A breach of contract occurs when a party to a legally enforceable agreement fails to fulfill its promised obligations—whether by non-performance, defective performance, or repudiation—without a recognized justification such as frustration, force majeure, or the other side's prior material breach.
Legal systems typically distinguish several categories:
- Material (or fundamental) breach — a failure going to the root of the contract, allowing the innocent party to terminate and claim damages. In English law this concept tracks the Hong Kong Fir Shipping v Kawasaki Kisen Kaisha (1962) innominate-term analysis.
- Minor (or partial) breach — performance is defective but the contract's main purpose is achieved; the remedy is damages only, not termination.
- Anticipatory breach — one party signals before performance is due that it will not perform, as recognized in Hochster v De La Tour (1853).
- Actual breach — non-performance at or after the due date.
Standard remedies include expectation damages (putting the claimant in the position as if the contract had been performed), reliance damages, restitution, specific performance, and injunctions. Common-law jurisdictions cap recovery through doctrines of remoteness (Hadley v Baxendale, 1854) and mitigation.
In international and commercial practice, the UN Convention on Contracts for the International Sale of Goods (CISG, 1980) uses the concept of "fundamental breach" in Article 25 as the threshold for avoiding the contract. The UNIDROIT Principles of International Commercial Contracts offer parallel rules widely used in arbitration.
For IR and policy researchers, breach-of-contract analysis matters in investor–state disputes (where breach of a state contract may also implicate treaty protections under bilateral investment treaties), sovereign debt restructurings, and public procurement litigation. It is conceptually distinct from breach of a treaty, which is governed by the law of state responsibility and the Vienna Convention on the Law of Treaties (1969), though the two regimes can overlap when states contract with private parties.
Example
In 2012, Argentina was found by ICSID tribunals to have breached contractual and treaty obligations to foreign utility investors following its 2001–2002 emergency measures freezing tariffs denominated in US dollars.
Frequently asked questions
A material breach defeats the core purpose of the contract and allows the innocent party to terminate and sue for damages; a minor breach permits only a damages claim while the contract remains on foot.
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