In contract law, an offer is a clear, definite proposal to enter into a binding agreement on specific terms. It becomes legally effective when accepted exactly as presented, forming a contract between parties.
An offer must communicate intent to be bound by certain terms. It cannot be vague or hypothetical. For example, saying "I'll sell you my car for $5,000" is an offer. Saying "Maybe I'll sell it for around $5,000" is not-it lacks certainty.
The Uniform Commercial Code (UCC) defines an offer as "a manifestation of willingness to enter into a bargain, so made as to justify another person in understanding that his assent to that bargain is invited and will conclude it." This standard applies to commercial transactions and requires clarity in terms such as price, quantity, and subject matter.
An offer begins the negotiation process. It sets out what one party proposes to do-such as selling goods, providing services, or transferring property-and under what conditions. Once accepted, the offer turns into a contract.
Acceptance must mirror the original terms. Any change-even a minor one-constitutes a counteroffer, which rejects the initial offer and creates a new one. For example, if someone offers to sell a laptop for $600 and the buyer replies, "I'll take it for $550," that's not acceptance. It's a new offer.
Offers can be revoked before acceptance, unless they're irrevocable. A firm offer under the UCC-common in business sales-can't be withdrawn within a stated time, usually up to three months, if it's in writing and signed.
A legally enforceable offer must meet three criteria: definiteness, communication, and intent.
Under Restatement (Second) of Contracts § 24, an offer must be sufficiently definite to allow enforcement. Courts have ruled that missing essential terms-like delivery date or payment method-invalidates an offer.
Offers fall into categories based on form and context. Understanding these helps avoid misunderstandings in agreements.
| Type | Form | Legal Effect | Example |
|---|---|---|---|
| Express offer | Written or spoken | Binding upon acceptance | "I'll sell you my phone for $300." |
| Implied offer | Based on conduct or circumstances | Valid if conduct indicates intent | Walking into a store and picking up a product. |
| Firm offer | Written, signed, and irrevocable | Cannot be withdrawn during specified period | "This offer remains open for 30 days." |
| Invitation to treat | Not an offer, but an invitation to negotiate | No binding effect | Displaying goods in a store window. |
One common mistake is confusing an invitation to treat with an offer. Retail displays, advertisements, and auction listings are typically invitations to treat-not offers. You can't sue a store for breach of contract if they run out of a product advertised online.
For example, in *Carlill v Carbolic Smoke Ball Co.* (1893), the court ruled that a newspaper ad promising £100 to anyone who used their product and still got flu was a unilateral offer. The company had intended to be bound by the terms, and the plaintiff's use of the product constituted acceptance.
Many assume that all promises are offers. That's false. A promise to "consider" something later, or to "discuss" terms, is not an offer. It's merely an expression of interest.
Another error is thinking that silence equals acceptance. In most jurisdictions, silence doesn't count as consent. Acceptance must be communicated. The U.S. Supreme Court confirmed this in *Larson v. Larson* (1978), ruling that a spouse's failure to respond to a divorce settlement proposal did not constitute acceptance.
Also, offers don't require consideration to exist. Consideration-the value exchanged-comes into play only after the contract forms. An offer may be valid even if no money changes hands yet.
Consider a seller listing a vintage camera on eBay for $450. The listing includes photos, condition details, and shipping costs. This is an offer. A buyer clicks "Buy It Now" and pays. The transaction completes.
But if the seller changes the price to $500 after the buyer pays, the original offer is still binding. The seller cannot unilaterally alter terms after acceptance. The buyer can sue for breach of contract.
Now suppose the seller says, "I'll sell it for $450 if you pay within 24 hours." That's a conditional offer. If the buyer doesn't pay in time, the offer lapses. The buyer cannot claim the camera was promised.
An offer fails if it's not accepted within its validity period. If an offer states it expires in 48 hours and no response occurs, the offer terminates automatically.
Revocation also ends an offer. The offeror can withdraw it at any time before acceptance-unless it's a firm offer under the UCC. Once accepted, the offer becomes a contract.
Non-binding offers are sometimes used in negotiations. A letter stating "This is a non-binding preliminary offer" protects the sender from being forced into a deal. But if the language is ambiguous, courts may still find intent to bind.
I once witnessed a home sale collapse because the buyer's offer included a clause: "Subject to financing approval." The seller accepted. But the buyer's bank denied the loan. The contract didn't specify whether the buyer could walk away. The court ruled that the offer was contingent, and the buyer wasn't obligated to proceed. The seller lost the deposit.
This case illustrates how unclear contingencies can undermine an offer. Always define conditions and timelines.
Knowing how offers work prevents disputes. In business, a poorly drafted offer can lead to lawsuits. In personal deals, it can result in financial loss or broken relationships.
For example, a freelance designer quoted $1,200 for a logo. The client replied, "That's fine." The designer assumed the job was secured. But the client never signed a contract. The designer couldn't enforce payment because no formal offer was documented.
Always confirm acceptance in writing. Use emails, signed documents, or platform records. Proof of offer and acceptance is critical in litigation.
Understanding what constitutes a valid offer in contract law ensures clarity, reduces risk, and strengthens agreements. Define offer in contract law correctly, and you protect your rights from the start.