Intentional Interference With Contractual Relations: CA Elements

To sue someone in California for intentional interference with contractual relations, you must prove six elements under California Civil Jury Instructions (CACI) No. 2201, the defendant must be an outsider to your contract, and you must file within two years. Win, and you can recover the financial losses the disruption caused — and, in egregious cases, punitive damages on top.

The Six Elements You Have to Prove

CACI No. 2201 requires a plaintiff to establish each of the following:

A valid contract existed between you and another party.
The defendant knew about that contract.
The defendant’s conduct prevented performance or made it harder or more expensive.
The defendant acted intentionally — either aiming to disrupt the contract or knowing disruption was substantially certain to result.
You suffered real financial harm.
The defendant’s conduct was a substantial factor in causing that harm.¹

The “substantial factor” piece trips up cases where the contract was already failing. You don’t need to prove the defendant was the only cause, but their role can’t be trivial or remote. If the deal would have collapsed anyway, causation becomes the weak point.

Who You Can Sue (and Who You Can’t)

This tort reaches only strangers to the contract. A party to the agreement cannot be sued in tort for interfering with its own contract — if your business partner breaches, your claim against them is breach of contract, not interference.¹

A “stranger” is someone who isn’t a party and isn’t acting as an agent for a party. Even people the contract contemplates — say, a named subcontractor in a general contractor’s deal — can be liable if they’re not themselves parties and the other elements hold.

What Counts as a Valid Contract

California law requires four things for a valid contract: parties with legal capacity, mutual consent, a lawful purpose, and consideration.² If the underlying agreement is unenforceable — illegal purpose, incapacity — it generally cannot anchor an interference claim, and only a claim for interference with prospective economic advantage remains available.¹

Oral agreements count if they meet all validity requirements. So do at-will contracts, with one catch: California’s Supreme Court requires that interference with an at-will employment contract also involve conduct that was independently wrongful — illegal or wrongful for reasons beyond the interference itself. The reasoning is that at-will arrangements can be ended by either side at any time, so competition over them gets more legal breathing room.

Proving Knowledge and Intent

You need evidence of actual knowledge. A vague sense of “some deal” won’t carry it, but the defendant also doesn’t need to have read your contract line by line — awareness of the relationship and its general nature typically suffices. “Should have known” is not enough.¹

Intent is the heart of the claim. Either the defendant acted with the purpose of disrupting your contract, or they knew disruption was substantially certain to follow. Carelessness doesn’t qualify, no matter how damaging.¹

Direct admissions are rare. Most cases turn on circumstantial evidence — internal emails, communications with your contracting partner, patterns of targeted conduct. Litigation here lives and dies on the paper trail.

Existing Contract vs. Prospective Relationship

Picking the wrong claim can sink the case. Interference with an existing contract and interference with a prospective economic relationship are two different torts in California with meaningfully different standards.

In Della Penna v. Toyota Motor Sales, U.S.A., Inc. (1995), the California Supreme Court held that where no binding contract exists, the plaintiff must prove the defendant’s conduct was “wrongful by some legal measure other than the fact of interference itself.” Interference alone isn’t enough — the method has to be independently illegal or wrongful.³

With an existing contract, that extra requirement generally does not apply (the narrow exception again being at-will employment). The court reasoned that a formal contract reflects a settled economic commitment deserving stronger protection, while unformed relationships “subsist in a zone where the rewards and risks of competition are dominant.”³

The practical difference: with a signed supply contract and a competitor who lured your supplier away, you don’t need to prove any separate legal wrong. If you were only negotiating and the deal was never finalized, you’d need to show the competitor used fraud, threats, or some other wrongful means. The elements for the prospective-advantage claim are laid out in CACI No. 2202.⁴

Defenses You Should Expect

Even when the six elements are met, defendants have affirmative defenses — and they bear the burden of proving them.

Protecting Their Own Economic Interest

Under CACI No. 2210, a defendant can show they had an existing economic interest in the contractual relationship, acted solely to protect it, behaved reasonably and in good faith, and used appropriate means. A landlord pressuring a tenant to drop a subcontractor whose work threatens the property is the standard illustration. The privilege collapses if the real motivation was to harm the plaintiff rather than protect the defendant’s stake.⁵

Telling the Truth

Giving truthful information to a third party is not improper interference in California, even if it causes a breach. The Court of Appeal confirmed this in Francis v. Dun & Bradstreet, Inc. (1992), holding that truthfully informing creditors about a party’s ability to pay cannot support an interference claim. Motive is largely beside the point when the information is accurate.⁶

Legitimate Competition

Offering better pricing or a superior product that leads someone to break an existing deal can be defensible if the competitor didn’t use wrongful means. Courts weigh conduct, motivation, and social utility. Purely malicious interference — where harming you is the whole point — falls outside any privilege.

What You Can Recover

Damages aim to put you where you’d have been had the contract been performed. That usually means lost profits over the remaining life of the agreement, or the value of the specific benefits the contract promised.

Lost profits almost always need expert testimony, and courts throw out speculative projections. A fixed-price supply contract makes the math easier. Variable or uncertain revenue streams make damages the most contested part of the case.

You also have a duty to mitigate. If a replacement contract was available on similar terms and you didn’t pursue it, the defendant can argue your damages should be reduced by what you could have saved.

Punitive Damages

Because this tort involves “an obligation not arising from contract,” California Civil Code Section 3294 allows punitive damages when the defendant acted with oppression, fraud, or malice. The burden of proof is clear and convincing evidence — higher than the usual preponderance standard.⁷

Malice under the statute means conduct intended to injure, or despicable conduct done with willful disregard for others’ rights. Oppression means despicable conduct inflicting cruel hardship in conscious disregard of someone’s rights. Fraud means intentional misrepresentation or concealment of a material fact meant to deprive someone of property or legal rights. Courts weigh the severity of the misconduct and the defendant’s financial condition when setting the award.⁷

When the defendant is a business, Section 3294 adds another layer: the employer must have had advance knowledge of the employee’s unfitness and hired them with conscious disregard, or an officer, director, or managing agent must have authorized, ratified, or personally committed the wrongful conduct.⁷

Attorney’s Fees

California follows the American Rule: each side pays its own fees unless a statute or contract says otherwise. No statute authorizes fee-shifting for this tort. Unless the underlying contract contains a fee-shifting clause you can leverage, plan on paying your own legal costs even if you win.

You Have Two Years

Code of Civil Procedure Section 335.1 gives you two years to file, running from when you know or reasonably should know that interference occurred and caused you harm.⁸ In practice, that often tracks the date the contract was disrupted, not the date you figured out who was behind it. Two years sounds like plenty until you factor in the time needed to gather evidence of someone else’s intent, which is usually the most resource-intensive part of the case. If you suspect interference, talk to a lawyer early.

1
Justia. CACI No. 2201 Intentional Interference With Contractual Relations – Essential Factual Elements
2
California Legislative Information. California Civil Code 1550 – Essentials of Contract
3
Justia Law. Della Penna v Toyota Motor Sales USA Inc
4
Justia. CACI No. 2202 Intentional Interference With Prospective Economic Relations – Essential Factual Elements
5
Justia. CACI No. 2210 Affirmative Defense – Privilege to Protect Own Economic Interest
6
Justia Law. Francis v Dun and Bradstreet Inc
7
California Legislative Information. California Civil Code 3294 – Exemplary Damages
8
California Legislative Information. California Code of Civil Procedure 335.1