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  • Oct 19,2026

Contract Act, Section 58

Contract Act, Section 58: Alternative Promise Where One Branch Is Illegal

Section 58 of the Indian Contract Act, 1872 governs alternative promises where one alternative is lawful and the other is unlawful, preserving the enforceability of the lawful obligation.

The section provides that only the lawful branch of an alternative promise is enforceable, while the unlawful alternative is void and cannot be recognized due to illegality.

1. Purpose of Section 58

The primary objective of Section 58 is to determine the enforceability of alternative promises where one alternative is lawful and the other is unlawful.

The provision preserves the validity of the lawful alternative while preventing enforcement or performance of obligations prohibited by law.

2. Meaning of an Alternative Promise

An alternative promise is a contractual obligation where the promisor undertakes to perform one out of two or more alternative obligations provided under the agreement.

The contract allows different methods of performance, and the promisor may choose among the alternatives subject to the terms of the agreement and applicable legal provisions.

3. One Alternative Being Lawful

Section 58 first contemplates an alternative that is entirely lawful, meaning it does not violate any statutory provision, public policy, or legal prohibition.

Such a lawful alternative satisfies the requirements of a valid contract and remains capable of enforcement under the law.

4. One Alternative Being Illegal

The second alternative under Section 58 involves an act that is illegal or prohibited by law and is therefore void from the beginning.

Since courts cannot recognize or enforce unlawful promises, no contractual rights or obligations can arise from such an illegal alternative.

5. Enforceability of the Lawful Branch

The section expressly provides that only the lawful branch of an alternative promise is enforceable, and the parties remain bound by the lawful alternative.

The existence of an illegal alternative does not invalidate the lawful obligation, which may be enforced according to the provisions of the Indian Contract Act.

6. Non-Enforceability of the Illegal Branch

The unlawful branch of an alternative promise has no legal effect, and neither the promisor nor the promisee can demand performance of an illegal alternative.

Courts cannot compel the execution of prohibited acts, as the law refuses to provide assistance to agreements involving unlawful obligations.

7. Principle of Severability

Section 58 reflects the contractual principle of severability, where lawful and unlawful alternatives are distinct and separable, allowing the lawful portion of the agreement to survive independently.

The illegal alternative is disregarded while valid contractual obligations are preserved to the greatest extent consistent with the law.

8. Protection of Lawful Transactions

The provision protects genuine commercial transactions by ensuring that parties do not lose the benefit of a valid agreement merely because one alternative option provided in the contract is unlawful.

By preserving the lawful alternative, Section 58 promotes contractual stability and prevents unnecessary invalidation of agreements.

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