Offer and Acceptance in Contract Law, Explained (2026)

What are offer and acceptance in contract law? Offer and acceptance are the two steps that form the heart of almost every contract. An offer is a clear proposal by one party to be bound on stated terms. Acceptance is the other party's unqualified agreement to those exact terms. When a valid offer meets a valid acceptance, and the other ingredients of a contract are present, the parties have a binding agreement. In most legal systems a contract needs more than offer and acceptance. It usually needs an intention to create legal relations, something of value exchanged (called consideration in common-law systems such as India, the UK, Singapore and the US), capacity to contract, and a lawful purpose. Offer and acceptance are what create the "meeting of minds", the point at which the parties agree. This article is general guidance, not legal advice. Contract formation rules vary by jurisdiction, so check the law that applies to your situation. ## What makes a valid offer? An offer must be clear, complete enough to be acted on, and made with the intention of being bound if accepted. A few distinctions matter: - Offer vs invitation to treat. Displaying goods in a shop, advertising a product, or listing an item online is usually an "invitation to treat", not an offer. It invites others to make an offer, which the seller can then accept or reject. This is why a shop is not forced to sell at a mispriced tag.

• Offer to a specific person vs the world. An offer can be made to one person or to the whole world. The classic example is the English case Carlill v Carbonic Smoke Ball Co (1893), where a public promise to pay anyone who used a product and still caught flu was held to be a genuine offer that could be accepted by performance.
• Certainty. An offer too vague to act on is not a valid offer. The key terms, such as price, quantity and subject matter, need to be clear or capable of being made clear. ## What makes a valid acceptance? Acceptance must be an unqualified agreement to the terms of the offer, communicated to the offeror. Several rules follow from this: - The mirror-image rule. Acceptance must match the offer. If the response changes the terms, it is not an acceptance but a counter-offer, which rejects the original offer and puts a new one on the table. Under Indian law, Section 7 of the Indian Contract Act, 1872 requires acceptance to be absolute and unqualified.
• Communication is usually required. Silence is generally not acceptance. The offeree must communicate acceptance, though acceptance by conduct (such as shipping the goods) can count where the offer invites it.
• The method of acceptance. If the offer specifies how to accept, that method should be followed.
• The postal rule and electronic acceptance. In common-law systems, acceptance by post can take effect when the letter is posted, not when it arrives (the "postal rule"). For instant communication such as email and messaging, acceptance usually takes effect when and where it is received. In India, Sections 4 and 5 of the Contract Act set out when communication is complete and when an offer or acceptance can be revoked. ## How is a contract formed, step by step? 1. One party makes a clear offer on definite terms.

2. The offer is communicated to the other party.
3. The other party accepts the exact terms and communicates that acceptance.
4. Consideration passes, or is promised, between the parties (in common-law systems).
5. The parties intend to be legally bound and have the capacity to contract, for a lawful purpose. When all five are present, a binding contract exists, even if nothing is signed and nothing is written, for most everyday contracts. Writing and signature are proof and, for some contracts, a legal requirement, but they are not what creates the agreement. ## Revocation, lapse and counter-offers - Revocation. An offer can usually be withdrawn any time before it is accepted, as long as the withdrawal is communicated to the offeree. Under Section 5 of the Indian Contract Act, an offer may be revoked before acceptance is complete as against the offeror.

• Counter-offer kills the original. A counter-offer rejects the original offer, which cannot then be accepted unless renewed. The English case Hyde v Wrench (1840) is the classic illustration.
• Lapse. An offer lapses if it is not accepted within the time stated, or within a reasonable time if none is stated, or if a condition attached to it fails, or if either party dies or loses capacity in some cases.
• Option contracts. If the offeree pays or gives something to keep the offer open, the offeror may be bound not to revoke it for that period. ## Worked example A supplier emails a buyer: "We will supply 500 units at 100 rupees each, delivery in 30 days, this offer open for 7 days." That is a clear offer. If the buyer replies "Agreed", that is acceptance, and a contract forms on those terms. If the buyer instead replies "We accept at 90 rupees each", that is a counter-offer. The original offer is gone, and the supplier is now free to accept or reject the buyer's new terms. If the supplier says nothing and the buyer hears nothing back, there is no contract, because silence is not acceptance. ## A note on jurisdiction The core ideas of offer and acceptance are shared across common-law systems, but the detail varies. In India, the Indian Contract Act, 1872 codifies the rules, including that acceptance must be absolute and unqualified (Section 7) and the timing of communication and revocation (Sections 4 and 5). England, Singapore, Australia and other common-law countries follow case law with similar principles but local differences, including on the postal rule and electronic contracting. The United States uses the common law for services and the Uniform Commercial Code for the sale of goods, which relaxes the strict mirror-image rule in some business-to-business dealings. Civil-law countries, such as much of continental Europe, treat formation differently again and do not require consideration. Always check the governing law and any statute on electronic contracts. Last verified October 2026. ## Where a contract workspace helps Understanding offer and acceptance tells you when you are bound. The practical work is keeping track of where each deal sits: which offers are open, which have been accepted, which replies were really counter-offers, and what terms were finally agreed, across many conversations and documents. Drafting, reviewing, tracking and governing those deals can live in one AI workspace tuned to how your company contracts, so every draft and version sits together, the change between an offer and a counter-offer is visible, terms can be edited in plain language, and offer deadlines stay in view. Adira is one tool built this way, with drafting and tracking in a single workspace. This explanation alone is enough to understand how contracts form; a workspace just keeps drafting, review and tracking one connected job.