You’re staring at your Contracts outline—200 pages of dense case law, UCC provisions, and common law rules that somehow need to fit into your brain before test day. Every time you think you’ve nailed offer and acceptance, you blank on the mailbox rule. You know consideration matters, but can you actually spot an illusory promise under pressure?

Contracts accounts for roughly 25-30 questions on the MBE, making it one of the most heavily tested subjects. You can’t afford to treat it as secondary. This complete MBE contracts study guide breaks down exactly what you need to memorize, how the NCBE tests each concept, and where students typically lose points.

Understanding What the MBE Actually Tests in Contracts

The NCBE doesn’t care if you can write a law review article on the Uniform Commercial Code. They want to know if you can apply black letter law to messy fact patterns in 1.8 minutes per question.

MBE Contracts questions fall into predictable categories based on the subject matter outline:

Most students waste time memorizing every case from their 1L Contracts course. The MBE doesn’t test Hadley v. Baxendale by name—it tests whether you know the foreseeability limitation on consequential damages. Strip away the case names and focus on the rules.

Common Law vs. UCC: Getting the Governing Law Right

Before you can apply any Contracts rule, you need to know which law governs. This is where many students lose easy points.

Common law governs contracts for services, real estate, and employment. UCC Article 2 governs contracts for the sale of goods—things that are movable and tangible at the time they’re identified to the contract.

The distinction matters because the rules diverge significantly. Under common law, an acceptance must mirror the offer exactly (the mirror image rule). Add or change even one term, and you’ve made a counteroffer that kills the original offer.

Under the UCC’s battle of the forms rule (§2-207), you can accept with different terms and still form a contract. Between merchants, additional terms automatically become part of the contract unless they materially alter the deal, the offer expressly limits acceptance to its terms, or the offeror objects within a reasonable time.

Here’s a classic MBE trap: A buyer sends a purchase order for 500 widgets at $10 each. The seller responds with an acknowledgment form agreeing to the quantity and price but adding an arbitration clause. Is there a contract? Under common law, no—the arbitration clause is a counteroffer. Under the UCC, yes—the acknowledgment operates as acceptance, and whether the arbitration clause becomes part of the contract depends on whether it materially alters the deal.

What about mixed contracts involving both goods and services? Apply the predominant purpose test. If a homeowner hires a contractor to install a custom kitchen (labor + materials), ask what the essence of the deal is. If it’s primarily about the service of installation, common law governs. If it’s primarily about purchasing specific cabinetry, the UCC governs.

Formation: Where Most MBE Points Are Won or Lost

Contract formation is the most heavily tested area. You need to recognize offers, distinguish them from preliminary negotiations, and know when acceptance creates a binding contract.

An offer requires three elements: (1) present contractual intent, (2) definite and certain terms, and (3) communication to an identified offeree. The NCBE loves testing what counts as “definite and certain.”

Under common law, you need all essential terms—parties, subject matter, price, and time of performance. Missing any of those? No offer. Under the UCC, only quantity is required. The code supplies gap fillers for everything else: price becomes the reasonable price at time of delivery, delivery happens at the seller’s place of business, and payment is due when the goods are delivered.

Real estate contracts have a special rule: you must identify the land and state the price. “I’ll sell you my house for a fair price” isn’t an enforceable offer—too indefinite.

Advertisements are generally invitations to negotiate, not offers. Exception: an ad becomes an offer if it’s specific, leaves nothing open for negotiation, and limits who can accept. “First 10 customers get this TV for $100” is an offer. “TVs on sale starting at $100” is not.

When Offers Become Irrevocable

Normally, an offeror can revoke anytime before acceptance. But the MBE regularly tests four situations where revocation is not allowed:

  1. Option contracts — The offeree paid consideration to keep the offer open for a stated period. Even nominal consideration ($1) is sufficient.

  2. UCC firm offers (§2-205) — A merchant’s signed written offer to buy or sell goods is irrevocable for the stated time, or up to three months if no time is stated. Critically, no consideration is required.

  3. Unilateral contracts — Once the offeree begins performance (not mere preparation), the offer becomes irrevocable. If I offer you $500 to paint my house and you show up with brushes and start painting, I can’t revoke. But if you’re still at the paint store buying supplies, I can.

  4. Detrimental reliance — If the offeror should reasonably expect the offer to induce reliance, and it does, the offer may be irrevocable under promissory estoppel principles.

The Mailbox Rule and Its Exceptions

Acceptance is generally effective upon dispatch—the moment you drop it in the mailbox or hit send. This is the mailbox rule, and it creates counter-intuitive results.

Suppose you mail an acceptance on Monday, then change your mind and call to reject on Tuesday. The offeror receives your rejection call on Tuesday and your acceptance letter on Wednesday. There’s a contract—acceptance was effective Monday when you mailed it.

But know the exceptions:

The NCBE tests these exceptions relentlessly. Read the call of the question carefully—it often asks what result “at the moment” a particular communication is sent or received.

Consideration and Its Substitutes

A promise is only enforceable if it’s supported by consideration—a bargained-for exchange of legal value. Each party must suffer a detriment or provide a benefit that induces the other’s promise.

Courts don’t care about adequacy. You can exchange a car for a dollar. But the consideration must be bargained for, not a gift or past act. “I’ll pay you $1,000 because you rescued my child last week” isn’t enforceable—the rescue is past consideration, not bargained for.

The Pre-Existing Duty Rule

Promising to do something you’re already legally obligated to do is not valid consideration. If a contractor agrees to build your deck for $10,000, then halfway through demands an extra $2,000 to finish, your promise to pay more is not supported by consideration under common law. The contractor already had a duty to finish.

Exceptions matter:

The UCC eliminates this problem for sale-of-goods contracts. Under §2-209, contract modifications require only good faith—no new consideration needed. But if the modified contract falls within the Statute of Frauds (goods priced at $500 or more), you need a signed writing.

When Consideration Isn’t Required

Three doctrines can make a promise enforceable without consideration:

Promissory estoppel applies when: (1) there’s a clear and definite promise, (2) the promisor should reasonably expect the promise to induce reliance, (3) the promisee does rely, and (4) injustice can only be avoided by enforcement. This often comes up with charitable pledges or employer promises that induce employees to quit other jobs.

Quasi-contract (unjust enrichment) isn’t really a contract—it’s a remedy imposed by law to prevent one party from being unjustly enriched. Recovery is measured by the reasonable value of the benefit conferred, not the contract price.

Moral obligation occasionally supports a promise under the Restatement if a promise is made in recognition of a benefit previously received, and enforcement is necessary to prevent injustice. This is narrow and fact-specific.

Defenses to Enforceability

Even when you have a valid offer, acceptance, and consideration, the contract may still be unenforceable due to defenses.

Statute of Frauds

Certain contracts must be evidenced by a signed writing. Memorize the categories using MYLEGS:

The writing doesn’t need to be formal—it just needs to identify the parties, subject matter, and essential terms, and be signed by the party against whom enforcement is sought.

The UCC has special exceptions for goods: (1) specially manufactured goods not suitable for sale to others, (2) admission in pleadings or court that a contract existed, (3) partial performance (enforceable to the extent of goods accepted or paid for), and (4) between merchants, if a written confirmation is sent and the recipient doesn’t object within 10 days.

Incapacity

Contracts with minors are voidable at the minor’s option. Upon reaching majority, the minor can ratify or disaffirm. If disaffirmed, the minor must return whatever consideration is still in their possession (but isn’t liable for depreciation or damage). Exception: minors are liable in quasi-contract for the reasonable value of necessities—food, shelter, clothing, medical care.

Mental incapacity makes a contract voidable if the person couldn’t understand the nature and consequences of the transaction. If a guardian has been appointed, the contract is void entirely.

Intoxication makes a contract voidable only if the person was so impaired they couldn’t understand the transaction, and the other party had reason to know.

Duress, Undue Influence, and Unconscionability

Duress requires an improper threat that leaves the victim no reasonable alternative. Physical threats obviously qualify, but so do wrongful threats of criminal prosecution or bad-faith threats of civil action. Economic duress exists when a threat seriously jeopardizes the other party’s property or finances and they have no adequate alternative.

Undue influence involves unfair persuasion by someone in a position of trust or authority—think attorney-client, doctor-patient, or family relationships where one party dominates the other.

Unconscionability has two flavors: procedural (unfair bargaining process, like hidden terms or high-pressure tactics) and substantive (terms so one-sided they shock the conscience). Courts can refuse to enforce the entire contract or just the unconscionable clause.

Mistake

Mutual mistake makes a contract voidable if both parties were mistaken about a basic assumption at the time of contracting, the mistake materially affects the exchange, and the adversely affected party didn’t assume the risk. Classic example: both parties believe they’re contracting for a genuine antique, but it’s a reproduction.

Unilateral mistake generally doesn’t provide relief—you’re stuck with your error. Exceptions: (1) the other party knew or should have known of your mistake, (2) enforcement would be unconscioable, or (3) it was a clerical or computational error and the other party hasn’t relied yet.

Performance, Breach, and Conditions

Contracts don’t exist in a vacuum—parties have to perform. The MBE tests whether performance was adequate, whether breach was material, and what happens when performance becomes impossible.

Conditions vs. Promises

A condition is an event that must occur before a party’s duty to perform arises. Conditions can be express (stated in the contract), implied (read into the contract based on the parties’ intent), or constructive (imposed by courts to do justice).

Common law recognizes conditions precedent (must occur before performance is due), conditions concurrent (performances are exchanged simultaneously), and conditions subsequent (excuses a duty after it has arisen).

Failure of a condition excuses performance—it doesn’t create liability. Breach of a promise creates liability.

Time is generally not “of the essence” unless the contract says so or the circumstances make clear that timing is critical (like a wedding photographer). If time isn’t of the essence, performance is due within a reasonable time.

Material Breach vs. Minor Breach

Under common law, if a breach is material, the non-breaching party can suspend performance and sue for damages. If the breach is minor, the non-breaching party must still perform but can sue for damages caused by the breach.

Factors for materiality:

The substantial performance doctrine applies to construction contracts. If a builder substantially performs (minor deviations only), they can recover the contract price minus damages for the defects. This prevents forfeiture for trivial breaches.

The UCC is stricter. Under the perfect tender rule, if goods or delivery fail in any respect to conform to the contract, the buyer can reject the entire shipment, accept the entire shipment, or accept any commercial unit and reject the rest. Exceptions include installment contracts (rejection allowed only if the defect substantially impairs value) and the seller’s right to cure defects before the delivery deadline.

Impossibility, Impracticability, and Frustration of Purpose

Impossibility discharges contractual duties when performance becomes objectively impossible due to an unforeseeable event. Classic examples: destruction of the subject matter, death or incapacity in a personal services contract, or supervening illegality.

Impracticability (UCC §2-615) is broader. Performance is excused if an unforeseeable event makes performance commercially impracticable—not just more expensive, but so burdensome that it would be manifestly unjust to require it.

Frustration of purpose applies when an unforeseeable event destroys the purpose of the contract, even though performance is still possible. The famous case involved a contract to rent a room to watch a coronation parade—when the parade was cancelled, the purpose was frustrated.

All three defenses require that the event was unforeseeable and not the fault of the party seeking excuse.

Remedies: What You Get When Someone Breaches

The default remedy for breach is expectation damages—money to put the non-breaching party in the position they would have been in had the contract been performed. This includes direct damages and, if foreseeable, consequential damages (losses beyond the contract itself, like lost profits).

Three limitations apply:

  1. Certainty — Damages must be proven with reasonable certainty. Lost profits for a new business are too speculative; lost profits for an established business are not.

  2. Foreseeability — Consequential damages are only recoverable if they were foreseeable at the time of contracting. If you don’t tell the seller you need widgets by Friday for a lucrative resale, you can’t recover lost profits when they arrive late.

  3. Mitigation — The non-breaching party must take reasonable steps to minimize damages. If your employee quits, you must try to hire a replacement. If you don’t, you can’t recover wages you could have avoided paying.

Reliance and Restitution Damages

Reliance damages put the plaintiff in the position they were in before the contract—out-of-pocket expenses incurred in reliance on the contract. This is common when expectation damages are too speculative.

Restitution prevents unjust enrichment by requiring the defendant to return the value of any benefit received. This can sometimes exceed expectation damages if the contract was a bad deal for the plaintiff.

Specific Performance and Injunctions

Specific performance is an equitable remedy ordering the breaching party to perform. It’s only available when money damages are inadequate—typically for unique goods (art, heirlooms, real estate) or when the subject matter can’t be purchased elsewhere.

The UCC allows specific performance for goods when they’re unique or “in other proper circumstances” (like severe shortage). Courts have ordered specific