The CISG (Vienna Convention) — A TRW Law Practical Guide for Cross-Border Sale of Goods (2025)
By Tahmidur Remura Wahid (TRW) Law Firm — International Trade & Arbitration
The United Nations Convention on Contracts for the International Sale of Goods (CISG)—often called the Vienna Convention—is the primary uniform law for B2B cross-border sale of goods. Adopted in 1980 and in force since 1988, the CISG supplies a modern, neutral framework for offer/acceptance, obligations of seller and buyer, conformity, passing of risk, breach, and remedies. With near-global uptake, a large share of world trade is conducted between businesses in CISG Contracting States.
For in-house teams and counsel negotiating sales or litigating/arbitrating delivery, quality, or payment disputes, knowing when the CISG applies, what it does (and does not) cover, and how to work with or around it is essential.
For related topics, see: International Arbitration at TRW and UNCITRAL/Ad Hoc Arbitration.
1) What the CISG Does—in One Minute
- Who it’s for: B2B sales of goods (not services, not consumer sales).
- When it applies: (i) sellers and buyers have places of business in different States, and (ii) there’s a connection to a Contracting State (either both are in Contracting States, or private international law leads to the law of a Contracting State). Parties can opt out (Article 6).
- What it covers: Contract formation, seller and buyer obligations, conformity, risk of loss, breach and remedies.
- What it excludes: Validity issues (capacity, fraud/duress in the vitiating-consent sense), property/title effects, limitation periods, interest rate (though interest is recoverable), product liability, goods bought for personal use.
2) Why Businesses Choose (or Accept) the CISG
Key Advantages
- Uniformity and predictability: A single, neutral regime reduces forum-shopping fights and cuts conflict-of-laws spend.
- Rich jurisprudence: Thousands of published decisions and commentary provide foreseeability for negotiators and litigators.
- Dispositive (default) rules: Parties can tailor outcomes with contract language; the CISG fills gaps coherently.
- Breach without fault analysis: The CISG’s unitary “breach of contract” lens avoids local doctrinal traps (e.g., distinctions like aliud/peius).
Practical Limitations
- Boundary questions: Scope issues (e.g., mixed goods/services contracts) can still spark disputes.
- Gaps remain: Validity, limitation periods, interest rate, and title effects revert to domestic law or party agreement.
- Variability in interpretation: Terms like “fundamental breach” invite judgment calls—though no more so than many domestic systems.
3) When Does the CISG Apply? (Scope & Opt-Outs)
Territorial/Personal Scope (Article 1)
The CISG applies to sales between parties with places of business in different States where:
- Art. 1(1)(a): both States are Contracting States (autonomous application), or
- Art. 1(1)(b): private international law points to the law of a Contracting State.
Nationality doesn’t matter (Art. 1(3)), nor whether parties are “merchants.” What matters is the place of business known at the time of contracting and the connection to a Contracting State.
Material Scope (Articles 2–5)
Excludes consumer sales, auctions, sales of stocks/shares/negotiable instruments/currency, ships/aircraft, electricity, and liability for death/personal injury. It also doesn’t govern validity or property/title effects.
Party Autonomy (Article 6)
Parties may exclude the CISG entirely or derogate from any of its provisions. To opt out cleanly, draft explicitly; do not rely on a bare “governing law” clause.
TRW drafting tip:
“This contract and any non-contractual obligations arising out of or in connection with it shall be governed by the law of [X] excluding the United Nations Convention on Contracts for the International Sale of Goods (CISG).”
4) Formation: Offer, Acceptance, Battle of Forms
Offer (Article 14)
An offer must be addressed to specific persons, be sufficiently definite (identify goods and implicitly/explicitly fix price or a way to determine it), and show intent to be bound.
Acceptance (Articles 18–22)
Assent may be by statement or conduct; the CISG uses a relatively strict “mirror-image” approach—material additions are a counter-offer (Art. 19). That said, practice and usage (Arts. 8–9) can cure gaps or clarify ambiguity.
Standard Terms
The CISG doesn’t codify incorporation mechanics; tribunals examine course of dealing, trade usages, and communications (Arts. 8–9). For global supply chains, make the T&Cs path of assent unmistakable and attach the text.
5) Seller’s Core Obligations
Delivery, Documents, and Title (Articles 30, 31, 34)
- Place of delivery: default rules hinge on whether the sale involves carriage.
- With carriage, absent agreement, delivery = handing goods to the first carrier (Art. 31(a)).
- Time of delivery: on the date/period fixed, or otherwise within a reasonable time (Art. 33).
- Documents: deliver at the time/place/form required (Art. 34).
Conformity of Goods (Article 35)
Goods must conform to quantity, quality, description, and packaging required by the contract (35(1)); failing that, default fitness standards apply (35(2)) unless excluded by agreement.
Inspection and Notice (Articles 38–39)
- Buyer must examine goods as soon as practicable.
- Buyer must notify the seller of non-conformity, specifying the nature, within a reasonable time after discovery (or when it ought to have been discovered).
- A long-stop of two years from actual handover often applies (Art. 39(2)), subject to contractual guarantees.
Passing of Risk (Articles 66–70; esp. 67)
- With carriage and no named place, risk passes when goods are handed to the first carrier (67(1)).
- If a specific place to hand over to the carrier is agreed, risk passes there.
- Risk never passes until goods are clearly identified to the contract (67(2)).
- Parties often displace defaults with Incoterms—do so expressly to avoid surprises.
6) Buyer’s Core Obligations
Pay and Take Delivery (Articles 53–60)
- Pay at the place/time/manner agreed, or as the CISG supplies by default.
- Take delivery: perform acts reasonably expected (open LC, provide call-offs, appoint carrier, etc.). Failures here can be breaches in their own right.
7) Breach & Remedies: Specific Performance, Damages, Avoidance, Price Reduction
The CISG provides parallel remedial tracks for buyer and seller, designed to be functional and compensatory.
Fundamental Breach (Article 25)
Some powerful remedies (e.g., avoidance, substitute goods) require fundamental breach—a breach causing such detriment as to substantially deprive the aggrieved party of what it was entitled to expect, and foreseeable to the breaching party.
- High threshold: not every deviation is “fundamental.” The analysis is contract- and purpose-specific.
Buyer’s Tools (Articles 45–52)
- Specific performance/repair/substitute goods (subject to fundamental breach for substitutes).
- Avoidance (rescission) if fundamental breach or non-delivery within additional period (Art. 49).
- Price reduction for non-conformity (Art. 50), even without avoidance.
- Damages (Articles 74–77): full compensation for loss, including loss of profit, subject to foreseeability, causation, mitigation.
Seller’s Tools (Articles 61–65)
- Compel payment/acceptance, fix additional time (Nachfrist), and avoid for buyer’s fundamental breach.
- Damages on the same Articles 74–77 basis.
Interest & Limitation
- Interest is recoverable (Art. 78), but the rate is not specified—it’s commonly supplied by the governing law or the tribunal’s discretion.
- Limitation periods are outside the CISG; check chosen law or the Convention on the Limitation Period in the International Sale of Goods if applicable (often not adopted).
8) CISG + Arbitration: How They Interact
International sales disputes routinely land in arbitration. The CISG may apply because:
- Parties choose it expressly (or choose the law of a Contracting State without excluding the CISG), or
- Conflict rules send the case to the law of a Contracting State (Art. 1(1)(b)).
Arbitral tribunals typically:
- Honor party choice first;
- Use objective connecting factors second (closest connection/seat);
- Apply the CISG as substantive law, then fill gaps with the chosen domestic law.
For strategy and seat/rules selection, see International Arbitration at TRW and UNCITRAL Arbitration.
9) Drafting with the CISG in Mind (Whether You Use It or Not)
If You Want the CISG
- Say so (and don’t include a blanket CISG exclusion).
- Pair with Incoterms (2020) to control risk and logistics.
- Nail inspection and notice timelines; specify non-conformity reporting mechanics (format, addressee, content).
- Calibrate warranty scope, testing/acceptance, and remedies hierarchy (repair → replace → refund).
- Set interest methodology (reference rate + margin) and limitation period in the governing law clause.
If You Don’t Want the CISG
- Exclude it expressly and choose a domestic law you know.
- Replicate CISG-like efficiencies you do want (e.g., clear conformity tests, inspection/notice windows, gap-fillers).
- Keep Incoterms—they harmonize the logistics/risk layer regardless.
Battle-of-Forms Hygiene
- Attach T&Cs and secure unequivocal assent (POs, acknowledgments, click-throughs).
- Include merger and prevail clauses; avoid dueling references with no incorporation path.
10) Common Pain Points (and TRW Fixes)
- Silent Opt-In: Parties pick “the law of [Contracting State]” but don’t mention the CISG—it likely applies.
- Fix: State include/exclude CISG expressly.
- Risk Misunderstood: Parties expect domestic risk rules; CISG shifts risk on carrier handover unless terms say otherwise.
- Fix: Align Incoterms and Article 67 outcomes.
- Notice Failures: Buyers lose remedies by late or vague notice.
- Fix: Draft clear notice protocol and calendar short windows.
- Mixed Goods/Services: Installation/commissioning can muddy scope.
- Fix: Split contracts or define CISG scope by percentage/value.
- Interest & Limitation Gaps: Awards stall on rate/period disputes.
- Fix: Hard-code interest and limitation.
- Standard Terms Not Incorporated: “On website” isn’t enough.
- Fix: Attach, reference by version/date, and secure affirmative assent.
11) Quick Reference — CISG Remedies Map
| Scenario | Buyer’s Options | Seller’s Options | Notes |
|---|---|---|---|
| Late delivery | Fix Nachfrist; avoid if still non-performance; damages | Cure within Nachfrist; defend reasonableness | “Reasonable time” standards apply |
| Non-conformity (not fundamental) | Repair/price reduction; damages | Offer cure; challenge timeliness/particularity of notice | Early inspection & notice are critical |
| Fundamental non-conformity | Substitute goods; avoidance; damages | Dispute fundamentality; propose cure | Purpose and foreseeability drive the analysis |
| Buyer won’t take delivery/pay | Compel performance; avoid for fundamentality; damages | Avoid for buyer’s fundamental breach; resell; damages | Keep documentary proof of tender |
12) Sample Clause Starters (Tailor Before Use)
CISG Opt-Out + Incoterms
The parties agree that the CISG does not apply. This Agreement is governed by the law of [X]. Delivery and risk allocation shall be governed by Incoterms® 2020 [Rule, Place]. Buyer shall inspect and notify of any non-conformity within [X] days of delivery, specifying the nature of the defect.
CISG Opt-In with Clarifications
This Agreement is governed by the CISG. Where the CISG is silent, the law of [X] applies. Delivery and risk follow Incoterms® 2020 [Rule, Place]. Interest accrues at [Rate]. Any claim is time-barred after [Y] months from delivery unless a contractual warranty applies.
For dispute resolution options and model arbitration wording, see International Arbitration at TRW and UNCITRAL Arbitration.
13) FAQs
Does choosing “Swiss law” (or any Contracting State law) automatically import the CISG?
Yes—unless you exclude it explicitly.
Can I recover lost profits under the CISG?
Yes, Articles 74–77 allow full compensation, subject to foreseeability and mitigation.
Do Incoterms override CISG risk rules?
If clearly incorporated, Incoterms govern risk, delivery, and costs; they effectively displace conflicting CISG defaults.
What interest rate applies?
The CISG grants interest but doesn’t set the rate. Draft it, or expect tribunals to look to the supplementary governing law or discretion.
Are limitation periods in the CISG?
No. Set your own or rely on the chosen domestic law.
14) Action Checklist (Print-Friendly)
- Decide CISG in or out; draft it clearly.
- Pair with Incoterms 2020 and align logistics/risk.
- Define specs, tests, acceptance, and notice windows.
- Incorporate standard terms with a clear assent path.
- Specify interest and limitation; address warranty and remedy hierarchy.
- If disputes will go to arbitration, add a seat, rules, and language (see International Arbitration at TRW).
How TRW Law Helps
We structure and litigate/arbitrate CISG sales for manufacturers, traders, distributors, and EPC suppliers worldwide:
- CISG contract builds (opt-in or opt-out) with sector-specific playbooks.
- Incoterms + logistics engineering to align risk, cost, and evidence.
- Dispute strategy under ICC, LCIA, SIAC, SCC, and UNCITRAL rules.
- Evidence and damages frameworks that withstand notice and fundamental breach tests.
Explore more: International Arbitration at TRW · UNCITRAL Arbitration.
