Yes. Under U.S. common law, consideration is required for a contract to be enforceable in nearly every case. Each side has to give up or promise something of value in return for what the other side is giving. A promise without that exchange is treated as a gift, not a contract, no matter how clearly it was made or how much the other person was counting on it. A handful of doctrines (promissory estoppel, certain Uniform Commercial Code rules, charitable pledges, and sealed contracts in a few states) can rescue a promise that lacks consideration, but they are narrower than most people expect.
What Consideration Actually Means
Consideration is a bargained-for exchange. You promise or do something because the other party promised or did something in return. The Restatement (Second) of Contracts § 71 puts it this way: a performance or return promise is consideration only if the promisor sought it in exchange for their own promise and the promisee gave it in exchange for that promise.1Bruckner (Howard Law) Contracts 2024. Restatement (Second) of Contracts 71
Both sides have to be giving something up or taking something on. That reciprocity is what separates a contract from a gratuitous promise. A homeowner paying a painter for labor is the textbook case: money moves one way, work moves the other, both sides agreed to it.2Cornell Law School. Consideration If reciprocity is missing, a court treats the promise as a gift and will not enforce it.
What Qualifies as Consideration
Consideration can take three forms: a return promise, a specific act, or forbearance. Forbearance is agreeing not to do something you have a legal right to do. Dropping a lawsuit in exchange for a settlement is forbearance, and it counts even if the claim might have lost in court, as long as you had a reasonable, good-faith belief in it when you released it.
Courts almost never ask whether what you got was worth what you gave. This is sometimes called the peppercorn rule: a trivially small payment can support a contract if the parties genuinely bargained for it. A parent could sell a house to a child for one dollar and have the deal enforced, provided that dollar was really the agreed price. Judges don’t rescue people from bad bargains.
Nominal consideration is different from sham consideration. If the stated payment is never actually made, or if the “exchange” was invented after the fact to dress up a gift, a court can look past the label. Low value by itself won’t void a contract, but it can be evidence of fraud, duress, or the absence of a real bargain.
Option contracts show consideration doing concrete work. When you pay to keep an offer open for a set period, that payment is the consideration that makes the seller’s promise irrevocable. Without it, the seller could pull the offer at any time.3Legal Information Institute. Option Contract
What Looks Like Consideration but Isn’t
Several things feel like consideration and fail the test. These are where most informal arrangements collapse.
Past Consideration
If someone did you a favor and you later promise to pay them for it, that promise usually lacks consideration. The earlier act wasn’t bargained for in exchange for the new promise. It was already finished. You can’t retroactively convert a completed favor into the basis of a contract.
There is a narrow exception. Under Restatement (Second) of Contracts § 86, a promise made in recognition of a benefit previously received can be enforced “to the extent necessary to prevent injustice.” It applies when someone provided a real, tangible benefit (not a gift they chose to give) and you later promised to compensate them. The promise won’t stand if the original benefit was freely gifted or if the promised payment is wildly disproportionate to what was received.
Moral Obligation
Gratitude isn’t consideration. Feeling that you owe someone doesn’t create a contract. Courts have consistently held that the impulse to repay, by itself, can’t turn a bare promise into a binding one.
Illusory Promises
A promise that doesn’t actually commit you to anything is no promise at all. If a contract says a seller “agrees to sell as much product as they feel like selling,” the seller has reserved total discretion and promised nothing.4Legal Information Institute. Illusory Promise Because only one side is bound, the agreement fails for lack of consideration. This trap shows up often in loosely drafted requirements contracts and employment agreements.
The Pre-Existing Duty Rule
Promising to do something you’re already legally required to do isn’t new consideration. If a contractor agrees to build your deck for $10,000 and halfway through demands $12,000 for the same work, your agreement to pay more may be unenforceable. The contractor hasn’t offered anything new.5Legal Information Institute. Pre-Existing Duty Doctrine The rule exists to prevent mid-performance coercion.
If the contractor agrees to additional or different work in exchange for the higher price, that new obligation is fresh consideration and the modification holds. The UCC also carves out a wider exception for contracts for the sale of goods, discussed below.
When a Contract Is Enforceable Without Consideration
The common law requirement is the default, not the only rule. Several doctrines enforce promises when consideration is missing.
Promissory Estoppel
When someone makes a clear promise, reasonably expects the other person to rely on it, and that person does rely to their detriment, a court can enforce the promise under promissory estoppel. Restatement (Second) of Contracts § 90 treats this as a safety valve: the promise becomes binding “if injustice can be avoided only by enforcement.” The remedy may be limited to what fairness requires rather than full contract damages.
Employment is a common setting. If an employer promises you a job, you quit your current position and relocate, and the employer then rescinds the offer, a court could hold the employer to the promise even though you hadn’t started work and no traditional consideration existed. Proving the claim takes clear evidence that the promisor knew their words would prompt action.
Charitable Subscriptions
Restatement § 90 also addresses charitable pledges. Under subsection (2), a charitable subscription is binding without proof that the promise actually induced the charity to take any particular action. In practice, courts have enforced large donation pledges on several theories: sometimes finding consideration in the charity’s promise to name a building after the donor, sometimes relying on detrimental reliance when the organization hired architects or launched a capital campaign on the strength of the pledge. A few states enforce charitable pledges as a matter of public policy, with or without consideration or reliance.
UCC Firm Offers
Under the Uniform Commercial Code, a merchant who makes a written, signed offer to buy or sell goods and promises to hold it open cannot revoke it during the stated period, up to three months, even without payment for that right.6Cornell Law School. Uniform Commercial Code 2-205 – Firm Offers At common law, the same offer could be pulled at any time. The UCC overrides that rule for merchants to match how commercial deals actually work, where a supplier’s written commitment to hold pricing for 60 days is standard.
UCC Contract Modifications
The UCC also eliminates the consideration requirement for modifying an existing contract for the sale of goods. Under § 2-209, a modification needs no new consideration to be binding.7Cornell Law School. Uniform Commercial Code 2-209 – Modification, Rescission and Waiver The modification must be made in good faith. A buyer who threatens to walk away unless the seller drops the price, with no legitimate business reason, won’t get the benefit of the rule. Courts treat that kind of pressure the same way they treat coercion under the pre-existing duty doctrine.
Contracts Under Seal
A sealed contract was the historical formal substitute for consideration. More than half of U.S. states have abolished the legal distinction between sealed and unsealed instruments. In the remaining states, a sealed contract either binds without consideration or creates a strong presumption that consideration existed. Delaware and New Jersey are among the jurisdictions where the seal still carries weight. For most people, this is a historical point rather than a practical tool.
What Happens If Consideration Is Missing
A promise that lacks consideration and fits no exception is unenforceable. Courts call it a “bare promise” and will dismiss a lawsuit built on it. You can’t recover damages, force performance, or get any other contract remedy, because in the law’s eyes no contract ever formed.
This is where people get hurt. Someone promises to give you money, transfer property, or cover a debt. You plan around the promise. When they back out, you learn that without consideration you have no claim. The only possible lifeline is promissory estoppel, and it demands more than disappointment: evidence that the promisor expected their words to change your behavior, that your behavior actually changed in a significant way, and that leaving you without a remedy would be genuinely unjust.
If real money or obligations are at stake, make sure both sides are giving something up. A written agreement with clear terms and mutual obligations is the most reliable way to ensure a court will enforce the deal. Consideration doesn’t need to be elaborate or expensive. It does need to exist.