QUICK ANSWER

A contract forms when a valid offer is accepted exactly as made and the acceptance is communicated back to the offeror. Acceptance must match the offer exactly, called the mirror-image rule. Any change to the terms is a counteroffer, which rejects the original offer and creates a new one, so the original can no longer be accepted. An offer can also end by revocation, rejection, lapse of time, or death. In Texas, the contract's effective date is when the last party signs and communicates acceptance.

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This guide explains offer, counteroffer, and acceptance for the Texas sales agent exam. It is educational content, not legal advice. Contract formation is technical and depends on the facts and current law. Confirm the primary sources below and work under your broker before you rely on any point.

Mirror image
acceptance must match the offer exactly
Counteroffer
rejects the original and starts a new offer
Communicated
acceptance must reach the offeror to form a contract
Effective date
when the last party signs and communicates acceptance

Offer and acceptance is how a contract is born, and it is the practical heart of the Contracts and Agency area. This spoke builds on the contract law fundamentals spoke, which covers what makes a contract valid, and it is part of the Contracts and Agency area.

The exam tests this with quick logic scenarios: who can still accept, whether a counteroffer killed the original offer, and when a binding contract exists. Learn the mirror-image rule and how offers terminate, and these get easy. Let us build it.

What makes a valid offer?

Snippet answer: A valid offer is a proposal to enter a contract that shows a clear intent to be bound, states definite terms, and is communicated to the offeree. The person making the offer is the offeror, and the person receiving it is the offeree. Until the offer is accepted and that acceptance is communicated, no contract exists, and the offeror can generally revoke the offer.

Contract formation starts with an offer. An offer is a proposal to make a deal on specific terms, and it must show that the person genuinely intends to be bound if the other side agrees. Learn the two roles: the offeror makes the offer, and the offeree receives it.

A valid offer has three features. It shows intent to contract, not just idle talk. It states definite terms, like price and property. And it is communicated to the offeree, since you cannot accept an offer you never received. Until acceptance, no contract exists, so the offeror can usually take the offer back.

Acceptance and the mirror-image rule

Snippet answer: Acceptance is the offeree's unqualified agreement to the exact terms of the offer. Under the mirror-image rule, the acceptance must match the offer precisely. If the offeree changes any term, even a small one, it is not an acceptance but a counteroffer. Acceptance must also be communicated back to the offeror to form a binding contract, and for real estate it must be in writing.

Acceptance is where the deal comes together, but only if it is unqualified. The offeree must agree to the exact terms offered, with no changes. This is the mirror-image rule: the acceptance must mirror the offer.

The rule is strict. If the offeree agrees to everything except one term, say they accept but raise the price by a thousand dollars, that is not an acceptance. It is a counteroffer, which changes everything. Acceptance also has to be communicated back to the offeror, because a silent or private acceptance does not form a contract. And for real estate, the accepted agreement must be in writing to be enforceable, tied to the statute of frauds.

The counteroffer

Snippet answer: A counteroffer is a response that changes the terms of the offer. It does two things at once: it rejects the original offer, and it makes a new offer. Because the original offer is rejected, it is off the table and can no longer be accepted. The roles also reverse, so the original offeree becomes the new offeror. This is the most tested formation concept on the exam.

The counteroffer is the trap the exam loves, so understand exactly what it does. A counteroffer is any response that alters the terms rather than accepting them as offered. It has two effects at the same time.

First, it rejects the original offer. That offer is now dead, and the original offeree can no longer go back and accept it, even if they change their mind. Second, it becomes a brand-new offer on the changed terms. The roles flip: the party who made the counteroffer is now the offeror, and the other party is now the offeree who may accept, reject, or counter again. Remember that a counteroffer kills the original offer, so there is no going back to it.

How an offer terminates

Snippet answer: An offer can end several ways before acceptance. The offeree can reject it, or make a counteroffer, which is also a rejection. The offeror can revoke it any time before acceptance. The offer can lapse when its stated time expires or after a reasonable time. And it ends automatically if either party dies or becomes incapacitated, or if the property is destroyed. Once any of these happens, there is no offer left to accept.

An offer does not stay open forever, and the exam tests the ways it ends.

Termination event What happens
Rejection The offeree turns the offer down, ending it
Counteroffer A changed response that rejects and replaces the offer
Revocation The offeror withdraws the offer before acceptance
Lapse of time The stated deadline passes, or a reasonable time expires
Death or incapacity Either party dies or loses capacity before acceptance
Destruction of the property The subject property is destroyed

The key timing point is that revocation must happen before acceptance. Once the offeree has accepted and communicated it, a contract exists and the offeror can no longer revoke. Before that moment, the offeror is generally free to pull the offer.

The counteroffer-kills-the-original rule is a classic exam trap. Run the free contracts and agency question set to drill it.

When does a contract actually form?

Snippet answer: A contract forms at the moment a valid acceptance is communicated to the offeror. Agreement alone is not enough; the acceptance must be delivered back so the offeror knows the deal is on. Before that, no contract exists and the offer can be revoked. After that, both parties are bound. In real estate the accepted contract must also be in writing and signed.

Timing is everything, and the exam rewards knowing the exact moment a contract exists. A binding contract forms when the offeree accepts and that acceptance is communicated back to the offeror. Not when the offeree decides to accept privately, and not when they sign in secret, but when the acceptance is actually delivered to the offeror or their agent.

This matters for revocation. Before the acceptance is communicated, the offeror can still revoke. After it, the offer has ripened into a contract and cannot be withdrawn. For real estate, the contract must be written and signed, so a handshake or verbal yes does not create an enforceable sale. Once binding, the buyer gains an equitable interest in the property.

Offer and acceptance in a Texas deal

Snippet answer: In Texas, offers and acceptances usually run through TREC promulgated forms. The contract's effective date is the date the last party to sign communicates final acceptance to the other party. A seller has no legal duty to respond to an offer at all, and may accept, reject, counter, or ignore it. Counteroffers and changes are made in writing through the contract and amendment forms.

Texas handles offer and acceptance through the promulgated contract system. Buyers and sellers negotiate using TREC forms, and changes are documented in writing rather than by casual conversation. See the one-to-four family residential contract guide for the form itself.

Two Texas points matter for the exam. The effective date of a TREC contract is the date the final party to accept signs and communicates that acceptance to the other side, and it is the date deadlines count from. And a seller has no duty to respond to an offer in any particular way, so silence is not acceptance and not a required counter. Written documentation of every change keeps the mirror-image rule satisfied.

How to study offer and acceptance for the exam

Snippet answer: Study this topic as a timeline. An offer must show intent, definite terms, and communication. Acceptance must mirror the offer exactly and be communicated back to form a contract. A counteroffer rejects the original and starts fresh, so the original cannot be revived. An offer also ends by rejection, revocation before acceptance, lapse, death, or destruction of the property.

Walk any scenario down the timeline. Was there a valid offer? Was the response an exact acceptance or a change? If it changed anything, it was a counteroffer that killed the original. Was the acceptance communicated? Only then is there a contract.

Keep this spoke tied to its neighbors. The contract law fundamentals spoke covers the elements and statuses, the earnest money and option period spoke covers what happens after acceptance, and the Contracts and Agency hub ties the area together.

Frequently asked questions

What is the mirror-image rule? The mirror-image rule requires an acceptance to match the offer exactly. If the offeree agrees to every term without change, it is a valid acceptance. If they change any term, even a small one, the response is a counteroffer rather than an acceptance. This is why a real estate acceptance must adopt the offer's terms precisely to form a contract.

Can an offeree accept an offer after making a counteroffer? No. A counteroffer rejects the original offer, which takes it off the table permanently. Once rejected through a counteroffer, the original offer can no longer be accepted, even if the offeree changes their mind. The counteroffer becomes a new offer, and the parties negotiate from there.

When does a real estate contract actually form? A contract forms when a valid acceptance is communicated back to the offeror. Deciding to accept privately is not enough; the acceptance must be delivered so the offeror knows the deal is on. Before communication, the offeror can revoke the offer. For real estate, the accepted contract must also be in writing and signed to be enforceable.

Does a seller have to respond to an offer in Texas? No. A seller has no legal duty to respond to an offer in any particular way. The seller may accept it, reject it, make a counteroffer, or simply not respond. Silence is not acceptance. Any counteroffer or change should be made in writing through the appropriate TREC forms to keep the terms clear.

Practice questions

1. A buyer offers $300,000. The seller responds by agreeing to everything but raising the price to $310,000. This response is: A. A valid acceptance B. A counteroffer that rejects the original offer C. A binding contract at $300,000 D. An unenforceable offer

Answer: B. Changing any term makes the response a counteroffer, which rejects the original offer under the mirror-image rule. It is not an acceptance (A), no contract formed at the original price (C), and the counteroffer is a valid new offer, not unenforceable (D).

2. After a seller makes a counteroffer, the buyer decides they would rather accept the seller's original terms instead. Can they? A. Yes, the original offer is still open B. No, the counteroffer rejected and ended the original offer C. Yes, if within three days D. Only if the seller agrees in writing

Answer: B. A counteroffer rejects the original offer, so it is off the table and cannot be accepted later. The original is not still open (A), there is no three-day revival window (C), and while the seller could re-offer those terms, the buyer cannot simply accept the dead original (D).

3. When does a binding real estate contract form? A. When the offeree privately decides to accept B. When the offeror makes the offer C. When the acceptance is communicated back to the offeror D. When earnest money is deposited

Answer: C. A contract forms when a valid acceptance is communicated to the offeror. A private decision is not enough (A), the offer alone is not a contract (B), and earnest money is customary but not the moment of formation (D).

4. Before the offeree communicates acceptance, the offeror changes their mind and withdraws the offer. This is: A. Not allowed once an offer is made B. A valid revocation, because it occurred before acceptance C. A counteroffer D. A breach of contract

Answer: B. An offeror may revoke an offer any time before acceptance is communicated, so this is a valid revocation. Offers can be withdrawn before acceptance (A), withdrawing is not a counteroffer (C), and no contract existed yet, so there is no breach (D).

Sources and methodology

This guide was written from general contract-law principles and Texas sources, and reverified on July 21, 2026. It teaches the exam-level concepts, not legal advice.

  • The requirements of a valid offer, the mirror-image rule for acceptance, and the counteroffer's dual effect of rejecting and replacing an offer come from general contract law as applied to real estate.
  • The ways an offer terminates, including rejection, counteroffer, revocation before acceptance, lapse of time, death or incapacity, and destruction of the property, come from general contract law.
  • The rule that a contract forms when acceptance is communicated to the offeror comes from general contract law and Texas practice.
  • The Texas effective-date concept and the rule that a seller has no duty to respond to an offer come from the TREC promulgated contract forms and TREC guidance.

Verify all contract-formation rules against the current Texas sources and qualified counsel before you rely on them in practice.

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This article is exam-prep education for the Texas real estate sales agent license. It is not legal advice, and it does not create an agency relationship. Contract formation is technical and depends on the specific facts and current law. Always confirm the current Texas statutes and TREC forms and work under the supervision of your sponsoring broker before acting.