Discharge by performance and breach

Discharge by performance and breach concerns the final stage of the contractual life-cycle. Weeks 1 to 3 explained how a binding agreement is formed; Weeks 4 and 5 considered its terms and attempts to limit liability; Weeks 6 to 9 examined doctrines by which a contract may be avoided or denied effect; Week 10 considered who may enforce it. Week 11 asks a different question: assuming a valid contract between the parties, when are their primary obligations brought to an end, and what follows if one party fails to perform?

The governing distinction is between discharge by performance and discharge for breach. Performance is the normal method of discharge: each party does what was promised, and the primary obligations are exhausted. Breach is abnormal. It does not automatically dissolve the contract. A breach gives rise at least to secondary liability in damages. Only some breaches also entitle the innocent party to terminate, that is, to elect to treat future primary obligations as discharged while preserving accrued rights and the right to damages. The vocabulary is important. English law still often speaks of repudiation, rescission for breach, treating the contract as discharged, or accepting a repudiatory breach. In a modern exam answer, the safest terminology is termination for repudiatory breach, not rescission, because rescission more properly belongs to vitiating factors such as misrepresentation, mistake, duress and undue influence.

The central analytical structure is fourfold. First, identify the obligation allegedly performed or breached. Secondly, decide whether performance was exact, substantial, or defective. Thirdly, classify the relevant term or breach: condition, warranty, innominate term, renunciation, self-induced impossibility, or fundamental non-performance. Fourthly, state the consequences: contract discharged by full performance; price payable despite minor defects; damages only; or termination plus damages following election by the innocent party.

For Durham first-year purposes, this topic is especially examinable because it draws together the earlier architecture of the module. Classification of terms depends upon Week 4. Exclusion clauses may affect the consequences of defective performance but cannot themselves decide whether a breach occurred. Misrepresentation, duress, mistake and illegality may explain why a contract is not enforceable at all; discharge by performance and breach assumes enforceability and asks how the contractual obligations come to an end. Privity determines who can sue; discharge determines what they can sue for and whether they must continue performing.

The chief cases also reveal a tension in English contract law. On the one hand, the law appears strict: the promisee is entitled to the stipulated performance and, in principle, need not accept something else. On the other hand, the courts resist commercially wasteful forfeiture where performance is substantially rendered, the defect is compensable, or the term is not properly classified as a condition. The subject is therefore a controlled compromise between certainty and fairness. A good Durham answer will not merely list cases; it will show how the law distinguishes the obligation to perform exactly from the remedial question whether a defect is serious enough to justify termination.

The older common law conceived contractual obligations in relatively rigid terms. A party who promised to do a specified act was required to do that act, and a party who sought payment had ordinarily to show complete performance of the promised consideration. This was partly a consequence of procedural history. Debt lay to recover a fixed sum due; assumpsit developed to enforce undertakings and compensate non-performance. The common law was therefore predisposed to ask whether the agreed exchange had occurred. If the contract was entire, a party who had not completed performance could not recover the contract price.

Cutter v Powell remains the classic illustration of that strictness. A sailor was promised a lump sum if he served for a voyage; he died before completion. His estate recovered nothing on the express contract. The decision is usually explained by the nature of an entire obligation: the promised payment was conditional upon complete performance. The case is harsh, but the principle is not irrational. Parties may allocate risk by making payment conditional on completion. The difficulty lies in determining when they have done so and whether a court should infer such a severe allocation from ambiguous words.

Nineteenth-century law also recognised exceptions and qualifications. Where the employer voluntarily accepted partial performance, or where the contract was severable, restitutionary or contractual recovery might be possible. Where the promisee prevented completion, the promisor was not necessarily left remediless. Boone v Eyre, often associated with Lord Mansfield, represents a more liberal strand: not every defective performance by one party entitled the other to refuse all performance. The question became whether the particular promise went to the whole consideration or whether damages were an adequate response.

The twentieth century refined these distinctions. The doctrine of substantial performance softened the complete-performance rule in building and service contracts. In Hoenig v Isaacs, a decorator who had substantially completed work could recover the contract price less the cost of remedying defects. By contrast, in Bolton v Mahadeva, defective central heating was not substantial performance, so the contractor could not sue for the price. These cases do not abolish exact performance. Rather, they ask whether the promisor has done enough to trigger the counter-performance, leaving defects to damages.

A separate development concerned breach as a ground of discharge. Early law classified terms as conditions or warranties. Breach of a condition entitled termination; breach of a warranty gave damages only. This binary scheme had the virtue of certainty but often produced crude results. A trivial breach of a condition might allow rejection of a valuable commercial contract, while a serious breach of a warranty might not. Commercial law partly retained strict conditions, especially for time stipulations in mercantile contracts. But general contract law developed the innominate term through Hongkong Fir Shipping Co Ltd v Kawasaki Kisen Kaisha Ltd. Some terms cannot sensibly be classified in advance as always conditions or always warranties. The court instead asks whether the breach deprives the innocent party of substantially the whole benefit intended under the contract.

Anticipatory breach is another historical refinement. Hochster v De la Tour permitted the innocent party to sue before the time for performance where the other party had renounced. That doctrine treats a clear refusal to perform as legally significant before actual non-performance. It reflects the commercial need not to wait idly for inevitable default. Yet it also introduces the requirement of election. The innocent party may accept the repudiation and terminate, or affirm the contract and keep it alive, subject to important limits where performance requires cooperation or where there is no legitimate interest in continuing.

The modern law is thus not a single rule but a set of distinctions: entire and severable obligations; exact and substantial performance; conditions, warranties and innominate terms; actual and anticipatory breach; termination and damages. Its historical movement is from formal completeness towards calibrated remedies, without abandoning the fundamental idea that contract law enforces the performance promised, not merely a judicially reasonable substitute.

1. Performance is the primary method of discharge. A contract is discharged by performance when each party has carried out the obligations that the contract required of that party. The starting point is exact performance: the promisor must do what was promised, not something broadly similar. This principle protects the promisee's expectation and respects the parties' allocation of risk. It also explains why the court must first construe the contract. One cannot decide whether performance is complete until one knows what performance was due.

1. Entire obligations require complete performance before the counter-performance becomes due. An entire obligation is one in which the contract, on its true construction, makes the right to payment or other counter-performance conditional upon full completion. Cutter v Powell is the paradigm. But courts are slow to infer an entire obligation where that would cause forfeiture disproportionate to the commercial setting. The labels used by the parties are relevant but not conclusive. Factors include the form of the price, the divisibility of the work, the parties' expectations, and whether the promisee has received and retained a benefit.

1. Severable obligations permit payment or performance by instalments. Where a contract is divisible, completion of each part may trigger the corresponding part of the price. Employment paid weekly, goods delivered in instalments, or staged construction payments may be severable. Severability is not merely an arithmetical question. It depends upon construction. A single lump sum suggests entirety; separate rates or milestones suggest divisibility. In a problem question, never assume that failure to complete the whole contract bars all recovery. Ask whether the contract divides the obligations.

1. Substantial performance may entitle a party to the price, subject to a deduction for defects. The doctrine applies where performance is not exact but is sufficiently close to the promised performance that the promisor should not be treated as having failed to perform altogether. Hoenig v Isaacs is the leading illustration. The contractor recovered the contract price less the cost of remedying defective work. Bolton v Mahadeva marks the boundary: defective heating that failed to provide the intended benefit was not substantial performance. The question is one of degree, but degree is measured against the contractual purpose, not mere percentage completion.

The cases in this topic form a coherent sequence. Cutter v Powell stands at the strict end of the spectrum. The contract was treated as entire: payment depended on completion of the voyage. It remains authority for the proposition that a party who has promised complete performance as a condition of payment may recover nothing on the contract if that condition is not satisfied. The modern significance of Cutter is not that courts welcome forfeiture, but that construction can allocate the risk of non-completion severely.

Sumpter v Hedges shows the limits of recovery for partial performance. The claimant abandoned building work after doing part of it. The defendant completed the work using materials left on site. The claimant could not recover for the work because the defendant had not freely accepted partial performance; there was no practical option to reject incomplete structures on his land. The case is valuable because it prevents students from assuming that any retained benefit gives an automatic right to payment.

Hoenig v Isaacs and Bolton v Mahadeva provide the central contrast on substantial performance. In Hoenig, defective decoration did not prevent recovery of the price, subject to deduction for defects. The essential contractual benefit had been received. In Bolton, a central heating system was so defective that the contractor had not substantially performed. The distinction is not simply the amount of the defect. It concerns whether the performance, viewed against the contract's purpose, is substantially what was promised.

Hongkong Fir Shipping Co Ltd v Kawasaki Kisen Kaisha Ltd is the doctrinal centre of breach. The shipowner's obligation to provide a seaworthy vessel was breached, causing delay. The Court of Appeal held that the term was not automatically a condition; the consequences of the breach had to be assessed. Because the charterers were not deprived of substantially the whole benefit of the charter, they could not terminate. The case introduced the modern innominate term and made seriousness of consequences central where a term is not classified in advance.

The Mihalis Angelos shows the countervailing need for certainty. A readiness-to-load clause in a charterparty was treated as a condition. Commercial parties require clear rules for time-sensitive obligations. Likewise, Bunge Corp v Tradax Export SA confirms that in mercantile contracts time stipulations may be conditions even where the immediate consequences of breach appear limited. The law therefore does not move wholly from classification to consequences. It uses both methods.

Hochster v De la Tour supplies the doctrine of anticipatory breach. A party who unequivocally renounces before performance is due commits a repudiatory breach that the innocent party may accept immediately. This enables mitigation and commercial planning. It also introduces the election problem: the innocent party may terminate at once or affirm and hold the contract open.

Photo Production Ltd v Securicor Transport Ltd is best known for exclusion clauses, but it is also important for breach. The House of Lords rejected the old idea that fundamental breach operates as an automatic rule of law invalidating exclusion clauses. Breach, however serious, does not dissolve the contract by magic. The consequences depend upon construction, termination, and the ordinary law of damages. This reinforces the modern view that termination is an election and that exclusion clauses are construed rather than defeated by a free-standing doctrine of fundamental breach.

See practice questions section below.

See further reading section below.