The rule
Contract Law

Certain obligations imposed by law resemble contracts though no agreement exists — a person shall not enrich themselves unjustly at another's expense.

Explanation

Quasi-contracts are a distinctive creation of Indian contract law that recognizes certain legal obligations arising not from agreement or consent, but from the law itself. The foundational principle—that no person shall be permitted to enrich themselves unjustly at another's expense—appears prominently in the Indian Contract Act, where certain situations are treated as if contractual obligations exist, even though the parties never agreed. This mechanism exists because sometimes fairness and justice demand that one party compensate another for benefits received, even when no formal contract bound them. Think of quasi-contracts as the law's way of preventing windfalls: where A receives something valuable meant for B, or where A performs work that benefits B without any contract between them, the law steps in and creates an obligation to pay, as if a contract had been made. This is fundamentally different from true contracts because there is no agreement, no offer and acceptance, no exchange of promises—yet the legal outcome resembles a contractual debt. The quasi-contract doctrine recognizes five broad categories: (1) supply of necessaries by one person to another incapable of contracting; (2) payment by one person of money due from another; (3) payment for acts done without request but beneficial to another; (4) goods delivered by mistake or under coercion; and (5) benefits conferred under void agreements. The statutory framework treats these obligations as contractual in nature, allowing the enriched party to be sued for recovery as though a debt existed. The genius of this doctrine is that it bridges a gap: situations too numerous and varied to regulate by contract law alone, yet demanding legal remedy to prevent unfair enrichment, are brought within the compensatory framework. Unlike contract law which emphasizes freedom and consent, quasi-contract law emphasizes restitution and justice. The remedy available is typically monetary compensation equal to the reasonable value of the benefit received. Courts measure this by the cost to the provider or the market value of the benefit, whichever is more appropriate. However, the remedy is not punishment; it is restoration to the position the enriched party would have been in had they not received the benefit. Understanding quasi-contracts requires appreciating that the law sometimes creates enforceable obligations without the parties' agreement, stepping in where morality demands redress but contract principles do not apply.

Application examples

Scenario

A doctor, passing an accident site, renders emergency medical treatment to an unconscious stranger, incurring expenses of ₹5,000 for medicines and care. The stranger recovers and refuses to pay, claiming no contract existed and he never requested treatment. The doctor seeks recovery of the amount spent.

Analysis

This situation falls squarely within quasi-contract principles. The stranger received a clear benefit (medical care), the doctor conferred it without request, the stranger did not pay, and the doctor has thereby enriched the stranger. Although no contract exists—no agreement, no offer-acceptance—the law recognizes an obligation because it would be unjust for the stranger to retain the benefit without payment. The stranger was incapable of contracting at the time (unconscious), strengthening the claim.

Outcome

The doctor may recover reasonable remuneration for the medical services rendered, measured by the reasonable cost of such treatment. The court will award compensation not as contract damages, but as restitution for the enrichment the stranger received and retained.

Scenario

A shopkeeper, intending to deliver rice to customer A, mistakenly delivers identical rice sacks to neighbor B. Neighbor B consumes half the rice before the error is discovered. When the shopkeeper demands payment, B refuses, saying he did not order the rice and the delivery was the shopkeeper's mistake.

Analysis

The core quasi-contract principle applies here: B received a benefit (rice worth ₹2,000), the benefit was conferred by the shopkeeper, B retained and consumed part of it without payment, and B's position is thereby improved at the shopkeeper's expense. The fact that delivery was mistaken does not negate the enrichment; rather, it triggers quasi-contract liability because the law will not allow one to profit from another's mistake. B's lack of request is irrelevant; quasi-contracts operate outside the consent framework.

Outcome

The shopkeeper may recover from B the reasonable value of rice consumed (measured by its market price or cost to the shopkeeper), treating the obligation as if a contract for sale existed. B cannot escape liability by claiming he did not contract for the rice; the law creates the obligation independently.

Scenario

An insurance policy is declared void from inception due to the assured's non-disclosure of material facts. Before the policy is voided, the insurer pays a claim of ₹10 lakhs to the assured. After discovering the fraud, the insurer demands return of the payment, claiming the void agreement means the assured was unjustly enriched.

Analysis

This presents a quasi-contract claim under the category of benefits conferred under void agreements. The assured received ₹10 lakhs payment (a clear benefit), the money was transferred under a void policy (not a valid contract), and the assured was thereby enriched. However, a critical element requires scrutiny: whether the assured was innocent or complicit in the voidness. If the assured fraudulently concealed material facts, the enrichment is particularly unjust and quasi-contract liability is strong. Even if innocent, retaining benefits from a void agreement that was never valid creates unjust enrichment.

Outcome

The insurer may recover the payment amount through quasi-contract, treating the obligation to return as arising from law, not from any contract. The measure of recovery is the full amount transferred, as that represents the enrichment. The assured's knowledge or innocence may affect equitable defenses but not the fundamental liability.

Scenario

A builder contracts to construct a house for Owner A for ₹50 lakhs. After completing 80% of work, a void condition (eg. lack of required governmental approval) is discovered, rendering the contract void. The builder has incurred ₹45 lakhs in expenses. Owner A has received substantial benefit (an 80% constructed house worth approximately ₹40 lakhs in the current market).

Analysis

Although the contract is void and unenforceable, the builder has conferred substantial benefit on Owner A through work performed. The contract being void does not erase the fact that Owner A is enriched and has retained that enrichment. Quasi-contract principles intervene here to create an obligation to compensate for the value of work done and materials supplied, even though the original contract cannot be enforced. The measure is not full contract price but the reasonable value of the benefit actually received and retained by Owner A.

Outcome

The builder may recover through quasi-contract the reasonable value of work and materials supplied, likely the market value of a partially constructed house or the fair value of labor and materials, whichever reflects the actual enrichment. This prevents Owner A from obtaining a substantial asset (80% constructed house) without compensating the builder, even though the contract that would have governed full compensation is void.

How CLAT tests this

  1. CLAT examiners often introduce an element of 'consent after enrichment'—the facts describe B receiving a benefit without consent, but then B acknowledging receipt or using the benefit. The twist asks whether mere post-facto acknowledgment transforms a quasi-contract into a real contract. The trap: it does not; quasi-contract liability arises from the enrichment itself, and subsequent acknowledgment does not retroactively create contractual consent.
  2. Distortion of party roles: The scenario describes a person who incurs losses while preventing another's loss (e.g., A spends ₹1,000 to prevent B's property from damage worth ₹10,000). CLAT often asks whether A can recover ₹1,000 as quasi-contract. The trap: recovery in such cases is limited to the actual benefit conferred and retained, not losses incurred; A recovers not the cost but the value of the benefit to B.
  3. Confusion with tort law: CLAT frequently presents scenarios where B's action causes A loss, and asks whether A can sue under quasi-contract (unjust enrichment) instead of tort. The confusion: quasi-contract requires that B be enriched by A's loss; if B simply caused harm without gaining benefit, tort (not quasi-contract) applies. The trap is mixing two distinct doctrines.
  4. Subtly missing consent where it matters: The facts describe a situation where there is silence (not action) suggesting consent—e.g., A sends goods to B, who receives them but says nothing. CLAT asks if acceptance by silence constitutes quasi-contract. The trap: quasi-contracts do not require acceptance or silence; they apply automatically when enrichment is established, regardless of the enriched party's knowledge or conduct.
  5. Scope-creep importing damages doctrine: CLAT sometimes presents facts resembling quasi-contract but asks for damages (cost of replacement, lost profit, etc.) rather than restitution. The trap: quasi-contract liability is limited to restitution of the actual benefit received, not expectation damages or consequential loss, which belong to contract or tort law. Examiners distort recovery by conflating branches.

Related concepts

Consideration

Practice passages

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