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Yes! You can use AI to fill out Form SUM-100, Summons (Citacion Judicial)

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Form SUM-100, Summons (Citacion Judicial), page 1
Basic · 36/100Form Complexity Index

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What this form asks for

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Form SUM-100, also known as a Summons, is a legal document from the Judicial Council of California used to formally notify a person or entity that a civil lawsuit has been filed against them. It outlines the defendant's obligation to respond within 30 days to avoid 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
Sections10
Questions that depend on earlier answers4
Form Complexity IndexBasic, 36/100

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.

Ensures Plaintiff Name is Provided

This check verifies that the field for the plaintiff's name ('YOU ARE BEING SUED BY PLAINTIFF') is not empty. The identity of the party initiating the lawsuit is a fundamental component of a legal summons. A missing plaintiff name renders the document legally deficient and invalid, as the defendant would not know who is suing them.

Ensures Defendant Name is Provided

This validation confirms that the defendant's name ('NOTICE TO DEFENDANT') has been entered. The summons must clearly and unambiguously identify the person or entity being sued for the service to be valid. Failure to name the defendant makes the summons unenforceable and subject to immediate challenge.

Validates Presence of Court Name and Address

This check ensures that the name and address of the court have been filled in. This information is critical as it directs the defendant to the specific judicial venue where they must file their response. An omission would make it impossible for the defendant to respond correctly, rendering the summons defective.

Verifies Case Number is Present

This validation checks that the 'CASE NUMBER' field is not empty. The case number is the unique identifier for the lawsuit within the court system, used to track all filings and proceedings. A summons without a case number cannot be properly filed or associated with the correct legal action.

Ensures Plaintiff's Representative Information is Complete

This check validates that the name, address, and telephone number of the plaintiff's attorney (or the plaintiff, if self-represented) are provided. This is a legal requirement so the defendant or their counsel knows who to contact and where to send legal documents. Incomplete information can halt the legal process and may violate rules of civil procedure.

Validates Issuance Date Format and Plausibility

This check ensures the 'DATE' field, representing when the summons was issued by the clerk, contains a valid date in a recognized format (e.g., MM/DD/YYYY). It should also verify the date is not in the future or unreasonably far in the past. This date is crucial for establishing the official start of the legal action.

And 8 more checks
  • Requires Fictitious Name if 'Sued Under' is Checked
  • Requires Entity Name if 'On Behalf Of' is Checked
  • Requires Entity Type Selection for 'On Behalf Of' Service
  • Requires Specification if 'Other' Entity Type is Checked
  • Ensures Only One Primary Service Capacity is Selected
  • Requires Delivery Date if 'Personal Delivery' is Checked
  • Validates Personal Delivery Date Format and Plausibility
  • Ensures Delivery Date is On or After Issuance Date

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How to Fill Out SUM-100 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload your SUM-100 form or select it from our library of official court documents.
  2. Allow the AI to process the document, making all fields interactive and ready for your input.
  3. Enter the name of the plaintiff in the 'YOU ARE BEING SUED BY PLAINTIFF' section.
  4. Input the full name and address of the court where the lawsuit is filed, along with the assigned Case Number.
  5. Provide the contact information, including name, address, and phone number, for the plaintiff's attorney or the plaintiff if they are self-represented.
  6. Review all the entered information for accuracy, using the AI's guidance to ensure all required fields are completed correctly.
  7. Download the completed, ready-to-file Summons. The document can then be officially filed with the court and served to the defendant as required by law.

Common Mistakes in Completing SUM-100

The ones the AI is built to catch.

Incorrect or Incomplete Court Information
Plaintiffs often enter a generic court name or an incomplete address in 'The name and address of the court is' field. This happens when they are unsure of the specific courthouse branch handling the case. An incorrect address can confuse the defendant and may cause the court clerk to reject the summons, delaying the legal process.
Missing or Incorrect Case Number
After a case is filed, the court clerk assigns a case number, which must be added to the summons before it is served. Plaintiffs frequently forget to transcribe this number onto the service copies or make typographical errors. Without the correct case number, the defendant cannot file a response correctly, and the court cannot link documents to the case, potentially leading to a default judgment.
Inaccurate Plaintiff or Defendant Names
Spelling errors or using informal names (e.g., 'John Smith' instead of 'John A. Smith Jr.') for the plaintiff or defendant is a frequent mistake. For businesses, this could mean using a brand name instead of the full legal entity name. This error can create a legal loophole for the defendant to claim they are not the party being sued, forcing the plaintiff to amend and re-serve the documents, which costs time and money.
Omitting Plaintiff's Attorney/Pro Se Contact Details
The section for the plaintiff's attorney's name, address, and phone number is sometimes left blank or filled with outdated information. This prevents the defendant from being able to serve their response or communicate with the plaintiff's side. This lack of communication can lead to procedural delays and complications for both parties.
Improper 'Notice to the Person Served' Selection
The server of the summons must check a box indicating the capacity in which the defendant was served (e.g., as an individual, on behalf of a corporation). Choosing the wrong option, such as checking 'as an individual defendant' when serving an agent of a corporation, can invalidate the service. An invalid service means the clock for the defendant's response never started, and the plaintiff must serve the documents all over again.
Incomplete 'On Behalf Of' Specification
When serving someone on behalf of an entity (box #3), the server must specify the entity's name and check the box corresponding to the legal authority (e.g., CCP 416.10 for a corporation). It is common to forget to write the entity's full name or select the correct code. This ambiguity can be used by the defendant entity to challenge the service as improper, potentially leading to a dismissal.
Forgetting the Date of Personal Delivery
The person serving the summons must write the date of service in section #4, 'by personal delivery on (date)'. This date is crucial as it starts the 30-day countdown for the defendant to file a response. Forgetting to fill in this date creates ambiguity about the response deadline and can weaken the proof of service if challenged in court.
Serving an Unissued Summons
A summons is only valid after it has been filed with the court and issued by the clerk, indicated by a court seal, date, and case number. Plaintiffs sometimes mistakenly serve a draft copy that has not been officially issued by the court. Service of an unissued summons is legally void and has no effect, requiring the plaintiff to restart the entire service process correctly.
Illegible Handwriting on Paper Forms
Many legal forms are still filled out by hand, and illegible handwriting is a common problem. If the court clerk, defendant, or attorneys cannot clearly read the names, addresses, or case number, it can lead to misfilings, returned mail, or an inability for the defendant to respond. This can cause critical delays or even have a filing rejected. Using a fillable PDF or a tool like Instafill.ai, which can make non-fillable PDFs fillable, ensures all information is clear and legible.
Misunderstanding the 30-Day Response Deadline
A defendant receiving this form may not read the instructions carefully and misunderstand the deadline. They might assume it is 30 'business' days instead of 'calendar' days, or believe a phone call to the plaintiff's attorney is a sufficient response. The form clearly states a written response is required, and failing to file one on time can result in losing the case by default, allowing the court to seize wages and property.

Frequently Asked Questions About SUM-100

 

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-100.
Can I fill other forms too?
This plan is for your SUM-100: 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-100?
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-100, 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-100 to fill out?
SUM-100 has a Form Complexity Index of 36 out of 100, in the basic 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 SUM-100 Summons form?
This is an official California court form used to formally notify a person or entity (the defendant) that a lawsuit has been filed against them by a plaintiff. It is the official start of the notification process for a civil lawsuit.
I received this form. What does it mean?
Receiving this form means you are being sued. You must file a formal written response with the court within 30 days to avoid losing the case automatically.
How long do I have to respond to the Summons?
You have 30 calendar days after the summons and legal papers are served on you to file a written response at the court and serve a copy on the plaintiff.
What happens if I ignore this Summons and don't respond?
If you do not file a response on time, you may lose the case by default judgment. This could allow the court to take your wages, money, and property without any further warning.
Can I just call the court or the plaintiff to respond?
No, the form clearly states that a letter or a phone call will not protect you. You must file a proper legal written response with the court.
Who is supposed to fill out this form?
The plaintiff (the person suing) or their attorney fills out the case information, such as the names of the parties and the court address. The person who serves the documents completes the 'Notice to the Person Served' section.
I can't afford an attorney. What are my options?
The form suggests you may be eligible for free legal services from a nonprofit program. You can find these resources on the California Legal Services website or the California Courts Self-Help Center.
What should I do if I cannot afford the court's filing fee for my response?
You can ask the court clerk for a fee waiver form. If you qualify based on your income, the court may waive the filing fees.
What is the 'NOTICE TO THE PERSON SERVED' section for?
This section is filled out by the person delivering the summons to specify who received the documents and in what capacity, such as an individual defendant or on behalf of a corporation.
What is the POS-010 form mentioned at the bottom?
The POS-010, or Proof of Service of Summons, is a separate form used to prove to the court that the defendant was legally served with the lawsuit papers.
Can AI tools help me prepare this Summons form?
Yes, services like Instafill.ai use AI to help plaintiffs or their attorneys accurately auto-fill form fields like court and party information, saving time and helping to prevent errors.
How can I fill out the SUM-100 form online?
You can use a service like Instafill.ai to fill out the form. Simply upload the document, and the platform will make the fields interactive for you to complete and save your progress.
What can I do if the PDF of the Summons I downloaded is not fillable?
If you have a non-fillable or 'flat' PDF, you can upload it to a platform like Instafill.ai. It can convert the document into an interactive, fillable form that you can complete on your computer.
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