A counteroffer is a reply to an offer that changes its terms rather than accepting them as written. Making one has a legal consequence most people don’t realize: under common law, a counteroffer rejects the original offer. Once you counter, the first proposal is gone, and you can’t go back and accept it unless the other side puts it back on the table.
Any Change Turns Acceptance Into a Counter
The common law “mirror image rule” requires an acceptance to match the offer exactly. Any deviation, even a small one, turns the response into a counteroffer instead of an acceptance.1Cornell Law Institute. Mirror Image Rule A reply that says “I accept, but only if you also include…” is not an acceptance at all. The Restatement (Second) of Contracts puts it plainly: a reply that purports to accept an offer but conditions that acceptance on additional or different terms is a counteroffer.2Open Casebook. Restatement (Second) of Contracts 59 – Purported Acceptance Which Adds Qualifications
The rule cuts both ways. If you receive an offer and respond with any modification, you’ve made a counteroffer. If you send an offer and get back anything other than a clean “yes,” you’re looking at a counter, not a deal.
The Original Offer Ends the Moment You Counter
The Restatement (Second) of Contracts § 39 treats a counteroffer as having the same effect as a rejection.3Open Casebook. Restatement (Second) of Contracts 39 – Counter-Offers Section 36 lists rejection or counteroffer first among the ways the power to accept an offer ends.4Open Casebook. Restatement (Second) of Contracts 36 The original proposal is dead. Getting it back requires a fresh offer from the other side.
The Restatement’s own illustration makes the consequence concrete. A seller offers land for $5,000 and promises to hold the offer open for thirty days. The buyer responds with $4,800. The seller declines. The buyer then tries to accept the original $5,000 offer within the thirty-day window. No contract forms, because the $4,800 counteroffer already terminated the buyer’s power of acceptance.3Open Casebook. Restatement (Second) of Contracts 39 – Counter-Offers The thirty-day promise didn’t save it.
The same rule applies in employment negotiations. When a candidate counters a salary offer, that counter legally rejects the original package. Most employers treat this as ordinary hiring practice, but the employer has no obligation to keep the original numbers on the table. If the company decides the counter signals a bad fit, it can walk away entirely, and the candidate has no right to fall back on the first offer.
Asking a Question Is Not the Same as Countering
Not every response that mentions different terms is a counteroffer, and this is where people get tripped up. Asking whether the seller would consider a lower price is not the same as proposing a lower price. English contract law drew this line in an 1880 case where a party asked whether payment could be spread over two months. The court held the question was a mere inquiry, not a counteroffer, and the original offer remained open.
The difference is whether you’re proposing new terms or exploring them. “Would you consider $280,000?” is an inquiry. “I’ll pay $280,000” is a counteroffer that kills the original. If you want to test the waters without losing your fallback, frame the response as a question rather than a proposal. Experienced negotiators use this constantly, especially in real estate, where accidentally terminating the original offer can cost the deal.
The Option Contract Exception
One significant exception preserves the original offer even after a counter. When the offeree holds a paid option contract, making a counteroffer does not terminate the right to accept the original terms within the option period. Section 37 protects the option holder because the offeree paid consideration specifically for the right to decide within a set timeframe.3Open Casebook. Restatement (Second) of Contracts 39 – Counter-Offers
The practical effect: if you paid $5,000 for a 90-day option to purchase a commercial property at $2 million, you can propose $1.8 million without giving up your right to come back and exercise the option at $2 million before the 90 days run out. Without the paid option, that lower proposal would have destroyed your ability to accept the original price.
Sales of Goods Follow Different Rules
The mirror image rule governs service contracts, real estate transactions, and most other common-law agreements. Sales of goods are the major exception. Under UCC § 2-207, a response that clearly expresses acceptance can still form a contract even if it includes terms that differ from the original offer.5Cornell Law Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation The mirror image rule does not apply.1Cornell Law Institute. Mirror Image Rule
This matters because businesses buying and selling goods routinely trade forms with boilerplate that doesn’t line up perfectly. Under the old rule, each mismatched form would have been a counteroffer, and no contract would form until someone signed the other side’s exact document. The UCC treats additional terms as proposals to modify the contract. Between merchants, those additional terms automatically become part of the deal unless the original offer expressly limited acceptance to its own terms, the additions would materially change the deal, or the original offeror objects within a reasonable time.5Cornell Law Institute. Uniform Commercial Code 2-207 – Additional Terms in Acceptance or Confirmation
One limit is worth flagging. If the response says acceptance is expressly conditional on the other side agreeing to the new terms, it functions as a counteroffer rather than an acceptance, even under the UCC. “I accept, and here are some additional terms” is a contract with proposed additions. “I accept only if you agree to these additional terms” is a counter.
What a Valid Counteroffer Needs
A counteroffer has to be specific enough that the other party can accept it and form a binding contract. At minimum, identify the original offer by date and parties, then spell out exactly which terms you want changed. Vague language like “I’d want a better price” doesn’t qualify, because it lacks definite enough terms for the other side to accept.
In real estate, counteroffers commonly modify the purchase price, the closing date, contingencies (inspection, financing, appraisal), seller concessions on closing costs or repairs, or which items of personal property are included. For commercial goods, the changed terms usually involve unit price, quantity, delivery schedule, or warranty. Whatever the context, every number should be unambiguous. “$475,000” is clear. “Approximately mid-four hundreds” invites a fight.
Revoking a Counteroffer
A counteroffer, like any offer, can be pulled back at any point before the other side accepts. Section 42 provides that the power of acceptance ends when the offeree receives a clear indication that the offeror no longer intends to go through with the deal.6Open Casebook. Restatement (Second) of Contracts 42 – Revocation by Communication From Offeror Received by Offeree The word “revoke” is not required. Any communication that makes clear you’re no longer willing to proceed on those terms is enough.
The critical detail is timing. Revocation only takes effect when the other party actually receives it. If you mail a revocation on Monday but the other side accepts your counteroffer on Tuesday before your letter arrives, you may have a binding contract. Acceptances are generally effective when sent under the traditional mailbox rule, but revocations are only effective when received.6Open Casebook. Restatement (Second) of Contracts 42 – Revocation by Communication From Offeror Received by Offeree If you need to pull a counteroffer quickly, use the fastest delivery available and confirm receipt.
How Long a Counteroffer Stays Open
A counteroffer does not stay open forever. If it specifies a deadline for response, acceptance after that deadline has no legal effect. Real estate counters routinely include expiration times measured in hours or a handful of days, and a buyer who responds even slightly late may find the deal gone.
When no deadline is stated, the counteroffer remains open for a “reasonable time,” which depends on the circumstances. The type of transaction, the volatility of the subject matter, and the method of communication all factor in. An offer on publicly traded stock might lapse in hours. A counter on rural land might remain open for weeks. Courts look at what both parties would reasonably have understood in context.
Some counteroffers include a “time is of the essence” clause, which treats missing the deadline as a material breach. Under that language, the party who set the deadline can declare the counter void the moment the clock runs out, with no grace period and no obligation to extend.
Spelling: One Word
Modern American legal and professional writing uses “counteroffer” as a single closed word. The AP Stylebook directs that words formed with the “counter-” prefix are generally not hyphenated, and major legal references follow the same convention. “Counter-offer” and “counter offer” still appear in older contracts and in British English texts, but current American usage treats it as one word.