Affirmative Defenses to Breach of Contract

When facing a breach of contract lawsuit, understanding and asserting the right affirmative defenses can make a critical difference. Affirmative defenses to breach of contract allow defendants to challenge the enforceability of a contract or to reduce liability by addressing issues such as fraud, duress, or lack of consideration. By strategically using these breach of contract affirmative defenses, defendants can often mitigate damages or avoid liability entirely. Knowing the range of defenses to breach of contract—from statute of limitations to impossibility of performance—provides valuable tools for anyone involved in contract disputes. This guide explores common breach of contract defenses with examples and pleading language to illustrate how they are applied in legal practice.

By Brad Nakase, Attorney

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Effectively defending against a breach of contract claim requires asserting specific affirmative defenses. The right breach of contract affirmative defenses can help defendants reduce or eliminate liability. Here are some common and essential affirmative defenses to breach of contract, explaining how each defense can be strategically employed.

1. Lack of Consideration

One of the primary defenses to breach of contract is the lack of consideration. Consideration is what each party provides to support the contract, and without it, a contract may be invalid. Lack of consideration serves as a robust breach of contract defense because it questions the mutual exchange required for a binding agreement. Raising this defense is essential to show why breach of contract defenses may apply.

Example: A contract for services is formed, but one party does not offer any compensation or benefit in return. Without consideration, the contract lacks a fundamental component and may be invalid.

Pleading Language: “As a defense to the breach of contract, Defendant alleges lack of consideration, as the contract fails to include mutual benefit or exchange between the parties.”

Why This Defense Works: Lack of consideration is a potent breach of contract affirmative defense because it addresses the core requirements of a valid contract. This defense challenges the agreement’s enforceability by arguing that a key element is missing, thus excusing the defendant from liability.

2. Mistake

Mutual mistake is another affirmative defense to breach of contract, especially if both parties misunderstood key facts. If a contract was based on false assumptions, this mistake can provide a defense to breach of contract claims. This breach of contract affirmative defense is often crucial in contracts involving complex terms or significant miscommunication.

Example: Two parties enter into a contract believing a particular product is available, but it later turns out that the product was discontinued. The mutual mistake may void the contract.

Pleading Language: “Defendant asserts mistake as an affirmative defense to breach of contract, as both parties based the contract on a misunderstanding of a fundamental fact.”

Why This Defense Works: Mistake is a recognized defense to breach of contract, as it allows a party to argue that the contract was based on erroneous information. This defense can protect the defendant from liability where the terms were misunderstood or assumed incorrectly.

3. Fraud or Misrepresentation

Fraud is one of the most powerful breach of contract affirmative defenses, especially if one party misled the other. If false information was provided, a defendant can argue that the contract is void. Fraud or misrepresentation challenges the contract’s validity and serves as a complete defense to breach of contract liability.

Example: A seller misrepresents the condition of a product, claiming it’s new when it’s refurbished. The buyer can raise fraud as a breach of contract affirmative defense.

Pleading Language: “Defendant asserts fraud as a defense to breach of contract, claiming that the Plaintiff misrepresented material facts upon which Defendant relied.”

Why This Defense Works: Fraud or misrepresentation is a powerful affirmative defense to breach of contract because it addresses the contract’s legitimacy. If one party entered the contract based on false information, they are not bound to honor the agreement.

4. Duress

Duress, which involves coercion, is a powerful defense to breach of contract, voiding a contract signed under pressure. If a contract was signed involuntarily, it could be rendered unenforceable. This defense falls among the most critical breach of contract defenses since it argues that there was no genuine consent.

Example: A party is forced to sign a contract under the threat of physical harm. The party may raise duress as a defense to breach of contract.

Pleading Language: “Defendant alleges duress as a breach of contract affirmative defense, as Defendant was coerced into signing the contract under extreme pressure.”

Why This Defense Works: Duress is a compelling affirmative defense to breach of contract, as it establishes that the defendant did not enter into the contract voluntarily. This defense can effectively invalidate the contract and excuse the defendant from liability.

5. Unconscionability

When contract terms are excessively unfair, unconscionability can serve as an affirmative defense to breach of contract. Courts may refuse to enforce a one-sided contract if it’s deemed unconscionable. This defense protects parties from contracts that would otherwise lead to unjust outcomes and strengthens breach of contract defenses against unfair demands.

Example: A lender charges exorbitant interest rates in a loan contract, exploiting the borrower’s lack of bargaining power. The borrower may argue unconscionability as a defense.

Pleading Language: “As an affirmative defense to breach of contract, Defendant asserts unconscionability, as the contract terms are excessively unfair and unjust.”

Why This Defense Works: Unconscionability is an effective defense to breach of contract when the agreement is one-sided and unreasonable. This defense prevents enforcement of contracts that shock the conscience due to exploitation or unfair terms.

6. Statute of Limitations

The statute of limitations is a robust defense to breach of contract claims, as each state has a set time limit. Filing outside this period generally bars the claim, making it an essential breach of contract affirmative defense. If the timeframe has lapsed, the defendant may avoid liability entirely.

Example: A party files a breach of contract claim five years after the breach, exceeding the statute of limitations. The defendant can use this as a breach of contract defense.

Pleading Language: “Defendant pleads statute of limitations as an affirmative defense, asserting that the Plaintiff’s claim is barred by the expiration of the statutory period.”

Why This Defense Works: The statute of limitations is a strong affirmative defense to breach of contract, as it bars claims brought after the legal time limit. This defense can prevent liability if the claim is filed too late.

7. Impossibility of Performance

This breach of contract affirmative defense applies when circumstances make it impossible to fulfill obligations. Impossibility may arise from unforeseen events, like natural disasters. By asserting this defense, the defendant can argue that performance was genuinely unfeasible, strengthening their defenses to breach of contract.

Example: A contractor is hired for a project, but a new zoning law prevents construction. Impossibility of performance serves as a valid defense to breach of contract.

Pleading Language: “Defendant asserts impossibility of performance as an affirmative defense, arguing that circumstances beyond Defendant’s control rendered performance unachievable.”

Why This Defense Works: Impossibility of performance is a recognized breach of contract affirmative defense, especially when unexpected events make performance unfeasible. This defense protects defendants from liability when fulfilling the contract is impossible.

8. Waiver

Waiver occurs when one party knowingly relinquishes a contract right, making it a powerful breach of contract defense. If a plaintiff waived certain terms, this serves as an affirmative defense. This defense demonstrates that the plaintiff accepted the alleged breach, reinforcing the defendant’s defenses to breach of contract.

Example: A landlord repeatedly allows late rent payments without penalty. The tenant could argue waiver as a defense to a later breach of contract claim for late payments.

Pleading Language: “Defendant alleges waiver as an affirmative defense to breach of contract, as Plaintiff’s conduct demonstrated acceptance of the alleged breach.”

Why This Defense Works: Waiver is an effective defense to breach of contract, as it shows that the plaintiff knowingly relinquished their rights. This defense can bar liability if the plaintiff’s actions imply acceptance of the breach.

9. Accord and Satisfaction

Accord and satisfaction offer an effective breach of contract affirmative defense when the parties agree on alternate performance. Raising accord and satisfaction as a defense argues that mutual agreement prevents further claims, often reducing liability.

Example: A client accepts partial payment in settlement of a larger debt. The debtor can raise accord and satisfaction as an affirmative defense.

Pleading Language: “Defendant asserts accord and satisfaction as a defense to breach of contract, contending that Plaintiff accepted substitute performance as fulfillment of the contract.”

Why This Defense Works: Accord and satisfaction is a valid breach of contract defense when the parties agree to new terms. This defense demonstrates mutual agreement, preventing further claims.

10. Prior Breach by Plaintiff

If the plaintiff breached first, this serves as an affirmative defense to breach of contract. Prior breach argues that the plaintiff’s initial failure to perform releases the defendant from obligations. Using this breach of contract defense shows the defendant was not obligated to fulfill the remaining terms.

Example: A client fails to pay as required, but still demands service. The service provider may raise prior breach by plaintiff as an affirmative defense to breach of contract.

Pleading Language: “Defendant asserts prior breach by Plaintiff as an affirmative defense to breach of contract, arguing that Plaintiff’s own breach invalidates further obligations.”

Why This Defense Works: Prior breach by the plaintiff is a recognized breach of contract affirmative defense, excusing the defendant from performance if the plaintiff breached first.

11. Failure to Mitigate Damages

Failure to mitigate damages is another affirmative defense to breach of contract. Plaintiffs are required to minimize their losses after a breach. This breach of contract defense can lower the claim value if the plaintiff ignored cost-effective steps to reduce damages.

Example: A landlord fails to find a replacement tenant after a lease breach. The tenant can use failure to mitigate damages as an affirmative defense to breach of contract.

Pleading Language: “Defendant asserts failure to mitigate damages as a defense to breach of contract, as Plaintiff neglected reasonable steps to minimize their losses.”

Why This Defense Works: Failure to mitigate damages is a strong breach of contract defense, as it requires the plaintiff to limit their losses. This defense can reduce the damages awarded if the plaintiff failed to act prudently.

12. Lack of Capacity

If a party lacked the mental capacity to contract, this serves as a powerful breach of contract affirmative defense. Lack of capacity may apply to minors or mentally impaired individuals. This defense nullifies the contract and strengthens the defendant’s defenses to breach of contract.

Example: A minor signs a long-term contract, which may be voided due to lack of capacity. The minor can raise this as an affirmative defense to breach of contract.

Pleading Language: “Defendant pleads lack of capacity as a breach of contract affirmative defense, asserting that Defendant was legally incapable of entering the contract.”

Why This Defense Works: Lack of capacity is an essential defense to breach of contract when the defendant cannot legally consent. This defense invalidates the contract if one party was legally unfit to agree.

13. Illegality

Illegality is one of the strongest breach of contract affirmative defenses if the contract involved unlawful activities. Illegal contracts are unenforceable, providing a complete defense to breach of contract claims. Asserting illegality can eliminate the claim entirely.

Example: A contract requires services that violate local laws. The defendant can argue illegality as a breach of contract defense.

Pleading Language: “Defendant asserts illegality as an affirmative defense to breach of contract, claiming that the contract’s purpose is unlawful.”

Why This Defense Works: Illegality is a strong breach of contract affirmative defense that bars enforcement of contracts with illegal purposes. This defense prevents liability when the contract itself is unlawful.


These breach of contract defenses can provide substantial protection against liability. Each defense underscores why breach of contract affirmative defenses are essential, as they safeguard defendants from unfair claims. By utilizing these defenses to breach of contract, defendants can limit exposure to damages and challenge the validity of the claim.

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