Discharge by performance and breach

Discharge by performance is the primary and most straightforward mode by which parties extinguish their contractual obligations. A party who performs all that the contract requires is entitled to the agreed consideration and is freed from further liability. Yet performance is rarely as simple in practice as in theory. The common law developed an austere starting-point—the entire obligation rule—which denied any payment to a party who failed to perform in full, even if the deficiency was trivial. Equity and modern statute have mitigated the harshness of that rule, but it remains the default position absent agreement or established exception.

Breach, by contrast, arises when a party fails to perform a contractual obligation or indicates in advance that it will not do so. Not all breaches justify termination; only repudiatory breach—breach of condition, breach that goes to the root of the contract, or renunciation—entitles the innocent party to treat the contract as at an end and claim damages for total failure. Lesser breaches sound only in damages. Anticipatory breach occurs when, before the time for performance, one party by words or conduct evinces an intention not to be bound; the innocent party must then elect whether to accept the repudiation immediately or to affirm the contract and await the due date.

This topic synthesises the law of tender and time (covered in an advanced course on performance) with the classification of terms (which students will have encountered in relation to conditions and warranties in week 4) and the remedial consequences of breach (to be explored in the final two weeks). Mastery requires close attention to statutory intervention—particularly the Sale of Goods Act 1979 and the Supply of Goods and Services Act 1982—and to the tension between predictability and fairness in the case law.

The entire obligation rule is a creature of eighteenth-century assumpsit. In Boone v Eyre (1779) 1 H Bl 273n, a purchaser of a plantation and slaves covenanted to pay an annuity; the seller covenanted that he had good title to the slaves. Lord Mansfield held that the covenants were independent: the buyer's obligation to pay did not depend on the seller's full performance. But the judgment acknowledged that in other cases—especially building and service contracts—full performance was a condition precedent to payment. This latter category came to be known as entire contracts.

The severity of the entire obligation rule was demonstrated in Cutter v Powell (1795) 6 TR 320. A seaman contracted to serve on a voyage from Jamaica to Liverpool for thirty guineas, payable on arrival. He died at sea nineteen days before the ship docked. His widow's claim failed: no payment was due for partial performance of an entire contract. The rule reflected the freedom-of-contract ideology of the period and the judicial reluctance to rewrite bargains. In an era when the terms of standard-form employment and construction contracts were negotiated by parties of roughly equal sophistication, the law refused to grant relief for hardship arising from one's own default.

By the mid-nineteenth century, courts began to temper the rule. Equity developed the doctrine of substantial performance—first recognised in Dakin & Co Ltd v Lee [1916] 1 KB 566—which allowed a party who had nearly completed to recover on a quantum meruit, subject to a deduction for defects. Statute intervened with the Apportionment Act 1870, permitting apportionment of rent and certain other periodic payments. The Law Reform (Frustrated Contracts) Act 1943, though primarily concerned with frustration, influenced thinking about restitution for partial performance. In modern law, the entire obligation rule persists, but is cabined by exceptions, statutory reform, and express contractual provisions for stage payments.

Anticipatory breach was firmly established in Hochster v De la Tour (1853) 2 E&B 678, where the defendant, who had agreed to employ the claimant as a courier from 1 June, repudiated the contract in May. The court held that the claimant could sue immediately without waiting for the performance date, a pragmatic innovation that avoided forcing the innocent party to remain in limbo. The doctrine was refined in White & Carter (Councils) Ltd v McGregor [1962] AC 413, which held that an innocent party could affirm a repudiated contract and perform it, then claim the agreed price—subject to a controversial limitation concerning legitimate interest.

The entire obligation rule

The starting-point is that a party who fails to complete performance of an entire obligation cannot recover either the contract price or a restitutionary sum for the benefit conferred. The classic illustration is Cutter v Powell. The rule rests on the premise that parties have expressly or impliedly agreed that full performance is a condition precedent to payment. It promotes certainty and allocates the risk of non-completion to the performing party. A party who breaks an entire obligation commits a repudiatory breach, entitling the other party to terminate and refuse payment.

Whether a contract contains an entire obligation is a question of construction. Courts consider:

• express language (e.g. 'payment on completion');
• the structure of the bargain (lump-sum versus stage payments);
• industry practice;
• the nature of the work (building contracts are traditionally entire; service contracts for long periods are often divisible).

In modern commercial construction contracts, the entire obligation rule is typically displaced by interim certificates and retention clauses.

Substantial performance

The doctrine of substantial performance, articulated in Hoenig v Isaacs [1952] 2 All ER 176, permits a contractor who has completed the work save for minor defects to recover the contract price less the cost of remedying those defects. The test is whether the defects go to the substance of the contract or are merely incidental. In Hoenig, a decorator supplied and fitted furniture for £750; the finished work had defects costing £55 to remedy. The Court of Appeal held that the claimant had substantially performed and could recover £695.

By contrast, in Bolton v Mahadeva [1972] 1 WLR 1009, a central-heating system installed for £560 cost £174 to remedy and did not heat the house adequately. The Court of Appeal held that there had been no substantial performance: the defects were not trifling, and the contractor recovered nothing. The doctrine does not apply where the innocent party has no opportunity to reject—such as where work is done on the innocent party's land—because in such cases a restitutionary claim may lie for the value of the benefit conferred (Sumpter v Hedges [1898] 1 QB 673).

The doctrine is controversial. It mitigates the rigour of the entire obligation rule but blurs the line between breach of condition and breach of warranty. It may encourage shoddy work. In practice, commercial parties draft around it by specifying retention sums and defect-liability periods.

Divisible and severable obligations

The case law on performance and breach is rich and fact-sensitive. The cases below form the doctrinal spine of this topic and are essential for tutorials and examination.

Cutter v Powell established the entire obligation rule in its starkest form. The seaman's widow could not recover for partial performance of an entire contract; the contractual allocation of risk was upheld. The case remains controversial for its perceived harshness, but it reflects the principle that parties should be held to their bargains. Modern employment law has moved far from Cutter, but the entire obligation rule survives in construction and service contracts.

Hochster v De la Tour introduced the doctrine of anticipatory breach. The courier could sue immediately on the employer's renunciation in May, without waiting until 1 June. The decision promoted commercial efficiency by allowing the innocent party to mitigate loss and re-enter the market promptly. It also confirmed that a contract could be breached before performance was due. The case provoked academic debate: how could a contract be breached before the obligation arose? The answer lies in the reciprocal nature of contractual obligations and the concept of renunciation as a distinct wrong.

Hoenig v Isaacs and Bolton v Mahadeva define the boundaries of substantial performance. The former permitted recovery for work nearly complete with minor defects; the latter denied it where defects were significant. The cases turn on matters of degree, making them difficult to apply predictably. They illustrate the tension between holding contractors to their obligations and preventing unjust enrichment of the employer who retains the benefit.

Hong Kong Fir Shipping established the innominate (intermediate) term, under which the remedy depends on the consequences of breach rather than the label attached to the term. The shipowner's breach of the seaworthiness obligation delayed the vessel and reduced its earning capacity, but the delay was not so severe as to deprive the charterer of substantially the whole benefit of the five-year charter. Diplock LJ's judgment is a landmark of functionalist reasoning, preferring substance over form. It has been criticised for reducing certainty, but it remains orthodox.

White & Carter (Councils) Ltd v McGregor is the most controversial case in this area. The House of Lords held (by a bare 3–2 majority) that an advertising contractor who affirmed a repudiated contract could continue to display advertisements and claim the full price, despite the customer's repudiation. Lord Reid's limitation—that the claimant must have a legitimate interest in performing rather than claiming damages, and must not require the defendant's cooperation—has been invoked in later cases to confine White & Carter. The decision challenges the normal rule that the innocent party's duty is to mitigate. It has been distinguished more often than followed.

The Mihalis Angelos [1971] 1 QB 164 concerned a charterparty requiring the vessel to be 'expected ready to load' by 1 July. The charterers repudiated on 17 July. The owners accepted the repudiation. It emerged that the vessel could not in fact have been ready by 1 July, so the owners would themselves have been in breach. The Court of Appeal held that the charterers' repudiation discharged the contract immediately, and the owners' prospective breach was irrelevant. The case clarifies that acceptance of an anticipatory breach crystallises discharge at that moment, regardless of hypothetical future events.

Charles Rickards Ltd v Oppenheim demonstrates how time can be made of the essence by notice. The contract for a Rolls-Royce body did not make time of the essence. After repeated delays, the buyer gave notice requiring delivery in four weeks. The seller failed to deliver. The Court of Appeal held that the buyer was entitled to terminate. The case illustrates the balance between initial flexibility and the innocent party's ultimate entitlement to finality.

Sumpter v Hedges shows that no restitutionary recovery is available where the innocent party has no real choice about accepting the benefit. A builder who abandoned a half-built structure on the defendant's land could not recover on a quantum meruit for the value of the work; the landowner had no option but to accept it. The case confines substantial performance and unjust enrichment doctrines by requiring the innocent party's genuine acceptance of partial performance.

See practice questions below.

See further reading below.