Obligation

Picture a pair of handcuffs joining two people. Neither can walk away from the other until the lock is opened. The Romans used exactly that image: an obligation is a vinculum juris, a chain of law, binding the debtor to the creditor until the debt is paid, the promise kept, or the loss made good. A duty not to trespass is owed to everybody and ties you to no one in particular. An obligation ties you to one person, and it is released only by performance or some other recognised mode of discharge. This note explains what the chain is, where it comes from, how it is classified, and how it differs from duty and liability.

1. Meaning and Definition

Salmond's definition has three parts, and each matters. An obligation is a right in personam: it avails against a determinate person, not against the world (compare the owner's right in rem: see Note 76). It is proprietary: it forms part of the creditor's estate, can be valued in money and is usually transferable, as a debt is. Rights in personam that are personal rather than proprietary, such as the rights arising from marriage, are not obligations in Salmond's sense. And the word is two-sided: seen from the creditor's side it is a right, from the debtor's side a duty. English lawyers tend to use 'obligation' for the duty side, the Romans for the whole bond.

Three marks follow. An obligation binds determinate persons; it concerns a performance (an act, a forbearance, a payment); and it is enforceable by law, though in the case of imperfect obligations only indirectly (Section 6). When the performance is rendered, the obligation is discharged and the chain falls away.

2. The Roman Classification

Gaius, in his Institutes (second century), taught that every obligation arises either from contract or from delict (wrong). The two-fold scheme could not accommodate obligations such as the duty to repay money paid by mistake, so a later text attributed to Gaius added a third, residual class: obligations arising from various other causes. Justinian's Institutes (533) refined this into a fourfold classification, which remained the model of the civil law world.

The Romans also knew natural obligations (obligationes naturales), which could not be sued upon but, if performed, could not be recovered as a payment not due. They are the ancestors of Salmond's imperfect obligations.

3. Salmond's Sources of Obligation

Salmond classifies obligations by their source into four classes. The first three correspond to the familiar English categories; the fourth is a residual category Salmond called innominate, because it has no general name of its own.

A simple test sorts any obligation. Did the parties agree to it? It is contractual. Did it arise from a wrong? It is delictal. Did it arise from an unjust benefit with no agreement and no wrong? It is quasi-contractual. None of these? It is innominate. Note that some textbooks list 'statute' and 'trust' as separate sources alongside contract and tort; in Salmond's own scheme both fall under innominate obligations.

The classes can overlap on the same facts. A surgeon who operates negligently on a paying patient breaks a contractual obligation and also commits a tort; a trustee who misapplies funds may be liable both as trustee and for money had and received. The plaintiff may then choose the cause of action that suits him best, for example because of a longer limitation period, though he cannot recover twice for the same loss. The classification tells us where an obligation comes from, not that it can come from only one place.

4. Quasi-Contract and Unjust Enrichment

The modern basis of quasi-contract is the principle against unjust enrichment. Its classic statement is Lord Mansfield's in Moses v Macferlan (1760), an action for money had and received: the gist of such an action is that the defendant, upon the circumstances of the case, is obliged by the ties of natural justice and equity to refund the money. The old fiction of an implied promise has given way to the recognition that the law itself imposes the obligation.

The Indian Contract Act, 1872 deals with these obligations in Chapter V, 'Of certain relations resembling those created by contract', in Sections 68 to 72: a person who supplies necessaries to one incapable of contracting may be reimbursed from that person's property (s.68); a person interested in the payment of money which another is bound to pay, who pays it, is entitled to be reimbursed (s.69); a person who lawfully does something for another, not intending to do so gratuitously, where the other enjoys the benefit, must be compensated (s.70); a finder of goods has the responsibilities of a bailee (s.71); and money paid or a thing delivered by mistake or under coercion must be repaid or returned (s.72).

5. Solidary Obligations

Where there are several debtors (or creditors) under one obligation, the obligation is called solidary, and the law must decide how the burden is shared. Salmond distinguishes three forms. In a several obligation each debtor is bound only for his own share, as if there were separate obligations. In a joint obligation the debtors are bound together as one, and must be sued together. In a joint and several obligation the creditor may sue all of them together or any one of them for the whole, leaving the one who pays to recover contributions from the others.

Indian law leans toward joint and several liability. Under Section 43 of the Contract Act, where two or more persons make a joint promise, the promisee may, in the absence of express agreement to the contrary, compel any one or more of the joint promisors to perform the whole promise; the promisor who performs may claim contribution from the others. Under Section 44 the release of one joint promisor does not discharge the others. In tort, joint tortfeasors are liable jointly and severally for the whole damage. The same pattern appears in liability for wrongs (see Note 34).

6. Other Classifications: Primary and Secondary, Perfect and Imperfect

A primary obligation exists for its own sake, independently of any wrong: the obligation to deliver goods under a contract of sale. A secondary or sanctioning obligation arises from the breach of a primary one: the obligation to pay damages for breach. Contractual and quasi-contractual obligations are usually primary; delictal obligations are secondary by nature.

A perfect obligation is one the law will enforce by action. An imperfect obligation is recognised by law but not directly enforceable. The standard example is a time-barred debt. Section 3 of the Limitation Act, 1963 bars the remedy, not the right: the debt still exists. So if the debtor pays, he cannot recover the payment; under Section 25(3) of the Contract Act a written and signed promise to pay a time-barred debt is a valid contract; and under Section 60 a creditor may appropriate an unappropriated payment to a time-barred debt. The exception is Section 27 of the Limitation Act, which extinguishes the right itself when the period for a suit for possession of property expires (see Note 36). Salmond called the time-barred debt an imperfect legal right, not a mere moral right.

7. Obligation, Duty and Liability

These three ideas are constantly confused. Every obligation contains a duty, but not every duty is an obligation: the duty not to assault, owed to all the world, is not an obligation in Salmond's sense, because it corresponds to a right in rem, not in personam. Liability, on the other hand, is what follows when a duty or obligation is broken: it is the bond between the wrongdoer and the remedy (Salmond: see Note 34). Obligation looks forward to performance; liability looks back to the breach.

8. How Obligations End

Because an obligation is a chain, the law must also say how the chain is broken. Roman law listed the modes: solutio (payment or performance), novatio (replacing the old obligation with a new one), acceptilatio (a formal release), confusio (merger, where debtor and creditor become the same person) and compensatio (set-off of mutual debts). The Indian Contract Act covers the same ground for contractual obligations. An obligation is discharged by performance (Section 37); by agreement, through novation, rescission or alteration (Section 62); by remission, where the promisee dispenses with or remits performance or accepts less (Section 63); by impossibility or frustration (Section 56); and by breach, which replaces the primary obligation with a secondary obligation to pay compensation (Section 73). Lapse of time does not, as a rule, discharge the obligation: it leaves an imperfect obligation behind (Section 6).

The modes of discharge are themselves vestitive facts in Salmond's sense: they are the extinctive facts that bring the creditor's right to an end (see Note 36). Payment is the natural end of the chain; release, novation and merger are agreed or technical ends; breach is the pathological end, turning an obligation to perform into a liability to compensate.

9. Evaluation

The civil law world treats the law of obligations as one field, from which contract, delict and unjust enrichment grow as branches. The common law, and Indian law with it, grew these branches separately, which is why the Contract Act, the law of torts and the law of trusts sit in different compartments. Salmond's analysis shows their common root: each is a bond between determinate persons, differing only in the fact that creates it. His innominate class is honest about the limits of classification: some obligations simply do not fit a named box.

10. Frequently Asked Questions

Q. What is an obligation in jurisprudence?
A. A legal bond (vinculum juris) by which one determinate person is bound to render a performance to another. Salmond defines it as a proprietary right in personam or the duty corresponding to it. Justinian defined it as a legal bond by which we are bound to render something according to the laws of our State.

Q. What are innominate obligations?
A. Salmond's residual class of obligations that are neither contractual, delictal nor quasi-contractual. The main examples are a trustee's obligations to the beneficiary and obligations imposed directly by statute.

Q. Is quasi-contract really a contract?
A. No. There is no agreement. The law imposes the obligation to prevent unjust enrichment, and the name only reflects the old fiction of an implied promise. B.K. Mondal (1962) recognised Section 70 claims even where the contract was void for want of the form required by Art. 299.

See also: Note 28 (rights and duties), Note 34 (liability), Note 36 (title), Note 76 (rights in rem and in personam).