Contract Law Fundamentals for the Texas Exam

Contracts are the backbone of the Contracts and Agency area, because almost every real estate transaction is a contract. This spoke covers the fundamentals: what makes a contract valid, the four status labels, and the ways contracts are classified. It is part of the Contracts and Agency area.

The exam tests this topic with definitions and quick scenarios. Learn the essential elements, the four statuses, and the bilateral-versus-unilateral split, and most questions become easy. Let us build it.

What makes a contract valid?

Snippet answer: A valid contract needs five things: competent parties with legal capacity, mutual agreement through offer and acceptance, consideration meaning an exchange of value, a legal purpose, and, for real estate, a written form. Miss an essential element and the contract is not valid. These elements are what the exam checks when it asks whether an enforceable contract exists.

A contract is a legally enforceable agreement, and it needs a specific set of ingredients. Learn the five essential elements.

The first four apply to contracts generally. The fifth is the real estate twist: because of the statute of frauds, a contract for the sale of real estate must be in writing to be enforced. Miss any element and the agreement fails to be a valid, enforceable contract.

Valid, void, voidable, and unenforceable

Snippet answer: Every contract falls into one of four statuses. Valid means it has all essential elements and is binding and enforceable. Void means it never had legal effect, often because it lacked an essential element like a legal purpose. Voidable means it is valid but one party has the right to cancel it. Unenforceable means it may be valid but a court will not enforce it, often because it is not in writing.

These four labels are the most tested part of the topic, so keep them straight.

Think of them as a spectrum of enforceability. A valid contract binds both parties. A void contract binds no one, because it was never a real contract. A voidable contract binds the parties unless the protected party cancels it. An unenforceable contract exists but cannot be enforced in court. The two the exam confuses most are void and voidable, so take them next.

Void versus voidable

Snippet answer: Void and voidable sound alike but are opposites in effect. A void contract has no legal force at all, usually because it lacks an essential element, such as an illegal purpose or a party with no capacity. A voidable contract is valid and enforceable unless the disadvantaged party chooses to cancel it. Contracts made by a minor, or induced by fraud, duress, misrepresentation, or undue influence, are voidable, not void.

The difference is who can walk away. A void contract binds no one because it was never valid. A contract to do something illegal is void, and so is a contract with a party who had no legal capacity. There is nothing to enforce.

A voidable contract is fully valid and binding, but one party, the disadvantaged one, has the option to cancel it. The classic examples are a contract signed by a minor, or a contract a party was tricked or pressured into through fraud, duress, misrepresentation, or undue influence. The injured party may enforce it or void it. A contract with an unmet contingency is also voidable by the protected party. Remember void equals dead on arrival, while voidable equals cancelable by one side.

Unenforceable and the statute of frauds

Snippet answer: An unenforceable contract may be valid between the parties but cannot be enforced in court. The most tested reason in real estate is the statute of frauds, which requires that a contract for the sale of real estate be in writing. An oral agreement to sell land may be valid while both parties honor it, but a court will not enforce it. An expired statute of limitations can also make a contract unenforceable.

Unenforceable is the subtle status. The contract may have all its elements, but the law will not let a court enforce it. In real estate, the leading reason is the statute of frauds.

The statute of frauds requires certain contracts, including any contract for the sale of real estate, to be in writing. An oral deal to sell a house might hold together while both sides cooperate, but if one side backs out, the other cannot force performance in court. That is why real estate contracts are written. See the addenda and statute of frauds guide for the Texas detail. A contract can also become unenforceable when the statute of limitations, the deadline to sue, has passed.

Bilateral versus unilateral contracts

Snippet answer: A bilateral contract is a promise for a promise: both parties are obligated, each promising to perform. Most real estate sales contracts are bilateral, since the buyer promises to buy and the seller promises to sell. A unilateral contract is a promise for an act: only one party is obligated unless and until the other performs. An option contract and a reward are classic unilateral examples.

Contracts are classified by how the obligations run. In a bilateral contract, both sides make promises, so both are bound from the start. A standard purchase agreement is bilateral: the buyer promises to pay and the seller promises to convey. Each promise is the consideration for the other.

In a unilateral contract, only one party is bound at first. One side makes a promise, and the other is free to act or not. The promisor becomes obligated only if the other party performs. An option contract fits here: the seller is bound to keep the offer open, but the buyer is not obligated to buy. A reward offer is another example, since no one must act, but performing earns the reward. For the exam, bilateral is a promise for a promise, and unilateral is a promise for an act.

Express, implied, executed, and executory

Snippet answer: Contracts are also classed by how they form and how far they have progressed. An express contract states its terms, orally or in writing. An implied contract is formed by the conduct of the parties. An executed contract is fully performed, with nothing left to do. An executory contract is still in progress, with obligations unfinished, like a signed purchase contract that has not yet closed.

Two more pairs round out the vocabulary. The first pair is about how the contract is formed. An express contract has terms that are stated, either spoken or written. An implied contract arises from the parties' conduct, without stated terms, when they act as though an agreement exists.

The second pair is about progress. An executed contract is fully performed, with every obligation complete. An executory contract still has something left to do. A purchase contract that is signed but has not closed is executory, since performance is pending. Once closing happens and both sides finish, it is executed. Do not confuse executed as in signed with executed as in fully performed. On the exam, executed means completely performed.

How to study contract law for the exam

Snippet answer: Study contract law in three layers. First, memorize the five essential elements: competent parties, mutual agreement, consideration, legal purpose, and writing for real estate. Second, learn the four statuses, especially void versus voidable. Third, learn the classifications: bilateral versus unilateral, express versus implied, and executed versus executory. Then practice labeling contracts in short scenarios.

Build the layers in order. The elements tell you whether a contract is valid at all. The statuses tell you how enforceable it is. The classifications tell you what kind it is. Most questions test one of these three layers.

Keep this spoke tied to its neighbors. The offer, counteroffer, and acceptance spoke goes deeper on mutual agreement, the earnest money and option period spoke shows consideration and a unilateral option in action, and the Contracts and Agency hub ties the area together.

Frequently asked questions

What are the essential elements of a valid real estate contract? A valid real estate contract needs competent parties with legal capacity, mutual agreement through offer and acceptance, consideration or an exchange of value, and a legal purpose. Because it involves real estate, it must also be in writing under the statute of frauds. Missing any of these means the contract is not a valid, enforceable agreement.

What is the difference between a void and a voidable contract? A void contract has no legal effect at all and binds no one, usually because it lacks an essential element, like an illegal purpose. A voidable contract is valid and binding, but one party, the disadvantaged one, may choose to cancel it. Contracts made by a minor or induced by fraud, duress, or misrepresentation are voidable, not void.

Why must real estate contracts be in writing? Because of the statute of frauds, which requires contracts for the sale of real estate to be in writing to be enforceable in court. An oral agreement to sell land may be honored voluntarily, but if one party backs out, the other generally cannot force performance. This is why real estate sales use written contracts.

Is a signed purchase contract that has not closed executed or executory? It is executory. An executory contract still has unfinished obligations, and a signed purchase contract awaiting closing has performance pending on both sides. Once the sale closes and both parties complete their obligations, the contract becomes executed, meaning fully performed. Do not confuse executed with merely signed.

Practice questions

1. A contract is signed by a party who is a minor. The contract is: A. Void, because a minor cannot form any agreement B. Voidable, because the minor may choose to cancel it C. Valid and fully binding on the minor D. Unenforceable by both parties

Answer: B. A contract with a minor is voidable, meaning it is valid but the minor may cancel it. It is not automatically void (A), it does not fully bind the minor (C), and the issue is the minor's option to disaffirm, not general unenforceability (D).

2. Two parties make an oral agreement to sell a house, but nothing is put in writing. What is the status of this agreement? A. Void from the start B. Fully enforceable if witnessed C. Unenforceable under the statute of frauds D. Automatically valid because they agreed

Answer: C. The statute of frauds requires real estate sale contracts to be in writing to be enforceable, so an oral agreement is unenforceable in court. It is not necessarily void (A), witnesses do not cure the writing requirement (B), and agreement alone does not make it enforceable (D).

3. In a standard real estate purchase agreement, the buyer promises to buy and the seller promises to sell. This is a: A. Unilateral contract B. Bilateral contract C. Void contract D. Implied contract

Answer: B. When both parties exchange promises, the contract is bilateral, and a standard purchase agreement is the classic example. A unilateral contract is a promise for an act (A), the contract is valid rather than void (C), and its terms are expressly stated, not implied (D).

4. A purchase contract is signed but has not yet closed. This contract is best described as: A. Executed B. Executory C. Void D. Unilateral

Answer: B. A signed contract with performance still pending is executory. It becomes executed only when fully performed at closing (A). It is a valid contract, not void (C), and it is bilateral, not unilateral (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 essential elements of a valid contract, competent parties, mutual agreement, consideration, and legal purpose, come from general contract law as applied to real estate.
• The four contract statuses, valid, void, voidable, and unenforceable, and their definitions come from general contract law.
• The classifications of bilateral versus unilateral, express versus implied, and executed versus executory come from general contract law.
• The requirement that real estate contracts be in writing comes from the statute of frauds, in Texas the Business and Commerce Code, Section 26.01.

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

Official source links

• Texas Business and Commerce Code Section 26.01 (Statute of Frauds)
• Texas Real Estate Commission, Contracts
• Texas Occupations Code Chapter 1101 (TRELA)

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 law is technical and depends on the specific facts and current law. Always confirm the current Texas statutes and work under the supervision of your sponsoring broker before acting.