Definitions and Essentials of a Valid Contract (Section 2)

Section 2 of the Indian Contract Act, 1872 is the gateway to the entire statute. It supplies the definitions of every operative term the Act uses — proposal, promise, promisor, promisee, consideration, agreement, reciprocal promise, void agreement, voidable contract, and contract itself — and every later section speaks the vocabulary that Section 2 establishes. Section 10 then collects the conditions on which an agreement becomes a contract enforceable by law. Read together, Sections 2 and 10 contain everything a candidate needs to identify whether a given factual exchange has produced a contract, an unenforceable agreement, or no agreement at all.

This chapter takes the definitions clause-by-clause, explains how each definition links to the next, and sets out the seven essentials of a valid contract that flow from Section 10. It then identifies the four categories of agreements the Act uses — valid contracts, void agreements, voidable contracts, and unenforceable contracts — and shows the consequence of each category for the rights and remedies of the parties. The chapter sits at the start of our broader notes on the Indian Contract Act and supplies the vocabulary that every later chapter presupposes.

Statutory anchor — Section 2 ICA

Section 2 begins with a familiar formula: "In this Act, the following words and expressions are used in the following senses, unless a contrary intention appears from the context." The clause then runs through eleven sub-clauses, each defining a key term. The eleven definitions, in the order the Act gives them, are: proposal (sub-clause a), promise (b), promisor and promisee (c), consideration (d), agreement (e), reciprocal promises (f), void agreement (g), voidable contract (i), contract (h), void contract (j), and the gateway phrase "agreement enforceable by law is a contract". The order matters — each later definition presupposes the earlier ones. A promise is the acceptance of a proposal; an agreement is a promise supported by consideration; a contract is an agreement that the law will enforce.

The Act's choice to lead with definitions reflects its codifying purpose. Common-law contract law had developed each of these concepts piecemeal through decisions; the codifier's task was to fix the vocabulary at the start so that subsequent provisions could be read with precision.

Section 2(a) — Proposal

A proposal is defined as the signification by one person to another of his willingness to do or to abstain from doing anything, with a view to obtaining the assent of that other to the act or abstinence. Three elements stand out. First, the proposal is an act of signification — communication is essential, not merely intention to propose. Second, the willingness must be to do or to abstain from doing — both positive and negative undertakings can be the subject of a proposal. Third, the proposal must be made with a view to obtaining assent — the proposer must intend to be bound on acceptance.

The Act uses the word "proposal". The English common law uses the word "offer". The two are interchangeable in Indian practice. Section 2(a) is examined in detail in our chapter on offer and proposal — communication, revocation, lapse, which sets out the distinction between offer and invitation to treat, between specific and general offers, between offer and standing offer in tender cases, and the rules of revocation and lapse in Sections 5 and 6.

Section 2(b) — Promise

When the person to whom the proposal is made signifies his assent thereto, the proposal is said to be accepted; a proposal, when accepted, becomes a promise. Two key consequences follow. First, the moment of acceptance is the moment a promise comes into being — before acceptance there is only an outstanding proposal. Second, the existence of a promise does not by itself make a contract — that requires the further ingredient of consideration. A promise is the building block; an agreement is the structure built from promises and the consideration that supports them.

Section 2(c) — Promisor and Promisee

The person making the proposal is called the promisor, and the person accepting the proposal is called the promisee. The labels are functional, not relational — the same person may be promisor on one limb of a transaction and promisee on another. In a contract of sale, the seller is promisor as to delivery and promisee as to payment; the buyer is promisor as to payment and promisee as to delivery. The distinction matters when applying provisions that operate on the promisor or the promisee specifically — Section 37 on performance, Section 53 on prevention of performance by the promisee, Section 73 on damages payable to the aggrieved party.

Section 2(d) — Consideration

Section 2(d) is the most heavily litigated of the definitions. When at the desire of the promisor, the promisee or any other person has done or abstained from doing, or does or abstains from doing, or promises to do or to abstain from doing something, such act or abstinence or promise is called a consideration for the promise. Three propositions live in this dense formula.

First, the consideration must be at the desire of the promisor. An act done at the desire of a stranger to the contract, or an act done voluntarily without any request, is not consideration. The leading authority is the venerable Calcutta decision Durga Prasad v. Baldeo (1881) ILR 3 All 221, where money spent in building shops at the request of the District Collector was held not to be consideration for a subsequent promise by occupying merchants to pay a commission, because the construction was at the desire of the Collector, not at the desire of the merchants.

Second, the consideration may move from the promisee or any other person. This is the conscious Indian departure from the English common-law rule that consideration must move from the promisee. In India, a stranger to the consideration may furnish it. The classic Indian illustration is Chinnaya v. Ramayya (1881) ILR 4 Mad 137, where consideration furnished by a third party (the donor of property) was held sufficient to support a promise of annuity made by the donee to a person who had not herself furnished any consideration.

Third, the consideration may be past, present or future — an act already done at the promisor's desire, an act being done, or a promise of a future act. This too is a departure from English law, which treats past consideration as no consideration. Together with the third-party rule, this makes the Indian conception of consideration significantly broader than its English counterpart. The full architecture, with the Section 25 exceptions to the no-consideration-no-contract rule, is in our chapter on consideration.

Section 2(e) — Agreement

Every promise and every set of promises forming the consideration for each other is an agreement. The definition collapses two ideas: a promise (which itself requires offer plus acceptance) and consideration. An agreement is therefore the meeting of an accepted proposal with the consideration that supports it. The term covers bilateral exchanges (each party promising something to the other) and unilateral arrangements (one party promising in return for an act by the other). Agreement is the broader category; contract is the narrower one — every contract is an agreement, but not every agreement is a contract.

Section 2(f) — Reciprocal Promises

Promises which form the consideration or part of the consideration for each other are called reciprocal promises. The definition is technical and matters most for the performance and breach chapters. Section 51 deals with promisors not bound to perform unless reciprocal promisee ready and willing to perform; Section 52 with the order of performance of reciprocal promises; Section 54 with the consequences of one party failing to perform a reciprocal promise that the other was to perform first. The definition's significance is procedural — it identifies the cluster of promises that have to be performed in correlation, not in isolation.

Section 2(g) — Void Agreement

An agreement not enforceable by law is said to be void. The void agreement is a nullity from inception — it never produces a contract. Sections 24 to 30 catalogue the agreements the Act expressly declares void: agreements with persons incompetent to contract (Section 11 read with Section 2(g)); agreements made under bilateral mistake of fact essential to the agreement (Section 20); agreements without consideration (Section 25); agreements in restraint of marriage (Section 26); agreements in restraint of trade (Section 27); agreements in restraint of legal proceedings (Section 28); agreements with uncertain meaning (Section 29); agreements by way of wager (Section 30). Each of these categories is examined in our chapter on void agreements.

Section 2(h) — Contract

An agreement enforceable by law is a contract. Five words that lock the entire architecture into place. An agreement that satisfies the conditions of Section 10 is a contract; an agreement that fails any condition of Section 10 is not. The definition is the gateway to enforcement — only contracts give rise to rights enforceable in courts; mere agreements that fail Section 10 produce no enforceable rights at all.

Section 2(i) — Voidable Contract

An agreement which is enforceable by law at the option of one or more of the parties thereto, but not at the option of the other or others, is a voidable contract. The voidable contract is a real contract — it produces rights from inception — but those rights may be defeated by the party whose consent was vitiated, who may elect to rescind. The classic settings are coercion, undue influence, fraud and misrepresentation — vitiating factors examined in our chapter on free consent. Until rescinded, the voidable contract is binding and the rescinding party may be required by Section 64 to restore any benefit received under it.

Section 2(j) — Void Contract

A contract which ceases to be enforceable by law becomes void when it ceases to be enforceable. The void contract is the opposite-end-bookend of the void agreement. The void agreement was never enforceable; the void contract was once a valid contract that has subsequently ceased to be enforceable — typically by reason of supervening impossibility under Section 56, or by lapse of time, or by the destruction of the subject matter. The distinction is fine but consequential: the parties to a void contract had real obligations until the moment the contract became void, and Section 65 requires restoration of any advantage received.

Section 10 — Essentials of a valid contract

Section 10 is the operative gateway. "All agreements are contracts if they are made by the free consent of parties competent to contract, for a lawful consideration and with a lawful object, and are not hereby expressly declared to be void." The section thus enumerates four cumulative conditions which, when read with the definitional clauses of Section 2 and the further requirements scattered through the Act, yield seven essentials.

1. Offer and acceptance. There must be a lawful offer by one party and a lawful acceptance by the other. The offer-acceptance machinery of Sections 3 to 9 supplies the technical content.
2. Intention to create legal relations. Although not stated in the Act, the requirement is read into the agreement-contract relationship through judicial interpretation. Social, domestic and religious arrangements that are not intended to give rise to legal obligations do not produce contracts.
3. Lawful consideration. The consideration must satisfy the definition in Section 2(d) and must not fall within the prohibited categories of Section 23.
4. Capacity of parties. The parties must be competent to contract within the meaning of Section 11 — of the age of majority, of sound mind, and not disqualified from contracting by any law to which they are subject. The leading authority on the consequences of a minor's agreement is the Privy Council decision in the 1903 mortgage case from Calcutta, which held the agreement of a minor to be void ab initio rather than voidable. The full architecture is in our chapter on capacity to contract.
5. Free consent. Section 13 defines consent as agreement upon the same thing in the same sense — consensus ad idem. Section 14 then defines free consent as consent not caused by coercion, undue influence, fraud, misrepresentation or mistake. Where consent exists but is not free, the contract is voidable; where consent itself is absent, no agreement is formed at all.
6. Lawful object. The object of the agreement must not be unlawful within the meaning of Section 23 — not forbidden by law, not of such a nature as to defeat any law, not fraudulent, not involving injury to person or property, not immoral, and not opposed to public policy. The full doctrine is examined in our chapter on lawful object and consideration.
7. Not expressly declared void. The agreement must not fall within any of the categories of Sections 24 to 30 that the Act expressly declares void.

Section 10 also adds two qualifications by way of proviso. Nothing in the section affects any law in force in India by which any contract is required to be in writing or in the presence of witnesses, or any law relating to the registration of documents. The general rule under the Act is therefore that an oral contract is enforceable if it satisfies Section 10; writing and registration are required only where some other statute so directs.

Consensus ad idem and the role of Section 13

Section 13 defines consent: "Two or more persons are said to consent when they agree upon the same thing in the same sense." This is the principle of consensus ad idem. The Supreme Court in K. Nanjappa v. R.A. Hameed, AIR 2015 SC 3389, observed that although even an oral contract is enforceable, a heavy burden lies on the plaintiff to prove the existence of consensus ad idem between the parties for a concluded and binding agreement. Where the parties' minds did not in fact meet — where each had a different subject in mind, or attached a different meaning to the same words — there is no agreement at all. This is distinct from the case of vitiated consent under Section 14, where consent exists but is not free.

Leading authorities on the definitional architecture

Several decisions illustrate the way Section 2 and Section 10 are applied together to identify whether a given exchange has produced a contract.

The 1903 Privy Council decision on the mortgage executed by a Hindu minor in Calcutta — reported at (1903) ILR 30 Cal 539 — held that the agreement of a minor is not merely voidable but void ab initio. The reasoning rests on Section 11 read with Section 2(g): a person not competent to contract cannot make an agreement that the law will enforce, and an agreement not enforceable by law is by Section 2(g) a void agreement. The decision has been the foundation of every subsequent decision on minor's contracts.

Balfour v. Balfour, [1919] 2 KB 571, although an English decision, is regularly invoked to read the requirement of intention to create legal relations into Indian law. A husband's promise to pay his wife a monthly allowance during separation was held unenforceable for want of intention. Indian courts have applied the same reasoning to social and family arrangements, treating the intention to create legal relations as a condition of contract even though Section 10 does not name it.

Aloka Bose v. Parmatma Devi, AIR 2009 SC 1527, on agreements of sale, held that an agreement of sale need not be signed by both vendor and purchaser to be valid — exchange of communications, oral acceptance, or acceptance by conduct is sufficient. The decision is a useful illustration of the proposition that Section 10 contemplates substance over form: a valid contract requires offer, acceptance, consideration, capacity, free consent and lawful object — not any particular formality, unless some other statute imposes one.

Bharat Fire and General Insurance Ltd. v. Parameshwari Prasad Gupta, AIR 1968 Delhi 68, on the interpretation of contracts, held that where the language of a contract is susceptible of two interpretations, the courts may resort to surrounding circumstances to find out the intention of the parties. The case is part of the line of authority on the cardinal rule that a contract must be construed as a whole, in its commercial context, with extrinsic evidence admitted only to the limited extent permitted by the proviso to Section 92 of the Indian Evidence Act.

Distinguishing the four categories of agreements

The vocabulary of Section 2 yields four categories that the candidate must keep distinct.

A valid contract is an agreement that satisfies all the essentials of Section 10. It produces rights enforceable in courts. The standard remedy on breach is damages under Sections 73 to 75, with specific performance available under the Specific Relief Act in appropriate cases.

A void agreement, by Section 2(g), is an agreement not enforceable by law from the start. It produces no rights at all. The categories are Sections 24 to 30 and Section 11.

A voidable contract, by Section 2(i), is enforceable at the option of one party and not the other. Until the option to rescind is exercised, the contract is binding. On rescission, Section 64 requires restoration of benefits received.

A void contract, by Section 2(j), is one that has ceased to be enforceable. It was once a valid contract; supervening events — typically supervening impossibility under Section 56 — have stripped it of enforceability. Section 65 requires restoration of advantages received.

The unenforceable contract is a fifth category not separately defined in Section 2 but recognised in practice — a contract that satisfies Section 10 but cannot be enforced because of a procedural bar (limitation, want of stamp, want of registration). The contract exists; only the remedy is barred.

Standard of proof of a contract

An oral contract is as enforceable as a written one, but the burden of proof on the party asserting it is heavier. The Supreme Court in K. Nanjappa emphasised that a plaintiff who pleads an oral contract must establish consensus ad idem on each material term. Where the contract is reduced to writing, Section 91 of the Indian Evidence Act bars evidence of any oral agreement that varies the written terms; Section 92 admits extrinsic evidence only in the narrow categories of its provisos.

Where the contract is partly oral and partly written — the so-called composite contract — the court reads the documentary terms with such oral incidents as the parties have proved by admissible evidence. The principle was applied by the Supreme Court in the line of cases beginning with the 1981 decision on novation and the operation of conduct-based acceptance.

Exam-angle takeaways

For objective and short-answer questions, the candidate should fix four propositions in memory.

First, the order of definitions in Section 2 mirrors the logical sequence of contract formation: proposal → acceptance → promise → consideration → agreement → contract. Each later term presupposes the earlier ones.

Second, Section 10 enumerates only four conditions in its text — free consent, capacity, lawful consideration and object, and absence of express declaration of voidness. The full count of seven essentials is reached by adding offer-and-acceptance (from Section 2(a) and 2(b)), intention to create legal relations (read in by judicial interpretation), and certainty (Section 29).

Third, the four categories of agreements — valid, void, voidable, void contract — are defined in Section 2 and have distinct legal consequences. Confusing void agreement (never a contract) with void contract (was once a contract, no longer enforceable) is a recurring examination error.

Fourth, the Indian definition of consideration in Section 2(d) is broader than the English. Past consideration is good consideration; consideration may move from a third party. These are conscious departures and any answer that simply restates the English position will lose marks.

The chapters that follow build on this definitional foundation. Acceptance is examined in our chapter on acceptance — communication, modes, revocation; the doctrines of frustration and supervening impossibility in our chapter on the doctrine of frustration under Section 56; the consequences of breach in our chapter on breach of contract — anticipatory and actual; the rules on damages and liquidated sums in our chapter on damages — Hadley v Baxendale, liquidated damages, penalty; and the residuary obligations under Sections 68 to 72 in our chapter on quasi-contracts. Returning periodically to the vocabulary of Section 2 keeps the architecture intact through each of these later treatments.

Frequently asked questions

What is the difference between an agreement and a contract under Section 2 of the Indian Contract Act?

Section 2(e) defines an agreement as every promise and every set of promises forming the consideration for each other. Section 2(h) defines a contract as an agreement enforceable by law. Every contract is therefore an agreement, but not every agreement is a contract. An agreement becomes a contract only on satisfying Section 10 — free consent of parties competent to contract, lawful consideration, lawful object, and not being expressly declared void. The distinction is the doctrinal foundation of the entire Act, because rights and remedies flow only from contracts, not from agreements that fail Section 10.

Is consensus ad idem the same as free consent?

No. Consensus ad idem is defined in Section 13 — two persons consent when they agree upon the same thing in the same sense. It is the requirement that the parties' minds meet on the subject and terms of the agreement. Free consent is defined in Section 14 — consent not caused by coercion, undue influence, fraud, misrepresentation or mistake. Where consensus ad idem is absent there is no agreement at all; where consent exists but is not free, the contract is voidable at the option of the party whose consent was vitiated. The Supreme Court in K. Nanjappa v. R.A. Hameed (2015) emphasised that proving consensus ad idem on each material term is a heavy burden in oral contract suits.

What is the difference between a void agreement and a void contract?

A void agreement under Section 2(g) is an agreement that the law will not enforce from inception — it never produces a contract. The categories are Sections 11 (incompetence), 20 (bilateral mistake), and 24 to 30 (specific void categories). A void contract under Section 2(j) is a contract that has ceased to be enforceable — it was once a valid contract that produced binding rights, but supervening events have stripped it of enforceability. The standard cause is supervening impossibility under Section 56. Section 65 requires restitution of advantages received under an agreement that becomes void.

Does the Indian Contract Act require contracts to be in writing?

No. The general rule under Section 10 is that an oral contract is as enforceable as a written one if it satisfies the four cumulative conditions of free consent, capacity, lawful consideration and object, and absence of express declaration of voidness. The proviso to Section 10 preserves any other law that requires writing or registration — for example, the Transfer of Property Act on sales of immovable property over a hundred rupees, or the Indian Stamp Act on instruments. The Supreme Court has repeatedly held that the burden of proving an oral contract is heavier, but the contract itself is not invalid for want of writing.

What are the seven essentials of a valid contract under the Indian Contract Act?

Section 10 names four conditions in its operative text — free consent, capacity, lawful consideration and object, and absence of express declaration of voidness. The full count of seven is reached by adding offer and acceptance from Section 2(a) and 2(b), intention to create legal relations read in by judicial interpretation, and certainty under Section 29. The seven together are: (1) offer and acceptance, (2) intention to create legal relations, (3) lawful consideration, (4) capacity of parties, (5) free consent, (6) lawful object, and (7) the agreement must not be expressly declared void. All seven must be satisfied for an agreement to ripen into an enforceable contract.