Definition
Consideration is the bargained-for exchange of something of legal value between the parties to a contract. Each party must give up something—money, goods, services, a promise to act, or a promise to refrain from acting—in return for what the other party gives. Without consideration, an agreement is usually treated as an unenforceable gift or gratuitous promise rather than a binding contract.
Legal Meaning
Consideration is one of the essential elements of a valid contract, alongside offer, acceptance, and the intent to be legally bound. In the law of business and commercial agreements, it is the legal "glue" that turns a promise into an enforceable obligation. The classic formulation describes consideration as a "bargained-for exchange": each party must give something and receive something in return, and the giving and receiving must be linked—the promise must be made because of the return promise or performance.
Consideration can take many forms. It may be a benefit conferred on the promisor or a detriment suffered by the promisee. A detriment can mean doing something you were not legally required to do, or giving up a legal right—such as promising not to file a lawsuit you could otherwise bring. A promise to do something in the future can itself be consideration, which is why both parties to a contract can be bound the moment they exchange promises, even before either has acted.
Importantly, courts do not weigh whether the exchange was fair. The "adequacy" of consideration is not examined; even a token amount can support a contract so long as it reflects a genuine bargain. What the law cares about is that real value was exchanged, not whether the parties struck a good deal.
Key Points
- Consideration is an essential element of most enforceable contracts
- It must be a bargained-for exchange, not a gift or gratuitous promise
- It can be money, goods, services, or a promise to act or to refrain from acting
- Courts do not judge whether the consideration was fair or equal in value
- Past consideration—something already done—generally does not count
- Performing a pre-existing legal duty is usually not valid consideration
- Promissory estoppel can sometimes enforce a promise lacking consideration
- Modifying an existing contract may require fresh consideration in many states
Real-World Example
A homeowner offers a landscaper $2,000 to design and install a new garden. The landscaper agrees. Here, consideration flows both ways: the homeowner promises to pay money (a benefit to the landscaper and a detriment to the homeowner), and the landscaper promises to perform the work (a benefit to the homeowner and a detriment to the landscaper). Because each party has bargained for and given something of value, the agreement is an enforceable contract.
Contrast that with a neighbor who simply promises to give the homeowner a free shrub "out of the goodness of his heart." Because the homeowner gives nothing in return, there is no consideration and no enforceable contract—it is a gift promise the neighbor can withdraw before delivery.
Valid vs. Invalid Consideration
| Scenario | Valid Consideration? | Why |
|---|---|---|
| Promise to pay money for goods or services | Yes | Each party gives and receives value |
| Promise to refrain from a legal right (e.g., not to sue) | Yes | Giving up a right is a legal detriment |
| A nominal or token amount in a real bargain | Usually Yes | Adequacy is generally not examined |
| A gift with nothing given in return | No | No bargained-for exchange |
| Past act done before the promise | No | Past consideration was not bargained for |
| Performing a duty already legally owed | Usually No | Pre-existing duty rule |
| An illusory promise (no real obligation) | No | Nothing of value is actually promised |
Common Consideration Problems
Several recurring issues can undermine an otherwise valid contract:
Past Consideration
If a person performs a service and the other party later promises to pay for it as a thank-you, that promise is generally unenforceable. The performance was not bargained for in exchange for the later promise.
Pre-Existing Duty Rule
Promising to do something you are already legally bound to do is typically not new consideration. For example, a contractor who demands more money to finish a job already covered by the original contract may not be entitled to it unless something has genuinely changed.
Illusory Promises
A promise that leaves the promisor free to perform or not—"I will buy from you if I feel like it"—is illusory and provides no consideration because the promisor has not actually committed to anything.
Contract Modifications
Under traditional common law, modifying a contract often requires fresh consideration. The UCC relaxes this for sales of goods, allowing good-faith modifications without new consideration. Rules vary by state, so confirm the governing law before relying on a modification.
Exceptions: When Consideration Is Not Required
The strict consideration requirement has well-recognized exceptions. Promissory estoppel can enforce a promise when one party reasonably and foreseeably relied on it to their detriment, and injustice can only be avoided by enforcing it. Some states enforce certain written promises, options, or firm offers under the UCC even without consideration. Many states also enforce charitable subscriptions and certain promises to pay debts barred by the statute of limitations under specialized rules. Because these doctrines vary, their availability depends on your state's law.
Related Terms
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A business attorney can confirm your agreement is supported by valid consideration and is enforceable before you sign.
Explore Business LawWhen You Need a Lawyer
Consideration problems often surface only when a deal goes wrong and one side tries to back out. You should consult an attorney if:
- You are unsure whether your agreement is supported by valid consideration
- The other party claims your contract is unenforceable as a gift or promise
- You want to modify an existing contract and worry about the need for new consideration
- Someone is relying on a promise you made and now claims promissory estoppel
- A high-value or long-term business agreement is involved
An attorney can structure your agreement so the exchange is clear and enforceable, and can advise whether an exception like promissory estoppel applies. For help selecting counsel, see our guide on how to choose a lawyer.
Frequently Asked Questions
Why is consideration required for a contract?
Consideration is what distinguishes an enforceable contract from a mere promise or gift. The law generally will not enforce a one-sided promise to give something for nothing. By requiring each side to give and receive something of value, consideration shows that the parties intended a genuine bargain rather than a casual or gratuitous statement.
What counts as valid consideration?
Valid consideration is anything of legal value that is bargained for and exchanged. It can be money, goods, services, a promise to do something, or a promise to refrain from doing something you have a legal right to do. The key is that each party must give up something or take on a new obligation in exchange for the other party's promise.
Does consideration have to be fair or equal in value?
No. Courts generally do not weigh whether the exchange was fair or whether the amounts were roughly equal—this is called the rule against inquiring into the adequacy of consideration. As long as something of real legal value is exchanged, the contract is valid even if it later looks like a bad deal. Grossly unequal terms may, however, raise issues of fraud, duress, or unconscionability.
Is a past act good consideration?
Generally no. Past consideration—something already done before the promise was made—does not support a new contract because it was not bargained for in exchange for the promise. Likewise, performing a duty you were already legally bound to perform usually is not valid consideration under the pre-existing duty rule.
Can a contract be enforced without consideration?
Sometimes. The doctrine of promissory estoppel may allow a court to enforce a promise without consideration when one party reasonably relied on the promise to their detriment and injustice can only be avoided by enforcement. Certain promises in writing under the UCC, and some charitable pledges, may also be enforced under specific rules that vary by state.