
Unilateral contracts are a common type of agreement in which one party, the offeror, makes a promise in exchange for the completion of a specific task or action by the other party, the offeree. Unlike bilateral contracts, unilateral contracts are one-sided, with no obligation or commitment from the offeree until the task is completed. These contracts are beneficial in various business scenarios when a specific action needs to be incentivized without requiring mutual promises. To be legally valid and enforceable, unilateral contracts must contain essential elements, including a clear and specific offer, acceptance by performance, consideration, and the intention to create a legally binding contract.
| Characteristics | Values |
|---|---|
| Type of contract | One-sided |
| Offeror's obligation | Obligated |
| Offeree's obligation | Not obligated |
| Offeror's right to revoke | Anytime before the offeree begins acting |
| Acceptance | Through performance of the specified action |
| Legally binding | Yes, once the offeree performs the requested act |
| Contract breach | Depends on the clarity of terms and eligibility for payment |
| Examples | Rewards, open requests, insurance policies, hotel stay agreements |
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What You'll Learn

Unilateral vs bilateral contracts
A unilateral contract is a one-sided agreement in which an offeror promises to pay or provide some other form of consideration only after the completion of a specified task by the offeree. In this type of contract, the offer states that payment will be made only after the other party fulfils the required task. Unilateral contracts are primarily one-sided without obligation from the offeree. The offeree does not verbally agree to the terms but accepts by performing the requested action. For instance, a reward offer for a lost dog is a classic example of a unilateral contract. In this scenario, the offeror promises to pay whoever returns their lost dog. The person who eventually finds the dog was not legally obligated to search but chose to act with the expectation of receiving the reward.
In a bilateral contract, both parties negotiate and agree on a promise to perform contractual obligations. It involves mutual promises and obligations between two parties, creating legal obligations for both to fulfil their respective commitments. A bilateral contract contains firm agreements and promises between two parties. For instance, when you buy a dress, receive medical treatment, or purchase a book at a library, you are participating in a bilateral contract. In all of these situations, you are promising to pay a specific amount for the product or service.
The primary distinction between unilateral and bilateral contracts is the amount of reciprocal obligation from both parties. A unilateral contract does not obligate the offeree to accept the offeror's request and there is no requirement to complete the task. On the other hand, a bilateral contract contains firm agreements and promises between two parties.
Unilateral contracts are beneficial when a business wishes to incentivize specific actions without requiring mutual promises. To make a unilateral contract legally binding, four elements must exist: one party makes an offer to another party and both must accept the offer, without coercion or force from either side; consideration is the price paid for the promise or agreement and it does not need to be a monetary payment; both parties must have the full intention to create a binding contract and understand the terms and conditions of the agreement.
Bilateral contracts are the most common type of contract and involve mutual exchanges of promises between parties. These mutual obligations form the foundation of most business relationships, requiring strong contract management security measures.
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Legally binding requirements
A unilateral contract is a one-sided agreement where one party, the offeror, makes an offer to another party, the offeree, who accepts the offer by performing a specified action. The offeror promises to pay only after the completion of the task by the offeree. This type of contract is commonly used in business to incentivize specific actions without requiring mutual promises.
To be legally binding, a unilateral contract must contain certain essential elements that provide clarity and protect both parties. These elements include a clear and specific offer, acceptance by performance, consideration, and the intention to create a legal relationship.
Firstly, the offer must be clear and definite, specifying the exact action or performance required from the offeree. The offer should be specific enough for the offeree to understand what is expected of them and what they will receive in return. This clarity ensures that both parties understand their rights and contractual obligations, reducing the risk of uncertainty or disputes.
Secondly, acceptance in a unilateral contract occurs through performance. The offeree accepts the offer by performing the requested action or service. This is the distinguishing feature of a unilateral contract, where words alone do not create acceptance. The offeree has no obligation to perform the act, and the offeror can revoke the offer at any time before the offeree begins acting upon it.
Thirdly, consideration refers to the benefit or value exchanged between the parties. In a unilateral contract, the offeree's performance of the requested act is typically considered the consideration. This consideration can take various forms, including monetary payment, property, or any other holding that both parties agree upon as acceptable payment.
Lastly, both parties must have the intention to create a legally binding contract. This means that they understand the terms and conditions of the agreement and intend to be legally bound by them. Without this intention, the arrangement may be considered an informal agreement rather than a legally enforceable contract.
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Types of unilateral contracts
A unilateral contract is a one-sided agreement where one party, the offeror, makes a promise in exchange for the completion of a specific action or task by the other party, the offeree. Unlike bilateral contracts, unilateral contracts do not require a mutual exchange of promises and instead incentivize specific actions. Unilateral contracts are formed when an offer is accepted by performing the specified action, and payment is made only after the action is completed.
- Insurance Policies: Insurance policies are a classic example of unilateral contracts. The insurer promises to pay or provide coverage upon the occurrence of certain specified events, such as an accident or illness. The insured individual pays premiums to maintain the policy and receive benefits if the qualifying event occurs.
- Rewards for Lost Pets: Offering a reward for the return of a lost pet is a common example of a unilateral contract. The contract is formed when someone returns the pet, and the offeror is obligated to pay the reward.
- Public Contests: Promotions or contests that offer prizes to the first person or a specific number of people who complete a task are unilateral in nature. For example, "First 100 customers to arrive get a free coffee".
- Service Guarantees: Companies often make unilateral contracts with customers through service guarantees. For instance, a company might offer a discount or refund if their technician doesn't arrive on time.
- Employment Incentives: Employers may offer unilateral contracts to employees through referral bonuses or other incentives for specific actions, such as referring qualified candidates.
- Open Requests: Open requests are a type of unilateral contract where the offeror makes a broad or optional request, and payment is made only when certain specifications are met. This could include requests for information or labour.
These are just a few examples of the types of unilateral contracts that exist. Unilateral contracts can be found in various everyday situations and business scenarios, providing flexibility and incentives for specific actions without requiring mutual commitments.
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How to accept a unilateral contract
A unilateral contract is a one-sided agreement formed when an offer can only be accepted by performing a specified action. This means that the offeree does not verbally agree to the terms but instead accepts the contract by completing the task or action. This is the key difference between unilateral and bilateral contracts, where both parties exchange mutual promises.
For a unilateral contract to be legally valid and enforceable, it must contain certain essential elements that provide clarity and protect both parties. These include a clear and specific offer that outlines the action required for acceptance and the reward that will follow. The offer must be specific enough for the offeree to understand exactly what is expected of them and what they will receive in return.
To accept a unilateral contract, the offeree must perform the requested action. This is the only way to accept this type of contract, and it is important to note that simply beginning to perform is not enough—the entire task must be completed. Once the offeree has completed the performance, the offeror is bound by the contract and must abide by its terms, usually by providing the promised payment or reward.
It is worth mentioning that unilateral contracts can be revoked by the offeror at any time before the offeree begins to perform. However, once the offeree has started physically performing the contract, the offeror can no longer revoke the contract. In the case of reward-type unilateral contracts, such as finding a lost dog, the offeror can revoke the offer at any time as long as they clearly convey the revocation before the completion of the task.
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Common use cases
Unilateral contracts are a common feature of everyday life, and they are particularly useful in certain business scenarios. They are often used when a business wants to incentivise specific actions without requiring mutual promises.
One of the most common use cases of unilateral contracts is reward contracts. For example, when someone posts a reward for their lost pet, wallet, or cellphone. The contract is formed when someone performs the requested act of finding and returning the lost item, and the offeror is obliged to pay the reward.
Another common use case is in the insurance industry. Insurance contracts are unilateral because the insurer promises to pay a certain amount of money or provide specific benefits upon the occurrence of a predefined event, such as a car accident, house fire, or health issue. The policyholder is not obligated to claim these benefits, and the insurer is not obliged to pay out if the event does not occur.
Unilateral contracts are also common in licensing scenarios. For example, when a user purchases software with a "click-wrap" agreement, they simply agree to the terms of service without promising future performance. The provider makes all the promises about how the product will function and what rights the user has, and the user's one-time payment completes their performance.
Promotional contests and competitions are classic unilateral contract structures. Businesses often use them to solicit help from the public or specific groups in obtaining information. For instance, a company might offer a reward for finding a software bug.
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Frequently asked questions
A unilateral contract is a one-sided agreement where one party (the offeror) makes an offer to another party (the offeree) in exchange for the completion of a specific task or action.
Bilateral contracts involve mutual promises and obligations from both parties, whereas unilateral contracts only require the offeror to make a promise, with the offeree under no obligation to complete the task.
Rewards for lost pets, hotel stay agreements, insurance policies, and open requests are all examples of unilateral contracts.
For a unilateral contract to be legally valid and enforceable, it must contain a clear and specific offer, acceptance by performance of the offeree, consideration, and the intention to create a legally binding contract.
A unilateral contract can be revoked anytime before the offeree begins acting upon the specified obligation. However, if the offeree has started acting, the revocation depends on the type of action specified in the contract.
















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