In a unilateral contract, an offer invites performance rather than a promise in return. The classic question is whether the offeror may revoke the offer before the offeree completes the requested performance. While the general rule favors revocation flexibility, several important exceptions limit an offeror’s right to rescind. This article explains when an offeror cannot rescind a unilateral contract offer, with practical guidance and common legal principles used in U.S. courts.
Understanding Unilateral Contracts And Revocation
A unilateral contract is formed when one party makes an offer that is accepted by performing a specified act. No promise is exchanged until the performance is complete. The offeror typically retains the right to revoke the offer at any time before performance is completed. However, this right is not absolute, and certain circumstances—such as partial performance, reliance, and option-based arrangements—create constraints on revocation.
When Partial Performance Triggers Protection From Revocation
The strongest limits on revocation arise when the offeree has begun performance. Courts recognize that the offeree’s starting of performance signals acceptance, creating a quasi-contractual obligation for the offeror to honor the deal at least to the extent of the offeree’s conduct.
Key points include:
- Beginning Performance: If the offeree starts the specified act, the offeror’s ability to revoke becomes restricted. The moment performance begins, the offeree has begun to fulfill the contract, and revocation is typically not effective for the portion already performed.
- Substantial Performance: Some jurisdictions emphasize that if the offeree’s performance is substantial and continuing, revocation is unlikely to be effective for the already-started performance, especially if the offeree has incurred costs or has reasonably relied on the offer remaining open.
- Partial Performance Is Not Always Enough: Merely starting a related preparatory step (e.g., gathering materials) without actual performance may not trigger protection. Courts focus on the act of performance itself.
Promissory Estoppel And Reliance
Promissory estoppel can bar revocation when the offeree reasonably relies on the offer and suffers a detriment if the offer is revoked. In unilateral contracts, this doctrine may apply if:
- The offeror makes a clear promise that the offer will stay open or that performance will be rewarded.
- The offeree reasonably relies on that promise by beginning or continuing performance.
- Detrimental reliance occurs, such as incurred expenses or foregone opportunities.
When promissory estoppel applies, the offeror may be required to honor the offer or compensate the offeree for reasonable reliance damages. Courts often balance the specificity of the promise, the degree of reliance, and the fairness of enforcement.
Option Contracts And Explicit Open Offers
Two legal devices routinely prevent revocation in unilateral contexts:
- Option Contracts: If the offeror and offeree sign an option agreement, the offeror agrees to keep the offer open for a specified time in exchange for consideration. During the option period, the offeror cannot revoke.
- Explicit Open Offers: Some offers are drafted as open-ended commitments. For example, an offer states, “I will pay $X for any time Y occurring within Z.” Depending on jurisdiction, this language can create an obligation to pay upon performance within the stated window, limiting revocation.
Unilateral Contracts And Public Offers
Public offers, such as advertised rewards, create special rules. The performed act (e.g., returning a lost item or solving a puzzle) typically completes the contract. Revocation must be communicated to all potential performers, and the offeree’s actual performance generally completes the contract when the terms are met. Courts scrutinize notice timing and whether the public offer was genuine and intended to be open.
Legal Standards In Key Scenarios
Different fact patterns produce different outcomes. Consider these common scenarios and the prevailing reasoning courts often apply:
- Begin Performance Before Revocation: If an offeree begins the requested act before the offeror revokes, the contract generally stands for the portion completed.
- Revocation After Substantial Performance: If the offeree has substantially completed the performance and the offeror attempts to revoke, courts are more likely to view revocation as ineffective for the completed portion.
- No Performance Yet Started: If no performance has begun, the offeror typically may revoke unless an option or promissory estoppel applies.
- Costs Incurred By Offeree: If the offeree has incurred irreversible costs in reliance on the offer, promissory estoppel or a similar doctrine may prevent revocation.
Practical Guidance For Offerors And Offerees
Both sides should track performance milestones and communications carefully. Practical takeaways include:
- Document Beginnings: Offerees should document when they began performance and what actions were taken.
- Clear Communication: Offerors should provide clear terms about revocability or open-offer periods, preferably in writing.
- Consideration For Options: If keeping an offer open is important, use an option contract with explicit consideration and a fixed open period.
- Evaluate Reliance: If the offeree has invested substantial resources, assess whether promissory estoppel applies and the potential damages.
Summary Of Key Takeaways
In a unilateral contract, the baseline rule allows revocation until performance is completed. However, revocation is often barred or constrained when: the offeree begins performance, substantial performance has started, promissory estoppel applies due to reasonable reliance, or an option/open-offer arrangement exists. Public offers also carry unique considerations about notice and open participation. Understanding these principles helps both offerors protect their interests and offerees safeguard their rights when pursuing unilateral contract objectives.