4.1 Contract Types and Required Elements

Nearly every real estate transaction runs on contracts, so the national exam tests your ability to classify contract types and recognize the elements that make an agreement legally binding. Master the vocabulary first, then learn how missing elements push a contract toward being void, voidable, or merely unenforceable.

How Contracts Are Classified

Exam writers love pairs of opposites. A contract is express when its terms are spoken or written, and implied when conduct alone signals agreement. Separately, a bilateral contract is a promise traded for a promise, while a unilateral contract offers a promise in return for a completed act.

A signed purchase agreement is the classic bilateral, express contract: the buyer promises to pay and the seller promises to convey. An open-listing reward ("I pay only if you produce a buyer") leans unilateral because the broker earns nothing until the act is fully performed.

Contract Classification Table

The Five Required Elements

A valid contract needs all five elements below. Memorize them as a checklist because the exam frequently removes one and asks for the result.

1. Offer and acceptance (mutual assent / meeting of the minds)
2. Consideration (an exchange of value)
3. Legal capacity of the parties
4. Legal purpose (lawful object)
5. Genuine consent, free of fraud, duress, or undue influence

Offer, Acceptance, and Counteroffers

Mutual assent appears through a definite offer and an unqualified acceptance. The moment the offeree alters any term, the response becomes a counteroffer that legally rejects and destroys the original offer. The original offeror is now free to walk away because there is nothing left to accept.

Example: a buyer offers $420,000 with a 45-day close. The seller signs but writes in a 30-day close. No contract exists yet. The seller has made a counteroffer, and the buyer must now accept the 30-day term before a binding agreement forms.

Consideration Versus Earnest Money

Consideration is the bargained-for exchange of value, usually the purchase price set against the deed. Earnest money is only a good-faith deposit; it can strengthen a deal but is not a required element. A $500,000 contract with a $1,000 deposit is just as valid as one with $25,000 down.

Void, Voidable, and Unenforceable

These three terms are heavily tested:

• Void: no contract ever existed (illegal purpose, forged deed).
• Voidable: valid until one party with the power to cancel chooses to disaffirm (a minor's contract, a deal induced by fraud).
• Unenforceable: valid on its face but courts will not enforce it (an oral sale violating the statute of frauds, or a barred claim past the statute of limitations).

Capacity and Legal Purpose

Minors, persons adjudged mentally incompetent, and the intoxicated generally create voidable contracts they may cancel. Corporations act through authorized agents. The object must be lawful: a listing that violates fair housing, or an agreement to conceal a known defect, is void because the purpose is illegal.

The Essential Elements (Memory Aid)

A valid contract needs five elements, often memorized as competent parties, mutual agreement, consideration, legal purpose, and (for real estate) a writing:

If any of the first four is missing the contract is generally void; if the writing is missing, a land contract is unenforceable rather than void.

Offer, Acceptance, and Termination of Offers

Mutual assent forms only when an offer is met by an acceptance that mirrors its terms exactly — the mirror-image rule. Any change in terms is a counteroffer, which rejects and extinguishes the original offer and hands the power of acceptance to the other party. An offer terminates by acceptance, rejection, counteroffer, lapse of a stated time, revocation before acceptance, or the death or incapacity of either party before acceptance.

Acceptance of a real estate offer is generally effective only when communicated back to the offeror, so a signed contract sitting in an agent's desk drawer has not yet formed a binding agreement until the offeror is notified.

Express, Implied, Bilateral, and Unilateral

Contracts are also classified by how they form and who is obligated. An express contract is stated in words, oral or written; an implied contract arises from conduct. A bilateral contract is a promise exchanged for a promise — a purchase agreement, where the buyer promises to pay and the seller promises to convey, is bilateral. A unilateral contract is a promise exchanged for an act, accepted only by performance; an open listing is unilateral because the broker is paid only if and when the broker actually produces a buyer.

An executory contract is still being performed (after signing, before closing), while an executed contract is fully performed (after closing). Knowing these labels lets you answer questions that ask whether a party can yet be held to the bargain.

Common Exam Traps

• Treating a counteroffer as a partial acceptance; it fully terminates the prior offer.
• Calling a minor's contract "void" when it is voidable at the minor's choice.
• Assuming earnest money is mandatory for validity.
• Mixing up void (never valid) with unenforceable (valid but uncollectible).

Key Takeaways