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Yes! You can use AI to fill out Form SUM-110, Summons—Cross-Complaint

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Form SUM-110, Summons—Cross-Complaint, page 1
Simple · 28/100Form Complexity Index

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What this form asks for

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California Form SUM-110 is a legal document that serves as a summons for a cross-complaint, officially notifying a party that they are being sued by a defendant in an existing case. It is critically important because it initiates the legal requirement for the cross-defendant to respond within 30 calendar days, and failure to do so can result in a default judgment. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
Fillable fields27
Pages1
Form Complexity IndexSimple, 28/100

The AI checks your answers before you download

14 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

Case Number Presence

This check ensures that the 'CASE NUMBER' field (FillText26[0]) is not empty. The case number is a unique identifier assigned by the court to a specific legal action. Without it, the document cannot be correctly filed or associated with the existing case, leading to processing delays or rejection by the court clerk.

Court Name and Address Completeness

Validates that the field for the court's name and address (FillText180[0]) is filled. This information is critical as it specifies the jurisdiction and physical location where the legal proceedings are taking place and where the response must be filed. An omission would make the summons legally deficient and confusing for the recipient.

Cross-Complainant Identification

Ensures the 'YOU ARE BEING SUED BY CROSS-COMPLAINANT' field (FillText25[0]) contains a name. It is a fundamental requirement of due process that the person being sued (the cross-defendant) knows the identity of the party bringing the action against them. Failure to provide this name would invalidate the summons.

Attorney or Pro Se Filer Information Completeness

This check verifies that the name, address, and telephone number of the cross-complainant's attorney or the cross-complainant themselves (if self-represented) is provided in field FillText30[0]. This contact information is essential for all parties to communicate and serve subsequent legal documents. Missing information would halt communication and violate rules of procedure.

Valid Filing Date

This validation confirms that the 'DATE' field (FillText34[0]) contains a valid date in a recognized format (e.g., MM/DD/YYYY) and is not a future date. The filing date is the official date the document is submitted to the court and is crucial for calculating legal deadlines. An invalid or future date would be rejected by the court clerk.

Manner of Service Selection

Verifies that at least one of the primary checkboxes in the 'NOTICE TO THE PERSON SERVED' section (items 1, 2, or 3) is selected. This section is legally required to inform the recipient of the capacity in which they are being served (e.g., as an individual, on behalf of a corporation). Without this selection, the service of the summons may be deemed improper.

And 8 more checks
  • Fictitious Name Specification
  • Entity Name Specification for 'On Behalf Of' Service
  • Entity Type Selection for 'On Behalf Of' Service
  • 'Other' Entity Type Specification
  • Personal Delivery Date Presence
  • Personal Delivery Date Validity
  • Short Case Name Presence
  • Attorney/Party Phone Number Format

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How to Fill Out SUM-110 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select the Form SUM-110, Summons—Cross-Complaint.
  2. Enter the name and address of the court where the case is filed.
  3. Provide the short name of the case and the official case number from the original complaint.
  4. Input the full name, address, and telephone number of the cross-complainant or their legal representative.
  5. In the 'Notice to the Person Served' section, check the appropriate boxes to specify who is being served and in what capacity (e.g., as an individual, on behalf of a corporation).
  6. Review all auto-filled and manually entered information for complete accuracy, ensuring all details match the legal case file.
  7. Download the completed form to be dated, signed, and sealed by the court clerk before it is formally served on the cross-defendant.

Common Mistakes in Completing SUM-110

The ones the AI is built to catch.

Incorrect or Incomplete Court Information
Filers often enter a partial court name, such as 'Los Angeles Superior Court,' without specifying the exact branch and address. This mistake occurs due to uncertainty about the specific courthouse handling the case. An incorrect court name or address can lead to the document being filed in the wrong venue, causing significant delays, rejection by the clerk, and the need to re-file and re-serve the documents. To avoid this, verify the exact court name and full street address from the original complaint or the court's official website.
Mismatched Case Number
Users frequently make typos, transpose numbers, or omit characters when entering the case number from the original complaint. This is a critical error because the case number is the primary identifier that links the cross-complaint to the existing lawsuit. An incorrect case number will cause the court clerk to reject the filing or misfile the document, disconnecting it from the main case and potentially invalidating the filing deadline. Always double-check the case number against the original complaint or other official court documents before submission.
Using an Incorrect Short Case Name
The 'SHORT NAME OF CASE' must be identical to the one used on the original complaint (e.g., 'Smith v. Jones'). Filers sometimes create a new variation or abbreviate it differently, causing confusion. This can lead to filing clerks being unable to match the cross-complaint to the correct case file, resulting in processing delays or rejection. To prevent this, copy the short case name exactly as it appears on the initial complaint.
Omitting Cross-Complainant's Name
The form requires the name of the cross-complainant in the section 'YOU ARE BEING SUED BY CROSS-COMPLAINANT.' Filers sometimes overlook this field, assuming the information in the attorney box is sufficient. Leaving this blank fails to properly and formally notify the cross-defendant who is suing them, which can be grounds for a legal challenge to the summons's validity. Ensure the full legal name of the party or parties filing the cross-complaint is clearly entered in this specific field.
Incomplete Attorney or Self-Represented Party Information
This section requires the name, address, and phone number of the filing party's representative or the party themselves if they have no attorney. Common mistakes include missing a phone number, using a P.O. Box when a physical address is required, or having illegible handwriting. Incomplete or incorrect contact information can prevent other parties and the court from communicating effectively, leading to missed notices and potential prejudice in the case. Carefully fill in all required contact details and ensure they are current and legible.
Incorrectly Identifying the Served Party
In the 'NOTICE TO THE PERSON SERVED' section, the server must check the correct box to indicate in what capacity the person is being served (e.g., as an individual, on behalf of a corporation). Servers often check the wrong box or fail to provide required specifics, such as the name of the corporation. This mistake can invalidate the service of process, forcing the cross-complainant to re-serve the documents and potentially miss legal deadlines. The person serving the summons must understand the legal status of the cross-defendant and accurately complete this section.
Failing to Specify Fictitious Name or Entity
When serving a person under a fictitious name (Box 2) or on behalf of an entity (Box 3), the form requires specifying the name (e.g., 'Doe 1') or the entity being represented. People often check the box but forget to write in the required name on the 'specify' line. This omission makes the service ambiguous and legally insufficient, as it doesn't clearly state who is being brought into the lawsuit. Always complete the 'specify' line next to the checked box with the appropriate information.
Selecting the Wrong Corporate Service Code (CCP)
When serving a business entity (Box 3), the form lists several California Code of Civil Procedure (CCP) sections (e.g., 416.10 for a corporation). Choosing the wrong code is a common error for non-lawyers who may not know the entity's exact legal status. This technical error can be used by the opposing side to challenge the validity of the service, potentially leading to the dismissal of the cross-complaint against that party. It is crucial to verify the legal status of the entity being served and select the corresponding CCP code.
Signing in the 'For Court Use Only' Section
Self-represented litigants sometimes mistakenly sign or write in the areas designated 'FOR COURT USE ONLY,' such as the box for the Clerk's signature and seal. This happens because they are trying to be thorough but don't understand the form's layout. Any markings in this area can cause the clerk to reject the form, requiring the filer to submit a clean, corrected version. Filers should only complete the sections clearly intended for the parties or their attorneys.
Illegible or Unprofessional Entries
Submitting a form with illegible handwriting, cross-outs, or information written outside the designated fields is a frequent problem. A messy or unreadable form can be rejected by the court clerk or lead to critical data entry errors in the court's system, such as misspelling a name. To ensure clarity, it is best to fill out the form electronically. If the form is a non-fillable PDF, AI-powered tools like Instafill.ai can convert it into a fillable version to facilitate clean, typed entries.

Frequently Asked Questions About SUM-110

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 5 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your SUM-110.
Can I fill other forms too?
This plan is for your SUM-110: your own AI agent fills it as often as 5 times a month. To fill other forms and upload your own, choose a Professional plan from your account.
How do I cancel?
From your account, in two clicks, any time. No email, no call.
How does the AI fill out SUM-110?
You answer a few questions in plain words, or upload a document you already have. The AI reads what you give it and puts each answer into the right field of SUM-110, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is SUM-110 to fill out?
SUM-110 has a Form Complexity Index of 28 out of 100, in the simple tier: 27 fillable fields across 1 page. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is the purpose of the Summons—Cross-Complaint (Form SUM-110)?
This form is a legal notice informing you that you are being sued by a party involved in an existing lawsuit. It officially brings you into the case as a 'cross-defendant'.
I just received this form. What is the first thing I should do?
You must file a formal written response with the court within 30 calendar days of being served. It is strongly recommended that you contact an attorney immediately to understand your rights and obligations.
What happens if I ignore this summons and don't respond within 30 days?
If you fail to file a response on time, you may lose the case by default. This could allow the court to take your wages, money, and property without further warning.
Who is the 'cross-complainant' mentioned on the form?
The cross-complainant is the person or entity who has filed a new claim against you within the ongoing lawsuit. You are the 'cross-defendant' who must respond to their claims.
Where can I find the case number and court information?
The name and address of the court, the short case name, and the case number are all located in the boxes at the top of the form. You will need this information to file your response.
I can't afford an attorney. What are my options?
The form lists resources for free or low-cost legal help, such as nonprofit legal services programs and attorney referral services. You can find more information on the California Courts' self-help website.
What if I cannot afford the filing fee to submit my response?
You can ask the court clerk for a 'fee waiver' form. If you meet the requirements, the court may allow you to file your response without paying the associated fees.
What does the 'NOTICE TO THE PERSON SERVED' section at the bottom mean?
This section specifies in what capacity you are being sued. For example, it indicates whether you are being served as an individual, on behalf of a corporation, or as a minor's guardian.
Who fills out this SUM-110 form?
The cross-complainant or their attorney fills in the case details, the court clerk signs and issues it, and the person who serves you the documents completes the 'Notice to the Person Served' section.
Can AI tools help me fill out the forms needed to respond to this summons?
Yes, services like Instafill.ai use AI to help you accurately auto-fill your response forms, which can save time and reduce errors. However, AI is not a substitute for legal advice from a qualified attorney.
How can I use Instafill.ai to prepare my response online?
You can upload the appropriate legal response form to Instafill.ai. The platform will make it an interactive, fillable document and assist you in entering your information before you print it for filing with the court.
The PDF of the response form I downloaded is not fillable. What should I do?
You can use a tool like Instafill.ai to convert the flat, non-fillable PDF into an interactive form. This allows you to easily type your answers directly into the fields on your computer.
What is the 'statutory lien for waived fees' mentioned in the notice?
If you get a fee waiver and later receive a settlement or award of $10,000 or more, the court has a legal claim to be repaid for those waived fees. This lien must be paid before the court will dismiss the case.
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