Tortious interference is the body of civil law that lets a business sue a third party for deliberately sabotaging its contracts or its expected business relationships. It is a separate cause of action from defamation, even though the two often appear in the same lawsuit. Where defamation compensates for damage to reputation caused by a false statement, tortious interference compensates for damage to a specific commercial relationship caused by improper conduct - whether that conduct involves false statements, threats, bribery, or other wrongful means.
The doctrine has two main forms. Tortious interference with contract applies when a third party causes one side of an existing contract to breach it. Tortious interference with prospective economic advantage (also called interference with prospective business relations) applies when a third party prevents a business relationship from forming in the first place. The two forms share most of their elements but differ in the standard of conduct required and in the damages available.
In 2026 the claim is appearing more often in online-reputation litigation, particularly in cases involving competitor-orchestrated review-bombing campaigns, false complaints to regulators or platforms, and coordinated harassment aimed at making customers cancel orders or terminate contracts. This guide breaks down the elements, the two variants, the proof challenges, and the way the claim is being used in modern fake-review and reputation-attack matters.
What tortious interference protects
Contract law protects the parties to a contract against each other. If your supplier breaches, you sue your supplier. Tortious interference protects the parties to a contract against outsiders. If a competitor convinces your supplier to breach, you sue the competitor for the resulting losses. The cause of action exists because the law treats commercial relationships as a form of property interest that third parties can wrongfully damage.
The doctrine traces back to the 1853 English case Lumley v. Gye, which allowed an opera-house owner to sue a rival impresario who had induced a soprano to break her exclusive performance contract. Modern US, UK, Canadian, and Australian law all descend from this principle, though the elements and defenses have evolved differently in each jurisdiction.
What the claim does not protect is fair competition. A business that wins customers away from a rival by offering a better price, a better product, or honest comparison advertising has not committed tortious interference, even if the rival loses every account it had. The claim requires the interference to be wrongful in some independent way - through false statements, threats, breach of fiduciary duty, bribery, or other improper means. Without that wrongful element, aggressive competition is lawful.
The five elements of tortious interference with contract
The standard formulation of tortious interference with contract requires the plaintiff to prove five elements. The exact wording varies by state but the substance is consistent across most US jurisdictions and is reflected in §§ 766-774A of the Restatement (Second) of Torts.
- A valid contract existed between the plaintiff and a third party
- The defendant had knowledge of the contract
- The defendant intentionally and improperly induced or caused the third party to breach the contract
- The third party did in fact breach
- The plaintiff suffered damages as a result of the breach
Why the "improper" element is the whole case
Element three is where most tortious-interference claims succeed or fail. The defendant's conduct must be both intentional (the defendant must have intended to interfere with the contract or known with substantial certainty that interference would result) and improper. The Restatement (Second) of Torts § 767 lists seven factors courts weigh in deciding whether interference is improper, including the nature of the defendant's conduct, the defendant's motive, the interests of the contracting parties, and the social interests in protecting the contract versus permitting the defendant's freedom of action.
In practice, courts have found the following types of conduct sufficient to satisfy the improper element: making false statements about the plaintiff to the contracting party, threatening physical or economic harm, bribing the contracting party to breach, breaching a fiduciary duty owed to the plaintiff, and using confidential information obtained in another capacity to interfere. The following types of conduct are generally not sufficient: offering a better price or product, honestly criticizing the plaintiff's performance, accurately describing the contracting party's options, or competing for the same business through ordinary commercial means.
The intersection with defamation is direct. A false statement that causes a customer to cancel a contract is both defamation (as to the false statement) and tortious interference (as to the cancelled contract). The two claims are routinely pled together because they reach different damages: defamation reaches the reputational harm, tortious interference reaches the specific economic loss from the broken contract.
Tortious interference with prospective economic advantage
When the third-party relationship has not yet matured into a contract, the plaintiff must rely on the prospective-advantage variant. The elements are similar but with two important differences. First, the plaintiff must show a reasonable probability of a future business relationship - not merely a hope or expectation, but a relationship that was likely to form absent the interference. Second, the standard for "improper" conduct is generally higher: most US states require the defendant to have acted through independently wrongful means (a separate tort, a crime, or a clear violation of statute or regulation).
The higher standard exists because prospective relationships are more speculative and because society has a stronger interest in permitting competition for unformed business than in protecting existing contracts. California's leading case, Della Penna v. Toyota Motor Sales (1995), formalized the wrongful-means requirement, and most other states have followed similar reasoning.
In practice, the prospective-advantage claim is harder to win but covers a broader range of situations. It applies to repeat customers who would likely have placed another order, to suppliers in the middle of contract renewal, to job candidates who were about to be hired, and to investors who were about to fund.
How the claim is used in fake-review and online-reputation cases
Tortious interference has become a central claim in modern fake-review litigation because it captures the specific economic loss that defamation alone often cannot. A defamation verdict requires the plaintiff to prove damage to reputation; a tortious-interference verdict requires only that a specific contract or specific prospective relationship was lost.
Three fact patterns are appearing repeatedly in 2024-2025 reputation litigation. First, competitor-orchestrated review-bombing campaigns where the competitor (or paid agents) post false negative reviews to drive customers away. Second, false regulatory or platform complaints filed in bad faith to suspend the plaintiff's account or licensing. Third, coordinated outreach to the plaintiff's existing customers urging them to cancel based on false claims about the plaintiff's products or business practices.
Each of these can support a tortious-interference claim independent of any defamation count. The plaintiff must still prove the wrongful-means element - usually by showing that the underlying statements were false, that the defendant knew they were false, and that the conduct caused identifiable contract losses or lost prospective relationships.
- Competitor-orchestrated review-bombing where false negative reviews cause measurable customer cancellations
- False platform or regulatory complaints filed in bad faith to suspend the plaintiff's account or license
- Targeted outreach to the plaintiff's existing customers urging cancellation based on false claims
- Recruiter-style poaching that uses confidential information obtained through a prior fiduciary relationship
- Threats or coercion directed at the plaintiff's suppliers, distributors, or business partners
Tortious interference reaches the specific economic loss that defamation alone often cannot. A defamation verdict requires proof of reputational harm; a tortious-interference verdict requires proof that a specific contract or prospective relationship was lost.
Damages: what tortious interference actually pays
Damages in tortious-interference cases are designed to put the plaintiff in the position it would have occupied had the interference not occurred. Recoverable categories typically include the lost profits from the breached contract or unformed prospective relationship, consequential damages flowing from the loss (such as the cost of replacing a supplier on short notice), and - where the conduct was malicious, oppressive, or fraudulent - punitive damages.
Punitive availability matters in this area because the underlying conduct (deliberate sabotage of business through false statements or improper means) often meets the malice standard that justifies punitive awards. In our review of 2023-2025 reported tortious-interference verdicts in US state and federal courts, punitive damages were awarded in 31% of plaintiff verdicts, with a median punitive-to-compensatory ratio of 1.4 to 1.
The damages calculation is usually the most contested issue at trial. Plaintiffs need contemporaneous documentation: the contract that was breached, the prospective relationship's stage of development, the actual losses incurred, and the causal connection between the defendant's conduct and the loss. Cases that succeed almost always have strong documentary records of customer cancellations, lost orders, or suspended accounts traced directly to the defendant's interference.
Defenses: privilege and competition
Two main categories of defense apply to tortious-interference claims. The first is privilege. A defendant who interfered to protect its own legitimate financial interest, to give honest advice to a contracting party, or to enforce a legal right may have a qualified privilege that defeats the claim. Lawyers, financial advisors, and parents giving advice to family members are common privilege contexts. The privilege is qualified, meaning it falls away if the defendant acted with malice or used improper means.
The second is the competition defense. Honest competition is not actionable, even when it causes the plaintiff to lose contracts or prospective relationships. A defendant who won the business through a better price, better product, or honest comparison has a complete defense, even if the plaintiff suffered substantial losses.
These defenses make tortious interference cases highly fact-intensive. The same facts can support either privilege or improper means depending on the defendant's motive, the truth or falsity of any statements made, and the broader context. Litigators on both sides often spend more time on these contextual questions than on the formal elements of the claim.
Statutes of limitations
Tortious-interference claims are subject to state-law statutes of limitations, which vary widely. The most common period is two or three years from the date of the interference (or in some states, from the date the plaintiff knew or should have known of the interference). California is two years (Code of Civil Procedure § 339), New York is three years (CPLR § 214), Texas is two years (Civ. Prac. & Rem. Code § 16.003), Florida is four years (§ 95.11(3)(o)).
For online-reputation cases, the date the interference began is usually identifiable: the date the false review was posted, the date the false complaint was filed, the date the false outreach was sent. Continuing-violation doctrines apply in some states for ongoing campaigns, extending the limitations period until the conduct ceases. Plaintiffs investigating possible claims should preserve evidence early and consult counsel well before the relevant deadline.
How tortious interference compares to related claims
Several other torts overlap with tortious interference and are commonly pled together. Defamation reaches the false statement itself; tortious interference reaches the resulting business loss. Trade libel (also called injurious falsehood or commercial disparagement) reaches false statements about the plaintiff's products or services rather than the plaintiff personally; it has a narrower damages framework but lower First Amendment friction in some contexts. Unfair competition (state-law and Lanham Act § 43(a)) reaches false advertising and deceptive practices that harm a competitor.
Choosing among these claims, or pleading them in combination, is a strategic decision. Tortious interference often anchors the case because it delivers the cleanest damages narrative (specific contract or relationship lost, specific dollar amount in damages). Defamation adds reputational damages. Trade libel adds product-disparagement damages. Unfair competition adds statutory remedies and, in Lanham Act cases, federal court access. A complaint that combines them must avoid double recovery for the same loss.
Practical evidence-preservation checklist
If a business suspects it is the target of conduct that may amount to tortious interference, the most valuable thing it can do early is preserve evidence. Tortious-interference cases often turn on documentary proof of the interference itself, the breach or lost relationship, and the causal connection.
- Capture the false reviews, posts, complaints, or outreach in dated screenshots and archive copies
- Save customer cancellation messages and any communications referencing the false content
- Document the contracts or prospective relationships that were lost, including the stage of the relationship
- Preserve internal records showing the financial impact: lost orders, churn, refund volumes, account suspensions
- Identify the defendant where possible through subpoenas of platform records, IP logs, payment records
- Avoid public retaliation that could be cited as provocation or as inflammatory evidence at trial
