CPA Exam Business Law: Contracts, Sales, Commercial Paper
Last updated: May 2, 2026
Business Law: Contracts, Sales, Commercial Paper questions are one of the highest-leverage areas to study for the CPA Exam. This guide breaks down the rule, the elements you need to recognize, the named traps that catch most students, and a memory aid that scales to test day. Read it once, then practice the same sub-topic adaptively in the app.
The rule
On REG, every contracts/sales/commercial-paper question first requires you to identify which body of law governs: common law (services, real estate, employment), UCC Article 2 (sale of goods between any parties, with merchant-specific rules layered on top), or UCC Article 3 (negotiable instruments — notes and drafts). Common law demands a definite offer, mirror-image acceptance, and consideration; UCC Article 2 relaxes definiteness, allows additional terms in acceptances between merchants under $\S 2{-}207$, and adds the merchant's firm offer, the merchant's confirmatory memo exception to the Statute of Frauds, and implied warranties of merchantability. UCC Article 3 asks whether an instrument is negotiable (the seven-element test) and, separately, whether the transferee qualifies as a holder in due course (HDC) who takes free of personal defenses. Misidentifying the governing body is the single most common way candidates lose these points.
Elements breakdown
Common-law contract formation
Governs services, real estate, employment, and intangible-rights contracts.
- Offer with definite terms
- Mirror-image acceptance required
- Bargained-for consideration
- No Statute of Frauds writing for goods rule
- Modification requires new consideration
Common examples:
- Construction contract
- Employment agreement
- Sale of land
UCC Article 2 — sale of goods
Governs contracts for sale of movable, tangible goods regardless of price; merchant rules apply when one or both parties deal in goods of that kind.
- Quantity is the only essential term
- Open price gap-filled at reasonable price
- Acceptance valid even with additional terms
- Firm offer by merchant in signed writing
- Statute of Frauds writing required at $500 or more
- Implied warranty of merchantability for merchant sellers
- Risk of loss rules differ by shipment vs. destination contract
Common examples:
- Sale of inventory
- Equipment purchase
- Supply contract for raw materials
UCC § 2-207 battle of the forms
Resolves discrepancies between offer and acceptance in goods contracts.
- Acceptance with additional terms still forms contract
- Between merchants, additional terms become part unless materially altering, expressly limited, or timely objected
- Different terms drop out under knockout rule in most jurisdictions
- Conduct can form contract even if writings disagree
UCC Article 3 — negotiability test
An instrument must satisfy all seven elements to be negotiable.
- In writing
- Signed by maker or drawer
- Unconditional promise or order
- Fixed amount of money
- Payable on demand or at definite time
- Payable to order or to bearer
- No other undertaking except payment
Common examples:
- Promissory note
- Cashier's check
- Personal check
Holder in due course (HDC) status
A holder who takes a negotiable instrument under specific conditions and takes free of personal defenses.
- Holder of properly negotiated instrument
- Takes for value (not gift, not executory promise)
- Takes in good faith (honesty in fact + reasonable commercial standards)
- Takes without notice of defects, dishonor, overdue status, or claims
- Takes free of personal defenses (lack of consideration, fraud in inducement, breach of warranty)
- Still subject to real defenses (forgery, material alteration, infancy, fraud in execution, discharge in bankruptcy)
Statute of Frauds — writing requirements
Categories of contracts that must be evidenced by a signed writing.
- Marriage contracts
- Contracts not performable within one year
- Land sales and interests in land
- Executor promises to pay decedent's debts personally
- Goods of $500 or more (UCC)
- Suretyship promises (collateral, not original)
Common examples:
- MY LEGS mnemonic
Common patterns and traps
The Predominant-Purpose Misclassification
Mixed contracts (goods plus services) trigger the predominant-purpose test, but candidates often default to whichever body of law was mentioned most recently in the fact pattern. The exam writes scenarios where the dollar allocation, the language used ("installation," "materials," "labor"), and the nature of the contract all point in different directions. Whichever element dominates economically and in purpose controls the entire contract — you don't bifurcate.
A choice that says the contract is "governed in part by Article 2 and in part by common law" or that splits the contract into two governance regimes.
The Mirror-Image Trap in Goods
When a merchant acknowledgment contains additional or different terms, candidates trained on common law assume the acceptance is a counteroffer and no contract forms until the offeror assents. Under UCC $\S 2{-}207$, the contract usually forms on the acknowledgment, and the additional terms get analyzed separately. Wrong choices invoke common-law mirror-image reasoning to claim no contract exists.
A choice that says "no contract was formed because the acceptance varied the terms of the offer."
The Personal-vs-Real Defense Swap
Once a transferee qualifies as an HDC, they take free of personal defenses (fraud in the inducement, lack/failure of consideration, breach of warranty, unauthorized completion of blanks) but remain subject to real defenses (forgery, material alteration, fraud in the execution, infancy, discharge in insolvency, illegality that voids the contract). The exam swaps the categories — putting fraud in the inducement on the real-defense list, or claiming forgery is a personal defense.
A choice that lists "fraud" as a defense good against an HDC without specifying execution vs. inducement, or that says material alteration is cut off by HDC status.
The Firm-Offer Overreach
A merchant's firm offer under UCC $\S 2{-}205$ requires (1) a merchant, (2) a signed writing, (3) giving assurance the offer will be held open, and is irrevocable for the time stated or a reasonable time, but never more than 90 days. Candidates miss the merchant requirement, miss the writing requirement, or extend the irrevocability beyond 90 days when the offer states a longer period.
A choice that treats an oral assurance to hold an offer open as binding without consideration, or that enforces a six-month firm offer for the full six months.
The Statute-of-Frauds Writing Sufficiency Trap
Under UCC $\S 2{-}201$, the writing need only indicate a contract was made, be signed by the party to be charged, and state a quantity — but is enforceable only up to the quantity stated. The merchant's confirmatory memo exception binds a non-signing merchant who fails to object within 10 days. Wrong choices either demand all material terms be in the writing or ignore the 10-day window.
A choice that says the contract is unenforceable because price or delivery terms were missing from the signed writing.
How it works
Start every question by classifying. If Reyes Manufacturing hires Liu Industries to install a custom HVAC system, that's a mixed contract — apply the predominant-purpose test; if the dominant purpose is the equipment (goods), Article 2 governs the entire contract. Once you know the body of law, run the formation checklist. Suppose Reyes sends a purchase order to Liu (a merchant) for 500 units at $40 each, and Liu's acknowledgment adds an arbitration clause. Under common law, that would be a counteroffer and no contract forms until Reyes assents. Under $\S 2{-}207$, the contract forms on Liu's acknowledgment, and the arbitration clause becomes part of the deal only if it does not materially alter the contract — and arbitration clauses are usually treated as material alterations, so the term drops out but the contract stands. For commercial paper, separate the two questions: "Is the instrument negotiable?" (the seven-element test, applied to the face of the document only) and "Is this transferee an HDC?" (status of the holder, evaluated at the time of transfer). Real defenses defeat even an HDC; personal defenses do not.
Worked examples
Which of the following best describes the legal status of the contract and the arbitration clause?
- A No contract was formed because Liu's acknowledgment added a material term, which under the mirror-image rule constitutes a counteroffer that Reyes never accepted.
- B A contract was formed on March 5, but the arbitration clause is not part of the contract because it materially alters the deal and Reyes never expressly assented to it. ✓ Correct
- C A contract was formed on March 5 and includes the arbitration clause because, between merchants, additional terms in an acceptance automatically become part of the contract.
- D No contract was formed because the purchase order failed to specify all material terms, including warranties and risk of loss, as required under the UCC Statute of Frauds.
Why B is correct: The contract is for the sale of goods between two merchants, so UCC Article 2 governs. Under $\S 2{-}207(1)$, a definite expression of acceptance operates as an acceptance even though it states additional terms, so a contract formed on March 5. Under $\S 2{-}207(2)$, between merchants, additional terms become part of the contract unless they materially alter it; arbitration clauses imposing binding arbitration are routinely held to be material alterations because they strip the right to a judicial forum and a jury, so the arbitration term drops out while the contract stands.
Why each wrong choice fails:
- A: This applies the common-law mirror-image rule to a sale of goods. UCC $\S 2{-}207$ explicitly displaces mirror-image; an acceptance with additional terms still forms a contract. (The Mirror-Image Trap in Goods)
- C: Additional terms between merchants do not become part of the contract automatically — they fall out if they materially alter the deal, are expressly limited by the offer, or are objected to within a reasonable time. Arbitration clauses are typically material. (The Mirror-Image Trap in Goods)
- D: UCC $\S 2{-}201$ requires only a writing indicating a contract, signed by the party to be charged, and stating a quantity. Price, warranties, and risk of loss are gap-filled by Article 2 defaults. (The Statute-of-Frauds Writing Sufficiency Trap)
What is the most likely outcome?
- A Avila prevails because breach of warranty is a real defense good against any holder of a negotiable instrument.
- B Okonkwo prevails because it qualifies as a holder in due course and breach of warranty is a personal defense cut off by HDC status. ✓ Correct
- C Okonkwo prevails because the note is non-negotiable, and Avila therefore cannot raise contract defenses against a transferee for value.
- D Avila prevails because Okonkwo paid less than face value, which constitutes notice of a defect and defeats HDC status as a matter of law.
Why B is correct: The note satisfies all seven negotiability elements under UCC Article 3 (writing, signed, unconditional promise, fixed amount of money, definite time, payable to order, no other undertaking). Okonkwo took the note for value ($47,500 cash), in good faith, without notice of any defect, dishonor, or claim — qualifying as a holder in due course. Breach of warranty is a personal defense, which is cut off against an HDC under $\S 3{-}305$, so Okonkwo can enforce the note for its full face value.
Why each wrong choice fails:
- A: Breach of warranty is a personal defense, not a real defense. Real defenses (forgery, material alteration, fraud in the execution, infancy, discharge in insolvency, illegality voiding the contract) are good against HDCs; breach of warranty is not on that list. (The Personal-vs-Real Defense Swap)
- C: The note is plainly negotiable — it satisfies every element of the seven-element test. Misclassifying it as non-negotiable ignores the unconditional promise, the fixed amount, the definite time, and the order language.
- D: Buying an instrument at a discount does not, by itself, constitute notice of a defect or defeat HDC status. A discount is normal commercial practice reflecting time value of money and credit risk; HDC status turns on actual notice and good faith, not the purchase price. (The Personal-vs-Real Defense Swap)
Which of the following best describes the parties' rights?
- A Tanaka's revocation was effective on October 5 because, absent consideration, no offer can be made irrevocable under the UCC or common law.
- B Brennan formed a binding contract on November 20 because the offer was irrevocable for the full 120 days as stated in the signed writing.
- C Brennan formed a binding contract on November 20 because, although the firm-offer period is capped at 90 days, Brennan's acceptance fell within that 90-day window. ✓ Correct
- D No contract was formed because Brennan's November 20 acceptance was not a mirror-image of the September 10 offer.
Why C is correct: Under UCC $\S 2{-}205$, a merchant's signed written offer giving assurance it will be held open is irrevocable without consideration, but the irrevocability period cannot exceed 90 days regardless of any longer period stated. Tanaka is a merchant, the offer was in a signed writing, and it gave express assurance of being held open — so the offer was irrevocable for the maximum 90 days from September 10. Brennan accepted on November 20, which is 71 days after September 10 and within the 90-day cap, so Tanaka's October 5 attempted revocation was ineffective and a contract formed.
Why each wrong choice fails:
- A: This ignores UCC $\S 2{-}205$, which expressly creates an exception to the consideration requirement for merchant firm offers in a signed writing. Consideration is required for an option contract under common law, but not for an Article 2 firm offer. (The Firm-Offer Overreach)
- B: The 120-day period stated in the offer exceeds the statutory cap. Even if the offer says "120 days," $\S 2{-}205$ limits irrevocability to 90 days. After day 90, the offer becomes revocable even though the merchant said otherwise. (The Firm-Offer Overreach)
- D: Brennan's acceptance did mirror the offer's terms — the question doesn't indicate Brennan added or changed any term. And in any case, $\S 2{-}207$ would generally allow contract formation despite minor variations. (The Mirror-Image Trap in Goods)
Memory aid
Three gates: (1) Which law? — goods → UCC 2, services → common law, instrument → UCC 3. (2) Is it formed/negotiable? (3) Who wins on defenses? Use MY LEGS for Statute of Frauds categories.
Key distinction
Negotiability (a property of the instrument's face) is distinct from holder-in-due-course status (a property of the transferee). An instrument can be negotiable without anyone holding it as an HDC, and HDC status is irrelevant if the instrument was never negotiable in the first place.
Summary
Identify the governing body first, apply the right formation rules second, and on commercial paper always separate the negotiability test from HDC status — defenses turn on which is which.
Practice business law: contracts, sales, commercial paper adaptively
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Start your free 7-day trialFrequently asked questions
What is business law: contracts, sales, commercial paper on the CPA Exam?
On REG, every contracts/sales/commercial-paper question first requires you to identify which body of law governs: common law (services, real estate, employment), UCC Article 2 (sale of goods between any parties, with merchant-specific rules layered on top), or UCC Article 3 (negotiable instruments — notes and drafts). Common law demands a definite offer, mirror-image acceptance, and consideration; UCC Article 2 relaxes definiteness, allows additional terms in acceptances between merchants under $\S 2{-}207$, and adds the merchant's firm offer, the merchant's confirmatory memo exception to the Statute of Frauds, and implied warranties of merchantability. UCC Article 3 asks whether an instrument is negotiable (the seven-element test) and, separately, whether the transferee qualifies as a holder in due course (HDC) who takes free of personal defenses. Misidentifying the governing body is the single most common way candidates lose these points.
How do I practice business law: contracts, sales, commercial paper questions?
The fastest way to improve on business law: contracts, sales, commercial paper is targeted, adaptive practice — working questions that focus on your specific weak spots within this sub-topic, getting immediate feedback, and revisiting items you missed on a spaced-repetition schedule. Neureto's adaptive engine does this automatically across the CPA Exam; start a free 7-day trial to see your sub-topic mastery climb in real time.
What's the most important distinction to remember for business law: contracts, sales, commercial paper?
Negotiability (a property of the instrument's face) is distinct from holder-in-due-course status (a property of the transferee). An instrument can be negotiable without anyone holding it as an HDC, and HDC status is irrelevant if the instrument was never negotiable in the first place.
Is there a memory aid for business law: contracts, sales, commercial paper questions?
Three gates: (1) Which law? — goods → UCC 2, services → common law, instrument → UCC 3. (2) Is it formed/negotiable? (3) Who wins on defenses? Use MY LEGS for Statute of Frauds categories.
What's a common trap on business law: contracts, sales, commercial paper questions?
Applying common law to a goods contract (or vice versa)
What's a common trap on business law: contracts, sales, commercial paper questions?
Treating an additional term in a merchant acknowledgment as automatic rejection
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Take a free CPA Exam assessment — about 25 minutes and Neureto will route more business law: contracts, sales, commercial paper questions your way until your sub-topic mastery score reflects real improvement, not luck. Free for seven days. No credit card required.
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