What Makes a Contract Invalid? Key Factors & Legal Pitfalls
Understanding what makes a contract invalid can help you avoid costly legal disputes. Learn about void, voidable, and unenforceable contracts and how to protect your agreements. 6 min read updated on February 10, 2025
Key Takeaways
- A contract must include an offer, acceptance, lawful consideration, and mutual agreement to be valid.
- A void contract is never legally enforceable, while a voidable contract can be challenged but remains valid unless annulled.
- Several factors can invalidate a contract, including fraud, undue influence, coercion, misrepresentation, and lack of capacity.
- Contracts may also become unenforceable if their terms are illegal, ambiguous, or impossible to fulfill.
- Additional conditions such as mistake, duress, and unconscionability can render a contract void or voidable.
- Proper contract execution, including clarity in terms and documentation, is crucial to preventing disputes.
- A contract checklist helps ensure that all legal requirements are met before signing.
- Understanding exceptions that void contracts can help avoid legal disputes and enforceability issues.
- Seeking legal counsel can clarify contract terms and avoid costly litigation.
Knowing what makes a contract invalid will help you avoid common mistakes when drafting an agreement. When presented with one in the future, you will be able to tell right away whether the contract is legal or not, thus sparing yourself from unintentional involvement in any illegal activity.
Essential Components to Include In a Contract
To make a contract valid and enforceable under the law, adhere to the following guidelines:
- Include in the contract the two main elements―an offer and an acceptance.
- Make sure the contract's subject matter is legal.
- Make sure that both parties enter the contract willingly, are over the age of consent, and have the mental capacity to satisfy the terms of the agreement.
- Include a clearly defined consideration, which could take the form of money, interest, a right, or benefit.
- Make sure to execute the contract in the appropriate form, either written or verbal. Note that contracts dealing with significant considerations, real estate, or debts, as well as contracts that cannot be fulfilled for a while, must be in written form.
Common Factors That Invalidate a Contract
Certain circumstances can render a contract invalid, making it unenforceable by law. Here are the most common factors that can invalidate a contract:
- Lack of Capacity – If one party is a minor, mentally incapacitated, or under the influence at the time of signing, the contract may be invalid.
- Illegality – Contracts involving illegal activities, such as fraud, bribery, or an agreement that violates public policy, are void.
- Misrepresentation or Fraud – If one party deliberately provides false information or conceals crucial facts, the contract may be deemed invalid.
- Duress or Coercion – When a party is forced into an agreement under threats or undue pressure, the contract lacks genuine consent.
- Unconscionability – A contract may be invalid if it contains grossly unfair terms that heavily favor one party over the other.
- Mistakes – A significant mutual mistake regarding contract terms, subject matter, or obligations can void an agreement.
- Failure to Meet Formal Requirements – Certain contracts, such as those for real estate transactions or long-term agreements, must be in writing to be enforceable.
Difference Between “Void” and “Voidable” Contracts
A void contract is not valid and, thus, is not enforceable under the law. None of the parties are bound by its terms. The following circumstances can void a contract:
- The contract's terms are illegal or violate public policy.
- At the time of signing the contract, a party was not of sound mind.
- A party was not of the age of consent.
- It is impossible to satisfy the terms of the contract.
- The contract violates a party's rights.
A voidable contract, on the other hand, is a valid agreement that sometimes could be enforced if both parties agree to proceed with it. The following scenarios can deem a contract voidable:
- A party was forced or threatened to enter the agreement.
- Undue influence was exercised over a party.
- A party had no mental competence to sign the agreement.
- The contract was breached.
- Both parties made mistakes.
- The contract was fraudulent.
- The information and facts were misrepresented.
How Ambiguity Affects Contract Validity
A contract must have clear and specific terms for enforcement. Ambiguous or vague language can lead to disputes and may result in a contract being declared void or unenforceable. Courts may refuse to enforce a contract if:
- Key terms are missing or undefined.
- The contract contains contradictory clauses.
- The obligations of one or both parties are unclear.
To avoid ambiguity, contracts should be carefully drafted with precise language, including well-defined terms, obligations, and dispute resolution mechanisms.
Advice for Executing a Contract Correctly
- Read through the entire document.
- Make sure the terms of the contract are clear and specific.
- Make sure to understand exactly what you are agreeing to and clarify anything that seems vague.
- Put it in written form to protect yourself in case of any disputes in the future.
- Be aware of the acceptance details.
- Confirm the identity of the other party.
The Role of Consideration in Contract Validity
Consideration—the value exchanged between parties—is a fundamental contract requirement. A contract may be invalid if:
- There is no exchange of value (e.g., a one-sided promise with no obligation in return).
- The consideration is illegal or violates public policy.
- It is based on a past event rather than a present or future agreement.
Each party must receive some benefit or incur a legal detriment for the contract to be valid.
Mistakes That Make a Contract Void
- Unilateral mistake.
- Mutual mistake.
- Mistake as to identity.
- Lack of capacity.
- Allocation of risk.
- Defective contracts.
- Failure to understand.
- Mistake relating to documents.
- Noncontractual subject matter.
- Failure to reach an agreement.
- Failure to negotiate.
The Impact of Contractual Mistakes
Mistakes in contract drafting or execution can affect validity. Common mistakes that may render a contract void include:
- Mutual Mistake – If both parties are mistaken about a fundamental contract term, the agreement may be unenforceable.
- Unilateral Mistake – If only one party is mistaken, the contract might still be valid unless the error was significant and the other party took advantage of it.
- Errors in Written Contracts – Typos, miscalculations, or misinterpretations of legal terms can lead to contract disputes.
- Misunderstanding of Intent – If both parties have different understandings of the contract's purpose, it may be deemed invalid.
Avoiding these mistakes requires clear communication, precise drafting, and legal review before execution.
Mistakes Made When Negotiating Contracts
- Bypassing the planning stage.
- Being a passive participant.
- Relying on a generic template.
- Combining multiple contracts.
- Misunderstanding of services and products.
- Relying on unclear breach of contract terms.
- Omitting conflict resolution procedures.
- Excluding detailed payment terms.
- Accepting the partner's explanation.
- Starting before the execution.
A Checklist for Creating a Successful Contract
- Offer and acceptance.
- Intention to create legal relation.
- Lawful consideration.
- Capacity of parties.
- Free consent.
- Lawful object.
- Writing and registration.
- Certainty.
- Possibility of performance.
- Not expressly declared void.
Exceptions That Can Void a Contract
- A future modification of the contract.
- The existence of a similar agreement, not contradicting or changing the main contract.
- A condition that had to happen before contract's fulfillment was due.
- The contract formation defects.
- The parties' intentions about unclear terms in the contract.
- The consideration's problems.
- A previous valid agreement that is incorrectly reflected in the contract.
Unenforceable Contracts
The following reasons could make a valid contract impossible to enforce:
- Lack of capacity.
- Duress, or coercion, into a contract.
- Undue influence.
- Misrepresentation during the negotiation process.
- Nondisclosure of important facts.
- Unconscionability (when something about the agreement is shockingly unfair).
- Public policy violation (for example, when an employee is forced to sign a contract that prevents them from joining a union or going on a medical leave, or when a landlord makes a resident sign a contract to forbid companion animals for medical purposes).
- A mistake made by either or both parties.
- Impossibility of fulfillment of the contract's terms.
Situations Where Contracts Become Unenforceable
Even a valid contract may become unenforceable under certain circumstances, including:
- Statute of Limitations – If too much time passes after a breach, the right to legal enforcement may expire.
- Breach of Contract – If one party fails to fulfill its obligations, the contract may be voided or altered.
- Public Policy Conflicts – Contracts that contradict established laws or ethical standards may not be upheld in court.
- Lack of Good Faith – If a party engages in deceptive practices or acts dishonestly, a court may refuse to enforce the contract.
To prevent these issues, contracts should be regularly reviewed and updated to comply with legal standards.
Frequently Asked Questions (FAQs)
1. What is the difference between a void and a voidable contract? A void contract is never legally enforceable, while a voidable contract is valid unless one party takes legal action to rescind it due to defects like misrepresentation or coercion.
2. Can a verbal agreement be legally binding? Yes, verbal agreements can be legally binding if they meet contract formation requirements. However, some contracts, such as those involving real estate, must be in writing.
3. What happens if a contract is signed under duress? A contract signed under duress (coercion or threats) is voidable. The affected party can seek legal relief to invalidate the agreement.
4. How can I ensure my contract is legally enforceable? Ensure the contract includes clear terms, mutual consent, lawful consideration, and complies with all legal formalities. Consulting an attorney is advisable for complex agreements.
5. What makes a contract illegal? A contract is illegal if it involves criminal activity, violates public policy, or contains terms that are unfairly restrictive or deceptive.
If you need more information about what makes a contract invalid, you can post your legal need on UpCounsel's marketplace. UpCounsel accepts only the top 5 percent of lawyers to its site. Lawyers on UpCounsel come from law schools such as Harvard Law and Yale Law and average 14 years of legal experience, including work with or on behalf of companies like Google, Menlo Ventures, and Airbnb.