Kaufvertrag — Sales Contract under § 433 BGB

The Kaufvertrag — the German sales contract — is the most-used contract type in the BGB and the doctrinal centre of the besonderes Schuldrecht. It governs every transfer of a thing or right against payment of a Kaufpreis, from a cup of coffee at the bakery to a multi-million-euro asset deal. Its general regime sits at §§ 433 ff. BGB; on top of it three specialised sub-regimes layer in consumer protection, commercial-practice rules and an international treaty: the Verbrauchsgüterkauf at §§ 474 ff. BGB, the Handelskauf at §§ 373 ff. HGB, and the Wiener Kaufrecht (UN Convention on Contracts for the International Sale of Goods — CISG). Drafting a Kaufvertrag well means picking the correct sub-regime, observing any applicable form requirement, fixing an enforceable Kaufgegenstand, allocating risk and warranty in line with the statutory floor, and disposing of cross-border treaty defaults that may otherwise apply by operation of law. This page is the drafting reference for the contract type. See also /handbook/de/contracts/werkvertrag.html, /handbook/de/form-requirements.html, /handbook/de/agb-rules.html, /handbook/de/standard-clauses.html, and /docs/eu/germany.html.

Applicable Law

§ 433 BGB sets the type-defining obligations. The Verkäufer owes the Übergabe of the Sache and the Verschaffung des Eigentums free from material and legal defects; the Käufer owes the Kaufpreis and Abnahme of the thing. The double-duty structure of Übergabe plus Eigentumsverschaffung is what distinguishes the Kaufvertrag from related dispositions such as the Schenkung or the Tausch and is the doctrinal hook for Eigentumsvorbehalt clauses discussed below.

Three sub-regimes layer on top of the general rules. The Verbrauchsgüterkauf under § 474 BGB engages whenever an Unternehmer sells a movable Sache to a Verbraucher. It pulls in the consumer-protection apparatus of §§ 474–479 BGB, including the Beweislastumkehr at § 476 BGB — defects that manifest within twelve months from Gefahrübergang are presumed to have been present at Gefahrübergang unless that presumption is incompatible with the nature of the Sache or the Mangel — and severe AGB restrictions on any reduction of statutory warranty (see Prohibited in AGB below). The Handelskauf at §§ 373 ff. HGB engages where the contract is a Handelsgeschäft for both parties under § 343 HGB, that is, where both sides are Kaufleute acting in the course of their trade. It pulls in the Untersuchungs- und Rügepflicht of § 377 HGB: the buyer must inspect the goods unverzüglich after delivery and must notify any Mangel without delay, otherwise the goods are deemed approved and Mängelansprüche are lost (subject to the arglistig-verschwiegen carve-out at § 377 Abs. 5 HGB). The CISG applies kraft Staatsvertrag to contracts between parties whose places of business are in different signatory states (e.g., Germany and most major trading partners) unless the parties have validly excluded it. Inadvertent application of the CISG to a contract drafted under domestic-law assumptions is one of the most common surprises in cross-border B2B and is treated under Common Pitfalls below.

Form Requirements

The default for movable goods is Formfreiheit: a Kaufvertrag under § 433 BGB can be concluded orally, in Textform, in Schriftform, in elektronischer Form with QES, or by conclusive conduct. Higher-value B2B transactions are typically concluded in Textform or Schriftform for evidentiary weight. The exceptions are decisive and statutory.

§ 311b Abs. 1 BGB mandates notarielle Beurkundung for any contract by which one party undertakes to transfer or acquire ownership in a Grundstück (land, including buildings as essential components). A real-estate Kaufvertrag concluded only privately is void per § 125 BGB; the defect is healed only by Auflassung and Eintragung in the Grundbuch (§ 311b Abs. 1 S. 2 BGB). The notarielle Beurkundung requirement also extends to contracts assigning real-estate purchase claims and to most ancillary agreements that affect the obligation to transfer the Grundstück. § 15 Abs. 3 GmbHG imposes parallel notarielle Beurkundung on the assignment of GmbH-shares: any Abtretungsvertrag over a Geschäftsanteil must be notarised, and the obligational Verpflichtungsgeschäft (typically the Anteilskaufvertrag) must equally be notarised under § 15 Abs. 4 GmbHG. Vehicle transfers do not require notarisation but customarily involve transfer of the Zulassungsbescheinigung Teil II (formerly Fahrzeugbrief) with signature. Certain intellectual-property transfers carry their own formality requirements under the Urheberrechtsgesetz and the Patentgesetz, notably the Schriftform required for full assignments of registered rights in some constellations. Cross-link to /handbook/de/form-requirements.html.

Required Clauses

A Kaufvertrag capable of supporting a Kaufpreisanspruch under § 433 BGB and an Eigentumsverschaffungsanspruch needs four recurring clauses.

Vertragsparteien. Full legal names, Sitz, and where applicable the Handelsregisternummer and registry court of each party. § 305 BGB requires identifiability; vague references defeat later enforcement. In B2C the Verkäufer’s status as Unternehmer drives entry into the Verbrauchsgüterkauf-regime, so the Unternehmer-classification should be stated unambiguously.

Kaufgegenstand. The central clause and the one that does the most work in the Mängelhaftung analysis. The Sache must be defined precisely enough that any later deviation can be measured against it: type, quantity, technical specifications, condition (new, used, refurbished), applicable standards (DIN, ISO, CE marking, RoHS as relevant), referenced design documents, expected use, software-version where embedded. Without an enforceable Kaufgegenstand-Beschreibung, the Sachmangelbegriff under § 434 BGB collapses into the residual gewöhnliche Verwendung test that is hard to litigate either way. The clause must also cover Zubehör, accessories, documentation, source code (for software) and any required Lizenzen.

Kaufpreis. The price and its modalities: net amount, VAT treatment, currency, deposit, payment milestones, due date, accepted payment methods, default-interest rate. § 433 Abs. 2 BGB requires the buyer to pay the agreed price, but does not itself fix a price — a Kaufvertrag without an agreed Kaufpreis is incomplete and either fails as too indefinite or — where commercially identifiable — drops into a Geschäftsführung ohne Auftrag or Bereicherungs-analysis that no party intended.

Lieferbedingungen. Place and date of delivery, mode of shipment, packaging, accepted Incoterms-reference where applicable. The clause interlocks with the Gefahrübergang rules at §§ 446–447 BGB and with the Untersuchungs- und Rügefrist of § 377 HGB in B2B.

Optional and Recommended Clauses

Beyond the required four, several clauses are not statutorily mandatory but are commercially essential.

Gefahrübergang. § 446 BGB is the default: the Preisgefahr and the Leistungsgefahr pass to the Käufer on Übergabe. § 447 BGB modifies the rule for the Versendungskauf between merchants — risk passes to the Käufer on handover to the carrier at the agreed dispatch point. For consumer sales the Versendungskauf-rule does not apply: under § 475 Abs. 2 BGB the risk passes only on actual handover to the consumer or to a person designated by him, regardless of carrier involvement. Parties may agree a different Gefahrübergang date in B2B individual contracts; AGB modifications to consumer detriment are barred. Incoterms-references (EXW, FCA, CIP, DAP, DDP, etc.) are commonly used to fix the Gefahrübergang and the cost-allocation between Verkäufer and Käufer with international precision.

Mängelhaftungsfrist. The contractual Verjährungsfrist for Mängelansprüche, calibrated to the statutory floor at § 438 BGB. The standard period is two years from Übergabe (or, for legal defects on real estate, from registration); thirty years for legal defects giving rise to a third-party right to demand surrender of the Sache and for real-property rights; five years for goods used for a building in their customary manner and causing its defectiveness; thirty years for ownership claims under § 985 BGB. In B2B contracts the two-year period may be shortened to one year by individual agreement for used goods; in Verbrauchsgüterkauf the warranty period must be at least two years for new goods, and may be shortened by individual agreement (not AGB) to one year for used goods under § 476 Abs. 2 BGB.

Eigentumsvorbehalt. Separate detailed section below.

Incoterms. A standardised reference to Incoterms 2020 (or a specific earlier edition) fixes Gefahrübergang, transport-cost allocation, customs-clearance responsibility and insurance obligations in one short clause. The reference must include the Incoterm abbreviation, the named place, and the edition year.

Untersuchungs- und Rügeverfahren. In B2B Handelskauf under § 377 HGB, the buyer must inspect the goods unverzüglich after delivery and must notify any Mangel without delay. The clause should specify the inspection method, the inspection window, the notification channel and the documentary form of the Mängelrüge. Failure to inspect or notify in time leads to Genehmigungsfiktion: the goods are deemed approved and Mängelansprüche are lost (except where the Verkäufer arglistig verschwiegen has the defect).

CISG-Ausschluss. Where both parties have their places of business in CISG-signatory states, the CISG applies by default unless validly excluded. The classic opt-out is a Rechtswahlklausel combined with an express exclusion: “Auf diesen Vertrag findet ausschließlich deutsches Recht unter Ausschluss des UN-Kaufrechts (CISG) Anwendung.” Choice of deutsches Recht alone is generally treated as ambiguous: German law includes the CISG, so the explicit Ausschluss is essential.

Prohibited Clauses (in AGB Context)

Where the Kaufvertrag is concluded as AGB — pre-formulated, intended for multiple use and unilaterally imposed — several patterns are routinely struck down.

Vollständiger Haftungsausschluss für neue Verbraucherware. § 476 BGB in combination with § 309 Nr. 8 lit. b BGB flatly voids any AGB clause in Verbrauchsgüterkauf that excludes or limits Mängelansprüche on new goods. The buyer-consumer cannot waive the statutory regime in AGB. The rule is ohne Wertungsmöglichkeit — no fact-pattern justification is available.

Verkürzung der Mängelhaftungsfrist für neue Verbraucherware unter zwei Jahre. § 476 Abs. 2 BGB permits a contractual shortening of the warranty period to one year only for used goods and only by Individualvereinbarung — not by AGB. Any AGB shortening for new consumer goods below two years is void; any AGB shortening for used consumer goods below one year is void; any AGB shortening at all without express Individualvereinbarung on used goods is suspect.

Abwälzung der Untersuchungskosten auf den Verbraucher. AGB that impose the cost of Nacherfüllung — repair or replacement — on the consumer in Verbrauchsgüterkauf fail under § 475 Abs. 4 BGB read with § 307 BGB; the Verkäufer must bear the Aufwendungen for Nacherfüllung.

“Verkauf an Gebraucht-Händler”-Umgehung. A pattern occasionally used in dealership networks: a Verkäufer of used vehicles labels every sale as B2B by routing through an intermediary, hoping to escape Verbrauchsgüterkauf-restrictions. Where the economic substance is a sale to a consumer, courts apply the Verbrauchsgüterkauf-regime to the underlying chain and disregard the routing. Cross-link to /handbook/de/agb-rules.html for the complete Klauselverbote catalogue.

Termination and Notice — Mängelrechte under § 437 BGB

The Mängelrechte sequence at § 437 BGB is the defining termination apparatus of the Kaufvertrag and operates differently from the Werkvertrag-regime at §§ 633 ff. BGB. Three steps with strict prerequisites.

Nacherfüllung. The buyer’s first remedy under § 437 Nr. 1 and § 439 BGB: Nachbesserung (repair of the defective Sache) or Ersatzlieferung (delivery of a defect-free replacement). The buyer chooses between the two unless the chosen variant is unverhältnismäßig. The Verkäufer bears all Aufwendungen — transport, labour, material — and has a Nachbesserungsfrist set by the buyer.

Rücktritt or Minderung. Where Nacherfüllung fails, is refused or is unzumutbar, the buyer may declare Rücktritt under § 437 Nr. 2 read with §§ 440, 323, 326 Abs. 5 BGB — the contract unwinds and the parties restore mutual performances — or Minderung under § 441 BGB — the Kaufpreis is reduced in proportion to the diminished value. Rücktritt requires a Fristsetzung with a Nachfrist of reasonable length, except where § 323 Abs. 2 BGB excuses Fristsetzung (serious or final refusal, time-of-the-essence terms, special circumstances). Rücktritt is unavailable where the Mangel is unerheblich (§ 323 Abs. 5 S. 2 BGB).

Schadensersatz. Where the Verkäufer is at fault under § 280 BGB, the buyer may seek Schadensersatz neben der Leistung (for collateral damage that survives Nacherfüllung) or Schadensersatz statt der Leistung (where Nacherfüllung has failed or been refused). The Verkäufer may exonerate himself by proving absence of Verschulden; in B2C the Beweislastumkehr at § 476 BGB applies to defects manifest in the first twelve months.

The parallel Werkvertrag-regime is sketched at /handbook/de/contracts/werkvertrag.html; the central differences are the absence of an Abnahme-mechanism in Kaufvertrag and the explicit hierarchy of remedies.

Eigentumsvorbehalt (Retention of Title)

§ 449 BGB recognises retention of title as a standard security device in B2B sales. Three contractual variants populate the case law.

Einfacher Eigentumsvorbehalt. Title transfers from Verkäufer to Käufer on full payment of the Kaufpreis. Until then, the Verkäufer remains Eigentümer and the Käufer is a berechtigter Besitzer. In insolvency of the Käufer, the Verkäufer has a Aussonderungsrecht under § 47 InsO if payment has not occurred, and the goods can be reclaimed.

Verlängerter Eigentumsvorbehalt. The Käufer is authorised by the Verkäufer to resell the goods in the ordinary course of business; in exchange, the Käufer assigns to the Verkäufer in advance his future Kaufpreisforderung against his sub-buyers. The Verkäufer converts a Sachenrechtsposition into a Forderungs-position over the sale-proceeds chain. The clause must specify the scope of the resale authorisation, the assignment chain and the Einziehungsermächtigung — typically the Käufer retains a revocable authority to collect the proceeds until the Verkäufer withdraws it on payment-default.

Erweiterter Eigentumsvorbehalt. The retention of title persists not only until payment for the specific goods but until satisfaction of all current and future claims of the Verkäufer against the Käufer. In B2B this is broadly admissible, including for Kontokorrent-claims; but a Konzernvorbehalt — extending the reservation to claims of affiliated companies of the Verkäufer — may be void per § 138 BGB as sittenwidrig, because it ties up the Käufer’s asset position in favour of legally separate group entities without adequate counter-value. The BGH has applied this analysis to strike down particularly aggressive Konzernvorbehalt-clauses.

The drafting discipline is: choose the variant intentionally, document the assignment and the Einziehungsermächtigung expressly for verlängerter Vorbehalt, and avoid Konzernvorbehalt unless the corporate structure justifies and the wording stays within § 138 BGB limits.

Court Precedent

BGH on Konzernvorbehalt and verlängerter Eigentumsvorbehalt limits. A long line of BGH decisions establishes that extensions of Eigentumsvorbehalt beyond the direct contractual relationship attract close scrutiny. Konzernvorbehalt-clauses that secure claims of group affiliates without commensurate counter-value have been held sittenwidrig and void per § 138 BGB. Verlängerter Eigentumsvorbehalt with Vorausabtretung of sub-sale proceeds is admissible but must respect the Bestimmtheitsgrundsatz and the boundaries of competing security interests of third-party financiers.

BGH on consumer-sale AGB warranty exclusions. The BGH has repeatedly applied § 309 Nr. 8 BGB to strike down AGB clauses in Verbrauchsgüterkauf that exclude or limit Mängelansprüche on new goods. The pattern is automatic: any AGB clause reducing the consumer’s statutory rights below the floor of §§ 437, 438, 476 BGB falls without Wertungsmöglichkeit.

BGH VIII ZR 13/14 (2016) on Beweislastumkehr scope per § 476 BGB. The decision clarified the operation of the Beweislastumkehr (now § 477 BGB after reform, formerly § 476 BGB pre-2022). A defect manifest within the statutory presumption period is presumed to have been present at Gefahrübergang unless the presumption is incompatible with the nature of the Sache or the Mangel. The BGH emphasised the broad reach of the presumption and lowered the consumer’s evidentiary hurdle materially. Subsequent legislative reform extended the presumption period to twelve months (from six) and codified the BGH’s approach.

Common Pitfalls

Six recurring failure modes deserve flagging.

First, missing CISG-Ausschluss in cross-border B2B: where parties’ places of business are in different CISG-signatory states, the CISG applies kraft Staatsvertrag unless validly excluded. Choice of deutsches Recht alone is ambiguous because German law includes the CISG. Without an express Ausschluss, the contract is governed by the CISG with surprising consequences for warranty (Article 39 inspection-and-notification differs from § 377 HGB), risk-shift (Article 67 CISG differs from § 447 BGB), and remedies (Article 49 CISG differs from § 437 BGB).

Second, incorrect retention-of-title scope: an erweiterter Eigentumsvorbehalt drafted as a Konzernvorbehalt without adequate counter-value risks invalidity under § 138 BGB; a verlängerter Eigentumsvorbehalt without a clear Vorausabtretung and Einziehungsermächtigung fails the Bestimmtheitsgrundsatz.

Third, ignoring § 377 HGB Rügefrist in B2B: the Käufer-merchant who fails to inspect unverzüglich and to notify defects without delay loses Mängelansprüche by Genehmigungsfiktion. The clause discipline is to specify the inspection method, the deadline and the notification channel expressly so that compliance can be evidenced and the trap avoided.

Fourth, B2C “secondhand” mischaracterisation: a sale of nominally used goods to a consumer where the substance is new (e.g., overstock, end-of-line, demonstration units in unused condition) cannot be re-labelled as used to gain the § 476 Abs. 2 BGB warranty-shortening privilege; courts apply the substantive test.

Fifth, AGB warranty exclusions on new consumer goods: any AGB clause excluding, limiting or shortening Mängelansprüche on new goods sold to consumers falls automatically under § 476 in combination with § 309 Nr. 8 BGB. The pattern is recurrent in supplier templates carried over from B2B drafting; the templates must be split by buyer-class.

Sixth, unclear Gefahrübergang on Versendungskauf: B2B parties may default to § 447 BGB (risk at carrier handover) but consumers cannot — § 475 Abs. 2 BGB places risk on actual handover to the consumer. Mis-drafting the clause as a flat “Gefahr geht mit Versand über” is void in B2C and may produce a costly mismatch when the carrier loses the shipment.

The integrating discipline is matching the sub-regime to the substance of the deal (B2C, Handelskauf, CISG), drafting an enforceable Kaufgegenstand-Beschreibung, allocating Gefahrübergang and Eigentumsvorbehalt consciously, and respecting the statutory floors of §§ 437, 438, 476 BGB in any AGB context.

Disclaimer: This content is informational, not legal advice. Last verified: 2026-05-10. Always consult licensed counsel for binding decisions.