Offer and Acceptance
The two foundational acts of forming a contract - one party offers, the other accepts.
While straightforward in theory, many businesses fail to actively track obligations tied to this concept - often resulting in missed deadlines, unintended renewals, penalties, or loss of contractual rights.
US Law · For business owners and foundersWhat is a Offer and Acceptance?
Offer and acceptance are the two acts that create a binding contract. An offer is a definite proposal to enter a contract on specified terms. Acceptance is an unconditional agreement to all the terms of that offer. When both occur, and consideration is present, a contract is formed.
These rules sound simple but produce real disputes. Negotiations involve back-and-forth proposals that may or may not constitute formal offers. A response that changes even one term is a counteroffer - not an acceptance - and rejects the original offer. Understanding exactly when a binding contract is formed is critical because it determines which terms govern and whether either party can walk away.
In practice, many teams rely on a contract expiry tracking system to stay on top of dates and obligations tied to clauses like this.
Key Elements
What Makes a Valid Offer
An offer must be: (1) communicated to the offeree, (2) made with the intent to be bound, and (3) definite enough that an acceptance creates an enforceable agreement. Price lists, advertisements, and catalogs are generally invitations to make an offer - not offers themselves - because they do not express intent to be bound to every potential buyer.The Mirror Image Rule
Under common law, acceptance must match the offer exactly. Any addition, modification, or condition in the response is a counteroffer - which rejects the original offer and puts the ball back in the original offeror's court. This rule applies to real estate, service contracts, and employment agreements.UCC Battle of the Forms (Section 2-207)
For sales of goods, the UCC relaxes the mirror image rule. A response that accepts the offer but adds new terms can still be a valid acceptance - the additional terms become proposals for inclusion in the contract. Between merchants, additional terms that do not materially alter the contract automatically become part of it unless the offeror objects.The Mailbox Rule
Acceptance is effective the moment it is sent - not when received - as long as the method of communication is reasonable. So if you mail an acceptance and the offeror tries to revoke the offer after your letter is in the mail but before it arrives, the contract is already formed. Email acceptance is generally effective upon sending.Revocation Before Acceptance
An offer can be revoked any time before acceptance. Two key exceptions: (1) option contracts - where the offeree paid to keep the offer open - and (2) firm offers under UCC Section 2-205, where a merchant's signed written offer to buy or sell goods is irrevocable for up to 90 days.Real-World Example
Bolt Hardware sends a purchase order to SteelSupply for 500 units of a specific bracket at $12 each, delivery by March 1. SteelSupply responds with an order acknowledgment for the same quantity and price, but adds: "Delivery by March 15. No liability for delays caused by supplier shortages." Bolt does not respond and both sides proceed with the order.
Under the common law mirror image rule, SteelSupply's response is a counteroffer - it changed the delivery date and added a liability limitation. Bolt never formally accepted the counteroffer. Under UCC Section 2-207 (which applies here because this is a sale of goods), the response may still be an acceptance, with the additional terms treated as proposals. The delivery date change is a material term - it likely does not auto-incorporate. The result is a contract for 500 units at $12, but the delivery date and liability limitation are disputed. Proceeding without resolving this ambiguity is a common and costly mistake.
This is why many businesses adopt automated deadline tracking to ensure no critical dates are missed before they pass.
Sample Clause Language
Order Acceptance Clause (vendor terms)Watch Out For
Starting performance before confirming agreed terms
Beginning work or shipping goods after exchanging documents with differing terms - without resolving the differences - creates an implied contract under terms that may be disputed. Clarify all terms before performance starts.The "battle of the forms" in commercial dealings
When buyers use their own purchase order forms and sellers use their own order acknowledgment forms, the terms often conflict. Under the UCC, the resulting contract may contain a patchwork of terms from both documents. Know your standard terms and object promptly to conflicting terms in the other side's documents.Verbal acceptances with no paper trail
A verbal "yes" to an offer can form a binding contract. Without written confirmation, disputes about what was agreed are hard to resolve. Always follow verbal acceptances with a written confirmation of the agreed terms.Don't let offer and acceptance deadlines catch you off guard
Key dates tied to offer and acceptances - renewal windows, expiry cutoffs, notice periods - can easily slip through the cracks when tracked manually. Missing them triggers automatic extensions, penalties, or lost rights. ExpiryEdge tracks every critical deadline and sends automated reminders before they're due - so nothing slips.
Instead of relying on spreadsheets or manual follow-ups, a centralized renewal reminder system ensures every deadline is visible, tracked, and actioned automatically.
How to Use This in Your Favor
Include an acceptance clause in your standard terms
State expressly how your offers must be accepted - by countersignature, by written order confirmation, or by commencement of performance. This eliminates ambiguity about when a binding contract is formed and on whose terms.Object promptly to conflicting terms in purchase orders or acknowledgments
When you receive a document with terms that differ from yours, object in writing immediately. Silence or proceeding without objection can be read as acceptance of the other side's terms under the UCC.Frequently Asked Questions
Can silence constitute acceptance of an offer?
Generally no. A party cannot be bound to a contract simply because they did not respond to an offer. Acceptance requires an affirmative act - written, verbal, or by conduct. There are narrow exceptions: if prior dealings established that silence signals acceptance, or if the offeree accepts the benefit of the offered services with an opportunity to reject them.
When is an offer considered received?
An offer is effective when it reaches the offeree - when they actually receive it. This is the reverse of the mailbox rule for acceptance. The asymmetry means offers are effective on receipt but acceptances are effective on dispatch.
What is a firm offer and how is it different from a regular offer?
A firm offer is a written, signed offer by a merchant to buy or sell goods that states it will remain open for a set period. Under UCC Section 2-205, it is irrevocable for that period (up to 90 days) even without consideration - unlike a regular offer, which can be revoked any time before acceptance.