Glossary of Canadian Contract Law Terms

Offer

An offer is a clear, unequivocal statement of willingness to enter into a contract on specified terms, made with the intention that it will become binding upon acceptance without further negotiation. Canadian courts assess the existence of an offer objectively, asking whether a reasonable person in the position of the offeree would believe that the offeror intended to be bound upon acceptance (Carlill v Carbolic Smoke Ball Co, [1893] 1 QB 256 (CA)). An offer is distinguished from an invitation to treat — a mere expression of willingness to negotiate or receive offers, such as advertisements, goods displayed on shelves, or calls for tenders. An offer may be revoked at any time before acceptance, unless supported by an option (a separate contract to keep the offer open). It lapses upon the expiry of any stated time, upon the death or insanity of either party, or by operation of a counter-offer.

Acceptance

Acceptance is the unconditional assent to all the terms of an offer, communicated to the offeror. The acceptance must correspond exactly to the terms of the offer; any variation constitutes a counter-offer that destroys the original offer (Hyde v Wrench (1840), 49 ER 132). Acceptance may be express or implied from conduct. The postal acceptance rule — under which acceptance occurs when and where the letter is posted — applies where the parties reasonably contemplated that the post would be used as a means of communication. The rule has been circumscribed in Canadian jurisprudence, particularly for instantaneous modes of communication, where acceptance takes effect upon receipt (Brinkibon Ltd v Stahag Stahl und Stahlwarenhandelsgesellschaft mbH, [1983] 2 AC 34 (HL)). The offeror may prescribe the mode of acceptance, and where a particular method is required, acceptance in any other manner is ineffective.

Consideration

Consideration is the price paid for a promise — something of legal value given in exchange for the promise sought to be enforced. Canadian law requires that each party provide consideration, though it need not be adequate (the courts do not inquire into the sufficiency of the exchange). The doctrine distinguishes between a promise and a gift: only bargained-for exchanges are enforceable. Past consideration — an act or forbearance that predates the promise — is not good consideration. However, Canadian courts have developed exceptions, including the doctrine of promissory estoppel, which may enforce a promise unsupported by consideration where the promisor intended the promise to be relied upon and the promisee has in fact relied on it to their detriment (High Trees principle, applied in Canada in John Burrows Ltd v Subsurface Surveys Ltd, [1968] SCR 607). The Supreme Court of Canada has recently reiterated the continued vitality of consideration in Bhasin v Hrynew, 2014 SCC 71, while acknowledging the need for flexibility through the organising principle of good faith.

Intention to Create Legal Relations

A contract does not exist unless the parties intended to create a legally binding relationship. Canadian courts apply an objective test to determine whether a reasonable person would have understood the parties to intend legal consequences. In commercial agreements, the presumption is that the parties intend to be legally bound; this presumption is rebuttable only by clear evidence to the contrary (e.g., an honour clause or letter of comfort). In social, domestic, or family arrangements, the presumption is reversed: the parties are presumed not to intend legal relations, absent clear evidence to the contrary (Balfour v Balfour, [1919] 2 KB 571 (CA); Spouses v Spouse (Blackwell v Blackwell, 1943). The presumptions serve as interpretive starting points and may be displaced by the circumstances of the case, including the degree of formality, the presence of legal advice, and the magnitude of the transaction.

Certainty of Terms

A contract is enforceable only if its essential terms are sufficiently certain and complete. Canadian law requires that the material terms — typically the parties, the subject matter, and the price — be identified with sufficient precision that a court can determine the obligations of each party. An agreement to agree — a promise to negotiate future terms — is void for uncertainty unless the parties have agreed on a mechanism for resolving the outstanding terms (such as arbitration or valuation by a third party). Vague or illusory terms may be severed if they are not essential, or cured by implying reasonable terms through the doctrine of certainty of terms. Courts are reluctant to strike down agreements that the parties have acted upon, and may strive to give business efficacy to arrangements that demonstrate a clear intention to contract (Hillas & Co Ltd v Arcos Ltd (1932), 147 LT 503 (HL)).

Privity of Contract

The privity of contract doctrine holds that only a person who is a party to a contract may enforce its terms or be subjected to its obligations. A third-party beneficiary — one who is not a party to the contract — cannot sue on a promise made for their benefit, even if the contract was expressly intended to confer a benefit upon them. The rule has been subject to significant criticism and statutory reform. In Canada, several provinces have enacted legislation permitting third-party beneficiaries to enforce contracts made for their benefit (e.g., Law and Equity Act, RSBC 1996, c 253, s 7; Insurance Act, RSO 1990, c I.8). The common law exceptions include trusts of a contractual promise, agency (where the agent contracts on behalf of a disclosed or undisclosed principal), and assignment of contractual rights. The Supreme Court of Canada affirmed the basic rule in London Drugs Ltd v Kuehne & Nagel International Ltd, [1992] 3 SCR 299, while recognising an exception for employees seeking to enforce limitation of liability clauses included for their benefit.

Misrepresentation

Misrepresentation is a false statement of fact made by one party to the other before or at the time of contracting that induces the contract. Canadian law distinguishes three categories: innocent misrepresentation, negligent misrepresentation, and fraudulent misrepresentation. An innocent misrepresentation is a false statement made without fault; the remedy is rescission but not damages unless the statement becomes a term of the contract. A negligent misrepresentation is a false statement made without reasonable care for its truth, giving rise to damages in tort under the principle of Hedley Byrne & Co Ltd v Heller & Partners Ltd, [1964] AC 465 (HL), as adopted by the Supreme Court in Queen v Cognos Inc, [1993] 1 SCR 87. Fraudulent misrepresentation (the tort of deceit) requires proof that the defendant knowingly or recklessly made a false statement intending that the plaintiff act upon it. The remedy for fraud includes rescission and damages in tort for all loss directly flowing from the fraud, measured by the tortious rather than contractual measure.

Duress

Duress is a vitiating factor that renders a contract voidable at the option of the coerced party. The traditional categories are duress to the person (threats of violence or imprisonment), duress of goods (wrongful seizure or detention of property), and economic duress (wrongful or illegitimate pressure amounting to coercion of the will). Canadian courts have adopted a broader, more flexible approach to economic duress, examining whether the pressure applied was illegitimate and whether it left the plaintiff with no practical alternative but to submit (Gordon v Roebuck (1992), 9 OR (3d) 1 (CA)). Mere commercial pressure or hard bargaining does not constitute duress; the pressure must be such that it overbears the independent will of the plaintiff. Where duress is established, the contract is voidable and the coerced party may seek rescission, subject to the availability of restitution and the absence of affirmation.

Undue Influence

Undue influence is equitable doctrine that allows a court to set aside a contract where one party has exercised such influence over the other that the transaction cannot be regarded as the product of the weaker party’s free and independent will. Canadian law recognises two classes: actual undue influence (where the plaintiff proves that the defendant actively exerted influence) and presumed undue influence (where the relationship between the parties — such as solicitor-client, doctor-patient, parent-child, or guardian-ward — gives rise to a rebuttable presumption that the dominant party exercised influence). Once a relationship of influence is established, the burden shifts to the dominant party to show that the weaker party entered the transaction freely, with full understanding, and with independent legal advice (Geffen v Goodman Estate, [1991] 3 SCR 483). The concept is closely related to unconscionability but distinct: undue influence focuses on the quality of consent, while unconscionability focuses on the fairness of the bargain.

Unconscionability

Unconscionability is an equitable doctrine permitting a court to refuse to enforce or to set aside a transaction that is so one-sided as to be oppressive. The test in Canada requires the plaintiff to prove two elements: (1) a gross imbalance in the bargaining power of the parties, such that the weaker party was unable to adequately protect their own interests; and (2) a substantially unfair bargain that shocks the conscience of the court (Morrison v Coast Finance Ltd (1965), 55 DLR (2d) 710 (BCCA)). Unlike undue influence, unconscionability does not require proof of a specific relationship of influence; it looks instead to the process of bargaining and the substantive fairness of the outcome. The doctrine applies in both consumer and commercial contexts, though courts are less likely to intervene in transactions between sophisticated commercial parties. Independent legal advice may rebut a finding of unconscionability by showing that the weaker party understood and freely accepted the terms.

Frustration

Frustration discharges a contract where, after its formation, a supervening event renders performance impossible, illegal, or radically different from what the parties contemplated. The event must not be the fault of either party, and it must be of such significance that the foundation of the contract has been destroyed (Krell v Henry, [1903] 2 KB 740 (CA); R v Paulson, [1921] 1 AC 271 (PC)). If the event was foreseeable and the contract contains no provision for it, the contract is not frustrated; the parties are deemed to have allocated the risk by their silence. Where frustration is established, the contract is automatically terminated, and the parties are discharged from future performance. The Frustrated Contracts Act (RSO 1990, c F.34) and equivalent provincial legislation provide for adjustment of rights and restitution of benefits conferred before the frustrating event, modifying the common law rule that losses lie where they fall.

Breach of Contract

Breach of contract occurs when a party fails to perform an obligation under the contract without lawful excuse. Canadian law distinguishes between actual breach (failure to perform when performance is due) and anticipatory breach (repudiation before the time for performance, where the party indicates an intention not to perform). The innocent party may elect to treat the contract as repudiated and sue immediately, or to await the time for performance. A fundamental breach — breach going to the root of the contract — entitles the innocent party to terminate the contract and claim damages for total loss, whereas a non-fundamental (minor) breach sounds only in damages. The Supreme Court of Canada in Tercon Contractors Ltd v British Columbia (Transportation and Highways), 2010 SCC 4, reframed the analysis: the court first interprets the exclusion clause, then considers whether the breach falls within the scope of the clause as interpreted, and finally asks whether enforcing the clause would be unconscionable.

Damages

Damages are the primary common law remedy for breach of contract. The overarching goal is to place the innocent party in the position they would have been in had the contract been performed, not to punish the wrongdoer. Canadian law recognises several measures: expectation damages (the benefit of the bargain, covering lost profits); reliance damages (expenditures made in reliance on the contract, where expectation damages are too speculative); and restitutionary damages (restoring a benefit conferred on the defendant). Liquidated damages are fixed by the parties in advance; they are enforceable provided they represent a genuine pre-estimate of loss and are not a penalty — a sum that is extravagant and unconscionable in comparison with the greatest possible loss (H.F. Clarke Ltd v Thermidaire Corp Ltd, [1976] 1 SCR 319). Punitive damages are available in contract but are exceptional, requiring an independent actionable wrong and conduct that represents a marked departure from ordinary standards of decency (Whiten v Pilot Insurance Co, 2002 SCC 18). The injured party has a duty to mitigate their losses by taking reasonable steps to reduce the damage flowing from the breach.

Specific Performance

Specific performance is an equitable remedy compelling the defendant to perform their contractual obligations as promised. It is available only where damages are inadequate to compensate the plaintiff — typically in contracts for the sale of unique property (such as land), for the transfer of rare chattels (e.g., works of art), or where the subject matter is of peculiar value to the plaintiff. The remedy is discretionary and will be refused if it would require constant supervision by the court, if performance is impossible, if the plaintiff has not come with clean hands, if there has been delay (laches), or if enforcement would cause disproportionate hardship. The court may grant specific performance with abatement for defects. In contracts for personal services, specific performance is generally refused because it would effectively impose involuntary servitude.

Injunction

An injunction is an equitable order requiring a party to do (mandatory injunction) or refrain from doing (prohibitory injunction) a specified act. In the contractual context, a prohibitory injunction is commonly sought to enforce a negative covenant — a promise not to do something, such as a non-competition or non-solicitation clause. The test for an interlocutory injunction is set out in RJR-MacDonald Inc v Canada (Attorney General), [1994] 1 SCR 311: the plaintiff must show a serious question to be tried, that irreparable harm would result if the injunction were not granted, and that the balance of convenience favours granting the relief. A mandatory injunction (requiring positive acts) is subjected to a more stringent standard, with the plaintiff required to show a strong prima facie case. Breach of an injunction constitutes contempt of court, punishable by fine or imprisonment.

Quantum Meruit

Quantum meruit (as much as he has earned) is a restitutionary claim for the reasonable value of services rendered or goods provided in circumstances where no contract governs the parties’ obligations. In Canadian law, quantum meruit arises in two principal contexts: (1) where the parties have a contract but the contract does not cover the services rendered (an implied term or implied contract); and (2) where there is no contract at all, and the claim is based on unjust enrichment. A plaintiff must establish that they provided a benefit to the defendant, that the defendant received the benefit, and that it would be unjust for the defendant to retain the benefit without payment. Where the parties have negotiated but failed to reach a final agreement, quantum meruit may be available for pre-contractual services if it would be inequitable to deny recovery (Deglman v Guaranty Trust Co of Canada, [1954] SCR 725).

Force Majeure

A force majeure clause excuses a party from performing its contractual obligations upon the occurrence of specified extraordinary events beyond the party’s control. Unlike the common law doctrine of frustration — which operates by operation of law — a force majeure clause is a creature of contract and is interpreted according to its terms. Canadian courts construe force majeure clauses strictly, requiring the party seeking to rely on the clause to prove that the event falls within the scope of the defined events and that it caused the non-performance. Standard force majeure events include acts of God, war, pandemics, government orders, strikes, and fire. An event that was foreseeable or could have been mitigated will not ordinarily excuse performance. The clause typically imposes an obligation on the affected party to give notice and to take reasonable steps to mitigate the impact. Where a force majeure event continues for an extended period, the contract may be terminated.

Entire Agreement Clause

An entire agreement clause (or merger clause) states that the written contract constitutes the whole agreement between the parties and supersedes all prior negotiations, representations, and agreements, whether oral or written. In Canadian law, such clauses are generally enforceable and serve to promote certainty and finality by preventing parties from introducing extrinsic evidence to vary or supplement the written terms. However, an entire agreement clause does not prevent a claim in misrepresentation (including negligent misrepresentation) unless the clause explicitly and clearly excludes liability for pre-contractual representations (Zaccardo v Luciani, 2014 ONCA 555). The clause will not protect a party where it would be unconscionable to do so, or where the contract is subject to statutory consumer protection provisions that override such clauses. Canadian courts interpret entire agreement clauses contextually, recognising that they are a shield against parole evidence but not a bar to claims of fraud, fundamental breach, or collateral contracts that are proven to exist independently.