A California cross-complaint is a pleading a defendant files to assert their own claims — against the plaintiff, a co-defendant, or a new party who isn’t yet in the case. It is governed mainly by sections 426 and 428 of the Code of Civil Procedure, and its most consequential feature is timing: some cross-complaints are compulsory, and skipping them permanently bars you from raising those claims later.
What You Can Claim and Against Whom
A party who has been sued can bring two kinds of claims in a cross-complaint. Any cause of action you have against the party who sued you, whether or not it relates to the original lawsuit. And claims against people who aren’t parties yet, but only if those claims arise out of the same events, property, or controversy as the original suit.1California Legislative Information. California Code of Civil Procedure CCP 428.10 – Filing of Cross-Complaint
That second category is where cross-complaints get strategically interesting. A general contractor sued by a property owner for defective work can cross-complain against the subcontractor whose work caused the defect, pulling a new party into the case. The requirement is a factual link between the original claims and the cross-complaint claims.
Anyone can be joined as a cross-complainant or cross-defendant as long as joinder would have been proper if the cross-complaint had been filed as its own lawsuit.2California Legislative Information. California Code of Civil Procedure 428.20 One boundary worth flagging: you cannot file a cross-complaint against a plaintiff in an eminent domain case.
The Compulsory Cross-Complaint Rule
This is the part that catches defendants off guard. California requires you to file a cross-complaint for any “related cause of action” you have against the plaintiff at the time you serve your answer. If you don’t, you are permanently barred from raising that claim in a future lawsuit.3California Legislative Information. California Code of Civil Procedure 426.30
A related cause of action is one arising out of the same transaction, occurrence, or series of transactions or occurrences as the plaintiff’s claims.4California Legislative Information. California Code of Civil Procedure CCP 426.10 The connection doesn’t have to be tight, just rooted in the same facts. If your landlord sues you for unpaid rent and you have habitability claims that would justify a rent reduction, those claims are related. Miss them now and you can’t sue on them later.
Two narrow exceptions apply. The bar doesn’t attach if the court lacked personal jurisdiction over the party who failed to file, or if that party never filed an answer to the complaint at all.3California Legislative Information. California Code of Civil Procedure 426.30 The second makes sense: if you defaulted rather than answered, the moment when the cross-complaint was required never arrived.
Unrelated claims are permissive rather than compulsory. You may bring them in the same case, but nothing forces you to, and you keep the right to file them separately.
Filing Deadlines
Timing depends on who you’re cross-complaining against.
Against the party who sued you: file before or at the same time as your answer to the complaint.5California Legislative Information. California Code of Civil Procedure 428.50 An answer in an unlimited civil case is generally due 30 days after service, so that’s the practical window.
Against someone other than the party who filed the original complaint or cross-complaint: file any time before the court sets a trial date.5California Legislative Information. California Code of Civil Procedure 428.50 That extra room matters when you’re still figuring out which third parties belong in the case.
Miss either deadline and you need leave of court. A judge can allow a late cross-complaint “in the interest of justice at any time during the course of the action.”5California Legislative Information. California Code of Civil Procedure 428.50 Courts generally grant leave when the delay hasn’t prejudiced the other side, but opposing counsel will argue prejudice hard if discovery has closed or trial is near.
Serving the Cross-Complaint
A cross-complaint against a party already appearing in the case must be served, with proof of service, at the time it is filed. When new parties are named, the cross-complaint must be served on all parties, and proof of service on the new parties must be filed within 30 days of the filing date.6California Courts. Rule 3.110 – Time for Service of Complaint, Cross-Complaint, and Response
New parties are served the way any new defendant would be: personal service or another method authorized by the Code of Civil Procedure, with a summons. Existing parties can be served through their attorneys of record. Bad service can lead the court to strike the pleading or refuse to enter default against a nonresponding cross-defendant.
Responding to a Cross-Complaint
Once served, you have 30 days to respond. The options mirror those for an original complaint: answer, demurrer, or motion to strike.7California Legislative Information. California Code of Civil Procedure 432.10 A demurrer challenges the legal sufficiency of the claims; a motion to strike targets specific allegations. Courts often sustain a demurrer with leave to amend, so a weak cross-complaint doesn’t necessarily vanish on the first pass.
Ignore the cross-complaint and you risk default. The cross-complainant can ask the court to enter your default and prove up damages without your participation.
The Statute of Limitations Pauses
When the plaintiff files, the statute of limitations is tolled for the defendant’s cross-complaints against that plaintiff. A California appellate court in Paredes v. Credit Consulting Services (2022) confirmed that the tolling applies whether the cross-complaint is compulsory or permissive.8FindLaw. Paredes v. Credit Consulting Services Inc. Even claims that have nothing to do with the original complaint benefit.
The logic: by suing you, the plaintiff has opened the door to your claims against them. As long as your claims weren’t already time-barred when the complaint was filed, the clock pauses. That takes some pressure off defendants who might otherwise feel rushed to file a cross-complaint just to preserve a limitations period.
Filing Fees
California’s statewide fee schedule usually charges no additional fee for a cross-complaint that keeps the case in its existing classification. An amended cross-complaint that doesn’t change the amount at issue or reclassify the case also carries no filing fee.9Judicial Council of California. Superior Court of California Statewide Civil Fee Schedule Fees apply in two situations:
- $145 for a cross-complaint in a limited civil case that raises the amount at issue from $10,000 or less to more than $10,000 but not exceeding $25,000.9Judicial Council of California. Superior Court of California Statewide Civil Fee Schedule
- $140 for a cross-complaint that reclassifies a case from limited civil to unlimited civil.9Judicial Council of California. Superior Court of California Statewide Civil Fee Schedule
Fees in Riverside, San Bernardino, and San Francisco counties may vary because of local courthouse construction surcharges.
Costs, Attorney Fees, and Sanctions
California’s cost-recovery statute treats a cross-complaint the same as a complaint for prevailing-party purposes. The statute defines “complaint” to include a cross-complaint, “plaintiff” to include a cross-complainant, and “defendant” to include a cross-defendant.10California Legislative Information. California Code of Civil Procedure 1032 The prevailing party recovers costs as a matter of right, which typically includes filing fees, deposition costs, and service of process expenses.
Attorney fees are separate. Under the American rule, each side pays its own lawyers unless a statute or contract says otherwise. In a contract dispute, if the contract has a fee-shifting clause, California law makes it reciprocal: whichever side prevails on the contract can recover reasonable attorney fees, regardless of which party the clause originally favored. The court looks at which party got the greater relief; on mixed results, the court can find that no party prevailed and deny fees entirely.11California Legislative Information. California Civil Code 1717 If the underlying case involves a contract with a fee clause, a cross-complaint carries stakes well beyond the claim itself.
A cross-complaint is also a pleading, which means it carries an implicit certification that the claims are legally warranted, factually grounded, and not filed for harassment, delay, or needless expense.12California Legislative Information. California Code of Civil Procedure 128.7 When it fails that standard, the court can sanction the attorney, the firm, or the party. Sanctions under CCP 128.7 aren’t automatic. The moving side must give written notice and allow a safe-harbor period for the filing to be withdrawn or corrected. Filing a cross-complaint purely to pressure settlement or retaliate is the kind of conduct the statute targets.
Deciding Whether to File
Before you draft your answer, catalog every potential claim you have against the plaintiff that touches the same facts. The compulsory rule turns oversight into permanent forfeiture, so this is a first-week task, not something to revisit later.
Cross-complaints against third parties can shift liability and change settlement math. If you’re a general contractor facing a defect claim and you cross-complain against the subcontractor actually at fault, the plaintiff has another pocket at the table, which often accelerates settlement. Bringing in new parties also increases complexity, extends discovery, and raises costs for everyone, so the decision is worth making deliberately rather than reflexively.
Consolidating related disputes in one proceeding avoids inconsistent judgments. Landlord sues for unpaid rent, tenant has habitability claims — resolving both in the same case produces a single coherent outcome. Litigating them separately risks two judges reaching contradictory findings.
Filing a cross-complaint changes the posture of your case. You’re no longer only defending; you’re also prosecuting. That dual role means managing two sets of discovery, two sets of pretrial motions, and possibly two sets of experts. The potential recovery should justify the added expense before you commit.