Offer and Acceptance
Learning Objectives
By the end of this page, you will be able to:
- Define a valid offer and distinguish it from an invitation to treat using Indian and US case law
- Identify the rules governing acceptance — unconditional assent, communication, and the mirror-image rule
- Explain the mailbox rule (US) and compare it with India's communication rule
- Apply revocation rules to determine when an offer can validly be withdrawn before acceptance
- Analyse counter-offers and how they extinguish the original offer
- Compare how UCC Article 2's Battle of the Forms differs from the strict common law approach
- Identify when an advertisement or catalogue constitutes an offer versus a mere invitation to deal
Quick Answer
An offer is a definite, communicated expression of willingness to be legally bound on specific terms. Acceptance is the unconditional assent to every term of the offer. Together they form an agreement — the first building block of a contract. Under the Indian Contract Act, 1872, acceptance is complete when communicated to the offeror; under US common law, the mailbox rule makes acceptance effective the moment it is dispatched. A counter-offer kills the original offer. Offers can be revoked any time before acceptance, but revocation must be communicated. Advertisements are generally invitations to treat, not offers, under both Indian and US law.
Introduction
Offer and acceptance are fundamental concepts in contract law, forming the basis of contract formation. This chapter explores the principles of offer and acceptance under the Indian Contract Act, 1872, and their US counterparts, showing how they apply in practical scenarios.
Definition of Offer
An offer (called a "proposal" in Indian law) is defined under Section 2(a) of the Indian Contract Act, 1872 as the expression of willingness by one person to another to do or abstain from doing something, with a view to obtaining the assent of that other person.
Key rules:
- An offer must be clear and certain — vague proposals cannot be accepted
- It must be communicated to the offeree — an unknown offer cannot be accepted
- The offeror must intend legal commitment — casual remarks are not offers
- An offer may be made to a specific person or to the world at large (unilateral offer)
Invitation to treat vs. offer: A shop display, price list, or advertisement is generally an invitation to treat — it invites the customer to make an offer that the seller can then accept or reject. This protects sellers from being forced to sell unlimited quantities at advertised prices.
Definition of Acceptance
Acceptance is defined under Section 2(b) of the Indian Contract Act, 1872 as the signification of assent to the terms of a proposal. When acceptance is given, the proposal becomes a "promise."
Key rules:
- Acceptance must be unconditional — any new term creates a counter-offer, not acceptance
- It must be communicated to the offeror (Section 4, ICA)
- Acceptance must follow the mode prescribed by the offeror, if any
- Silence is not acceptance — a party cannot be bound by saying nothing
- Acceptance must be made before the offer lapses or is revoked
Communication of Offer, Acceptance, and Revocation
India — Communication Rules (Section 4, ICA)
| Communication | Complete When |
|---|---|
| Offer | Comes to the knowledge of the offeree |
| Acceptance | Two stages: (1) against the acceptor — on dispatch; (2) against the offeror — when it reaches the offeror |
| Revocation of offer | When it comes to the knowledge of the offeree |
| Revocation of acceptance | When it comes to the knowledge of the offeror |
US — The Mailbox Rule
Under US common law, acceptance is effective at the moment of dispatch (posting, emailing, etc.), not on receipt. This favours the offeree. Revocation, however, is effective only on receipt. Therefore, if an offeree posts acceptance before receiving a revocation, a binding contract exists even though both cross in transit.
Revocation of Offer
An offer can be revoked any time before acceptance is communicated. Section 6 of the Indian Contract Act lists circumstances where an offer lapses:
- By revocation by the offeror before acceptance
- By lapse of time (if time is stipulated; otherwise, a reasonable time)
- By failure of a condition precedent
- By death or insanity of the offeror, if the offeree learns of it before accepting
Counter-Offer
A counter-offer is a reply to an offer that introduces new or different terms. It amounts to a rejection of the original offer and creates a new offer that the original offeror can now accept or reject. The original offer is extinguished and cannot be revived.
Example: A offers to sell a car for ₹5 lakhs. B replies "I will buy it for ₹4.5 lakhs." This is a counter-offer. A's original offer is dead. If A rejects, B cannot go back and accept the ₹5 lakh price.
Case Law Illustrations
Mistry v. Mehta [1969] 71 Bom.L.R. 727: The court held that a mere suggestion does not constitute an offer — there must be a clear intention to be legally bound. This case distinguishes between preliminary negotiations and binding offers.
Chinnaswamy Reddiar v. Sankara Aiyar AIR 1925 Mad 345: The Madras High Court ruled that where acceptance is not communicated to the offeror, no contract comes into existence. Communication is not merely internal — it must reach the offeror.
Carlill v. Carbolic Smoke Ball Co. [1892] 1 QB 256 (English — widely followed in India): An advertisement offering £100 to anyone who used a smoke ball and still contracted influenza was held a valid offer to the world at large. Mrs. Carlill's use of the ball was sufficient acceptance. This established the doctrine of the unilateral contract — an offer accepted by performance.
Lefkowitz v. Great Minneapolis Surplus Store (1957, US): A newspaper advertisement saying "First come, first served" with a specific quantity and price was held to be a valid offer, not merely an invitation to treat. This is a recognised US exception to the general advertisement rule.
Battle of the Forms — UCC Article 2 (US)
Under common law's mirror-image rule, acceptance must exactly match the offer. UCC § 2-207 (Battle of the Forms) changes this for goods contracts: a definite expression of acceptance forms a contract even if it includes additional or different terms. Those additional terms become part of the contract between merchants unless they materially alter the offer, the offer expressly limits acceptance, or the offeror objects within a reasonable time.
Key Terms
| Term | Definition | Related Concept |
|---|---|---|
| Offer/Proposal | Expression of willingness to be legally bound on specific terms — Section 2(a) ICA | Invitation to treat, Counter-offer |
| Acceptance | Unconditional signification of assent to all terms of an offer — Section 2(b) ICA | Mirror-image rule, UCC § 2-207 |
| Invitation to Treat | A pre-offer communication that invites offers; not itself an offer | Advertisement, Display of goods |
| Counter-offer | Response to an offer introducing new terms; extinguishes the original offer | Rejection, Hyde v. Wrench |
| Mailbox Rule | US rule: acceptance effective on dispatch, not on receipt | Revocation, Communication |
| Revocation | Withdrawal of an offer before acceptance; must be communicated to take effect | Section 6 ICA, Lapse |
| Unilateral Contract | Offer accepted by performance rather than a return promise | Carlill v. Carbolic Smoke Ball |
| Battle of the Forms | UCC § 2-207 rule allowing contract formation despite differing terms in acceptance | Mirror-image rule, Goods contracts |
Common Mistakes
Misconception: A counter-offer is a type of acceptance. Why it's wrong: A counter-offer is legally a rejection of the original offer and the creation of a brand-new offer. The original offer is destroyed — the original offeror can now accept or reject the counter-offer. If they reject, the counter-offeror cannot resurrect the original terms. Correct understanding: Any response that adds, changes, or qualifies the terms of an offer is a counter-offer, not an acceptance. Only an unconditional and unambiguous "yes to everything" constitutes valid acceptance.
Misconception: Silence can constitute acceptance if the parties have dealt with each other before. Why it's wrong: Both Indian and US law reject silence as acceptance as a general rule. The principle is that no one can be contractually bound without their positive assent. Even a prior course of dealing does not automatically make silence an acceptance of a new offer. Correct understanding: Acceptance requires a positive, communicated act of assent. Exceptions are very narrow — e.g., where the offeree themselves specified that their silence would mean acceptance. Even then, courts scrutinise such arrangements carefully.
Misconception: The mailbox rule applies everywhere in the US, including to revocations. Why it's wrong: The mailbox rule applies to acceptances only. Revocations are effective only on receipt — they follow the general communication rule. This asymmetry means a revocation posted the same day as an acceptance (but received after the acceptance is posted) does not prevent a contract from forming. Correct understanding: In the US, post your acceptance before you receive a revocation and you have a contract, even if the revocation was sent first.
Comparison and Connections
| Feature | India (ICA 1872) | US Common Law | UCC Article 2 |
|---|---|---|---|
| Acceptance effective when | Reaches offeror | Dispatched (mailbox rule) | Dispatched (mailbox rule) |
| Mirror-image rule | Yes — any deviation is counter-offer | Yes | No — Battle of the Forms |
| Revocation effective when | Communicated to offeree | Received by offeree | Received by offeree |
| Advertisement | Invitation to treat | Invitation to treat (Lefkowitz exception) | Invitation to treat |
| Silence as acceptance | No | No | No |
| Unilateral contract | Recognised (Carlill applied) | Recognised | Recognised |
Practice Questions
Recall
-
What are the rules under Section 4 of the Indian Contract Act for when acceptance becomes complete against the acceptor and against the offeror? Guidance: Against the acceptor — on dispatch (posting, sending). Against the offeror — when the acceptance reaches them. This two-stage rule is unique to Indian law and frequently tested.
-
List three circumstances under Section 6 of the Indian Contract Act under which an offer lapses. Guidance: (1) Revocation before acceptance, (2) lapse of time (stipulated or reasonable), (3) failure of a condition precedent, (4) death or insanity of offeror if known to offeree. Any three with brief explanation will suffice.
Understanding
-
Explain why a counter-offer extinguishes the original offer rather than merely suspending it. Guidance: Policy — if the original offer could be resurrected after a counter-offer is rejected, offerees could speculate on price movements: try to get a lower price, and if refused, snap up the original. The rule in Hyde v. Wrench (1840) prevents this by treating a counter-offer as a total rejection.
-
Why does US law treat acceptances as effective on dispatch (mailbox rule) while India requires communication to the offeror? Guidance: The mailbox rule protects offerees who have dispatched acceptance and may have begun relying on the contract. India's rule protects certainty — the offeror knows definitively when bound. Neither is inherently superior; both reflect a policy choice about who bears the risk of postal delay.
Application
-
Anya posts an offer to sell her flat to Bharat for ₹50 lakhs on 1 January. On 5 January, Anya posts a revocation. On 6 January, Bharat posts his acceptance. On 7 January, Bharat receives the revocation. On 8 January, Anya receives Bharat's acceptance. Is there a contract under Indian law? Guidance: Under Section 4 ICA, acceptance is complete against the offeror when it reaches Anya (8 January). Revocation is complete when it reaches Bharat (7 January). Since Bharat dispatched acceptance on 6 January (before receiving revocation on 7 January), acceptance was already in transit. Against the acceptor, acceptance was complete on 6 January. The key question is whether revocation was effective before acceptance — the revocation reached Bharat only after he had already dispatched acceptance. A contract was formed.
-
A US hardware store posts on its website: "Hammers — $12 each, while stock lasts." Carlos emails: "I accept — please ship me 500 hammers." Has a contract formed under US common law? Guidance: No. The website listing is an invitation to treat, not an offer. Carlos's email is the offer. The store has not yet accepted. Apply the Lefkowitz exception test — is there a specific quantity committed to a specific person? No — this is open to all comers. No contract until the store accepts Carlos's order.
Analysis
-
A company sends a purchase order (with its standard terms). The seller sends back an order acknowledgment (with different standard terms). Under UCC § 2-207, analyse whether a contract formed and whose terms govern. Guidance: A contract formed if the acknowledgment was a definite acceptance. The additional terms from the seller become proposals to modify — between merchants, they become part of the contract unless they materially alter the offer, the offer limited acceptance to its terms, or the offeror objects. Conflicting terms "knock out" each other and UCC gap-fillers substitute. This is the classic Battle of the Forms analysis.
-
Critically assess the rule that advertisements are invitations to treat rather than offers. Does this rule still make sense in the context of online "Buy Now" buttons? Guidance: Traditional justification — unlimited stock liability. But "Buy Now" buttons often have inventory control that prevents overselling. Some argue the button IS an offer once a specific price and product are displayed to a specific user. Courts have begun to look at context — is there a quantity limit? Is stock displayed? The analysis is evolving.
FAQ
1. Can an offer be made to the entire world? Yes. A unilateral offer can be made to the public at large, and anyone who performs the stipulated act accepts it. The classic example is Carlill v. Carbolic Smoke Ball Co. — the company offered a reward to anyone who used the ball and still fell ill. Indian courts have applied this principle. The offer is accepted by performance, not by a return promise, so the offeror is bound once someone begins performance in reliance on the offer.
2. What happens if the offeree accepts only part of the offer? Partial acceptance is treated as a counter-offer in most circumstances, not a valid acceptance. Acceptance must be of the entire offer. However, where an offer itself contemplates partial performance (such as a standing offer or a divisible contract), accepting part of it may be valid for that portion. Courts look carefully at whether the offeror intended the offer to be separable.
3. Can acceptance be revoked after it is dispatched? Under Indian law, Section 5 allows an acceptor to revoke acceptance any time before the communication of acceptance becomes complete as against the acceptor — i.e., before the acceptance reaches the offeror. So if you post an acceptance but the revocation reaches the offeror before the acceptance does, you have effectively revoked. Under US mailbox rule, once acceptance is dispatched the contract is formed, making revocation difficult.
4. Is an email offer valid, and when does acceptance of an email offer take effect? Yes, email offers are valid under the Information Technology Act, 2000 (India) and applicable US state law. Under India's IT Act (Section 13), an electronic record is dispatched when it leaves the sender's server and received when it enters the recipient's server. For contractual purposes, acceptance of an email offer takes effect when the acceptance email enters the offeror's server — consistent with the communication rule.
5. What is the difference between lapse of an offer and revocation of an offer? Revocation is an active, deliberate withdrawal by the offeror before acceptance. Lapse is the automatic expiry of an offer due to efflux of time, failure of a condition, or death of a party. The practical difference is that lapse requires no communication — the offer simply ceases to exist — whereas revocation must be actively communicated to the offeree before it is effective.
Quick Revision
- Offer = definite, communicated willingness to be bound on specific terms — Section 2(a) ICA
- Acceptance = unconditional assent to every term — Section 2(b) ICA
- Advertisement = invitation to treat, NOT an offer (Lefkowitz is the US exception)
- Counter-offer extinguishes the original offer — no going back
- India: acceptance complete against offeror when it reaches them
- US mailbox rule: acceptance effective on dispatch
- Revocation must be communicated before acceptance takes effect
- Silence is not acceptance — positive assent is required
- Carlill: advertisement can be a valid offer if sufficiently certain and addressed to the public
- UCC § 2-207: Battle of the Forms allows contract to form despite differing terms
- Under Section 6 ICA, offers lapse by revocation, time, death, or failure of condition
- Unilateral contract: accepted by performance, not promise
Related Topics
Prerequisites: Introduction to Contract Law, Formation of Contracts
Related Topics: Consideration, Free Consent, Capacity to Contract, Electronic Contracts
Next Topics: Consideration, Free Consent, Legal Objects