What Are Four Types Of Mistakes That Can Invalidate A Contract?

Discover the four critical mistakes that can invalidate a contract. Learn how to avoid mutual, unilateral, factual, and legal errors, using real Utah laws. Stay informed and protected!

Ruf gill
7 min readSep 5, 2024

What Are Four Types Of Mistakes That Can Invalidate A Contract?

Contracts are the bedrock of business transactions and personal agreements. They establish the obligations and rights of the parties involved and ensure that both parties are governed by mutually agreed-upon terms. However, not all contracts are foolproof. Some errors can render a contract invalid or unenforceable. Understanding these types of mistakes can save you from future legal hassles and financial losses. This article will dive into four types of mistakes that can invalidate a contract, focusing on real laws from Utah. By the end, you’ll have a comprehensive understanding of how to avoid these pitfalls and protect your interests.

Mutual Mistake: When Both Parties Are in the Dark

What Is a Mutual Mistake?

A mutual mistake occurs when both parties involved in a contract are mistaken about a critical fact that forms the basis of the agreement. This can significantly alter the contract’s terms, leading both sides to have a false understanding of what they agreed to. According to Utah Code Ann. § 25–5–4, a mutual mistake can render a contract voidable if it pertains to a material fact, meaning it must significantly impact the agreement’s core.

Real-World Example

Imagine you’re purchasing a property in Salt Lake City, and both you and the seller believe the land includes a mineral rights lease. After the transaction, you discover that the lease was terminated years ago. Since both parties were mistaken about an essential term of the contract, you could seek to declare the contract voidable.

Jeremy Eveland Utah Attorney

Legal Implications

In the state of Utah, mutual mistakes can be grounds for rescinding a contract. This means that the contract can be undone, putting both parties back in their original positions before the agreement. It’s essential to consult a legal expert to navigate the complexities and ensure your rights are preserved.

How to Avoid It

  • Double-check all facts: Verify every detail mentioned in the agreement.
  • Consult professionals: Whether it’s hiring a surveyor for property boundaries or an appraiser, ensure all vital details are accurate.

Unilateral Mistake: When Only One Party Is Wrong

What Is a Unilateral Mistake?

A unilateral mistake happens when only one party is mistaken about an essential term or fact of the contract. Under Utah Code Ann. § 70A-2–302, if the non-mistaken party knew or had reason to know of the mistake, the mistaken party may be able to avoid the contract.

Real-World Example

Consider if you’re buying a car from a dealership in Provo, and you mistakenly believe that the car includes a specific high-end sound system. You sign the contract based on this belief, but later discover the car has a standard sound system. If the dealership knew or should have known about your mistake, you might have grounds to void the contract.

Legal Implications

It’s generally harder to prove a unilateral mistake, but it’s not impossible. Courts in Utah will often require that the mistake be material and that enforcement of the contract would be unconscionable, or that the non-mistaken party knew of the mistake.

How to Avoid It

  • Read your contract carefully: Ensure you understand all terms and conditions.
  • Ask for clarifications: Never assume; always confirm your assumptions with the other party.
What Are Four Types Of Mistakes That Can Invalidate A Contract?

Mistake of Fact: Understanding the Basics

What Is a Mistake of Fact?

A mistake of fact occurs when a party misunderstands a basic component of the contract. This misunderstanding must pertain to a past or present fact (not a future one) and must be material to the agreement. According to Utah Code Ann. § 70A-2–302, contracts based on a mutual or unilateral mistake of fact can be voided.

Real-World Example

Suppose you are entering a contract to buy a rare book from a bookstore in Park City. Both parties believe the book is a first edition, but it later turns out to be a reprint. This mistake involves a fundamental aspect of the contract and could make it voidable.

Legal Implications

A mistake of fact affects the very foundation of the contract. Utah courts will typically allow the mistaken party to void the contract if the mistake meets the criteria set by state laws.

How to Avoid It

  • Conduct thorough research: Whether it’s a product, property, or service, ensure you know all the relevant facts.
  • Include warranties: Have the other party warrant that critical facts are true.

Mistake of Law: Navigating Legal Complexities

What Is a Mistake of Law?

A mistake of law occurs when a party misconstrues the legal consequences of a fact or a contract term. While “ignorance of the law is no excuse,” there are nuances in contract law that can make a contract voidable if a mistake of law is evident. Utah law is less forgiving when it comes to mistakes of law, compared to mistakes of fact, but exceptions do exist.

Real-World Example

Imagine you sign a contract believing that Utah law does not require a permit for a specific business activity in Ogden. However, you later discover that permits are indeed required and that operating without one would result in penalties. If the other party knew you were mistaken, you might have grounds to void the contract.

Legal Implications

Mistakes of law are generally harder to prove as grounds for invalidating a contract. However, if it can be shown that one party took advantage of the other’s misunderstanding of the law, courts in Utah may consider rescinding the agreement.

How to Avoid It

  • Seek legal advice: Consult an attorney to understand the legal implications thoroughly.
  • Educate yourself: Familiarize yourself with Utah laws related to your transaction.
What Are Four Types Of Mistakes That Can Invalidate A Contract?

Common Misconceptions About Contract Mistakes

Misconception 1: All Mistakes Void a Contract Automatically

Not all mistakes lead to an automatic void of a contract. The mistake must be material and meet specific legal criteria. Oftentimes, courts will weigh the nature of the mistake and the fairness of enforcing the contract.

Misconception 2: Only Written Contracts Can Be Voided for Mistakes

Both written and oral contracts can be subject to voiding due to mistakes, although written contracts provide more substantial evidence of the terms agreed upon.

Misconception 3: You Can’t Enforce Any Part of a Voidable Contract

Even if a contract is voidable due to a mistake, certain provisions may still be enforceable, depending on the situation and applicable Utah law.

Misconception 4: Voidable Contracts Are Always Unenforceable

A voidable contract is not necessarily unenforceable. It means that the aggrieved party has the right to void it; if they choose not to, the contract remains enforceable.

Protecting Your Interests: Practical Tips

Document Everything

Keep records of all communications and agreements to have evidence in case of a dispute. Having a well-documented trail can be crucial in establishing the basis of a mutual or unilateral mistake.

Use Clear and Unambiguous Language

Ensure that your contract is written in clear, understandable terms. Avoid legal jargon that could be misinterpreted.

Include Contingency Clauses

Adding clauses that account for potential mistakes can make it easier to resolve any issues that arise. Contingency clauses can specify what will happen if a mistake is discovered.

Regular Legal Consultations

Consulting with a lawyer before signing any significant contract can protect against potential mistakes.

Frequently Asked Questions

1. What should I do if I realize there’s been a mistake after signing a contract?

You should immediately consult a legal professional to discuss the mistake and determine your options. Acting promptly can increase your chances of resolving the issue favorably.

2. Can a mutual mistake be waived if both parties decide to continue with the contract?

Yes, if both parties acknowledge the mistake and agree to adjust the contract terms accordingly, the contract can be amended rather than voided.

3. How does a court determine whether a mistake is significant enough to void a contract?

The court will consider whether the mistake affects the contract’s fundamental basis and whether enforcing the contract would be unjust due to the mistake.

4. Can an “as-is” clause protect a seller from unilateral mistakes made by the buyer?

While “as-is” clauses can offer protection, they are not foolproof. Courts may still void the contract if it’s evident that the seller knew or should have known about the buyer’s mistake and did not take steps to correct it.

Conclusion

Understanding the types of mistakes that can invalidate a contract is crucial for anyone entering into agreements, be they personal or professional. By knowing what constitutes mutual mistakes, unilateral mistakes, mistakes of fact, and mistakes of law, you can better protect yourself and your interests. Always verify all details, consult professionals, and stay informed to mitigate risks.

To speak with a lawyer, call attorney Jeremy Eveland at (801) 613–1472.

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The information contained in this article is for information purposes only and is not legal advice. For legal advice, hire a competent lawyer in your jurisdiction.

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