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Yes! You can use AI to fill out Form UD-101, Plaintiff's Mandatory Cover Sheet and Supplemental Allegations—Unlawful Detainer

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Form UD-101, Plaintiff's Mandatory Cover Sheet and Supplemental Allegations—Unlawful Detainer, page 1
Moderate · 48/100Form Complexity Index

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What this form asks for

The AI fills all of it, from your answers or your documents.

Form UD-101 is a required judicial council form in California that must be filed along with a complaint in an unlawful detainer (eviction) action. It serves as a cover sheet that summarizes key information for the court, such as whether the property is residential or commercial and provides critical details about rental assistance if the case involves non-payment of rent. 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 fields50
Pages2
Sections18
Questions that depend on earlier answers16
Form Complexity IndexModerate, 48/100

The AI checks your answers before you download

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

Case Number Format and Presence

This check ensures the 'Case Number' field is not empty and conforms to the specific format required by the court system. It prevents submission of forms with missing or improperly formatted case identifiers, which are essential for correct filing and retrieval. A failed validation would prompt the user to enter a valid case number before proceeding.

Attorney vs. Self-Represented Logic

Validates the relationship between the 'State Bar Number', 'Firm Name', and 'Attorney For' fields. If a 'State Bar Number' is provided, the 'Attorney For' field must be completed. If no 'State Bar Number' is entered, it implies the party is self-represented, and the 'Attorney For' field should be disabled or empty. This ensures clarity on legal representation.

Party Name Consistency Across Form

This validation cross-references all instances of 'Plaintiff Name' and 'Defendant Name' throughout the document, including the case caption, allegations, and verification sections. It ensures the names are spelled identically in every location to maintain legal consistency and prevent ambiguity. A mismatch would trigger an alert to correct the discrepancy.

Mutually Exclusive Property Type Selection

Ensures that the user selects either 'Residential' or 'Commercial' but not both. These options are mutually exclusive and dictate which subsequent sections of the form are applicable. This check prevents contradictory information and ensures the correct legal path is followed based on the property type.

Conditional Rent Default Declaration

If the 'Residential' property type is selected, this check verifies that one, and only one, of the options ('Yes' or 'No') for 'based on default in payment of rent/charges' is chosen. This is a mandatory declaration for residential unlawful detainer cases. The form cannot be submitted for a residential case without this information.

Conditional Rental Assistance Section Completion

This check enforces the dependency of the rental assistance questions on the 'Statements regarding rental assistance' checkbox. If this primary box is checked, the system must then verify that each sub-question (3a, 3b, 3c, 3d) has a 'Yes' or 'No' response. This ensures that if the section is declared applicable, it is completed in its entirety.

And 6 more checks
  • Mutually Exclusive Yes/No Responses
  • Attachment Count Logic
  • Verification Date Validity
  • Verification Name and Party Consistency
  • Address Block Completeness
  • Contact Information Formatting

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How to Fill Out UD-101 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select Form UD-101.
  2. Use the AI assistant to fill in the attorney/party information, court details, and case caption with plaintiff and defendant names.
  3. Specify whether the unlawful detainer action concerns a residential or commercial property.
  4. If the case is residential, answer the required questions about whether the action is based on non-payment of rent.
  5. Complete the detailed section regarding any rental assistance that has been applied for, received, or is pending.
  6. Indicate if there are other allegations and attach Form MC-025 if necessary.
  7. Review all the information for accuracy, then provide the date and printed name for verification before downloading the completed form for filing with the court.

Common Mistakes in Completing UD-101

The ones the AI is built to catch.

Entering Incorrect Court Branch Information
Filers often enter the address for the main county courthouse instead of the specific branch where the case is filed. This happens due to confusion or not verifying the correct location for unlawful detainer cases, and an incorrect court address can lead to the document being rejected or misrouted, causing significant delays. Always verify the exact street address, mailing address, and branch name for the specific court handling your case before filling out the form. AI-powered tools like Instafill.ai can help prevent this by using validated databases to populate correct court information automatically.
Inconsistent Plaintiff or Defendant Names
This form requires plaintiff and defendant names in multiple sections, but a common mistake is to have slight variations in spelling or the use of abbreviations between these sections. This inconsistency can create ambiguity and may lead to the court clerk rejecting the filing for correction. To avoid this, carefully enter the full legal name identically in every field where it is requested. Using a tool like Instafill.ai can ensure consistency by auto-populating recurring information like party names across the entire document from a single entry.
Incorrectly Filling Attorney Information as a Self-Represented Party
Parties representing themselves often get confused by fields intended for attorneys, like 'State Bar Number' and 'Firm Name,' and may incorrectly write 'N/A' or leave the entire contact section blank. This can result in the court being unable to contact them. If you are self-represented, you must leave attorney-specific fields blank but completely fill out your own name, address, and contact details. Smart form-filling tools like Instafill.ai can guide users by highlighting required fields based on their role.
Ignoring Conditional Logic for Checkboxes
The form contains several checkboxes with specific instructions, such as the rental assistance questions which should only be answered if the property is 'Residential.' People often miss this conditional logic, either answering questions that don't apply or failing to answer required ones, which can invalidate the form. Pay close attention to instructions like 'Fill only if...' to ensure you are completing the form correctly. Advanced tools like Instafill.ai can enforce this logic, automatically showing or hiding relevant sections based on your previous answers.
Omitting or Incorrectly Formatting the Case Number
The case number is the primary identifier for a court filing, but it's often left blank on initial filings or entered with incorrect formatting. Since the form asks for it in multiple places, it's also easy to create inconsistencies, which will cause the document to be rejected by the court clerk. Always double-check the court-assigned number for accuracy and consistency across the entire document. Form-filling software like Instafill.ai can help by validating the format and ensuring it is replicated perfectly in all required fields.
Failing to List All Plaintiffs or Defendants
In cases with multiple landlords or tenants, filers sometimes only list one name in the 'Plaintiff Name(s)' or 'Defendant Name(s)' fields. This is a critical error, as a judgment may only apply to the parties explicitly named in the complaint, creating legal hurdles later. Ensure every single plaintiff and defendant is listed by their full legal name. If the form is a non-fillable PDF, a tool like Instafill.ai can convert it to make it easier to list all parties without space constraints.
Contradictory Answers in the Rental Assistance Section
The rental assistance section (Item 3) requires a series of 'Yes/No' answers. A frequent error is checking both 'Yes' and 'No' for the same question or providing answers that logically contradict each other, which can lead a judge to question the filing's validity. Read each question carefully and select only one answer ('Yes' or 'No') for each sub-part. AI-powered form fillers like Instafill.ai can help prevent this by enforcing rules that only allow one selection per question.
Mishandling Attachments and Page Counts
When additional information is required on an attachment, people often forget to check the corresponding box on the main form or fail to enter the correct number of attached pages. This can lead to the court not considering the attached information because it wasn't properly referenced. Always check the 'Other allegations' or 'Number of pages attached' box and accurately count and specify the total number of pages you are including. Tools like Instafill.ai can help manage attachments and automatically update page count fields.
Incomplete or Missing Verification Section
The verification section is a legally required sworn statement, but filers frequently forget to enter the date, print their name, or sign the document. An unverified or improperly verified complaint is invalid and will be rejected by the court, causing delays and requiring refiling. Always complete the verification section in its entirety. Tools like Instafill.ai can ensure all other fields in the section are filled out and can flag them as mandatory to prevent submission with missing information.
Using Nicknames Instead of Full Legal Names
In all fields asking for a name, it is crucial to use the full legal name as it appears on official documents. People sometimes use nicknames or abbreviations out of habit, which can create a legal loophole or cause issues with enforcing a judgment. Always use complete and accurate legal names for all parties. To ensure accuracy, especially if the original form is a non-fillable PDF, you can use Instafill.ai to convert it into a fillable version, making it easier to type and review information.

Frequently Asked Questions About UD-101

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 13 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your UD-101.
Can I fill other forms too?
This plan is for your UD-101: 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 UD-101?
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 UD-101, 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 UD-101 to fill out?
UD-101 has a Form Complexity Index of 48 out of 100, in the moderate tier: 50 fillable fields across 2 pages. 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 this Unlawful Detainer Cover Sheet form?
This form is a required cover sheet for filing an unlawful detainer (eviction) lawsuit in California. It provides the court with essential summary information about the case, such as whether it involves a residential or commercial property and if it's related to non-payment of rent.
Who needs to fill out and file this form?
The plaintiff (the landlord or property owner) or their attorney must complete and file this form along with the main complaint when starting an eviction lawsuit.
What's the difference between the Plaintiff and the Defendant?
The Plaintiff is the person or entity filing the lawsuit, typically the landlord or property manager. The Defendant is the person being sued, which is usually the tenant or occupant of the property.
Where do I find the Case Number?
The court clerk will assign a Case Number when you file your lawsuit. If you are filing this cover sheet with your initial complaint, you can leave this field blank for the clerk to fill in.
Do I have to fill out the 'Statements regarding rental assistance' section?
Yes, if your case involves a residential property, you must complete this section. You need to disclose whether you have received or applied for any rental assistance for the amount demanded in your notice.
What is the difference between a 'Residential' and 'Commercial' unlawful detainer?
Select 'Residential' if the eviction is for a home, apartment, or other living space. Select 'Commercial' if the property is used for business purposes, as different rules and form sections apply.
What should I do if I have additional claims to make against the defendant?
You can check the 'Other allegations' box and either write them in the space provided or attach a separate MC-025 form. This is for claims that are not covered by the standard complaint form.
What information do I need for the 'Court Information' section?
You will need the name of the county, the full street and mailing address of the specific courthouse, and the court's branch name where you are filing the case. This information is available on the local Superior Court's website.
What does the 'Verification' section require?
The Verification section is where you legally swear that all the information provided in the document is true and correct to the best of your knowledge. You must date it and provide your printed name.
Can I use an AI tool to help me fill out this form?
Yes, services like Instafill.ai use AI to help you accurately auto-fill form fields, which can save time and help prevent common errors. This is especially useful for repetitive information like names and addresses.
My PDF version of this form is not fillable. What can I do?
If you have a flat, non-fillable PDF, you can use a service like Instafill.ai. It can convert the document into an interactive, fillable form that you can easily complete and print online.
How do I fill out this form online using Instafill.ai?
Simply upload the form to the Instafill.ai platform. The AI will identify the fields, and you can then type your information directly into the interactive form before downloading or printing the completed document.
What should I do after printing the form?
For your security, the form recommends pressing the 'Clear This Form' button after you have finished printing. This removes all your personal information from the digital copy to protect your privacy.
Do I need an attorney to fill out this form?
You are not required to have an attorney and can fill out the form yourself as a 'self-represented party'. If you choose to represent yourself, you will enter your own name and contact information in the 'Attorney or Party' section.
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