Impossibility of performance¶
The doctrine or principle of impossibility, impossibility of performance or impossibility of performance of contract is a doctrine in contract law, and in this context, the "impossibility defense" is a defense offered against a claim for nonperformance.
Core Idea¶
Impossibility of performance is treated here as the recurring socialscienceshumanitiesarts identity summarized by this source-grounded definition: The doctrine or principle of impossibility, impossibility of performance or impossibility of performance of contract is a doctrine in contract law, and in this context, the "impossibility defense" is a defense offered against a claim for nonperformance. The doctrine or principle of impossibility, impossibility of performance or impossibility of performance of contract is a doctrine in contract law, and in this context, the "impossibility defense" is a defense offered against a claim for nonperformance.
Scope of Application¶
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Documented setting. For example, if Ebenezer contracts to pay Erasmus £100 to paint his house on October 1, but the house burns to the ground before the end of September, Ebenezer is excused.
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Australia. As to whether the non-existence of the subject matter of a contract constitutes (initial) impossibility of performance, see McRae v Commonwealth Disposals Commission.
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England and Wales. In 1997, Downes said that impossibility and impracticability were separate in England and Wales, and that impracticability was not usually found to result in frustration.
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England and Wales. The English case that established the doctrine of impossibility at common law is Taylor v Caldwell.
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New Zealand. Wilkins and Davies Construction Co Ltd v Geraldine Corporation NZLR 985 is relevant.
Clarity¶
A clear use of Impossibility of performance names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is The doctrine or principle of impossibility, impossibility of performance or impossibility of performance of contract is a doctrine in contract law, and in this context, the "impossibility defense" is a defense offered against a claim for nonperformance.
Manages Complexity¶
Impossibility of performance compresses multiple socialscienceshumanitiesarts details into a stable diagnostic relation. The source shows both the central mechanism—a contract may be ended by supervening impossibility of performance.—and the practical consequence—the English case that established the doctrine of impossibility at common law is Taylor v Caldwell. This compression makes cases comparable while leaving parameters, conventions, exceptions, and evidential quality explicit.
Abstract Reasoning¶
- Type the carrier. Identify the socialscienceshumanitiesarts entities to which the claim applies.
- State the relation. Use the source-grounded identity: The doctrine or principle of impossibility, impossibility of performance or impossibility of performance of contract is a doctrine in contract law, and in this context, the "impossibility defense" is a defense offered against a claim for nonperformance.
- Check operation and conditions.
Knowledge Transfer¶
Within the home domain. Knowledge about Impossibility of performance transfers literally when a new case preserves the same carrier type, relation, and recognition test. For example, if Ebenezer contracts to pay Erasmus £100 to paint his house on October 1, but the house burns to the ground before the end of September, Ebenezer is excused from his duty to pay Erasmus the £100, and Erasmus is excused from his duty to paint Ebenezer's house; however, Erasmus may still be able to sue under the theory of unjust enrichment for the value of any benefit he conferred on Ebenezer before his.
Relationships to Other Abstractions¶
Current abstraction Impossibility of performance Domain-specific
Parents (1) — more general patterns this builds on
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Impossibility of performance is a kind of Legal Doctrine Domain-specific
Impossibility of performance is a contract-law doctrine defining when supervening impossibility can excuse performance.
Hierarchy path (1) — routes to 1 parentless root
- Impossibility of performance → Legal Doctrine → Doctrine → Schema → Abstraction
Neighborhood in Abstraction Space¶
Impossibility of performance sits in a sparse region of the domain-specific corpus (73rd percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.
Family — Microeconomic Theory & Welfare Criteria (13 abstractions)
Nearest neighbors
- Reasonable time — 0.83
- Merger doctrine (property law) — 0.83
- Periculum in Mora — 0.83
- Control chart — 0.83
- Privity of contract — 0.83
Computed from structural-signature embeddings · 2026-10-08