What Makes a Contract Legally Binding in Canada?

What makes a contract enforceable in Canada

A contract is an agreement a court will enforce. In Canada, whether a given agreement is enforceable depends mostly on provincial law: Ontario and Alberta each have their own statutes and common law (rules built up through court decisions) governing who can contract, what must be in writing, and how a contract can be formed. There is no single federal statute that defines when a contract is binding across the country. This matters for a business owner because a rule that applies in Ontario does not automatically apply in Alberta, and assuming otherwise can leave an agreement unenforceable when it matters most.

Contract law is provincial, not federal

Under the Constitution Act, 1867, the power to legislate on “Property and Civil Rights in the Province” belongs to the provinces (s 92(13)). This is the constitutional basis for provincial contract law: Ontario and Alberta each set their own rules, and the two provinces are not required to match. Parliament’s authority touching contracts is limited to specific enumerated subjects, such as bills of exchange and promissory notes, and bankruptcy and insolvency (s 91(18) and (21)), rather than a general power over how contracts are formed or enforced. In practice, this means a business operating in both provinces needs to check the rule in each province separately rather than assuming a national standard.

Who can legally enter into a contract

Both provinces set the age of majority (the age at which a person gains full legal capacity to contract) at 18. Ontario’s Age of Majority and Accountability Act provides that a person attains the age of majority and ceases to be a minor at 18 years old. Alberta’s Age of Majority Act sets the same threshold. In Ontario, a contract made by someone under 18 is generally voidable at the minor’s option under common law, meaning the minor can choose to cancel the agreement, while the other party normally cannot.

When a contract must be in writing

Most contracts in Ontario do not need to be in writing to be enforceable, but a small number of categories are the exception. Under Ontario’s Statute of Frauds, a contract is unenforceable unless there is a signed written memorandum (a note or summary confirming the deal) for certain categories, including a promise to answer for another person’s debt (a guarantee) and any contract for the sale of land. Without that signed writing, a court will not enforce these specific categories of agreement, even where both sides agree a deal was made.

For Alberta, no current equivalent statute could be confirmed for this article. Anyone relying on a verbal or informal guarantee or land-sale agreement in Alberta should check the current Alberta rule directly rather than assume it mirrors Ontario’s.

Contracts formed electronically are valid

Both provinces treat electronically formed contracts as valid, including contracts formed with little or no direct human involvement at the moment of formation. Under Ontario’s Electronic Commerce Act, 2000, a contract can be formed through the interaction of an electronic agent (software, such as an automated ordering system) and a person, or through the interaction of two electronic agents. Alberta’s Electronic Transactions Act sets out the same rule for electronic agents, and separately confirms that an offer, an acceptance, or any other matter material to forming a contract can be validly expressed electronically, such as by clicking an icon, unless the parties have agreed otherwise. For a business selling online or automating parts of its contracting process in either province, this means the absence of a handwritten signature or a live conversation does not by itself defeat enforceability.

Where this leaves a business owner

Putting the pieces together: an agreement in Ontario or Alberta needs a party old enough to have capacity (18 or older, or ratified after turning 18), does not fall into one of the narrow Ontario categories requiring signed writing unless that writing exists, and can be formed through ordinary means, including electronic ones, in both provinces. Because the underlying rules sit in provincial statutes and common law rather than a single federal source, the safest approach for any agreement that matters, a guarantee, a land deal, or a high-value electronic transaction, is to confirm the current rule in the specific province where the contract is being made.