Definition
Dependent promises are mutual promises in a contract where the performance obligation of one party is conditioned on the prior or concurrent performance of the other. Neither party can demand performance from the other without first performing — or being ready and willing to perform — their own corresponding obligation. The dependency relationship means that the failure or refusal of one party to perform their side discharges the other party's duty to perform theirs.
Dependent promises stand in contrast to independent promises, where each party's duty to perform exists regardless of whether the other party has performed. The distinction is foundational to contract law: it determines whether a party who has not yet received performance from the other side is in breach, or is simply not yet obligated.
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Common Confusion
DEPENDENT PROMISES vs. INDEPENDENT PROMISES: The distinction turns on whether performance obligations are linked. In a contract with independent promises, each party must perform regardless of the other's performance — breach on one side does not excuse the other. With dependent promises, the sequencing or simultaneity of performance matters: a party cannot sue for breach without showing they have performed or tendered their own obligation first. Historical sources, including Bouvier's, consistently frame this as the defining contrast, and it remains the operative distinction in modern contract doctrine.
DEPENDENT PROMISES vs. CONDITIONS PRECEDENT: A condition precedent is an event that must occur before a duty arises; it need not be something either party promised to do. A dependent promise, by contrast, is a promise by one of the parties whose performance functions as a condition on the other party's duty. The two concepts overlap — the performance of a dependent promise operates as a condition — but they are not identical. Equating the two can cause analytical errors, particularly when the triggering event is outside either party's control.
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Core Elements
For promises to be treated as dependent rather than independent, courts and commentators have generally required:
1. MUTUAL PROMISES: Both parties must have made enforceable promises in the same contract or transaction.
2. LINKED PERFORMANCE: The performance of one promise must be logically or contractually tied to the performance of the other — either by explicit language or by the evident intent and structure of the agreement.
3. SEQUENCING OR SIMULTANEITY: There must be a discernible order — one party performs first and that performance triggers the other's obligation — or the obligations must be concurrent, each conditioned on the other's simultaneous tender.
4. PRIOR CONDITION: The party seeking to enforce the other's promise must have either performed their own dependent obligation or have a legally recognized excuse for non-performance.
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Why It Matters in Research
The dependent/independent distinction is one of the oldest analytical moves in contract law, and sources across centuries handle it with varying terminology. Researchers should be alert to several navigational issues.
Terminology instability: Older sources, including Bouvier's, use "dependent" and "independent" as the primary frame. Modern doctrine often absorbs the same analysis under the headings of "conditions," "concurrent conditions," or "constructive conditions of exchange." The Restatement (Second) of Contracts largely replaced the dependent/independent vocabulary with the concept of constructive conditions — so searching for "dependent promises" in post-1970s sources may return sparse results even when the underlying doctrine is extensively treated.
Practical consequence in pleading: The dependent/independent distinction directly affects what a plaintiff must allege and prove. A party suing on a dependent promise must plead and prove their own prior performance or excuse. Researchers tracking litigation strategy in historical materials should look for how courts treated performance and tender allegations as threshold requirements, not merely damages issues.
Employment context: Implied contract claims in employment disputes — particularly those arising from handbooks and policy documents — often turn on whether employer and employee obligations are framed as dependent or independent. A promise of continued employment conditioned on satisfactory performance is structurally a dependent promise framework. See the employment encyclopedia entry noted above for how this surfaces in wrongful termination analysis.
Corpus connections: Entries on CONDITIONS, CONSIDERATION, CONCURRENT CONDITIONS, and BREACH in the Law Mind corpus will frequently be the more productive search targets in modern materials, even when the underlying doctrine is what Bouvier's would have called dependent promises.
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Historical Dictionary Support
Bouvier's Law Dictionary provides the core formulation: mutual promises are dependent when "the performance of one promise depends on the performance of the other, and, therefore, until the prior condition is performed, the other party is not liable on his promise." The illustrative example — one party promising to keep buildings in repair, conditioned on the other first putting them into repair — captures the essential logic cleanly.
Bouvier's cross-reference to Leake on Contracts situates the doctrine within the treatise tradition that dominated nineteenth-century contract analysis. Leake's treatment, like Bouvier's, organized the field around the dependent/independent axis as a primary structural distinction.
What historical sources understate: They do not fully develop the doctrine of constructive conditions, which later became the dominant analytical framework. The shift — associated particularly with the influence of Williston and the Restatements — reframed dependent promises not merely as a classification of mutual obligations but as a judicially implied condition structure designed to prevent unjust enrichment and forfeiture. This evolution is largely invisible in Bouvier's era sources, which treat dependency as a matter of express agreement or evident intent rather than judicial construction.
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Jurisdictional Note
The dependent/independent promise distinction is recognized across common law jurisdictions, but the vocabulary varies. English and Commonwealth sources may retain older terminology longer than American sources. In U.S. jurisdictions, the Restatement framework has largely standardized analysis around constructive conditions, but the underlying doctrine — that a party who has not performed cannot demand the other's performance — is uniform.
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