Unilateral Contract vs Void Contract in Law - What is The Difference?

Last Updated Feb 2, 2025

A void contract is a legally unenforceable agreement that lacks essential elements such as mutual consent or lawful purpose, rendering it null from the outset. Understanding the characteristics and implications of a void contract can protect you from entering into agreements that hold no legal value. Explore the rest of this article to learn how void contracts differ from voidable contracts and their impact on your legal rights.

Table of Comparison

Aspect Void Contract Unilateral Contract
Definition A contract that is invalid from the beginning and has no legal effect. A contract where one party promises something in exchange for the act of another party.
Legal Effect Null and unenforceable by law. Enforceable once the requested act is performed.
Parties Involves two or more parties. One promisor and one or more promisees.
Formation Fails to meet essential contract elements (e.g., consent, legality). Formed by a promise in exchange for performance.
Performance No valid performance required; contract is void. Contract becomes valid after performance by the promisee.
Example Agreement to perform an illegal act. Reward offered for finding a lost item.

Introduction to Void and Unilateral Contracts

A Void Contract is an agreement that lacks legal effect from the beginning due to missing essential elements such as capacity, consent, or lawful purpose. A Unilateral Contract involves one party promising an obligation in exchange for the other party's performance, without a reciprocal promise upfront. Understanding these contracts highlights the distinction between contracts that never bind parties legally versus those formed through completed acts.

Definition and Key Features of Void Contracts

Void contracts are agreements that lack legal enforceability from the outset due to factors like illegality, incapacity, or absence of essential elements such as mutual consent, consideration, or lawful object. These contracts hold no legal validity, and neither party can enforce any obligation or claim damages based on the contract. Key features of void contracts include their nullity in the eyes of law, absence of any legal effect, and impossibility of ratification or validation by the parties involved.

Definition and Key Features of Unilateral Contracts

A unilateral contract is a legal agreement where only one party makes a promise, typically in exchange for the performance of a specific act by the other party. Key features include the offeror's obligation to fulfill the promise upon the offeree's complete performance, and that acceptance occurs through actual performance rather than a return promise. Unlike void contracts, which lack legal enforceability from inception, unilateral contracts are valid and enforceable once the requested action is performed.

Legal Basis and Enforceability

A void contract lacks legal effect from the outset due to factors like illegality, incapacity, or mutual mistake, making it unenforceable under contract law principles. In contrast, a unilateral contract is legally binding once the offeree performs the requested act, as established by common law and statutes governing offer and acceptance. Enforceability of unilateral contracts depends on clear offer terms and completed performance, while void contracts cannot be enforced due to fundamental defects in legality or consent.

Essential Elements: Void vs Unilateral Contracts

Void contracts lack one or more essential elements such as mutual consent, lawful consideration, or legal purpose, rendering them unenforceable from the outset. Unilateral contracts involve a promise in exchange for a specific act, with the contract becoming binding once the act is performed. The essential element distinguishing unilateral contracts is the existence of a completed performance, whereas void contracts fail due to defects in formation or legality.

Common Examples and Real-Life Scenarios

Void contracts often arise in situations such as agreements for illegal activities, like a contract to sell prohibited substances, making the contract unenforceable from the outset. Unilateral contracts commonly appear in reward offers, such as a poster promising a monetary reward for finding a lost pet, where the contract is formed only when the requested performance is completed. In real-life scenarios, an employment contract requiring mutual consent may become void if one party lacks capacity, whereas a unilateral contract is illustrated by a promise of payment upon completion of a specific task without a prior agreement.

Consequences of Void Contracts in Law

Void contracts have no legal effect from the outset, making them unenforceable and incapable of creating any legal rights or obligations between parties. Unlike unilateral contracts, which involve one party's promise in exchange for an act by another, void contracts cannot be ratified or validated by any subsequent action. The consequences include restoration of parties to their original positions, no damages for breach, and no legal remedies available, emphasizing the importance of contract validity in legal transactions.

Rights and Obligations in Unilateral Contracts

A unilateral contract creates obligations for the party making the promise once the other party performs the requested act, granting the performing party the right to enforce the contract upon completion. The offeree holds no initial obligation but gains the right to accept by fulfilling the specified conditions, which triggers the promisor's binding duty to pay or deliver agreed consideration. In contrast, a void contract lacks legal enforceability from inception, rendering any purported rights or obligations null and non-binding.

Major Differences: Void Contract vs Unilateral Contract

A void contract is an agreement that lacks legal validity from the outset, making it unenforceable by law, whereas a unilateral contract involves one party making a promise in exchange for the other party's performance. In a void contract, no legal obligations arise, whereas in a unilateral contract, the promisor is legally bound to fulfill the promise once the act is performed by the promisee. The major difference lies in enforceability: void contracts have no legal effect, while unilateral contracts become valid and enforceable upon the requested act's completion.

Choosing the Right Agreement: Practical Implications

Choosing the right agreement between a void contract and a unilateral contract significantly impacts legal enforceability and risk management in business transactions. Void contracts lack legal effect from inception, rendering any promises unenforceable, while unilateral contracts bind only one party upon the completion of a specified act, providing clearer obligations. Understanding these distinctions is crucial for drafting agreements that protect interests, ensure clarity in obligations, and minimize potential disputes in commercial dealings.

Void Contract Infographic

Unilateral Contract vs Void Contract in Law - What is The Difference?


About the author. JK Torgesen is a seasoned author renowned for distilling complex and trending concepts into clear, accessible language for readers of all backgrounds. With years of experience as a writer and educator, Torgesen has developed a reputation for making challenging topics understandable and engaging.

Disclaimer.
The information provided in this document is for general informational purposes only and is not guaranteed to be complete. While we strive to ensure the accuracy of the content, we cannot guarantee that the details mentioned are up-to-date or applicable to all scenarios. Topics about Void Contract are subject to change from time to time.

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