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SUM-110Mandatory

Summons—Cross-Complaint

California · Judicial Council of California · Effective July 1, 2009

This form is a Summons—Cross-Complaint that tells a person who was already sued that they are also being sued by another party in the same case. It warns the person that they must file a written response within 30 calendar days or they could lose the case.

The court describes it as: Tells a party who started a court case or another party that a person who was sued in the case is also suing them and what can happen if a response is not filed in 30 days.

Open the official PDFfrom Judicial Council of California

Where this fits in a case

Start a case

Stage: Start a case

This form is used when a party who was originally sued in a court case decides to sue another person who is also involved in the original case.

Either party may file.

Official instructions

How-to guides published by the court for this form.

Common questions

What does this form tell me?
It tells you that you are being sued by a cross-complainant, which means someone else in the case is suing you too. It also gives you a deadline to respond in writing.
What happens if I don't file a response?
If you do not file your response on time, you may lose the case by default, and the court could take your wages, money, or property.
Do I need a lawyer?
The form suggests that calling an attorney right away is recommended, and it provides information on finding legal help if you cannot afford one.

Revision history

No changes recorded since we started tracking this form on October 9, 2026. The current version took effect July 1, 2009.

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