent, sales, production or operational income. |
| Project administration | Additional management, consultancy, security and insurance exposure. |
| Third-party commitments | Downstream liabilities, concession dates, tenant arrangements or funder conditions. |
| Reputation and service | Operational or public-service consequences that are difficult to value precisely. |
| Certainty | Avoiding later proof of diffuse or complex delay loss. |
| Sectional impact | Different parts may carry different interests and should be priced accordingly. |
Drafting and challenge analysis
| Issue | Evidence |
|---|---|
| Trigger | Identify the primary obligation and breach activating payment. |
| Rate and cap | Explain how the amount was derived and any maximum exposure. |
| Legitimate interest | Record the interests protected, including difficult-to-quantify consequences. |
| Proportionality | Compare the detriment with the protected interest across plausible breaches. |
| Commercial context | Record bargaining process, advice and available evidence. |
| Other remedies | Coordinate the clause with termination, general damages and indemnities. |
Practical controls
Prepare a contemporaneous damages and legitimate-interest assessment.
Use project-specific rates rather than an inherited percentage without analysis.
Distinguish primary payment obligations from breach remedies.
Consider different rates for sections or milestones where interests differ.
Set a rational cap and avoid multiple recovery for the same delay.
Retain the calculation, assumptions and approvals with the executed contract.
Apply the clause strictly in accordance with certification and notice machinery.
Authorities
| Authority | Citation | What it decides |
|---|---|---|
| Dunlop Pneumatic Tyre Co Ltd v New Garage and Motor Co Ltd | [1915] AC 79 | Traditional pre-estimate and extravagance indicators remain relevant to ordinary damages clauses. |
| Jeancharm Ltd v Barnet Football Club Ltd | [2003] 92 ConLR 26 | An extreme weekly interest provision was treated as penal. |
| Cavendish Square Holding BV v Makdessi; ParkingEye Ltd v Beavis | [2015] UKSC 67 | The modern test examines secondary obligations, legitimate interest and proportionality. |
| Armstead v Royal and Sun Alliance Insurance Company Ltd | [2024] UKSC 6 | The Supreme Court confirmed the modern legitimate-interest test. |