Purpose
For a specific transaction, the skill clarifies whether the HGB or the BGB applies and which merchant-specific special rules of Book Four of the HGB alter the BGB position. The focus is the duty to examine and give notice of defects in a commercial sale under §§ 377/378 HGB, the failure of which means the loss of warranty rights – one of the most common and most consequential client misconceptions in practice in B2B transactions.
Inputs
- Parties (status: merchant yes/no under §§ 1 et seq. HGB)
- Subject matter of the transaction (sale, contract for work, contract for work and materials, services, agency, suretyship, contractual penalty, …)
- Conclusion of contract (no particular form, by telephone, email, commercial letter of confirmation?)
- In the case of a defect issue: time of delivery, time of discovery of the defect, type of defect (patent/latent), notice of defect given so far (form, time, content)
- specific question (Does the HGB apply? Was the notice period observed? Is silence acceptance? Does the clause apply without form?)
Sub-agent architecture
The researcher provides §§ 343–384 HGB, BGH case law on § 377 HGB "without undue delay", the commercial letter of confirmation and commercial custom, as well as standard commentaries. The drafter examines norm by norm in the style of a legal opinion or judgment what changes compared with the BGB and, if necessary, drafts a notice of defect. The reviewer checks the notice period, burden of proof and completeness.
Procedure
1. Preliminary question: Is there a commercial transaction?
- § 343 HGB: Commercial transactions are all transactions of a merchant that belong to the operation of his commercial business.
- § 344 HGB: Presumption – in case of doubt, the transactions undertaken by the merchant belong to his commercial business.
- Unilateral vs. bilateral commercial transaction: For §§ 343 et seq. HGB, frequently only unilateral merchant status is decisive (§ 345 HGB), but for § 377 HGB, bilateral commercial transaction.
2. Synoptic overview: HGB special rules vs. BGB
| Norm HGB | Content | Deviation from the BGB |
|---|---|---|
| § 346 | Commercial customs are to be taken into account. | Goes beyond § 157 BGB: commercial customs have effect even without the will of the parties. |
| § 347 | Diligence of a prudent merchant. | Stricter standard of fault than § 276 BGB. |
| § 348 | The amount of the contractual penalty can not be reduced under § 343 BGB. | Judicial reduction excluded. |
| § 349 | Defense of prior recourse in the case of suretyship is excluded. | Self-debtor suretyship by operation of law. |
| § 350 | In commercial transactions: written form requirements for suretyship, promise of debt, acknowledgment of debt (§§ 766, 780, 781 BGB) omitted. | freedom of form in B2B. |
| § 352 | interest rate 5 % p.a. in the case of a commercial transaction for both parties. | BGB § 246: 4 %. |
| § 353 | Default interest from the date of maturity. | Extension compared with § 288 BGB. |
| § 354 | Presumption of remuneration for services of a merchant. | Unlike § 612 BGB. |
| § 354a | Prohibition of assignment in the case of a monetary claim in a commercial transaction ineffective vis-à-vis the first debtor – the assignment takes effect, the debtor may pay the former creditor. | Unlike § 399 BGB. |
| §§ 362, 363 | Silence of a merchant in response to a request for business management is deemed acceptance (§ 362 HGB); commercial letter of confirmation (customary law, often close to § 363 HGB). | Unlike § 151 BGB. |
| § 366 | Acquisition in good faith from a non-owner merchant also with regard to power of disposal. | Extension compared with §§ 932 ff. BGB. |
| § 369 | Commercial right of retention – broader than § 273 BGB, with power of realization. | Stronger means of pressure. |
| §§ 377/378 | Duty to examine and give notice of defects in the case of a commercial sale for both parties. | Unlike a BGB sale: no duty to give notice of defects between private individuals. |
3. Commercial letter of confirmation (customary law / §§ 362, 363 HGB)
Requirements (Hopt, Baumbach/Hopt HGB, Einl. § 343 marginal no. 25 ff.):
- Preceding contract negotiations
- Both parties are merchants (or similar to merchants, settled case law
[unverifiziert]) - The letter is sent without undue delay
- The letter confirms the result of the negotiations (deviations only to an insignificant extent)
- Silence of the recipient is deemed consent – not speaking out leads to being bound by the content of the letter
Special case of double confirmation: in the case of contradictory letters, the first applies – controversial, source: K. Schmidt, MüKoHGB, Einl. § 343 marginal no. … [unverifiziert].
4. § 377 HGB – duty to examine and give notice of defects in the case of a commercial sale
Core duty for every B2B practitioner. Failure to do so leads to the loss of all warranty rights (subsequent performance, withdrawal, reduction, damages instead of performance – but not damages under a guarantee or tort).
Requirements
- Commercial transaction for both parties (§ 343 HGB for both sides)
- Commercial sale – including contract for work and delivery of materials, controversial whether contract for work and services (prevailing view not directly, but tendency toward analogous application, Hopt loc. cit.
[unverifiziert]) - Delivery of the goods
Legal consequences / sequence
| Defect category | Duty | Period |
|---|---|---|
| obvious defect | prompt examination + notice of defects (§ 377 (1) HGB) | "promptly" within the meaning of § 121 BGB – without culpable delay; interpretation depending on the type of goods |
| hidden defect | Complaint must be made without undue delay after discovery (Section 377(3) of the German Commercial Code (HGB)) | "without undue delay" after actual discovery |
| Aliud / quantity deviation | treated equally (Section 378 HGB), provided the deviation is not so obvious that the seller could not have expected approval | as above |
Form of the complaint: no particular form required, but content requirement: the defect must be described specifically by type and extent – blanket complaints ("goods not in order") are not sufficient (German Federal Court of Justice (BGH) [unverifiziert – prüfen in juris]; Hopt loc. cit. Section 377 marginal no. 51).
Burden of proof: the buyer must prove that the complaint was timely and proper – therefore recommendation: text form with proof of delivery (email with read receipt; registered mail; delivery by courier).
Rule of thumb for "without undue delay" (settled case law [unverifiziert]): depending on the type of goods, 1–3 working days for inspection, a further 1–2 working days for the complaint. Shorter for perishable goods, longer for capital goods with commissioning testing. In each individual case, always taking into account the size of the business and customary practice.
Exceptions to the loss of rights:
- Bad faith of the seller (Section 377(5) HGB) – then warranty rights remain despite the missed deadline.
- Assumption of a guarantee – guarantee claims remain unaffected.
- Tort claims (Sections 823 et seq. BGB) – independent of Section 377 HGB.
5. Practical check scheme in the specific case
1. Sind beide Parteien Kaufmann (§§ 1 ff. HGB)?
ja → weiter; nein → BGB ist Maß
2. Welche HGB-Norm könnte greifen?
– §§ 350, 352, 354a: vertragsgestaltend
– §§ 362, 363: Bestätigungsschreiben/Schweigen
– § 366: Gutgläubiger Erwerb
– §§ 377/378: Rügepflicht
3. Tatbestandsvoraussetzungen prüfen, Rechtsfolge benennen
4. Folge für Mandant: Was ändert sich gegenüber BGB?
Sources and citation style
Mandatory: ../../../references/zitierweise.md.
Statute
- Section 343 HGB (commercial transaction)
- Section 344 HGB (presumption)
- Section 346 HGB (commercial custom)
- Section 347 HGB (commercial diligence)
- Section 348 HGB (contractual penalty)
- Section 349 HGB (suretyship)
- Section 350 HGB (freedom from form requirements)
- Section 352 HGB (interest 5%)
- Section 354a HGB (exclusion of assignment)
- Section 362 HGB, Section 363 HGB (silence)
- Section 366 HGB (acquisition in good faith)
- Section 369 HGB (right of retention)
- Section 377 HGB, Section 378 HGB (duty to inspect/complain)
- Section 121 BGB (without undue delay)
Commentaries
- Hopt, in: Baumbach/Hopt HGB, 42nd ed. 2023, Section 377 marginal no. 1 et seq., Introduction Section 343 marginal no. 25 et seq. (commercial letter of confirmation)
- K. Schmidt, in: MüKoHGB, 5th ed. 2021, Section 377 marginal no. 1 et seq.
- Grunewald, in: MüKoHGB, 5th ed. 2021, Sections 362, 363 marginal no. 1 et seq.
- Achilles, in: EBJS HGB, 4th ed. 2020, Section 377 marginal no. 1 et seq.
- Brüggemann, in: Staub HGB, 6th ed. 2023, Section 377 marginal no. 1 et seq.
Case law ([unverifiziert – prüfen in juris])
- BGH, judgment of 03.11.1982 – VIII ZR 282/81, NJW 1983, 217 (specificity of the objection)
- BGH, judgment of 30.01.1985 – VIII ZR 238/83 (promptness, rule-of-thumb period)
- BGH, judgment of 25.10.2007 – VII ZR 27/06 (contract for work and § 377 HGB by analogy)
- BGH, judgment of 19.06.2002 – VIII ZR 159/01 (commercial confirmation letter)
Output format
MEMO — HGB oder BGB? Besonderheiten des Handelsgeschäfts
Mandant: <anonymisiert>
I. Sachverhalt (knapp)
II. Frage(n)
III. Kurzantwort (Ein-Satz-Befund)
IV. Rechtliche Bewertung
1. Kaufmannseigenschaft beider Parteien (§§ 1 ff. HGB)
2. Handelsgeschäft (§ 343, § 344 HGB)
3. Einschlägige HGB-Sonderregel(n)
(§§ 346/347/350/352/354a/362/366/369/377/378 — je nach Fall)
4. Abweichung vom BGB / Folge für den Mandanten
V. Gesamtergebnis
VI. Risiken / offene Punkte
🟢 / 🟡 / 🔴 <Einstufung mit Begründung>
– insb. § 377 HGB Rügefrist, Beweislast Rüge
VII. Quellenverzeichnis
(Optional VIII. Entwurf Rügeschreiben § 377 HGB)
Example (excerpt in expert-opinion style, § 377 HGB)
"The client (a merchant within the meaning of § 1 HGB) purchased a batch of rolling bearings from the supplier (also a merchant) on 02.04. This is a bilateral commercial transaction (§ 343 HGB in conjunction with the presumption under § 344 HGB). Accordingly, § 377 HGB applies. The rolling bearings were placed in goods receiving on the day of delivery; upon industry-standard random sampling inspection (Hopt, Baumbach/Hopt HGB, § 377 para. 36), the longitudinal defect on the outer surface would have been detectable within 2 working days. The client did not give notice until 03.05. – that is, after around 4 weeks. Notice was not given without undue delay within the meaning of § 121 BGB. Consequence: The goods are deemed approved (§ 377 para. 2 HGB); claims for subsequent performance, rescission, reduction and damages from warranty are excluded. Claims under a guarantee and § 823 BGB remain reserved. Risk 🔴. Recommendation: Examine whether fraudulent concealment (§ 377 para. 5 HGB) or a guarantee agreement exists; if necessary,consider a tort claim."
Risks / typical mistakes
- Categorically denying § 377 HGB in the case of a contract for work. In the case of a contract for work and materials, directly; in the case of a pure contract for work, disputed/by analogy – do not reflexively reject.
- Blanket objection ("goods not in order") – substantively insufficient, deemed not to have been raised.
- Objection to the wrong addressee / by simple email without proof – burden of proof on the buyer.
- Ignoring the confirmation letter – whoever remains silent is bound, even if the content deviates from the outcome of the negotiations (limit: insignificant deviation; good faith).
- Overlooking § 354a HGB: In B2B transactions, prohibitions on assignment of monetary claims cannot be enforced – this weakens, for example, security agreements.
- § 350 HGB applied incorrectly: Freedom from form requirements applies only to the declarations named in §§ 766, 780, 781 BGB and only in the case of a bilateral commercial transaction, not for statutory written form for other reasons (e.g. § 311b BGB).