How to File a Cross-Complaint in California

A cross-complaint is a pleading filed by a defendant that asserts affirmative claims against others. Instead of only defending yourself, you go on offense. Under CCP 426.10, a cross-complaint can assert any cause of action against the plaintiff, co-defendants, or third parties not yet in the lawsuit.

Think of it this way: the plaintiff sued you, but you believe they owe you money, or that a third party is actually responsible for the harm. A cross-complaint brings those claims into the same case.

Compulsory vs. Permissive at a Glance

Under CCP 426.30, if you have a cause of action against the plaintiff that arises out of the same transaction, occurrence, or series of transactions or occurrences as the plaintiff's claims, you must assert it as a cross-complaint. If you fail to do so, you are permanently barred from bringing that claim in a separate lawsuit.

The "Related Cause of Action" Test

CCP 426.10(c) defines "related cause of action" as a cause of action that arises out of the same transaction, occurrence, or series of transactions or occurrences as the cause of action which the plaintiff alleges in the complaint. Courts interpret this broadly:

• Same contract -- If the plaintiff sues for breach of a contract and you have your own breach of contract claim under the same agreement, it is compulsory
• Same incident -- If the plaintiff sues for injuries from a car accident and you were also injured, your personal injury claim is compulsory
• Same business relationship -- Courts look at whether the claims share a "logical relationship" with the plaintiff's allegations

Exceptions to the Compulsory Rule

CCP 426.30(b) provides limited exceptions. A compulsory cross-complaint is not required when:

• The defendant is filing the cross-complaint at the time the Answer is due and it requires the court's permission (see CCP 426.50 for late filing)
• The cause of action requires the presence of additional parties over whom the court cannot acquire jurisdiction
• The plaintiff filed the action in an improper court that lacks jurisdiction over the cross-complaint

Under CCP 428.10, a defendant may file a cross-complaint against any person, whether already a party to the action or not, if the claims arise out of the same transaction or occurrence or assert a claim in the nature of indemnity or contribution. This is far broader than a compulsory cross-complaint.

Common Permissive Cross-Complaint Scenarios

The timing of your cross-complaint depends on who it is against and when in the case you are filing it:

A cross-complaint is formatted like a complaint but filed by the defendant. It must contain these key components:

1. Caption and Designation

Use the same case caption as the original lawsuit. Title it "CROSS-COMPLAINT" (or "CROSS-COMPLAINT OF [Your Name] AGAINST [Cross-Defendants]"). Include the case number and identify yourself as "Cross-Complainant" and the opposing parties as "Cross-Defendants."

2. Parties and Jurisdictional Allegations

Identify each cross-defendant by name and capacity. If bringing in new parties, include allegations establishing the court's jurisdiction over them (e.g., they reside in the county, the contract was performed in the county).

3. Causes of Action

State each cause of action as a separate count, just as in a complaint. For each, allege the facts supporting every required element. Common cross-complaint causes of action include:

• Breach of Contract -- When the plaintiff or a third party breached a contract with you
• Equitable Indemnity -- Seeking to shift liability to the party truly at fault
• Contribution -- Seeking proportional sharing of liability among joint tortfeasors
• Declaratory Relief -- Asking the court to determine rights and obligations under a contract or statute
• Negligence -- When a third party's negligence caused the harm the plaintiff attributes to you

4. Prayer for Relief

State what you want the court to award: compensatory damages, indemnity, contribution, declaratory relief, attorney fees (if authorized by contract or statute), and costs of suit.

Sample Cross-Complaint Structure

CAPTION
[Same as original case]
CROSS-COMPLAINT OF [DEFENDANT NAME]

PARTIES
1. Cross-Complainant [Your Name] is the defendant
   in the above-captioned action.
2. Cross-Defendant [Plaintiff Name] is the plaintiff
   in the above-captioned action.
3. Cross-Defendant [Third Party Name] is a
   [corporation/individual] who ...

GENERAL ALLEGATIONS
4. On or about [date], [factual background
   common to all causes of action].
5. [Additional common facts ...]

FIRST CAUSE OF ACTION
(Breach of Contract -- Against Cross-Defendant [Name])
6. Cross-Complainant re-alleges paragraphs 1-5.
7. [Element: existence of contract]
8. [Element: plaintiff's performance or excuse]
9. [Element: defendant's breach]
10. [Element: resulting damages]

SECOND CAUSE OF ACTION
(Equitable Indemnity -- Against Cross-Defendant [Name])
11. Cross-Complainant re-alleges paragraphs 1-5.
12. [Allegations of indemnity ...]

PRAYER FOR RELIEF
WHEREFORE, Cross-Complainant prays for judgment:
1. Compensatory damages according to proof;
2. Complete indemnity or contribution;
3. Attorney fees per [contract/statute];
4. Costs of suit;
5. Such other relief as the Court deems just.