Material Breach vs. Minor Breach in California Contracts

Last updated: November 2026

A material breach of contract in California is a failure so serious that it defeats the purpose of the agreement and excuses the other party from performing further. A minor breach, sometimes called a partial breach, entitles the injured party to damages but not to walk away. Whether a breach is material is usually a question of fact. Kolmogorov Law, P.C. handles both sides of this question for businesses in Orange County, Los Angeles, and across California.

Call (909) 235-6116 or contact us online to discuss whether a breach lets you stop performing, or whether the other side was entitled to stop.

Why the distinction matters

Every contract dispute I handle eventually reaches this question. One side stopped paying, stopped shipping, or stopped working, and it says the other side's breach justified that. If the earlier breach was material, the party who stopped may be in the clear. If it was minor, the party who stopped has now committed the bigger breach and may owe damages for it.

The stakes are asymmetric. A business that correctly treats a material breach as the end of the contract saves itself from throwing good money after bad. A business that guesses wrong has handed the other side a lawsuit.

The material breach rule in California

When a party's failure to perform is a material breach, the other party may be discharged from further performance. (Brown v. Grimes (2011) 192 Cal.App.4th 265, 277-278.) Whether a breach is material is normally a question of fact, which means a jury or a judge sitting as the trier of fact decides it after hearing the evidence. (Ibid.) Only when reasonable minds could not differ does the court decide it as a matter of law.

For a partial breach, materiality depends on the importance or seriousness of the failure and the probability that the injured party will still receive substantial performance. (Id. at p. 278.) A material breach of one part of a contract generally counts as a material breach of the whole. (Ibid.)

The flip side is substantial performance. CACI No. 312 tells the jury that a party who has performed all or substantially all of what the contract required has performed, even if some small part was left undone or done imperfectly. The injured party is left with a claim for the shortfall, not an excuse to quit.

How courts weigh materiality

No statute lists the factors, so courts draw on the Restatement and on earlier cases. In practice the questions are these. How much of the expected benefit did the injured party lose? Can money adequately compensate that loss? Would the breaching party forfeit a great deal if the contract were treated as over? Was it likely to cure? Did it act in good faith?

I tell clients to think about it from the jury box. Would twelve people who know nothing about your industry say the other party took the heart out of the deal, or that it stumbled on a detail?

Three fact patterns from business cases

A software vendor misses the go-live date by three weeks on a twelve-month implementation. The customer refuses to pay the next milestone and hires a competitor. Three weeks on a year-long project, with no time-is-of-the-essence clause, is a hard sell as material. The customer may now be the breaching party.

A distributor is required to buy a minimum quantity each quarter and to refrain from selling competing products. It hits the minimums but starts carrying a competitor's line. The exclusivity term was the reason the manufacturer signed. That breach is likely material even though the money kept flowing.

A commercial tenant pays rent four days late once in three years, and the landlord tries to terminate. The lease language and notice provisions control, but a single late payment that was promptly cured is rarely enough to end a lease. Our guide to commercial lease disputes covers the procedure.

What the injured party can do after each kind of breach

After a minor breach, the injured party must keep performing and sue for damages. The measure is the amount that compensates for the detriment the breach caused, or that would be likely to result in the ordinary course of things. (Civ. Code, § 3300.) It cannot recover more than it would have gained from full performance on both sides. (Civ. Code, § 3358.) Our page on breach of contract damages goes further.

After a material breach, the injured party has a choice. It may treat the contract as ended, stop its own performance, and sue for damages. Or it may keep the contract alive, continue performing, and sue for the damages the breach caused. What it should not do is both: continue accepting the benefits of the contract while claiming it has been discharged.

A party who intends to treat a breach as material should say so in writing, promptly, and should point to the contract term that was broken. Silence followed by a sudden termination months later invites an argument that the breach was waived.

The contract can change the analysis

Well-drafted contracts define their own defaults. A clause may list events of default, give the breaching party a cure period after written notice, and require notice in a particular form. Where that language exists, a court will usually enforce it. A party that terminates without giving the required notice and cure period may have breached even if the underlying default was serious.

A related doctrine applies when a party announces in advance that it will not perform. That is anticipatory repudiation, covered on our page on anticipatory breach.

What we do

We read the contract and the correspondence and give a candid view of whether the breach is material. If the client wants to terminate, we draft the notice so that it follows the contract's procedure and preserves the client's claims. If the client has been accused of a material breach, we evaluate whether a cure is possible.

Disputes that do not settle are heard in the Orange County Superior Court's Central Justice Center in Santa Ana, the Los Angeles Superior Court's Stanley Mosk Courthouse, or, where the parties are from different states, the Central District of California. The elements the plaintiff must prove are on our page on the elements of breach of contract.

What to bring to the first meeting

Bring the contract, every notice or default letter either side sent, the correspondence around the breach, and a short timeline of who did what and when. Note the dates of any cure attempts. If you have already stopped performing, tell us when and why.

Frequently asked questions

What is a material breach of contract?

A material breach is a failure to perform that goes to the essence of the agreement and deprives the other party of the benefit it bargained for. It excuses the injured party from further performance. Whether a breach is material is ordinarily a question of fact for the jury, weighing the seriousness of the failure and the likelihood of substantial performance.

What is the difference between a material breach and a minor breach?

A minor breach, also called a partial breach, is a failure that leaves the injured party with most of what it bargained for. The injured party must keep performing and may sue for damages. A material breach allows the injured party to stop performing and treat the contract as ended, in addition to seeking damages.

Does a material breach void the contract?

Not automatically. A material breach gives the injured party the right to treat the contract as terminated. If the injured party instead continues to accept performance, the contract stays in force and the remedy is damages. The choice should be made deliberately and communicated in writing.

Can I stop paying if the other party breached the contract?

Only if the breach was material and your own performance was not an independent obligation. Stopping payment over a minor breach is itself a breach. Check whether the contract requires notice and a cure period before suspending performance, and consider sending a written notice that preserves your position.

Talk to a California breach of contract attorney

If your business is weighing whether to terminate a contract, or has been told it is in material breach, call (909) 235-6116 or contact us online. Kolmogorov Law, P.C. is located at 327 Magnet, Irvine, CA 92618, and represents businesses in Orange County, Los Angeles, and throughout California.

This page provides general information about California law and is not legal advice. Outcomes depend on the contract, the facts, and the court.