Acceptance — Communication, Modes, Revocation

Acceptance is the second half of the chain of formation. Section 2(b) of the Indian Contract Act, 1872 puts it in a single line: 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. Everything in this chapter — the absolute-and-unqualified rule of Section 7, the modes prescribed in Sections 3 and 8, the completion timetable in Section 4, the revocation window in Section 5 — is doctrinal scaffolding around that one transformation. Until acceptance is communicated, an offer is a bare invitation that the offeror may withdraw at will. Once communicated, the two minds become one and a contract is born.

Because the chapter sits in the formation chain just after offer and proposal and just before the doctrine of consideration, the entire architecture of contract formation under the Indian Contract Act turns on getting acceptance right. The chapter also feeds into the essentials of a valid contract in Section 10. Two examiners' favourites — the postal rule and the instantaneous-communication rule — are decided here.

Statutory anchor

Five sections govern acceptance directly. Read them as a single scheme rather than as standalone provisions.

Section 2(b) defines, Section 3 supplies the elastic test for what counts as communication, Section 4 fixes the completion timetable, Section 5 marks the revocation cut-off, Section 7 lays down the two qualitative requirements, and Section 8 carves out acceptance by performance for unilateral and conduct-based offers. The exam never tests one in isolation.

Essentials of a valid acceptance

Distil the scheme into seven essentials. A bench-style answer should march through these in order.

1. Absolute and unqualified — Section 7(1). Any deviation from the offer's terms is a counter-offer, not an acceptance.
2. Communicated to the offeror — flowing from Section 2(b) and confirmed by Section 4. Mental assent never suffices.
3. By the prescribed mode, or by a usual and reasonable mode if no mode is prescribed — Section 7(2).
4. Within the time fixed by the proposal, or within a reasonable time if no time is fixed — Section 6(2).
5. While the offer is still open — not lapsed under Section 6 and not revoked under Section 5.
6. By the offeree alone, or his duly authorised agent — flowing from the doctrine that an offer is addressed to a defined person or class.
7. With knowledge of the offer — settled by Lalman v. G. Dutt (1913) 11 ALJ 489.

Each essential maps to a distinct examiner trap. The first three are tested through fact-patterns; the last four through MCQ wording on lapse, revocation and counter-offer.

The mirror-image rule

An acceptance must mirror the offer exactly. If it changes a term, adds a condition, or carves out an exception, it operates as a rejection of the original offer plus a fresh counter-offer. The original offer is extinguished and cannot be revived by a later attempt to accept on the original terms.

The classical authority is Hyde v. Wrench (1840) 49 ER 132 — Wrench offered to sell at £1,000, Hyde counter-offered £950, then attempted to close at £1,000. No contract; the original offer had been extinguished. The qualification comes from Stevenson v. McLean (1880) 5 QBD 346 — a mere inquiry seeking clarification ('please wire whether you would accept forty for delivery over two months, or if not, longest limit you would give') is not a counter-offer and leaves the original offer intact.

The Indian gloss appears in Haridwar Singh v. Bagun Sumbrui AIR 1972 SC 1242. A bidder who revised his auction bid was held to have extinguished the original bid; the higher revised bid was a fresh offer. Practice tip: when a fact-pattern shows two communications from the offeree, ask whether the second is an inquiry or a fresh offer. The same logic governs lawful object and consideration when an acceptance proposes a term that would render the bargain unlawful under Section 23.

Provisional acceptance

An acceptance qualified by 'subject to' or 'we shall confirm later' is not an acceptance at all. It neither concludes a contract nor extinguishes the offer. It merely keeps the offer open, awaiting a definitive response. Dresser Rand S.A. v. Bindal Agro Chem Ltd. AIR 2006 SC 871 settles the position for letters of intent — a letter of intent is ordinarily a provisional acceptance, not a binding contract, unless its language unambiguously evidences contractual intention. Winn v. Bull (1877) 7 Ch D 29 makes the same point for an agreement expressly stated to be 'subject to the preparation and approval of a formal contract'.

Communication of acceptance

Section 3 is the test. Communication is anything done by any act or omission of the accepting party that is intended to communicate, or that has the effect of communicating, the acceptance. The phrasing is wide enough to cover words, conduct, signed documents, electronic transmissions and, in the case of unilateral contracts, performance of the prescribed condition.

Three rules govern communication.

First, mental assent does not bind. Decision in the offeree's own mind is not communication. The offer is converted into a promise only when the offeree manifests assent in a way that reaches, or is calculated to reach, the offeror.

Second, communication must be addressed to the offeror or his authorised agent. A communication directed to a stranger is no acceptance — even if the stranger relays it to the offeror, the offeree's act has not been done with intent to communicate.

Third, silence is not acceptance. The offeror cannot stipulate that silence shall be treated as assent. Felthouse v. Bindley (1862) 142 ER 1037 is the founding authority. Felthouse wrote to his nephew, 'If I hear no more about him, I consider the horse mine at £30 15s.' The nephew said nothing but intended internally to accept. The court held there was no contract, because the nephew had not communicated assent. The Indian Supreme Court applied the same principle in Life Insurance Corporation of India v. Raja Vasireddy Komallavalli Kamba AIR 1984 SC 1014 — mere receipt and retention of an insurance premium until after the proposer's death does not amount to acceptance of the proposal; communication is essential.

Acceptance by conduct

Section 8 carves out acceptance by performance. Where the offer invites acceptance by an act, doing the act is acceptance. Two situations arise.

The first is the unilateral-contract case — Carlill v. Carbolic Smoke Ball Co. (1893) 1 QB 256 and Harbhajan Lal v. Harchandra Lal AIR 1925 All 539. In each, the offer is a public reward; performance of the prescribed condition is itself acceptance, with no need for prior notification. The Indian variant is the lost-boy reward case in Harbhajan Lal, where the finder produced the boy and was held to have accepted by performance.

The second is acceptance by conduct in a bilateral exchange. Brogden v. Metropolitan Railway Co. (1877) 2 App Cas 666 — a draft contract returned with the word 'approved' but never signed was held accepted when the parties acted on it for years. The Indian Supreme Court applied the same logic in Bhagwati Prasad Pawan Kumar v. Union of India (2006) 5 SCC 311. The Railways had offered a partial settlement of a goods-loss claim with the stipulation that retention or encashment of the cheque would amount to acceptance in full and final satisfaction. The claimant encashed the cheque without prior protest. Held: by encashing without reservation, the claimant accepted the offer in the prescribed mode under Section 8 and could not later resile.

Lalman — knowledge of the offer

An act done in ignorance of the offer is not acceptance. Lalman v. G. Dutt (1913) 11 ALJ 489 is the textbook illustration. Lalman, the munim, was sent by his employer to look for a missing nephew. After Lalman left, the employer issued handbills offering Rs. 501 to anyone who found the boy. Lalman traced the boy and brought him home, then sued for the reward when he later learned of it. The Allahabad High Court refused: an acceptance presupposes knowledge of the offer; one cannot accept what one does not know exists.

Modes of acceptance

Section 7(2) gives the offeror the first say. If the proposal prescribes a manner — by post, by fax, in writing, by signed acknowledgement — the acceptance must be in that manner. If the offeror waives the prescribed manner by acting on a deviating acceptance, the deviation is treated as cured. If the offeror does not waive but objects within a reasonable time, the deviating acceptance is no acceptance at all. Silence on the part of the offeror after a deviating acceptance, however, amounts to waiver.

The English authority is Manchester Diocesan Council for Education v. Commercial and General Investments Ltd. (1969) 3 All ER 1593 — where a mode is prescribed but not in terms exclusive, an acceptance communicated by an equally advantageous mode binds the parties. The Indian gloss accepts the same principle: where the prescribed mode (say, fax) is intended to communicate in writing and to expedite, an emailed scan or a fax both serve the purpose; only an explicit insistence on a single mode confines the offeree.

Where no mode is prescribed, Section 7(2) requires acceptance 'in some usual and reasonable manner'. Reasonableness is a function of the offer's mode. A telephoned offer invites a telephoned acceptance; an emailed offer invites an emailed acceptance. The onus of objecting to a deviation lies on the offeror. The treatment of click-wrap and browse-wrap acceptances under e-contracts and standard form contracts applies the same usual-and-reasonable standard to digital channels.

Time and place of acceptance — Section 4

Section 4 splits the completion of communication of acceptance into two halves. As against the proposer, communication is complete when the acceptance is put in a course of transmission to him, so as to be out of the power of the acceptor. As against the acceptor, communication is complete when it comes to the knowledge of the proposer.

The bifurcation has practical bite. The proposer is bound the moment the acceptor posts the letter; even if the letter is lost in transit, the proposer cannot escape. The acceptor, by contrast, is bound only when the letter actually reaches the proposer. Until then, he may revoke the acceptance under Section 5. The asymmetry is deliberate — it protects the proposer from a fictional acceptance that never reached him, while protecting the acceptor from being bound by an act over which he has lost control.

The postal rule

The common-law origin is Adams v. Lindsell (1818) 106 ER 250 and Dunlop v. Higgins (1848) 9 ER 805 — a contract by post is concluded the moment the acceptance letter is posted, even if it never reaches the offeror. The Indian variant in Section 4 adopts this only for the proposer's side; the acceptor's side requires actual receipt. The combined effect: an Indian acceptor who posts and then changes his mind may revoke by a faster channel that overtakes the letter, provided the revocation reaches the proposer before or at the same time as the original acceptance.

Instantaneous communication

The postal rule does not extend to telephone, telex, fax or any other instantaneous channel. The leading English case is Entores Ltd. v. Miles Far East Corporation (1955) 2 All ER 493, per Lord Denning — when communication is interactive and substantially simultaneous, the contract is made when and where the acceptance is received. The House of Lords confirmed this in Brinkibon Ltd. v. Stahag Stahl (1982) 1 All ER 293.

The Supreme Court adopted the Entores rule for India in Bhagwandas Goverdhandas Kedia v. M/s. Girdharlal Parshottamdas & Co. AIR 1966 SC 543. A buyer in Ahmedabad spoke to a seller in Khamgaon by telephone; the seller orally accepted on the line. Disputes over jurisdiction turned on the place of formation. The majority held that the postal rule, being a deliberate exception based on commercial expediency, did not extend to telephonic communication; the contract was made at Ahmedabad, where the buyer (offeror) heard the acceptance. Hidayatullah J's dissent would have applied the Section 4 'course of transmission' phrase uniformly. The majority view governs.

Email occupies a contested middle ground. Most Indian writing treats email as more akin to a letter delivered to the addressee than to an interactive call, and applies the postal-rule analogue under Section 4. A safe formulation: the postal rule applies wherever the channel is non-interactive; the Entores rule applies wherever the channel is interactive and substantially simultaneous.

Revocation of acceptance — Section 5

The acceptor's revocation window is the gap between posting and arrival. As against the acceptor, communication is complete only when the proposer receives it (Section 4). Until that moment, the acceptor may revoke under Section 5. A revocation by faster channel that reaches the proposer before or simultaneously with the acceptance letter is effective. A revocation that arrives after the letter is too late.

The proposer's mirror right is also in Section 5: he may revoke the proposal until the communication of acceptance is complete as against him — that is, until the acceptance is put in a course of transmission. The instant the acceptor drops the letter into the post-box, the proposer's revocation window closes.

The Supreme Court summarised the principle in Bank of India v. O.P. Swarnakar AIR 2003 SC 858: an offer may be revoked at any time before acceptance, and an offer is made irrevocable by acceptance. A bare promise to keep an offer open is not enforceable unless supported by separate consideration — the rule of contract law, not contract drafting. This is one of the points where the chapter overlaps with the law of capacity to contract, since a revocation by an incompetent party is treated differently from a revocation by an adult of sound mind.

Tender, earnest money and the revocation question

Most government tenders require an earnest-money deposit and stipulate that withdrawal of the bid before acceptance forfeits the deposit. Three positions emerge from the case-law. The Andhra Pradesh High Court in Krishnaveni Constructions v. Executive Engineer, Panchayat Raj, Darsi AIR 1995 AP 362 held that an agreement not to revoke a bid, unsupported by consideration, is invalid; forfeiture is unenforceable. The Madhya Pradesh High Court in Sharad Trading Co. v. State of M.P. AIR 1980 MP 91 found enforceable consideration where the obligation arose from an existing contract's renewal clause. The Supreme Court in National Highway Authority of India v. M/s Ganga Enterprises AIR 2003 SC 3823 upheld forfeiture on broader grounds — the right to forfeit flows from the agreement governing the bid security, and that agreement is not nullified merely because the underlying offer was revoked. The position is reinforced in State of Haryana v. M/s. Malik Traders AIR 2011 SC 3574: forfeiture of bid security does not affect the statutory right of revocation under Section 5; the two operate on different planes.

The exam-angle: distinguish (a) the offeror's statutory right to revoke under Section 5, which cannot be contracted away by a bare clause, from (b) a collateral agreement on bid security, which is enforceable on its own terms. The forfeiture clause itself is read against the rules on liquidated damages and penalty in Section 74.

Acceptance by performance — Section 8 cases

Section 8 deserves a separate look because it disposes of two recurring fact-patterns.

Reward cases. The offer is to the world; performance of the prescribed condition is acceptance; no prior notification is required. Carlill and Harbhajan Lal are the canonical examples. The trap: performance done without knowledge of the offer is no acceptance — Lalman remains the answer.

Conduct cases. Where the offer invites acceptance by conduct (encashing a cheque, accepting goods, signing and returning a copy), the conduct, if unequivocal, is acceptance. The qualification, from Bhagwati Prasad Pawan Kumar, is that conduct must be done with the intention — actual or apparent — of accepting; if the offeree's conduct is accompanied by protest or reservation, the conduct does not amount to acceptance. Section 8 also overlaps with the law of quasi-contracts when the offeree retains a benefit without contractual intention, and with the rules on performance and tender of performance when the conduct itself discharges the bargain.

Distinguish from cognate provisions

Three distinctions are constantly tested.

Acceptance vs counter-offer. An acceptance mirrors; a counter-offer alters terms and extinguishes the original. Test: would the legal positions of the parties differ if the new term were performed? If yes, it is a counter-offer. The same logic feeds into the law of anticipatory breach when one party purports to alter the bargain after formation.

Acceptance vs provisional acceptance. An acceptance is unconditional; a provisional acceptance is qualified by a condition the offeree controls. The test is the language of qualification ('subject to', 'pending', 'we shall confirm'). A provisional acceptance does not bind, but unlike a counter-offer, it does not extinguish the offer either.

Acceptance vs invitation to treat. The fact-pattern is usually flipped — what looks like an offer is actually an invitation to treat. Pharmaceutical Society of Great Britain v. Boots Cash Chemists (1953) 1 QB 401 and the auction-puff cases recur. The rule: where the act invites further negotiation rather than concluding the bargain, no acceptance can attach to it. The point is sharpened in the chapter on landmark contract cases, which collects the leading invitation-to-treat decisions.

Practice angle — what plaintiff must prove

To plead a concluded contract on the foundation of acceptance, the plaintiff carries four burdens.

1. The fact of acceptance — pleaded as an averment of communication, with date, mode, and addressee.
2. That the acceptance was absolute and unqualified — produce the acceptance document or the communication record.
3. That the acceptance was within the time and by the mode prescribed — produce the proposal and any related correspondence.
4. That the acceptance was put in a course of transmission (for the proposer's side under Section 4) — postal receipts, server logs, telephone bills, courier acknowledgements.

The burden is reversed where the defendant pleads provisional acceptance, counter-offer, or revocation. A pleading that treats acceptance as a question of internal assent will not survive a Section 4 examination. Trial-court judges look for the timestamp.

Exam-angle distinctions

Five MCQ-recurrent points.

• An offer made to a definite class can be accepted only by a member of that class; one outside the class accepts nothing. The corollary: an offer to the world (a reward) can be accepted by anyone with knowledge of it.
• Cross-offers — identical offers crossing in transit — do not form a contract because neither party intended his communication as acceptance of the other. (Tinn v. Hoffman (1873) 29 LT 271.)
• Acceptance must be communicated by the offeree or his authorised agent; communication by a stranger is no acceptance even if the stranger acts in good faith. (Powell v. Lee (1908) 99 LT 284.)
• An acceptance subject to a condition that the offeree controls is provisional; an acceptance subject to a condition that lies outside the offeree's control may be a contingent acceptance, governed by the contingent-contract rules under Sections 31 to 36.
• The postal rule applies to the proposer alone under Section 4 of the Indian Contract Act — not symmetrically to both parties as in English common law. The acceptor remains free to revoke until the proposer actually receives the acceptance.

For a related set of questions on when an offer ceases to exist independently of acceptance, work through the chapter on communication, revocation and lapse of an offer. For the wider discharge framework that begins where formation ends, the discharge of contract chapter sets out the four modes of discharge, of which performance is the first.

Summary

Acceptance is the decisive step in the formation chain. Section 2(b) defines it; Section 7 demands it be absolute, unqualified, and in the prescribed manner; Section 3 lets it be inferred from any act or omission intended to communicate; Section 4 separates the proposer's and acceptor's timetables; Section 5 marks the revocation cut-offs on each side; Section 8 carves out acceptance by performance for unilateral and conduct-based offers. The case law is a compact set: Lalman for knowledge, Felthouse for silence, Hyde and Stevenson for the mirror-image rule, Brogden and Bhagwati Prasad for acceptance by conduct, Adams v. Lindsell and the postal rule, Entores and Kedia for instantaneous communication, Ganga Enterprises for tender forfeiture. The chapter then hands off to the third essential of a valid contract: the rule that every promise be supported by lawful and real value.

Frequently asked questions

Can silence ever amount to acceptance under the Indian Contract Act?

No. The settled rule from Felthouse v. Bindley (1862) 142 ER 1037, applied in India in Life Insurance Corporation of India v. Raja Vasireddy Komallavalli Kamba AIR 1984 SC 1014, is that silence is not acceptance. The offeror cannot prescribe that silence shall bind the offeree, because acceptance under Section 2(b) requires that the offeree signify his assent. Mere mental acceptance, mere retention of an offer document, or mere receipt and retention of a premium cheque without further act does not conclude a contract. The narrow exception is acceptance by conduct under Section 8, where the offer expressly invites a particular performance and the offeree performs.

Does the postal rule apply equally to both parties under Section 4?

No. Section 4 of the Indian Contract Act creates an asymmetric rule. As against the proposer, communication of acceptance is complete the moment the acceptor puts the letter into the course of transmission — even if the letter is lost. As against the acceptor, communication is complete only when the letter actually reaches the proposer. The asymmetry has a practical consequence: the acceptor may revoke his acceptance under Section 5 by a faster channel that overtakes the letter. The proposer enjoys no such window once the acceptor has posted. The English postal rule binds both parties from the moment of posting; the Indian rule does not.

Where is a contract concluded when the parties speak by telephone?

At the place where the offeror hears the acceptance. The Supreme Court in Bhagwandas Goverdhandas Kedia v. M/s. Girdharlal Parshottamdas & Co. AIR 1966 SC 543 held that the postal-rule exception in Section 4 does not extend to telephone, telex or other instantaneous channels. Following Lord Denning's reasoning in Entores Ltd. v. Miles Far East Corporation (1955) 2 All ER 493, the Court held that for instantaneous communication the contract is made when and where the acceptance is received. So a Mumbai-based buyer who hears a Delhi-based seller's acceptance over the phone has concluded the contract in Mumbai. The same principle now extends to video calls and live-chat acceptance.

Is a letter of intent a binding contract or only a provisional acceptance?

Ordinarily a letter of intent is only a provisional acceptance and not a binding contract. The Supreme Court in Dresser Rand S.A. v. Bindal Agro Chem Ltd. AIR 2006 SC 871 held that a letter of intent merely indicates a party's intention to enter into a contract in the future; it does not, by itself, conclude one. The question is one of construction: if the language unequivocally evidences contractual intention — for instance, where the parties have acted on the document for a long period or expended substantial sums — the court may treat the letter of intent as an acceptance. But the default reading is that it is a step preceding the formal contract, not the contract itself.

Can a bidder withdraw a tender before its acceptance despite a no-revocation clause?

Yes, the statutory right under Section 5 to revoke a proposal at any time before the communication of its acceptance is complete cannot be contracted away by a bare clause. State of Haryana v. M/s. Malik Traders AIR 2011 SC 3574 confirms that Section 5 operates regardless of the tender conditions. However, the bidder's right to revoke does not nullify a separate, validly made agreement on the consequences of revocation. The Supreme Court in National Highway Authority of India v. M/s Ganga Enterprises AIR 2003 SC 3823 upheld forfeiture of earnest money even after a valid revocation, treating the forfeiture clause as a collateral agreement enforceable on its own terms.