International Sale of Goods and the CISG

Introduction and Context

International sales contracts connect buyers and sellers located in different states, often across different legal systems, currencies, languages, and commercial practices. The central legal problem is not merely identifying the price and the product. It is determining which law governs the transaction, how the contract was formed, what quality and delivery obligations apply, when risk passes, and what remedies are available after breach.

The United Nations Convention on Contracts for the International Sale of Goods (CISG) provides a largely uniform legal framework for these questions. Adopted in 1980, it is administered through the United Nations Commission on International Trade Law (UNCITRAL). The CISG applies in a substantial number of trading states and is especially important in manufactured goods, commodities, industrial equipment, and cross-border distribution.

The CISG is not a complete code of international commerce. It generally excludes consumer purchases, securities, ships, aircraft, electricity, and contracts in which services or work predominate over the supply of goods. It also does not govern validity questions such as fraud, mistake, illegality, capacity, or the transfer of property ownership. Those matters remain subject to applicable domestic law.

Learning Objectives

By the end of this chapter, students should be able to:

1. Determine whether the CISG applies to an international sale.
2. Analyze contract formation under the CISG.
3. Explain the obligations of sellers and buyers.
4. Apply CISG rules on conformity, inspection, notice, and risk.
5. Select and evaluate remedies for breach.
6. Compare the CISG with domestic sales law, particularly the United States Uniform Commercial Code (UCC).
7. Draft clauses adopting, modifying, or excluding the CISG.
8. Identify strategic, ethical, and governance issues in international sales contracting.

1. Scope and Structure of the CISG

1.1 Internationality and place of business

The CISG applies to contracts for the sale of goods between parties whose places of business are in different states when either:

• both states are Contracting States; or
• the rules of private international law lead to the law of a Contracting State.

The parties’ nationality is generally irrelevant. If a company is incorporated in one country but conducts the transaction through a branch or office in another, the relevant place of business is the one with the closest relationship to the contract and its performance (Article 10).

A party cannot usually avoid the CISG merely by arguing that its employees or agents were physically located elsewhere. The commercial centre responsible for the transaction is more significant than the nationality of personnel.

1.2 Sale of goods

The CISG does not comprehensively define “goods.” In practice, goods are movable, tangible items. Software creates difficult classification questions. Standard, off-the-shelf software supplied on a physical medium may be treated like goods in some contexts, whereas customized software and predominantly digital services may fall outside the Convention or require careful contractual treatment.

Mixed contracts require analysis of the principal purpose. Under Article 3(2), a contract for the supply of goods to be manufactured is generally a sale unless the buyer supplies a substantial part of the materials. A contract involving installation, engineering, maintenance, and training may fall outside the CISG if the service element predominates.

1.3 Matters excluded from the Convention

The CISG does not govern:

• the validity of the contract or any of its provisions;
• the effect of the contract on title to the goods;
• liability for death or personal injury caused by the goods; and
• many consumer transactions.

The CISG also does not regulate every procedural issue. Questions concerning jurisdiction, arbitration, limitation periods, evidence, insolvency, agency, and intellectual property may depend on other laws or instruments.

1.4 Party autonomy

The parties may exclude the CISG or vary the effect of its provisions, subject to Article 6. A clause stating “This contract shall be governed by the law of England” may be interpreted differently from “The CISG is expressly excluded and the domestic law of England and Wales applies.” The second clause is clearer because it identifies the intended exclusion.

Exclusion may be desirable where a party has a strong domestic-law position, where the transaction involves issues the CISG handles poorly, or where the parties want a detailed industry-specific regime. Conversely, exclusion may create uncertainty if the replacement law is not identified.

2. Contract Formation

2.1 Offer

Under Article 14, a proposal is an offer if it is sufficiently definite and indicates the offeror’s intention to be bound upon acceptance. The proposal should identify, expressly or implicitly, the goods and provide a means of determining quantity and price.

Advertisements, catalogues, and online listings are usually invitations to make offers unless they show a clear intention to be legally bound. The distinction is commercially important because an offer can become binding through acceptance, while an invitation normally cannot.

2.2 Acceptance

An acceptance is a statement or conduct indicating assent to an offer. Silence alone does not normally constitute acceptance. However, prior dealings, trade usages, or performance may establish that shipment, payment, or another act functions as acceptance.

Under Article 19, a response that adds, limits, or modifies terms is generally a rejection and counteroffer if the changes materially alter the offer. Changes involving price, payment, quality, quantity, place or time of delivery, liability, or dispute resolution are commonly material. Non-material additions may become part of the contract unless the offeror objects without undue delay, subject to the Convention’s detailed rules.

This approach differs from the UCC’s more permissive “battle of the forms” rule. Under UCC § 2-207, a definite expression of acceptance may form a contract even though it contains additional or different terms. The CISG approach is more focused on whether the response materially changes the proposed bargain.

2.3 Electronic contracting

The CISG is technologically neutral. Offers and acceptances may be communicated electronically, and electronic records can satisfy writing requirements where applicable, subject to domestic law and any reservation made by a Contracting State. Businesses should specify when an electronic message is received, which time zone applies, and whether automated acknowledgments create contractual commitments.

2.4 Modification and merger

The CISG does not impose a universal formal writing requirement. A contract may generally be modified by agreement, although Article 29 recognizes that a written-modification clause may require modifications to be in writing. Parties should address whether purchase-order systems, electronic signatures, and conduct by project managers can amend the contract.

3. Core Obligations of the Parties

3.1 Seller’s obligations

The seller must:

• deliver the goods;
• hand over documents relating to the goods; and
• transfer the goods in conformity with the contract.

Unless the parties agree otherwise, delivery is determined by Articles 31–34. In a shipment contract, the seller may satisfy its delivery obligation by handing the goods to the first carrier. In other circumstances, delivery may require placing the goods at the buyer’s disposal at a specified place.

The seller must also deliver goods free from third-party claims based on ownership, intellectual property, or other rights, subject to the Convention’s specific provisions and the buyer’s knowledge.

3.2 Buyer’s obligations

The buyer must:

• pay the price; and
• take delivery.

The price may be expressly stated or determined through the contract. If a contract is validly concluded without stating a price, Article 55 may support a reasonable-price approach where the parties intended to be bound. Nevertheless, leaving price mechanisms implicit is commercially risky. Contracts should specify currency, taxes, banking charges, payment milestones, credit support, and consequences of late payment.

Taking delivery includes cooperating with the seller and performing acts reasonably expected to enable delivery. A buyer that refuses to provide import documents or fails to nominate a carrier may itself be in breach.

4. Conformity of Goods and Inspection

4.1 Conformity under Article 35

Unless the parties have agreed otherwise, goods must:

1. conform to the quantity, quality, description, and type required by the contract;
2. be fit for ordinary purposes of goods of the same description;
3. be fit for any particular purpose expressly or impliedly made known to the seller, unless reliance on the seller’s skill or judgment was unreasonable;
4. possess the qualities of goods held out by a sample or model; and
5. be packaged in the usual manner or in a manner adequate to preserve and protect them.

Contractual specifications are primary. A seller may not avoid a specific obligation by showing that the goods are commercially usable. Conversely, a buyer that provides precise technical specifications may bear responsibility for defects resulting from those specifications.

The parties may alter the default conformity rules through express warranties, disclaimers, inspection protocols, acceptance criteria, tolerances, and documentary requirements. A clause stating “goods shall be of merchantable quality” may have a different legal meaning under domestic law than under the CISG; detailed technical language is preferable.

4.2 Fundamental breach

A breach is fundamental under Article 25 if it results in substantial detriment to the other party and the breaching party foresaw, or a reasonable person of the same kind would have foreseen, that result. Fundamental breach is central to avoidance of the contract. Not every defect or delay qualifies.

A court may consider whether repair, replacement, price reduction, or damages adequately protects the aggrieved party. The analysis is contextual and commercially realistic rather than dependent solely on formal non-compliance.

4.3 Examination and notice

Article 38 requires the buyer to examine the goods, or cause them to be examined, within as short a period as practicable in the circumstances. Article 39 requires notice specifying the lack of conformity within a reasonable time after the buyer discovered or ought to have discovered it. In any event, notice is generally barred after two years from the date the goods were actually handed over, unless inconsistent with a contractual guarantee period.

The notice must identify the defect with sufficient particularity. A statement such as “the goods are unacceptable” may be inadequate. A commercially useful notice identifies the shipment, product, quantity affected, nature of the problem, test results, and proposed interim measures.

The CISG does not require inspection to be scientifically perfect. The buyer’s obligation depends on the circumstances, including product complexity, packaging, transport, customary trade practice, and whether defects are latent.

5. Risk of Loss

Risk determines which party bears accidental loss or damage not caused by either party’s breach. The CISG’s risk rules must be read together with the delivery term, transport arrangement, and Incoterms® rule selected by the parties.

5.1 Shipment contracts

Where the contract involves carriage and does not require delivery at a particular destination, risk generally passes when the goods are handed to the first carrier. This is not a universal rule for every transaction. If the seller is required to hand the goods to a carrier at a specified place, or if the contract is a destination arrangement, the applicable provision may differ.

5.2 Goods in transit

For goods sold while already in transit, risk may pass when the contract is concluded, subject to the circumstances. The parties should identify who bears pre-contract transit risk and whether insurance is required.

5.3 Relationship with Incoterms®

Incoterms® rules allocate delivery tasks, transport costs, customs responsibilities, and risk at defined points. They do not replace the CISG entirely and do not generally determine title, price, payment, remedies, or dispute resolution. A contract should therefore state both the Incoterms® rule and the named place, for example, “CIP Rotterdam, Incoterms® 2020,” while separately addressing title, insurance scope, and conformity.

6. Remedies for Breach

The CISG adopts a remedial structure intended to preserve the bargain while limiting disproportionate outcomes.

6.1 Buyer’s remedies

If the seller breaches, the buyer may, depending on circumstances:

• require performance;
• require repair;
• require substitute goods where the breach is fundamental;
• reduce the price;
• claim damages;
• avoid the contract where the statutory conditions are satisfied; and
• suspend or withhold performance in appropriate circumstances.

The buyer must generally give the seller a reasonable opportunity to cure. A seller’s effective and timely cure can prevent avoidance, although it may not eliminate all damage claims.

Price reduction under Article 50 reflects the relationship between the value of conforming goods and the value of goods actually delivered. In symbolic form:

The values must be measured at the relevant time and in the relevant market. The formula assumes that the contract price corresponds to the value of conforming goods and that the ratio can be established reliably. It is not a general damages formula.

6.2 Seller’s remedies

If the buyer breaches, the seller may:

• require payment;
• require taking delivery;
• claim damages;
• grant an additional period for performance;
• avoid the contract for fundamental breach; and
• claim interest on sums in arrears.

A seller may not automatically avoid a contract merely because payment is late. The seriousness of the breach and applicable notice requirements matter.

6.3 Damages and foreseeability

Article 74 permits damages equal to the loss, including loss of profit, suffered as a consequence of the breach, provided that the loss was foreseeable at the time of contracting. The damages principle includes both actual loss and lost gain but is limited by foreseeability and mitigation.

Article 77 requires the injured party to take reasonable measures to reduce loss. A buyer that fails to obtain reasonable substitute goods, or a seller that leaves goods to deteriorate without taking protective action, may have its recovery reduced.

For a substitute transaction, Article 75 may permit recovery of the difference between the contract price and the price in a reasonable cover or resale transaction, together with additional damages. Where no substitute transaction occurs, Article 76 may use the difference between the contract price and the current price at the relevant time and place.

6.4 Exemption under Article 79

A party is not liable for damages if it proves that failure resulted from an impediment beyond its control, that it could not reasonably have been expected to take the impediment into account at contracting, and that it could not avoid or overcome the impediment or its consequences. An impediment affecting a supplier does not automatically excuse the contracting seller.

Article 79 is an exemption from damages, not necessarily a complete release from all contractual consequences. Payment obligations, termination rights, restitution, and other remedies require separate analysis. Force majeure clauses should therefore specify triggering events, notice, mitigation, allocation of supply-chain risk, and termination consequences.

7. Comparison with Domestic Sales Law

The CISG and domestic sales statutes share concepts such as conformity, delivery, damages, and commercial reasonableness, but important differences remain.

The comparison should not be reduced to a claim that one system is more favorable. Outcomes depend on drafting, evidence, trade usage, notice, product complexity, and the forum’s interpretive approach.

8. Applied Case: The Contaminated Polymer Shipment

The following is an illustrative fictional case.

Background

NordChem, a German manufacturer, agrees to sell 500 tonnes of polymer pellets to Pacific Components, a Singapore company. The contract states: “CIP Singapore, Incoterms® 2020. Specifications: moisture not exceeding 0.2%; delivery in March. CISG applies.” Payment is due 30 days after invoice. No detailed inspection or notice procedure is included.

The pellets are handed to the first carrier in Germany. On arrival, Pacific conducts a basic visual inspection but does not perform laboratory testing. Six weeks later, production machinery shows abnormal wear. Testing reveals moisture of 0.8% in approximately 30% of the shipment. Pacific immediately sends a detailed notice, suspends payment for the affected quantity, and purchases replacement material at a 15% higher price.

Analysis

The parties have places of business in different Contracting States and expressly selected the CISG. The transaction is a sale of goods. The CISG therefore governs, subject to any domestic issues outside its scope.

The contractual moisture specification is an express conformity requirement under Article 35. The goods are non-conforming. Pacific’s visual inspection did not necessarily reveal latent moisture defects, so the six-week interval may be reasonable in context. The detailed notice was sent promptly after discovery and identifies the defect and affected quantity.

Risk under the CIP term generally passes when the goods are handed to the carrier, but risk allocation does not excuse the seller for goods that were already defective at that time. Pacific must establish that the moisture condition existed before risk passed or resulted from the seller’s breach. Laboratory records, production data, packaging evidence, and expert testimony would be important.

If the defective portion substantially impairs the contractual purpose and cannot be cured promptly, Pacific may argue fundamental breach. However, avoidance of the entire contract may be excessive if the shipment can be separated and the conforming portion remains commercially useful. Replacement purchases may support damages under Article 75 if they were reasonable and made after avoidance or in circumstances satisfying the provision. Pacific must mitigate loss and cannot recover avoidable production losses.

Outcome and learning points

A tribunal might award the reasonable price differential for the affected quantity, consequential losses proven with sufficient certainty, and testing or handling costs, while rejecting unsupported claims for all lost production. The case illustrates five drafting lessons:

1. Technical specifications should include testing methods, sampling rules, tolerances, and acceptance procedures.
2. Incoterms® do not determine conformity or title.
3. Risk passage does not eliminate liability for pre-existing non-conformity.
4. Prompt, specific notice is essential.
5. Contracts should define partial delivery, replacement, cure, and avoidance consequences.

9. Strategic Contract Drafting

A sophisticated international sales clause should address:

• express adoption or exclusion of the CISG;
• governing law for matters outside the CISG;
• arbitration or court jurisdiction;
• language and electronic communication;
• delivery term and named place under Incoterms®;
• title and retention of title;
• technical specifications and testing;
• inspection, acceptance, and notice periods;
• warranties and limitation of liability;
• force majeure and hardship;
• currency, tax, sanctions, export controls, and customs;
• data, cybersecurity, and traceability where relevant; and
• preservation, recall, and product-safety responsibilities.

A model adoption clause is: “This contract is governed by the United Nations Convention on Contracts for the International Sale of Goods. Matters not governed by the CISG shall be governed by the law of [jurisdiction], excluding its conflict-of-laws rules.”

A model exclusion clause is: “The United Nations Convention on Contracts for the International Sale of Goods is expressly excluded. This contract shall be governed by the law of [jurisdiction], excluding its conflict-of-laws rules.”

The parties may also modify particular effects of the CISG, for example by replacing the default notice period with a commercially workable inspection protocol. Such modifications should be explicit and internally consistent.

10. Governance, Ethics, and Contemporary Issues

International sales law operates within broader regulatory systems. A seller may face sanctions, export-control, anti-bribery, forced-labor, environmental, product-safety, and modern-slavery requirements. Contractual compliance language should not be treated as a substitute for due diligence.

Supply-chain disruption has increased the importance of force majeure, alternative sourcing, allocation clauses, and business-continuity evidence. Courts and arbitral tribunals generally distinguish genuine impediments from ordinary increases in cost or reduced profitability.

Artificial intelligence can assist with contract comparison, clause extraction, document classification, anomaly detection, and multilingual review. It should not be allowed to determine legal conclusions without qualified human verification. Errors in identifying the governing law, delivery term, notice deadline, or technical specification can create substantial losses. Governance should include version control, source validation, confidentiality safeguards, and an auditable record of human approval.

Challenges and Limitations

The CISG promotes uniformity, but uniform interpretation is incomplete. Courts may differ in their treatment of good faith, fundamental breach, notice, hardship, software, and damages. Translation differences and domestic procedural rules can influence outcomes. The Convention also leaves important topics outside its scope, requiring coordination with domestic law, Incoterms®, arbitration rules, the New York Convention, and sector-specific regulation.

The practical answer is not simply to choose the CISG or reject it. Parties should evaluate the transaction’s product, jurisdictions, evidence, bargaining power, dispute forum, supply-chain risks, and need for tailored rules. Clear drafting remains more valuable than reliance on labels such as “international standard terms.”

Chapter Summary

The CISG provides a principal framework for international contracts for the sale of goods. Its application depends on the parties’ places of business, the nature of the transaction, and any valid exclusion. It regulates formation, delivery, conformity, inspection, notice, risk, remedies, damages, mitigation, and exemption, while leaving validity, title, personal injury, and several procedural matters to other law.

The most important practical disciplines are to identify the governing regime, draft precise specifications, select and name the delivery term correctly, establish inspection and notice procedures, preserve evidence, and coordinate remedies with force majeure and dispute-resolution clauses. Compared with domestic law such as UCC Article 2, the CISG differs particularly in formation, conformity, perfect tender, notice, and remedial structure. Its effectiveness depends on informed party autonomy and careful integration with domestic regulation and commercial practice.

Key Terms

CISG: United Nations Convention on Contracts for the International Sale of Goods.

Contracting State: A state that has become party to the CISG.

Place of business: The commercial establishment most closely connected with the contract and its performance.

Offer: A sufficiently definite proposal indicating an intention to be bound upon acceptance.

Acceptance: A statement or conduct indicating assent to an offer.

Fundamental breach: A breach causing substantial detriment that was foreseeable to the breaching party.

Conformity: Compliance of goods with contractual and applicable CISG requirements.

Particular purpose: A special use made known to the seller on which the buyer reasonably relies.

Inspection: Examination of goods within as short a period as practicable.

Notice of non-conformity: Communication identifying a defect within a reasonable time after discovery.

Risk of loss: Responsibility for accidental loss or damage to goods.

Incoterms®: Standardized trade terms allocating delivery tasks, costs, and risk.

Avoidance: Termination of the contract under the CISG’s statutory conditions.

Cover: A reasonable substitute purchase or resale after breach.

Mitigation: The injured party’s duty to take reasonable steps to reduce loss.

Article 79 exemption: Relief from damages for qualifying impediments beyond a party’s control.

Party autonomy: The parties’ power to exclude or vary the CISG.

Battle of the forms: Conflicting standard terms exchanged during contract formation.

Force majeure: Contractual allocation of extraordinary events preventing performance.

Review Questions

5 Short Answer Questions

1. What factors determine whether the CISG applies to a sale?
2. What makes a proposal an offer under Article 14?
3. What are the buyer’s inspection and notice obligations?
4. What is the relationship between Incoterms® and the CISG?
5. What is meant by mitigation of loss?

5 Long Answer Questions

1. Explain the CISG’s rules on conformity of goods and compare them with domestic warranty rules.
2. Analyze the formation of a contract where the acceptance contains additional terms.
3. Discuss risk transfer in shipment and destination transactions.
4. Evaluate the buyer’s and seller’s remedies for fundamental and non-fundamental breach.
5. Explain why a business might adopt, modify, or exclude the CISG.

3 Analytical / Application Questions

1. A buyer discovers a latent defect four months after delivery and sends detailed notice two days later. Analyze whether the buyer can pursue CISG remedies.
2. A seller faces a 40% increase in raw-material costs and invokes Article 79. Assess the argument and identify relevant contractual alternatives.
3. Draft a short governing-law and dispute-resolution provision for a cross-border machinery sale, identifying how you would address the CISG, technical acceptance, and arbitration.

Multiple Choice Questions with Answers

Question 1

Which factor is generally decisive in determining whether the CISG applies to a corporate sale?

A. The nationality of each company’s shareholders

B. The parties’ places of business and the applicable jurisdictional connection

C. The currency used for payment

D. The nationality of the carrier

Correct Answer: B. The parties’ places of business and the applicable jurisdictional connection

Question 2

Under CISG Article 35, goods must generally be fit for a particular purpose when the purpose was made known and the buyer reasonably relied on the seller’s judgment. Which is the best example?

A. The buyer secretly uses the goods for an unusual purpose

B. The seller expressly disclaims every specification

C. The buyer tells the seller the intended use and relies on the seller’s recommendation

D. The goods are sold without any description

Correct Answer: C. The buyer tells the seller the intended use and relies on the seller’s recommendation

Question 3

What is the principal function of the buyer’s notice under CISG Article 39?

A. To create the original contract

B. To identify the lack of conformity within a reasonable time

C. To transfer risk back to the seller automatically

D. To establish ownership of the goods

Correct Answer: B. To identify the lack of conformity within a reasonable time

Question 4

Which statement best describes Incoterms®?

A. They comprehensively replace the CISG

B. They determine criminal liability for defective goods

C. They allocate delivery tasks, costs, and risk at defined points

D. They always determine when title passes

Correct Answer: C. They allocate delivery tasks, costs, and risk at defined points

Question 5

A response to an offer changes the price and delivery date. Under the CISG, this response will usually be treated as:

A. An unconditional acceptance

B. A rejection and counteroffer because the changes are material

C. Silence

D. A completed resale transaction

Correct Answer: B. A rejection and counteroffer because the changes are material

Question 6

Which remedy is most closely associated with a reasonable substitute purchase after breach?

A. Cover damages under Article 75

B. Automatic punitive damages

C. Criminal restitution

D. Title registration

Correct Answer: A. Cover damages under Article 75

Question 7

What does Article 77 generally require of an injured party?

A. To maximize the other party’s profit

B. To take reasonable steps to mitigate loss

C. To waive all damages

D. To avoid examining the goods

Correct Answer: B. To take reasonable steps to mitigate loss

Question 8

Which issue is generally outside the CISG’s substantive scope?

A. Delivery of goods

B. Conformity of goods

C. Validity of the contract for fraud or incapacity

D. Buyer’s payment obligation

Correct Answer: C. Validity of the contract for fraud or incapacity

Question 9

A party relying on Article 79 must generally prove that the impediment was:

A. A foreseeable increase in ordinary business costs

B. Beyond its control and not reasonably avoidable or overcome

C. Caused by the other party in every case

D. Approved by a trade association

Correct Answer: B. Beyond its control and not reasonably avoidable or overcome

Question 10

Which drafting language most clearly excludes the CISG?

A. International law applies

B. The seller’s country’s law applies

C. The CISG is expressly excluded and the law of [identified jurisdiction] governs

D. The parties will comply with trade practice

Correct Answer: C. The CISG is expressly excluded and the law of [identified jurisdiction] governs