California contract law requires four things for an agreement to be enforceable: parties who are legally capable of contracting, mutual consent to the same terms, a lawful purpose, and consideration — something of value exchanged by each side. These requirements come from Civil Code 1550, and if any one of them is missing, the whole agreement can collapse.1California Legislative Information. California Civil Code 1550 Beyond formation, California has its own rules about which contracts must be in writing, which clauses it refuses to enforce at all, and how long you have to sue when someone breaks a deal.
What Makes a Contract Valid
A contract starts with an offer: a clear proposal to do or exchange something. Acceptance has to match the offer. Add new conditions and you’ve made a counteroffer, not an acceptance. Then there’s consideration, which is what separates a binding contract from a gift or an empty promise. Each side has to give up something of value, whether that’s money, services, a promise to act, or a promise not to act.
Both sides must actually agree to the same terms. Courts look at the written language and the parties’ conduct to decide whether real agreement existed. Vague or missing essential terms — price, quantity, what each side is supposed to do — can sink a contract, because a judge needs enough to work with to tell whether anyone performed.
Capacity is the other piece. Civil Code 1556 excludes minors, people of unsound mind, and people deprived of civil rights from the pool of people who can bind themselves to a contract.2California Legislative Information. California Civil Code 1556 You generally need to be at least 18 and mentally competent. Contracts signed by minors are usually voidable at the minor’s option, though contracts for necessities like food and shelter get different treatment. If someone genuinely lacked the mental capacity to understand what they were signing, a court can unwind the agreement.
Most California contracts don’t need a particular format. A handshake deal is technically valid outside the categories listed below. Electronic signatures carry full legal weight under California’s Uniform Electronic Transactions Act, starting at Civil Code 1633.1, and courts have found that even a typed name in an email can qualify when both parties intended to do business electronically.3Justia. CACI No. 380 – Agreement Formalized by Electronic Means
Contracts That Must Be in Writing
California’s Statute of Frauds, Civil Code 1624, lists the categories where you need a signed writing to enforce the deal:4California Legislative Information. California Civil Code 1624
- Agreements that by their terms can’t be fully performed within one year of signing.
- Promises to cover another person’s debt.
- Real estate sales, leases longer than one year, and other agreements creating or transferring interests in land.
- Sales of goods worth $500 or more, under California Commercial Code 2201.5California Legislative Information. California Commercial Code 2201
The writing doesn’t have to be a formal contract. Emails, letters, or a collection of documents that together spell out the essential terms can be enough, as long as the party you’re trying to hold to the deal signed something. Real estate gets the strictest treatment: California courts routinely refuse to enforce oral promises about land, and they’ve thrown out oral modifications to written loan agreements for the same reason. If property is involved, put it in writing.
When a Court Will Refuse to Enforce a Contract
Even a signed agreement can fail. If essential terms are too vague for a court to apply, enforcement goes nowhere. If the contract’s purpose is illegal, Civil Code 1667 voids it. A clause that waives minimum wage or overtime, for example, can’t be enforced because it conflicts with Labor Code protections.
Courts can also strike down contracts as unconscionable. The analysis has two sides, and a contract usually needs some of each to be invalidated. Procedural unconscionability looks at how the contract was formed: take-it-or-leave-it terms, important clauses buried in fine print, deliberately confusing language, lopsided bargaining power. Agreements obtained through duress, threats, fraud, or undue influence can also be voidable under Civil Code 1567.6California Legislative Information. California Civil Code 1567
Substantive unconscionability looks at what the contract says. Extreme penalties, waivers of basic legal rights, or terms that overwhelmingly favor one side are candidates for invalidation. Civil Code 1670.5 gives judges three options when they find unconscionability: refuse to enforce the whole contract, strike the offending clause, or limit its application to avoid an unfair outcome.7California Legislative Information. California Civil Code 1670.5 California courts have used these tools to knock out mandatory arbitration clauses that effectively blocked employees from pursuing wage claims.
Non-Compete Clauses Are Almost Always Void
California stands apart from most states on non-competes. Business and Professions Code 16600 voids any contract that restrains someone from working in a lawful profession, trade, or business.8California Legislative Information. California Business and Professions Code 16600 The statute is written broadly on purpose. It doesn’t matter how narrowly tailored the clause is, and courts have struck down the creative workarounds employers have tried.
SB 699, effective in 2024, extended the ban further. It applies the California rule even to non-competes signed in other states, and it prohibits employers from trying to enforce a void non-compete against anyone who currently works or formerly worked in California.9California Legislative Information. Senate Bill 699 An employee can sue for an injunction and actual damages if an employer tries to enforce a void clause, and a prevailing employee can recover attorney fees.
A few narrow exceptions survive, mostly for the sale of a business, dissolution of a partnership, or dissolution of an LLC, where a seller or departing owner agrees not to compete within a defined area. Outside those situations, if you’re an employee or independent contractor in California, a non-compete clause in your contract is almost certainly unenforceable.
Suing for Breach of Contract
Not every slip-up is worth suing over. California courts distinguish minor breaches from material ones. A material breach defeats the central purpose of the contract — the supplier that never delivers at all, not the supplier that delivers two days late. Courts weigh the severity of the breach, how much of the deal was performed, and whether the non-breaching party still got meaningful value.
To win, you have to prove four things:
- A valid contract existed.
- You performed your side of the deal, or were excused from performing because the other side breached first.
- The other party failed to perform.
- You suffered damages as a result.
Written communications, invoices, performance records, and correspondence all serve as evidence.
You also have a duty to limit your losses once a breach happens. Civil Code 3358 caps recoverable damages at what you would have made if the contract had been fully performed.10California Legislative Information. California Civil Code 3358 In practice, you’re expected to take reasonable steps to minimize the damage. If a buyer backs out, you need to try to find another buyer rather than letting goods sit and then suing for the full price. Failing to mitigate can shrink or wipe out the damages a court awards.
What You Can Recover
The goal of contract damages is to put the injured party in the position they would have been in if the deal had been performed. Civil Code 3300 is the measuring stick: damages must compensate for all harm “proximately caused” by the breach or that would “in the ordinary course of things” flow from it.11California Legislative Information. California Civil Code 3300
Compensatory damages come in two flavors. General damages cover the direct loss — the gap between what you were promised and what you got. Consequential damages cover foreseeable downstream losses, like the profits you lost on a resale deal that collapsed because your supplier didn’t deliver. Damages have to be reasonably certain. Speculative future profits generally won’t fly.
Punitive damages are off the table in a straight contract case. Civil Code 3294 restricts them to claims involving “oppression, fraud, or malice” arising from obligations “not arising from contract.”12Justia. California Civil Code Article 3 – Exemplary Damages You can only reach punitives when the breach is tangled up with tortious conduct, like fraud in forming the contract. A plain failure to perform, however infuriating, won’t support them.
When money can’t fix things, a court may order the breaching party to actually do what they promised. Civil Code 3384 is the basis for specific performance.13California Legislative Information. California Civil Code 3384 It comes up most often in real estate, where every parcel is treated as unique and a cash award can’t replace the specific property you contracted to buy. Injunctive relief works the other way: it blocks someone from doing something that violates the deal, such as misusing confidential information or trade secrets.
Deadlines to Sue
You don’t have forever. California sets different windows depending on whether the contract was written or oral:
- Written contracts: four years from the date of the breach, under Code of Civil Procedure 337.14California Legislative Information. California Code of Civil Procedure 337
- Oral contracts: two years from the date of the breach, under Code of Civil Procedure 339.15California Legislative Information. California Code of Civil Procedure 339
The clock usually starts on the date of the breach, not the date you discover it, though limited exceptions exist for fraud-based claims where the breach was concealed. Miss the deadline and a court will almost certainly dismiss the case no matter how strong it was.
Attorney Fees and Filing Costs
By default in American courts, each side pays its own attorney fees whether they win or lose. California keeps that rule but adds a twist: Civil Code 1717 converts any one-sided attorney fee clause into a two-way street.16California Legislative Information. California Civil Code 1717 If a lease or contract says only the landlord or only the business can recover fees, California law lets whichever side wins collect from the loser. A clause meant to protect one party becomes a risk for that same party if they lose. Check for one before you sign, and before you sue.
Filing fees in California Superior Court scale with the amount in dispute. As of January 2026, a claim up to $10,000 costs $225 to file; claims over $10,000 up to $35,000 cost $370; and claims above $35,000 cost $435.17California Courts. Statewide Civil Fee Schedule Effective January 1, 2026
For smaller disputes, small claims court is faster and cheaper, with filing fees between $30 and $75. Individuals can sue for up to $12,500; businesses are capped at $6,250.18California Courts. Small Claims in California Neither side can bring an attorney to the hearing, and the process is more informal. For contract disputes under the small claims limit, it’s often the most practical route.