Impossibility

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Contract Law
Part of the common law series
Contract
Contract formation
Offer and acceptance  · Mailbox rule
Mirror image rule  · Invitation to treat
Firm offer  · Consideration
Defenses against formation
Lack of capacity to contract
Duress  · Undue influence
Illusory promise  · Statute of frauds
Non est factum
Contract interpretation
Parol evidence rule
Contract of adhesion
Integration clause
Contra proferentem
Excuses for non-performance
Mistake  · Misrepresentation
Frustration of purpose  · Impossibility
Impracticability  · Illegality
Unclean hands  · Unconscionability
Accord and satisfaction
Rights of third parties
Privity of contract
Assignment  · Delegation
Novation  · Third party beneficiary
Breach of contract
Anticipatory repudiation  · Cover
Exclusion clause  · Efficient breach
Fundamental breach
Remedies
Specific performance
Liquidated damages
Penal damages  · Rescission
Quasi-contractual obligations
Promissory estoppel
Quantum meruit
Subsets: Conflict of law
Commercial law
Other areas of the common law
Tort law  · Property law
Wills and trusts
Criminal law  · Evidence

In contract law, impossibility is an excuse for the nonperformance of duties under a contract, based on a change in circumstances (or the discovery of preexisting circumstances), the nonoccurrence of which was an underlying assumption of the contract, that makes performance of the contract literally impossible. For such a defense to be raised, performance must not merely be difficult or unexpectedly costly for one party; there must be no way for it to actually be accomplished.

For example, if Rachel contracts to pay Joey $1000 to paint her house on October 1, but the house burns to the ground before the end of September, Rachel is excused from her duty to pay Joey the $1000, and he is excused from his duty to paint her house; however, Joey may still be able to sue for the unjust enrichment of any benefit conferred on Rachel before her house burned down.

The English case that established this doctrine at common law is Taylor v. Caldwell.

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