Understanding Mistakes in Contracts: When Can They Invalidate an Agreement?​

Contracts are the foundation of many business dealings. But what happens if a misunderstanding occurs? This post explores common types of mistakes in contracts and their potential consequences.​


  • Common Mistake: Both parties share an erroneous belief about a fundamental aspect of the contract, rendering it void. Imagine agreeing to buy a rare painting, both believing it to be authentic when it’s a copy.​
  • Mutual Mistake: Similar to a common mistake, both parties are mistaken about a crucial element. This could involve the subject matter, like accidentally contracting to sell a car that has already been sold.​
  • Unilateral Mistake: Only one party is mistaken about a material term. Perhaps a buyer mistakenly believes an item is included in a purchase that the seller never intended.​

  • Factual Errors: These relate to essential aspects of the agreement, like the property’s condition when buying a house.​
  • Written Contract Mistakes: Typos or omissions in the written contract can impact enforceability.​
  • Mistaken Identity: Entering a contract believing the other party is someone else.​

Not all mistakes invalidate a contract. The key is whether the mistake is fundamental and affects the agreement’s core.​

If a mistake renders a contract void, it’s treated as if it never existed. Both parties are released from their obligations.​

For complex contracts, consulting a lawyer is recommended. They can assess the situation and advise on the potential consequences of a mistake.​

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