Intentional interference with prospective economic advantage is a tort that lets you sue someone who deliberately sabotaged a business deal or financial opportunity you were pursuing with a third party. The relationship doesn’t have to be a signed contract yet. It does have to be real, and in most states you have to prove the person who disrupted it did something independently wrongful, knew what they were disrupting, intended the disruption, and caused you a measurable loss. The bar is high on purpose: courts don’t want to punish ordinary competition, so they make plaintiffs clear a specific set of hurdles before they’ll award damages.
What You Have to Prove
The Restatement (Third) of Torts: Liability for Economic Harm, published in 2020, lays out five elements. A defendant is liable if:
- The plaintiff had a reasonable expectation of economic benefit from a relationship with a third party.
- The defendant committed an independent and intentional legal wrong.
- The defendant intended to interfere with that expectation.
- The defendant’s wrongful conduct caused the expectation to fail.
- The plaintiff suffered economic loss as a result.
Most states follow this framework or something close to it. A handful still use an older balancing test from the Restatement (Second) that asks whether the conduct was “improper” without requiring an independently wrongful act, so the exact elements depend on where you file.
What Counts as a Real Business Relationship
The whole claim rests on showing you had a genuine prospect, not just a hope. A general plan to sell to the public isn’t enough. You need a specific third party and a reasonable probability that money was going to change hands.
What usually satisfies this: a history of prior dealings with the third party, an active negotiation moving toward completion, or a preliminary agreement that hadn’t been formalized yet. Courts look at how far along the parties were, whether money had already moved, how specific the terms had become, and whether both sides were behaving as if a deal was coming. Draft agreements, email chains discussing terms, and scheduled closing dates all help. Verbal assurances alone usually don’t.
If you were cold-calling potential customers and one of them picked a competitor instead, the law doesn’t treat that as the kind of relationship this tort protects.
What “Independently Wrongful” Means
This is where most claims win or lose. The California Supreme Court’s 1995 decision in Della Penna v. Toyota Motor Sales, U.S.A., Inc. set the rule that now dominates: the plaintiff has to prove the defendant’s conduct was wrongful by some measure beyond the interference itself. Winning a customer with a better price, faster service, or a better product isn’t wrongful, no matter how badly it hurts you.
Conduct that does qualify as independently wrongful includes:
- Fraud
- Defamation, such as spreading fabricated safety concerns about your product
- Threats
- Bribery, such as paying off a client’s purchasing manager
- Theft of trade secrets, such as a former employee using a stolen client list to poach accounts
- Antitrust violations
Each of these would be actionable on its own, which is the point. Aggressive-but-legal moves don’t count. Offering a lower price doesn’t count. Hiring a competitor’s key employee (where there’s no non-compete) doesn’t count. Publicly advertising that your product is superior doesn’t count. If you can’t name a specific law, regulation, or recognized tort the defendant broke, the claim will almost certainly fail.
Proving the Defendant Knew and Intended to Interfere
You have to show the defendant actually knew about your relationship with the third party and chose to disrupt it. Acting in a way that happens to hurt your business isn’t enough.
Intent can be shown two ways. One is evidence that the defendant specifically set out to destroy the relationship. The other is evidence that the defendant knew disruption was substantially certain to follow from what they did, even if that wasn’t the main goal. Either way, you need concrete proof. Internal emails about the targeted relationship, meeting notes showing strategy aimed at a particular deal, and testimony from employees who watched the decision get made all work. Direct admissions are powerful but uncommon.
You generally can’t win against a defendant who had no idea your relationship existed. A competitor who undercut your pricing on a deal they didn’t know you were chasing is competing, not interfering.
Causation and Damages
Even if every other element is in place, you need evidence that the defendant’s conduct actually caused the deal to collapse, and that you lost money because of it.
States split on the causation test. Some ask whether the deal would have gone through but for the defendant’s conduct. Others ask whether the conduct was a substantial factor in the failure. Under either test, if the deal was going to fall apart on its own, the defendant isn’t on the hook. Defendants often focus their defense here, arguing the third party had its own reasons to walk.
Damages have to be proved with reasonable certainty. Speculation won’t do. Financial records showing expected profit margins, expert testimony from accountants or industry specialists, and projections built on past performance with the same third party are the usual tools. New businesses with no track record have a hard time, because they don’t have historical numbers to anchor the projection.
Compensatory damages typically cover the profit you would have earned plus any direct costs you spent in reliance on the relationship. Punitive damages are available in cases involving malicious or outrageous behavior, but courts treat them as a deterrent and reserve them for the worst conduct.
How This Differs From Interference With an Existing Contract
The close cousin of this tort is intentional interference with contract, and the two carry different burdens. When a signed contract already exists and someone disrupts it, most courts don’t require you to prove the defendant’s conduct was independently wrongful. The contract itself is the protected interest, so the interference alone can be enough.
Prospective relationships don’t get that treatment. Because deals in progress fall apart for legitimate reasons all the time, courts give more room to third parties who might disrupt them. The independently wrongful conduct requirement is the price of that extra room, and it’s the single biggest reason prospective-advantage claims are harder to win than existing-contract claims.
Defenses You Should Expect
Fair Competition
This is the most common defense and the most powerful. A competitor can divert business to itself using fair and reasonable means without facing liability, even if the diversion destroys a relationship you were counting on. Under the independently wrongful conduct framework, the competition privilege is essentially built into your burden: if you can’t prove the conduct was independently wrongful, the privilege applies by default.
Truthful Statements and Honest Advice
Sharing accurate information about a competitor’s product, finances, or business practices generally isn’t actionable, even if the sharing is designed to talk a third party out of a deal. Honest advice is also protected. The exception is when truthful statements are paired with other improper conduct, such as threatening the third party with consequences for going through with the deal.
Corporate Officers and Advisors
Officers and directors who interfere with their own company’s business relationships while exercising legitimate business judgment get a qualified privilege. To beat it, you have to show the officer acted out of personal malice unrelated to the company’s interests. Attorneys get similar protection when advising clients not to go forward with prospective deals, even if the advice turns out to be wrong.
Deadlines to File
This is a state common law tort, so filing deadlines vary. Most states set the statute of limitations between two and five years, with three years being common. The clock typically starts when the interference happens or when you discover (or should have discovered) the harm. Missing the deadline is one of the most preventable ways to lose the claim entirely. If you suspect interference, talking to an attorney quickly matters more than having a perfect case assembled first.
Before You Sue
These cases are expensive and hard to win. The independently wrongful conduct requirement knocks out a large share of claims before trial, and proving damages with reasonable certainty drives up expert witness costs. Attorneys’ fees in commercial litigation generally aren’t recoverable by the prevailing party unless a contract or statute says so, so you’ll pay your own lawyers even if you win.
Three honest questions before filing:
- Can you point to specific wrongful conduct beyond aggressive competition? If the worst you can say is that the defendant offered better terms, you don’t have a claim.
- Can you quantify your losses with real financial data? If the deal was speculative or very early, damages will be hard to prove.
- Can you show the defendant knew about and targeted your specific relationship? If the interference was incidental to broader business activity, the knowledge and intent elements will give you trouble.
Clear answers to all three put you in a position to file. Anything less, and you’re likely to spend heavily and lose.