Capacity to contract is one of the core requirements for a valid contract, alongside offer, acceptance, consideration, and lawful object. A party lacking capacity may render an agreement void or voidable, depending on the jurisdiction and the nature of the incapacity.
The doctrine generally addresses three categories of persons:
- Minors: In most common-law systems, contracts entered by minors are voidable at the minor's option, with exceptions for necessaries (food, shelter, basic education). The age of majority is typically 18 in the United States, United Kingdom, and India, though it varies.
- Persons of unsound mind: Individuals who cannot understand the nature and consequences of the agreement at the time of contracting lack capacity. This includes those with cognitive impairments, intoxication, or temporary mental incapacity.
- Persons disqualified by law: Certain statuses—such as undischarged bankrupts, convicts during imprisonment, or foreign sovereigns under sovereign immunity doctrines—may be disqualified from some contracts.
In Indian law, capacity is codified in Sections 11 and 12 of the Indian Contract Act, 1872. Under English common law, the leading historical authority on minors' contracts is Nash v. Inman [1908] 2 KB 1, which clarified the "necessaries" exception. In the United States, the Restatement (Second) of Contracts §§ 12–16 addresses capacity, and the Uniform Commercial Code preserves minors' protections in sales contexts.
Corporate capacity is governed by separate doctrines. The historical ultra vires rule limited companies to acts within their stated objects, though modern statutes—such as the UK Companies Act 2006, s.39—have largely abolished its effect against third parties. States similarly have "capacity" under international law to conclude treaties, codified in Article 6 of the Vienna Convention on the Law of Treaties (1969), though this is conceptually distinct from private contract capacity.
For MUN and IR researchers, distinguishing private-law capacity from treaty-making capacity under public international law is essential when drafting resolutions touching on commercial or investment matters.
Example
In Mohori Bibee v. Dharmodas Ghose (1903), the Privy Council held that a mortgage executed by a minor in India was void ab initio under the Indian Contract Act, 1872, because minors lack capacity to contract.
Frequently asked questions
It is typically voidable at the option of the incapacitated party, meaning they can affirm or rescind it. In some jurisdictions, such as India for minors, it is void ab initio (entirely without legal effect).
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