Consideration in a Contract Explained (2026)

Consideration is the thing each side gives up or promises in exchange for the other side's promise. In common law systems it is one of the ingredients that turns a promise into a binding contract. Put simply, a contract is a bargain, and consideration is the price of the bargain. Without it, in most common law contracts, a promise is just a promise and a court will not enforce it. This page explains what counts as consideration, the rules that matter, and where the concept does not apply. ## Why a contract needs consideration Common law does not enforce every promise. It enforces bargains. If you promise to give someone a gift and change your mind, they generally cannot sue you, because they gave nothing in return. But if you promise to sell them your car for an agreed price and they promise to pay, each side has given something: the car and the money. That mutual exchange is consideration, and it is what makes the agreement a contract rather than a bare promise. The requirement forces parties to actually strike a deal. It separates serious, bargained-for commitments from casual or one sided statements of intent. ## What counts as consideration Consideration can be a benefit to the promisor or a detriment to the promisee. It usually takes one of these forms: - Money, goods, or services provided.

• A promise to do something you are not already bound to do.
• A promise to not do something you are entitled to do, such as agreeing not to sue. Two important points follow. First, consideration must move from the promisee: the person seeking to enforce the promise must have given something. Second, the exchange must be part of the same bargain; a past act done before the promise was made usually does not count, which is the rule that past consideration is not good consideration. ## Consideration must be sufficient but need not be adequate This is a rule people often misread. The law requires that consideration has some value in the eyes of the law (it must be sufficient), but it does not require the exchange to be fair or equal (it need not be adequate). You can sell something worth a great deal for a token amount, and the token still counts as consideration. Courts do not police whether parties made a good bargain; they only check that a bargain exists. A nominal sum, sometimes a small token amount, is often used precisely to satisfy this rule. ## Some practical rules with examples - Past consideration: if someone fixes your fence, and afterwards you promise to pay them, that later promise may be unenforceable because the work was already done before the promise. The act was not given in exchange for the promise.
• Existing duty: promising to do something you are already legally bound to do is generally not fresh consideration. If a supplier is already contracted to deliver and then demands more money for the same delivery, that extra promise may lack consideration, though there are exceptions where genuine extra benefit is given.
• Part payment of a debt: historically, agreeing to accept part payment in full settlement of a larger debt could be unenforceable for lack of consideration, though this area has important exceptions and has been softened in some jurisdictions. These rules vary in their modern application, so treat them as the traditional starting point rather than a fixed answer. ## When consideration is not needed: deeds and civil law Two big exceptions matter. First, a deed does not need consideration. If a promise is made in a properly executed deed, it is binding even though nothing is given in return, which is why guarantees, releases, and voluntary gifts are often made by deed. Second, the whole doctrine of consideration is a feature of common law. Many civil law jurisdictions do not use it at all and rely instead on concepts such as cause or simply the serious intention of the parties. So whether consideration is even required depends on the governing law of the contract. ## Promissory estoppel, briefly Some jurisdictions recognise promissory estoppel, which can make a promise partly enforceable even without consideration, where one party reasonably relied on the promise to its detriment and it would be unfair to allow the promisor to go back on it. It is a shield in some systems and a limited sword in others, and its scope varies, so it is a backstop, not a substitute for proper consideration. ## Common mistakes to avoid - Relying on a one sided promise with nothing given in return; use a deed if there is no consideration.
• Promising extra payment for something a party is already obliged to do, then being surprised it is not binding.
• Documenting a reward for work already done as if the past act were the consideration.
• Assuming consideration is required when the contract is governed by a civil law system that does not use the doctrine.
• Forgetting that a variation of an existing contract may itself need fresh consideration or a deed in some jurisdictions. ## Jurisdiction note Whether consideration is required at all, and how the detailed rules apply, varies between common law systems such as the US, UK, and India and civil law systems that do not use the doctrine. This page is general information, not legal advice. For an important arrangement, confirm the requirements under the governing law with a qualified lawyer. ## Making sure your promises are actually binding The practical risk is signing a document that does not bind because a promise lacked consideration or a variation was not properly supported, especially when deals change over email. Drafting with the right form (a contract with clear mutual consideration, or a deed where there is none), and reviewing variations to check they are properly supported, is easier when drafting and review live in one AI workspace built on Claude. Adira drafts in the right form and flags weak or missing terms, with transparent per-seat pricing. Learn more. The guidance above stands on its own. ## Bottom line Consideration is the price of a bargain: the thing each side gives in exchange for the other's promise, and in common law it is usually needed to make a promise enforceable. It must be sufficient but need not be adequate, it must move from the person enforcing it, and past acts generally do not count. Where there is no consideration, use a deed, and remember the doctrine does not exist in many civil law systems.