Definition
Legal consideration is consideration that is recognized by law as valid and capable of supporting a binding contract. It is the subset of consideration that courts will actually enforce — distinguishing bargained-for exchanges with genuine legal weight from those that are morally persuasive, socially expected, or commercially customary but legally ineffective.
The broader term "consideration" refers to anything of value exchanged between contracting parties — a promise, an act, a forbearance, or the creation, modification, or destruction of a legal relation. "Legal consideration" adds a qualifier: the thing given or promised must be something the law recognizes as sufficient. It need not be adequate in an economic sense (courts do not generally police fairness of the bargain), but it must be lawful in nature and real in legal effect.
Three core requirements mark a legally sufficient consideration:
1. It must not be illegal or against public policy. A promise to commit a crime, tort, or fraud cannot serve as consideration, regardless of how earnestly the parties intend to be bound.
2. It must constitute genuine legal detriment or benefit. A party incurs legal detriment when they do something they were not already legally obligated to do, or refrain from something they had a legal right to do. Pre-existing legal duties generally do not qualify.
3. It must be bargained for. Something given in the past, or given as a pure gift with no exchange relationship to the return promise, is not legal consideration.
The term is sometimes used loosely to mean simply "valid consideration," but its precise function is to exclude categories of purported consideration that fail on grounds of illegality, immorality, or legal nullity — as opposed to those that fail merely because they are nominal or one-sided.
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Common Language
Modern common usage (Wiktionary): "Consideration" in ordinary English means careful thought, attention, or regard for something or someone — as in "she showed consideration for others."
Historical common usage (Webster's 1913): "Consideration" was defined as the act of considering; continuous careful thought; also, the result of deliberation; motive or reason for action.
The gap here is significant. In everyday English, "consideration" is entirely about mental attention — thinking something through or showing regard. In contract law, it is a technical term of art describing the exchange that makes a promise enforceable. "Legal consideration" sharpens that further: not just any exchange, but one the law will recognize. A researcher encountering the word "consideration" in historical documents must determine from context whether it signals a legal exchange relationship or merely deliberation.
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Common Confusion
LEGAL CONSIDERATION vs. MORAL CONSIDERATION: Moral consideration — a compelling reason of conscience or social obligation — does not qualify as legal consideration unless it also satisfies the legal detriment/benefit test. Courts have historically refused to enforce promises made out of gratitude or moral duty alone (past consideration and moral obligation doctrines), though some jurisdictions recognize limited exceptions where a prior material benefit was conferred.
LEGAL CONSIDERATION vs. ADEQUACY OF CONSIDERATION: Legal consideration addresses whether what was exchanged is lawful and real in legal effect. Adequacy addresses whether it is economically fair. Courts enforce contracts with grossly unequal exchanges so long as the consideration is legally valid — a peppercorn for a house can be legal consideration. Researchers should not conflate a challenge to the legality of consideration with a challenge to its adequacy.
LEGAL CONSIDERATION vs. NOMINAL CONSIDERATION: Nominal consideration (a stated but token exchange, such as "one dollar") occupies contested ground. It may satisfy the legal consideration requirement in some jurisdictions when genuinely bargained for, but courts in others will look past the form to find a disguised gift. The distinction matters enormously in option contracts and deed recitals.
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Why It Matters in Research
The phrase "legal consideration" appears across centuries of contract doctrine, but its function shifts depending on context and era. In older sources, it frequently appears as a shorthand contrast with "illegal consideration" — the point being that the consideration named in the instrument is not tainted by illegality, not that it has been rigorously analyzed for sufficiency. Researchers reading nineteenth-century case law or treatises should be alert to this narrower use.
In modern usage, "legal consideration" tends to be used either in the same shorthand way or as part of a checklist in contract formation analysis. Neither use is wrong, but they are not identical, and conflating them can produce errors when tracing how courts evaluated enforceability across different eras.
The pre-existing duty rule — one of the sharpest limits on what qualifies as legal consideration — has been significantly modified by the Restatement (Second) of Contracts and the Uniform Commercial Code (which largely dispenses with consideration for contract modifications in goods transactions). Research into contract disputes near or after the mid-twentieth century must account for whether UCC Article 2 applies, because the consideration analysis under the UCC diverges substantially from common law doctrine.
Watch also for jurisdiction-specific treatment of moral obligation as consideration. A small number of states recognize the Webb v. McGowin line of authority (allowing past material benefit to support enforcement), which cuts against the strict legal consideration requirement. Historical sources will not reflect these modern exceptions.
Finally, documents reciting "for good and valuable consideration, the receipt of which is hereby acknowledged" are invoking legal consideration by formula. Such recitals raise the nominal consideration problem and, in some jurisdictions, are rebuttable or insufficient for specific performance. Do not read them as conclusive proof of legal consideration without checking the jurisdiction's treatment.
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Historical Dictionary Support
Black's Law Dictionary offers a spare but accurate one-line definition: legal consideration is one "recognized or permitted by the law as valid and lawful; as distinguished from such as are illegal or immoral." This captures the core exclusionary function — legal consideration is defined in opposition to what the law will not recognize — but it does not address sufficiency, the bargain requirement, or the legal detriment test. It is a floor definition, not a ceiling.
The historical sources are notably thin on development of the term as a distinct concept. This is because "consideration" itself carries the heavy doctrinal load in classical contract law; "legal" functions as a modifier to exclude the obviously tainted. Treatise writers like Williston and Corbin analyze the broader doctrine of consideration at length, and their frameworks subsume legal consideration without always labeling it separately. Researchers should look to the parent entries on consideration, enforceability, and illegal contracts in historical sources rather than expecting a rich standalone treatment of the phrase "legal consideration."
The older sources also do not grapple with the UCC's modification of consideration doctrine, the Restatement (Second)'s promissory estoppel as an alternative, or the erosion of the pre-existing duty rule in commercial settings. For post-1950 doctrine, historical dictionaries are incomplete guides.
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Jurisdictional Note
Most American jurisdictions follow the common law consideration framework as restated in the Restatement (Second) of Contracts, but the UCC substantially displaces this in contracts for the sale of goods. A few states recognize moral obligation or past consideration under limited circumstances. Civil law jurisdictions (including Louisiana) use the concept of "cause" rather than consideration, which overlaps with but is not equivalent to the common law doctrine.
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Encyclopedia Cross-Reference
The Law Mind Contracts & Commercial Law Encyclopedia — Contracts: Consideration (Bargained-For Exchange, Legal Detriment): Primary reference for doctrine, elements, and the legal detriment/benefit analysis.
The Law Mind Contracts & Commercial Law Encyclopedia — Contracts: Adequacy of Consideration and Nominal Consideration: Essential companion for understanding where legal consideration ends and adequacy challenges begin.
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