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Art. 24 Bundesgesetz vom 30. März 1911 betreffend die Ergänzung des Schweizerischen Zivilgesetzbuches (OR)
OR; Erste Abteilung: Allgemeine Bestimmungen; Erster Titel: Die Entstehung der Obligationen; Erster Abschnitt: Die Entstehung durch Vertrag; F. Mängel des Vertragsabschlusses; I. Irrtum; 2. Fälle des Irrtums
Art. 24 OR
Der Irrtum ist namentlich in folgenden Fällen ein wesentlicher: 1. wenn der Irrende einen andern Vertrag eingehen wollte als denjenigen, für den er seine Zustimmung erklärt hat; 2. wenn der Wille des Irrenden auf eine andere Sache oder, wo der Vertrag mit Rücksicht auf eine bestimmte Person abgeschlossen wurde, auf eine andere Person gerichtet war, als er erklärt hat; 3. wenn der Irrende eine Leistung von erheblich grösserem Umfange versprochen hat oder eine Gegenleistung von erheblich geringerem Umfange sich hat versprechen lassen, als es sein Wille war; 4. wenn der Irrtum einen bestimmten Sachverhalt betraf, der vom Irrenden nach Treu und Glauben im Geschäftsverkehr als eine notwendige Grundlage des Vertrages betrachtet wurde.
Bezieht sich dagegen der Irrtum nur auf den Beweggrund zum Vertragsabschlusse, so ist er nicht wesentlich.
Blosse Rechnungsfehler hindern die Verbindlichkeit des Vertrages nicht, sind aber zu berichtigen.
Gerichtsentscheide zu dieser Bestimmung (245)
60/2015/43 · sh (Art. 23 i.V.m. Art. 24 Abs. 1 Ziff. 4 OR)
Wildlife Damage Assessment Settlement Validity Challenge
Cited in the context of assessing whether the representative's agreement constituted a fundamental error, which was necessary to evaluate the validity of the settlement agreement.
BGE 119 II 341 (Art. 24 cpv. 3 CO)
Real estate sale: price adjustment for surplus area revealed by newer cadastral survey; applicability of calculation-error rule (Art. 24(3) CO) and vendor's area guarantee (Art. 219 CO).
The court applied this provision in holding that no calculation error existed, as the surface difference arose from a more precise measurement method rather than a shared arithmetic mistake.
ZVE.2025.23 · ag (Art. 24 Abs. 1 Ziff. 4 OR)
Child Support Agreement Affirmed Despite Retroactive Payment Dispute
Cited for the definition of a fundamental mistake, where a factual circumstance was considered a necessary basis for the contract.
ZVE.2024.45 · ag (Art. 24 Abs. 1 Ziff. 4 OR)
Tenant's Appeal on Commercial Property Costs Dismissed Due to Prior Settlement Agreement
Defines a fundamental mistake (Grundlagenirrtum) as a mistake concerning a factual circumstance that was considered a necessary basis for the contract.
715.2024.190 · bl (Art. 24 Abs. 2 OR)
Applicant Bound by Appeal Waiver Despite Claim of Misadvice
Cited by the court to determine that the plaintiff's error was a motive error and therefore not relevant, meaning the waiver of appeal was binding.
BRGE.III.Nr.0076.20 · zh (Art. 24 OR)
Municipality's Right of First Refusal on Composite Property Transfer Upheld
Invoked by the appellant concerning a mistake of essential facts regarding the cancellation agreement, which the court rejected.
15.2024.89 · ti (Art. 24 cpv. 1 n. 4 CO)
Enforcement Auction Validity Affirmed Despite Minor Mileage Discrepancy
Used extensively to determine if the essential error existed to justify the annulment of the adjudication on RI 1's appeal.
ZSU.2024.173 · ag (Art. 24 Abs. 1 Ziff. 4 OR)
Provisional Enforcement of Debt Upheld Despite Allegations of Misrepresentation
This provision concerns fundamental errors in contract law, specifically a mistake about a necessary basis for the contract, which the debtor invoked as a defense.
HG210167 · zh (Art. 24 Abs. 1 Ziff. 1 OR)
Plaintiff v. Bank Regarding Unauthorized Account Debits
Cited as the legal basis for finding a material error in the declaration of intent.
PC240009 · zh (Art. 24 Abs. 1 Ziff. 4 OR)
Revision of Divorce Judgment Due to Fundamental Error in Pension Payment
Cited as the legal basis for finding that the appellant made a fundamental error regarding a fact considered essential for the contract.
LF240069 · zh (Art. 24 Abs. 1 Ziff. 4 OR)
Estate Appeal Dismissed Due to Clerical Errors and Irrevocable Renunciation
Cited as defining when an error is considered essential, potentially making a disclaimer invalid.
AC/163/2018 · ge (art. 24 al. 1 ch. 4 CO)
Legal Aid Denial Overturned in Settlement Validity Challenge
Cited in the reasoning section regarding essential error as a ground for contract invalidation.
TVR.2024.Nr.10 · tg (Art. 24 OR)
Municipality's Attempt to Void Road Repair Settlement Based on Alleged Fundamental Error Fails
Cited in the heading and reasoning regarding the substantive law applied to reject the plea of fundamental error (Grundlagenirrtum).
ZKBES.2024.9 · so (Art. 24 Abs. 1 Ziff. 4 OR)
Heirs' Renunciation of Inheritance Set Aside Due to Factual Mistake Regarding Nursing Home Debt.
The court discussed the requirements for essential error, which formed the basis for annulling the prior renunciation.
HG230134 · zh (Art. 24 Abs. 1 Ziff. 4 OR)
Claimant v. Defendant: Repayment of Advance Due to Mistake of Fact Regarding Importability
This article was the legal basis for declaring the contract voidable due to a fundamental error, leading to the claim for repayment.