Who Has The Burden Of Proof For Mistake in Contracts?

In contract law, the burden of proof for a mistake typically falls on the party seeking to assert the mistake as a basis for voiding or reforming the contract. This means that they must provide evidence of the mistake and how it materially affects the contract.

The burden of proof for a mistake in contract law rests primarily on the party asserting the claim of mistake. This party must demonstrate the existence of a mutual mistake or a unilateral mistake that meets the legal threshold for relief, typically showing that the mistake caused a material impact on the terms or performance of the contract. In general, the assertion of a mistake will require the claimant to prove not only that the mistake occurred, but also that it was significant enough to warrant relief.

In cases of mutual mistake, where both parties are mistaken about a fundamental fact of the contract, either party may be able to seek relief. However, the party requesting reformation or rescission must provide clear and convincing evidence of the mutual misconception and how it influenced their decision-making. Conversely, in unilateral mistake cases, generally only the party that made the mistake may seek relief, and they must prove the mistake was reasonable under the circumstances and that the other party had reason to know of the mistake.

Case law illustrates these principles, with important distinctions between mutual and unilateral mistakes. For instance, in the case of *Sherwood v. Walker* (1887), the court emphasized the need for shared misunderstanding about a significant fact to grant relief. This demonstrates how the burden lies on the party claiming the mistake to show that their interpretation was valid against the backdrop of the contract's formation and intent.

Furthermore, courts will also consider the conduct and communications of the parties surrounding the contract negotiation and execution when evaluating claims of mistake. If one party's mistake is obvious or should have been known to the other, courts may apply equitable principles to deny the mistaken party relief, thereby intensifying the need for clarity in the proof presented by the party asserting the mistake.

Lastly, the documentary evidence, witness testimony, and the timing of the assertion of the mistake are vital components of meeting the burden of proof. Without adequate substantiation of the claim, a party may find their assertion of mistake ineffective.

• 1Sherwood v. Walker (1887) - significant for establishing the conditions under which mutual mistake can void a contract.
• 2Raffles v. Wichelhaus (1864) - important for addressing mutual mistake regarding the subject matter of the contract.
• 3Scherer v. McCarthy (1994) - illustrates how the burden of proof is applied in unilateral mistake cases.
• 4Lenawee County Board of Health v. Messerly (1980) - highlights court considerations in unilateral mistakes and the required proof.
• 5Crawford v. E.C. McBurney (1896) - demonstrates the importance of demonstrating awareness or knowledge of the mistake by the other party.

• what-is-mutual-mistake-in-contract-law
• distinction-between-unilateral-and-mutual-mistake
• contract-formation-and-mistake-standards