CISG: advantages and disadvantages for German exporters

Few building blocks of German sales and purchasing terms are as widespread as the sentence: “The CISG is excluded.” And few are as rarely reasoned. For legal advisers, recommending the exclusion without examining it is regarded in legal writing as an error of professional advice. For German exporters, the reflex is usually a mistake. It trades a sales law written for cross-border trade for a law that was never designed for it, and it gives away drafting freedom that the German BGB and HGB do not offer. A critical, case-by-case assessment almost never takes place.¹

What the CISG is and when it applies

The United Nations Convention on Contracts for the International Sale of Goods of 11 April 1980 (CISG) has been part of German law since 1 January 1991 and is the special statute for the international sale of goods. Within its scope it takes precedence over the BGB and HGB.² It covers sales contracts for goods between parties with places of business in different states, including contracts for goods yet to be manufactured (Article 3 CISG). It applies in two situations: where both parties are established in contracting states (Article 1(1)(a) CISG), or where the law of a contracting state governs the contract, whether by choice of law or through private international law (Article 1(1)(b) CISG). Before German courts this second situation does not cover the law of states that have excluded it by a reservation (Article 95 CISG). These include the United States, China (but not for Hong Kong), Singapore, and Slovakia. With contract partners based in those states, the CISG still applies under the first situation. The CISG’s clear rules served as a model for the reform of the German law of obligations.

Three consequences are underestimated in practice:

• It applies of its own force. Where an international sale of goods falls within its scope, the court of a contracting state applies the CISG without any party having to invoke it.
• Exports are practically always covered. Without a valid choice of another law, German export transactions are governed by the CISG, via Article 1(1)(b) CISG in conjunction with Article 4(1)(a) of Regulation (EC) No 593/2008 (Rome I Regulation) even where the buyer is located in a non-contracting state.
• Choosing German law makes the CISG apply even toward non-contracting states. Whoever agrees on German law with a buyer in the United Kingdom has thereby agreed on the CISG, because it is part of German law. For the same reason, the simple clause “German law applies” does not exclude the CISG but confirms it.³

Application in 97 contracting states

The CISG has 97 contracting states (as of 17 July 2026, current list at UNCITRAL), among them 16 of the 20 strongest trading nations in the world. Contracting states include the United States, China, Japan, Brazil, Türkiye, Switzerland, and every EU member state except Ireland and Malta. An estimated 80 percent of world trade falls within its scope. Since 1 December 2022 the CISG also extends to contracts with parties in Hong Kong; for contracts concluded before that date it remains inapplicable there.⁴ The most recent accessions are Saudi Arabia and Rwanda (2023, contracting states since 2024), although Saudi Arabia has excluded Articles 25–88 CISG, the substantive core, by a reservation under Article 92 CISG.

Non-members, by contrast, include the United Kingdom, India, South Africa, and Nigeria, as well as Indonesia, Thailand, Malaysia, and the United Arab Emirates. In the United Kingdom, ratification has been debated for decades; until at least 2005 it failed for lack of interest and out of concern for London’s standing as an arbitration venue.⁵ With contract partners there, the CISG nevertheless applies as soon as the parties choose German law.

Read the map and the pattern is plain. In trade with Europe, North and South America, and East Asia, the CISG is the default. The gaps lie mainly in South Asia, Africa, and parts of the Arab world; there, the choice of law matters all the more.

The reflex of excluding the unknown

Abraham Maslow’s hammer describes German contract practice around the CISG with uncanny accuracy. The BGB and HGB are the familiar tools, so every international transaction is worked with them, and the CISG is excluded by reflex and by boilerplate.⁶ Where a reason is given at all, it comes down to the old “the devil you know is better than the devil you do not know”. One’s own familiar law looks safer than the foreign, untested one.⁷ With the Convention’s content this has little to do. The exclusion is mostly explained by unfamiliarity, hardly ever by unacceptable rules; by now, practitioners report a clear countermovement of companies deliberately switching their foreign trade to the CISG.⁴

What is more, the exclusion regularly fails. Three typical ways:

• The standard terms containing the exclusion clause are never validly incorporated for lack of transmission, and the CISG applies despite the clause (in detail: “How to incorporate standard terms internationally”).
• Both sides use standard terms that each exclude the CISG but choose different national laws. Such colliding clauses cancel each other out, and the CISG remains applicable (on the battle of forms, see the article “Battle of forms: Whose terms apply?”).
• The choice-of-law clause simply says “German law applies” and thereby confirms the CISG instead of excluding it.

Whoever wants to exclude the CISG and makes a mistake in doing so gets it anyway, without having planned for it and without contract templates that fit.

How little examination sits behind the boilerplate shows wherever parties exclude what would never have applied. I have seen B2B engagement terms of a respected German business law firm that exclude the CISG, and a notarized real-estate purchase agreement between two German companies that does the same. Both lie outside the Convention’s scope from the outset. The CISG governs the international sale of goods, not a law firm’s engagement and not a domestic real-estate deal. Some chamber-of-commerce templates and form books also contain the exclusion without comment.

This is not rhetorical exaggeration. Recommending the exclusion without having examined its consequences for recourse, liability, and avoidance is regarded in legal writing as an error of professional advice.⁸ In my view the error begins one step earlier, with the failure to engage at all. If your adviser recommends the exclusion, ask for the reasons. “We have always done it this way” is not one.

How costly the reflexive reach for national law can be is shown by the dispute between the European Commission and AstraZeneca over the COVID-19 vaccine, a supply contract with an estimated volume of around EUR 870 million. In its urgent ruling of 18 June 2021, the Tribunal de première instance francophone de Bruxelles relied exclusively on Belgian domestic law and did not mention the CISG at all. Yet there are good reasons that the CISG applied: vaccine doses are goods, both sides were established in contracting states, and the choice of “Belgian law” does not exclude the CISG but includes it. At the very least the court should have examined its applicability. Even in one of the largest procurement contracts in recent European history, the court overlooked the governing uniform law. That makes unfamiliarity with the CISG a fundamental problem.⁹

Both clauses only work if they are validly incorporated into the contract; in international business that means, as a rule, transmitting your standard terms.

Advantages and disadvantages for German exporters

For the exporter, that is, the seller, the balance is clear. The overview compares the position under the German BGB/HGB with the CISG:

What matters most is drafting freedom. Under Article 6 CISG, the parties may derogate from or vary almost any provision of the Convention; the CISG is dispositive down to nearly its last rule. Here the CISG differs most clearly from German law. German case law on the control of standardized clauses (AGB law) is particularly strict by international comparison, particularly in commercial dealings. Hardly any other country controls contracts between businesses this tightly, often at odds with commercial practice, for instance in drawing the line to an individually negotiated term far too narrowly (see “No individual agreement”).¹⁰ This control does not affect the odd exception but almost the entire body of clauses. Apart from the description of performance (the machine, say) and counter-performance (the price), a commercial contract consists almost entirely of standardized clauses, in my estimate around 95 percent. It is precisely these clauses that German law subjects to the strict control of Sections 307 et seq. BGB, on which liability, rescission, and exclusion clauses fail in large numbers. Under the CISG this is different. What the Convention governs, the parties may shape, and the benchmark for the content review is then the more flexible CISG model, not the strict one of the BGB.

Avoidance and grace periods compared with the BGB

Avoidance of the contract is the exception under the CISG, not the rule. Under the CISG, a troubled contract stays in force wherever possible; avoidance is the last resort. The buyer can only avoid the contract for a fundamental breach, or for non-delivery despite a grace period (Article 49(1) CISG). Where the seller has delivered, the buyer must declare avoidance within a reasonable time (Article 49(2) CISG). For rescission under the BGB, by contrast, a curable defect and an expired period for cure are in principle enough; only insignificant breaches bar rescission (Section 323(5) BGB). What that requires in detail, from the cure period and the place of cure to the materiality threshold, is set out in “How to rescind a purchase contract correctly”.

The BGH speaks of the Convention’s tendency to push back avoidance in favor of the other remedies;¹¹ even missing the delivery date is, taken alone, regularly not a fundamental breach.¹² In the Cologne case, the buyer was the Federal Republic of Germany itself. It had procured protective masks from a Chinese supplier in a pandemic open-house procedure. It lost its right to avoid the contract because it was too late in declaring avoidance over masks it considered defective (Article 49(2)(b)(i) CISG). Comparably strict avoidance requirements could not even be validly agreed in standard terms under German law.¹³

This saves exporters money. It matters first of all for custom-built goods. A machine engineered for one specific customer can hardly be sold elsewhere after the deal is unwound. And it matters wherever transport costs are high and distances long; unwinding a contract across continents is the most expensive outcome a defect dispute can have.

Recourse on a resale to consumers

The mandatory German supplier recourse disappears. That is the prevailing view in legal writing; a dissenting view would apply Section 478 BGB under the CISG through Article 4(a) CISG.¹⁴ If a customer in another EU member state resells the goods to consumers, a German supplier operating under the BGB is liable under Sections 445a, 477, and 478 BGB: reversed burden of proof in favor of the customer, no-fault reimbursement of expenses, no grace-period requirements, and most of it mandatory. An exporter who agrees on German law with the CISG excluded subjects such export business to these mandatory rules as well. Under the CISG, by contrast, the buyer bears the burden of proof once it has accepted the goods without giving notice of a defect. It must then prove that they were already non-conforming when the risk passed (Article 36 CISG).¹⁵ The buyer must give notice of the lack of conformity within two years of actual handover at the latest, unless this time limit is inconsistent with a contractual period of guarantee (Article 39(2) CISG). Liability is open to contractual design.¹⁶

The notice period under Article 39(1) CISG, with its rule of thumb of about one month, is admittedly more generous than the notice without undue delay that Section 377 HGB requires.¹⁷ Unlike Section 377 HGB, however, the CISG also requires notice of defects in title (Article 43 CISG). The benchmark for conformity is more seller-friendly as well. Article 35 CISG looks first to the contract and, unless the parties have agreed otherwise, to objective criteria such as fitness for ordinary use; for product standards, those of the seller’s country apply as a rule.¹⁸ Section 434 BGB, by contrast, also looks to the buyer’s expectations.

Exclusion clauses for simple negligence

In my view, a genuine limitation of liability becomes possible. Under German standard-terms law, liability for simple negligence in conditions of sale can be limited freely only for non-essential duties; for essential contractual duties (cardinal duties), liability for foreseeable damage typical of the contract remains mandatory (Section 307 BGB).¹⁹ The economically important risks can therefore hardly be limited in standard terms. Under the CISG, limitation and exclusion clauses fall under the freedom of contract of Article 6 CISG. The validity limits of national law still apply, for instance in cases of intent, gross negligence, or breach of an essential contractual duty. They must, however, be applied with regard to the international character of the contract and the principles underlying the CISG, freedom of contract and reasonableness among them.²⁰ If the review under Section 307 BGB is consistently aligned with the CISG benchmark, a genuine limitation of liability becomes achievable, at least for simple negligence. In German legal writing I advocate this position almost alone so far.²¹ For exporters this may be the single strongest reason to keep the CISG.

Insolvency, tort, and the conflict of laws

Within its scope, the CISG displaces conflicting national law as the special statute, even mandatory law; whether a contract or a clause is valid, however, remains a matter for national law (Article 4(a) CISG). In a case Piltz reports from his own practice, a Canadian buyer had become insolvent. Against the insolvency administrator, the German supplier successfully relied on the right of retention under Article 71 CISG and on the priority of treaties under the Canadian constitution. Under the BGB there would have been no basis for that argument.²² According to the French Cour de cassation, the CISG also bars concurrent national tort claims within its scope for losses arising from defective performance – one liability risk fewer. Internationally, the question is disputed.²³ Add the conflict-of-laws argument. Some states do not recognize a choice of law at all or only with restrictions, Brazil for instance only in combination with an arbitration agreement. Where the CISG itself governs a question and applies simply because both parties are based in contracting states, that private-international-law exercise is unnecessary.

There is also an advantage that no national legal order offers. The text of the CISG has stood unchanged since it entered into force. National sales laws, by contrast, are amended continually, in Germany for instance through the 2002 reform of the law of obligations and the BGB amendments since, and likewise elsewhere. Whoever chooses the CISG ties into a text that has been the same for more than four decades and need not adjust their contracts with every legislative change to the national law that would otherwise apply. That provides long-term planning certainty.

The remaining disadvantages are real but contained:

• No-fault liability can be managed by contract, in my view also through a limitation of liability in standard terms.
• In any event the seller is only liable for losses foreseeable at the conclusion of the contract (Article 74 CISG) and is exempt for impediments beyond its control (Article 79 CISG).²⁴
• Within its scope the CISG prevails; what it does not govern, such as limitation periods, set-off with claims from outside the sales contract, or penalty clauses²⁵, is governed by the national law applicable alongside it, which for German exporters without a different choice is German law.

That is why every CISG choice of law needs a deliberately chosen supplementary national law, and the combination matters. Whoever wants to be certain that their liability clauses are not measured against the German review of standard terms after all can pair the CISG with a foreign law as a supplement, for instance Swiss law together with an arbitration clause seated in Switzerland.²⁶

One genuine disadvantage is that courts in different countries read the same provisions differently, colliding standard terms for instance (German courts follow the knock-out rule, US courts the mirror-image rule); see the article “Battle of forms: Whose terms apply?”. The reason is that judges interpret the uniform law according to their own national legal understanding; that can create legal uncertainty. It can be managed in two ways: through clear, interpretation-proof contract clauses, and through the tactical choice of forum or arbitral seat, which decides which interpretive tradition applies in the first place. Whoever calls the CISG incalculable on that account overlooks how much case law exists. On CISG-online, 8,036 decisions are published and freely accessible, among them 6,999 court decisions from 75 jurisdictions and 1,037 arbitral awards (as of 6 October 2026). Germany alone accounts for more than 900 of them; German courts, from the Federal Court of Justice down to the courts of appeal, have applied the CISG more often than the courts of almost any other country, and their decisions are freely available in German. Contested questions of interpretation are worked through by the CISG Advisory Council, an international expert body whose opinions are cited by courts worldwide.

The reverse direction is even clearer. In purchasing, the CISG gives the German importer a no-fault damages claim against its supplier. Under the BGB such a claim as a rule exists only where the contract provides for stricter liability, for instance through a guarantee (Section 276(1) sentence 1 BGB). It cannot be validly agreed in German standard terms. For international purchasing, the CISG is simply unmatched.¹³

When exclusion is justifiable

There are settings in which exclusion is a reasoned decision:

• where a group has standardized worldwide on another contract regime and has the bargaining power to enforce it;
• where contract templates are so deeply rooted in BGB concepts that a short-term switch creates more risk than it removes;
• or where the contract falls outside the Convention’s scope anyway because assembly and service obligations predominate (Article 3(2) CISG) and a clarification avoids disputes.

What these cases share: they are the result of an examination, not a boilerplate block. Whoever excludes should do it effectively and choose the applicable law deliberately.

What you should do

1. Take stock. Check where your standard terms and contracts exclude the CISG, and whether there is a reason beyond habit.
2. Align your exports with the CISG. Agree on its application expressly, framework agreements included, and use the freedom it grants: limit liability (safely with a foreign supplementary law), sharpen the notice regime, fix the supplementary national law.
3. Scrutinize purchasing all the more. As a buyer you benefit from your supplier’s no-fault liability; excluding the CISG in purchasing terms usually hurts yourself.
4. Exclude only with reasons. If so, do it expressly (“to the exclusion of the CISG”) and with validly incorporated standard terms, otherwise the CISG applies anyway; see the article “How to incorporate standard terms internationally”.
5. Train sales and procurement. Day-to-day business decides what applies: offers, orders, order confirmations.

Freely accessible sources

Nobody has to apply or avoid the CISG on a hunch; the essential working tools are free:

• CISG-online: 8,036 decisions in full text, plus materials and full-text search (as of 6 October 2026).
• UNCITRAL status page: the current list of contracting states, reservations included.
• CISG Advisory Council: opinions on contested questions of interpretation.
• UNCITRAL Digest: a systematic case-law overview for every article of the Convention.

Conclusion

The CISG is not an exotic special regime but the default statute of German exporting: 97 contracting states, automatic application, nearly four decades of case law. For sellers it is better than the BGB/HGB on the points that decide disputes, from avoidance as the exception, to the mandatory recourse that falls away, to the wider drafting freedom in standard terms. Its disadvantages can be managed, its gaps are known. The right order is therefore not “exclude it because you do not know it”, but to examine, draft, and decide deliberately. I handle that examination for exporters before they send their next order confirmation.

Frequently asked questions

What is the CISG?

The United Nations Convention on Contracts for the International Sale of Goods (CISG) is a 1980 UN convention with uniform rules for international sales contracts. It has been part of German law since 1991 and, as the special statute for international sales of goods, takes precedence over the German BGB and HGB. It currently has 97 contracting states, including almost all of Germany’s major trading partners.

Does the CISG apply automatically?

Yes. Courts in contracting states apply it of their own motion whenever a sales contract between parties from different states falls within its scope. German export business is regularly governed by the CISG even without a choice of law, and even where the buyer is located in a non-contracting state, because private international law leads to German law and with it to the CISG. It also applies where the parties choose German law, even with a contract partner in the United Kingdom.

Does the clause ‘German law applies’ exclude the CISG?

No. The CISG is part of German law. Under settled case law, choosing German law confirms the CISG rather than excluding it. Exclusion must be explicit, for instance: ‘German law applies, to the exclusion of the CISG.’ And the clause only works if it has been validly incorporated into the contract.

Which states have joined the CISG?

97 states (as of 17 July 2026), including the United States, China, Japan, Brazil, Türkiye, and every EU member state except Ireland and Malta. Since 1 December 2022 the CISG also extends to Hong Kong. Non-members include the United Kingdom, India, South Africa, Nigeria, Indonesia, and the United Arab Emirates.

Should German exporters exclude the CISG?

In most cases, no. For sellers, the CISG is more favorable than the BGB and HGB on the points that matter: avoidance of the contract is the exception, the mandatory German supplier recourse does not apply, and standard terms are measured against the more flexible CISG benchmark. Disadvantages such as strict liability can be managed by contract drafting. Exclusion makes sense only as a reasoned case-by-case decision.

Notes

1. See Feldhusen/Niebling/Poleacov, AGB-Kommentar, 5th edition 2026 (forthcoming), UN-Kaufrecht (CISG); on how widespread the reflex is, Meyer, RabelsZ 85 (2021), 357. ↩

2. BGH, judgment of 25 November 1998 – VIII ZR 259/97. ↩

3. BGH, judgment of 28 May 2014 – VIII ZR 410/12; BGH, judgment of 7 December 2017 – VII ZR 101/14; Piltz, ZVertriebsR 2023, 17. ↩

4. Piltz, NJW 2025, 2524. ↩^{1 2}

5. Moss, Journal of Law and Commerce 25 (2005–06), 483 (483, 485). ↩

6. Feldhusen/Niebling/Poleacov, ibid. ↩

7. Cf. Koch, NJW 2000, 910. ↩

8. Piltz, ZVertriebsR 2017, 138 (142): the exclusion is “hardly defensible any more” unless convincingly reasoned, referring to Schroeter, UN-Kaufrecht und Europäisches Gemeinschaftsrecht, 2005, p. 521, and Janssen, AW-Prax 2003, 347 et seq. ↩

9. Cf. Janssen/Wahnschaffe, EuZW 2021, 877; Köhler, ConflictofLaws.net 2021. ↩

10. For a comparison with France, England, Austria, and Switzerland, Leuschner, ZEuP 2017, 335 (369 et seq.). ↩

11. BGH, judgment of 24 September 2014 – VIII ZR 394/12. ↩

12. OLG Köln, judgment of 9 January 2025 – 8 U 46/23, complaint against the refusal of leave to appeal rejected by BGH, order of 31 March 2026 – VIII ZR 23/25; OLG Stuttgart, judgment of 12 January 2024 – 5 U 65/23: different where the delay persists or further breaches accumulate. ↩

13. Piltz, ZVertriebsR 2017, 138 (141). ↩^{1 2}

14. Piltz, ZVertriebsR 2023, 17 (20 et seq.) with further references; differing view Graf von Westphalen, EuZW 2022, 149 (155 f.). ↩

15. BGH, judgment of 9 January 2002 – VIII ZR 304/00, reasons, part II 2 a. ↩

16. Piltz, ZVertriebsR 2023, 17. ↩

17. BGH, judgment of 3 November 1999 – VIII ZR 287/98; the CISG Advisory Council stresses in Opinion No. 2 that the circumstances of the case always control, not fixed periods. ↩

18. Piltz, ZVertriebsR 2023, 17 (19). ↩

19. BGH, judgment of 11 November 1992 – VIII ZR 238/91. ↩

20. CISG Advisory Council, Opinion No. 17, Rules 2 and 4. ↩

21. Feldhusen/Niebling/Poleacov, ibid. ↩

22. Piltz, ZVertriebsR 2017, 138 et seq. ↩

23. Cour de Cassation, decision of 17 May 2023 – no. 22-16.290, CISG-online 6359; on the debate, Schlechtriem/Schwenzer/Schroeter/Hachem, Commentary on the UN Convention on the International Sale of Goods (CISG), 5th edition 2022, Article 4, para. 19. ↩

24. CISG Advisory Council, Opinion No. 7. ↩

25. BayObLG, order of 26 June 2024 – 101 Sch 116/23 e. ↩

26. Piltz, ZVertriebsR 2017, 138 (142). ↩

Reference: Poleacov, P. (2026). CISG: advantages and disadvantages for German exporters. INN.LAW. https://inn.law/en/perspectives/cisg-for-german-exporters/

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