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Yes! You can use AI to fill out Form UD-105, Answer—Unlawful Detainer

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Form UD-105, Answer—Unlawful Detainer, page 1
Moderate · 53/100Form 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-105, Answer—Unlawful Detainer, is a crucial legal form used in California Superior Courts by a tenant (defendant) to formally respond to an eviction complaint filed by a landlord (plaintiff). It allows the tenant to either generally or specifically deny the landlord's claims and to assert various legal defenses, such as breach of warranty of habitability, retaliation, or improper notice. Filing this answer is a critical step for a tenant to avoid a default judgment and present their side of the case. 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 fields105
Pages4
Sections18
Questions that depend on earlier answers16
Form Complexity IndexModerate, 53/100

The AI checks your answers before you download

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

Case Number Consistency Across Form

This check verifies that all fields designated for the 'Case Number' contain the exact same value throughout the entire document. Mismatched case numbers can lead to filing errors, document rejection by the court, or incorrect association with the legal case. If validation fails, the user must correct the case numbers to ensure they are identical.

Mutually Exclusive Denial Selection

Validates that only one of the two main denial options, 'General Denial' or 'Specific Denials', is selected, as instructed by the form. Selecting both is a logical contradiction and can invalidate the defendant's answer, potentially leading to a default judgment. A failure requires the user to choose only one of the two options.

Conditional Requirement for Specific Denials

Ensures that if the 'Specific Denials' box is checked, the filer provides the required details. The user must either fill in the 'Denied Paragraph Numbers or Explanation' text area or check the box indicating that an attachment (MC-025) is being used for this purpose. Failure to provide this information makes the specific denial incomplete and legally insufficient.

Party Name Consistency

This validation confirms that the names entered in the 'Plaintiff Name(s)' and 'Defendant Name(s)' fields are consistent with the 'PLAINTIFF' and 'DEFENDANT' fields in the document's header/footer sections. Inconsistent party names can cause confusion and processing delays with the court clerk. A validation failure would prompt the user to standardize the names across all fields.

State Bar Number Format

Verifies that the 'State Bar Number' field contains a valid numerical format, as this is a unique identifier for a licensed attorney. Submitting an incorrectly formatted or non-numeric bar number can prevent the court from verifying the attorney's status and authority to represent the client. The check ensures the entry is numeric and may check for a specific length.

Attorney Representation Logic

Checks that if a 'State Bar Number' is provided, the 'Attorney For (Client Name)' field is also filled out. This is a logical check to ensure that if an attorney is filing the form, they have clearly identified which party they are representing. An omission could lead to ambiguity about who is being represented in the legal action.

And 9 more checks
  • Conditional Date for Rent Offer Defense
  • Conditional Requirement for Local Ordinance Defense
  • Tenant Protection Act Defense Logic
  • Attachment Page Count Verification
  • ZIP Code Format Validation
  • Email Address Format Validation
  • Signature Date Requirement
  • Defendant Name for Answer Consistency
  • Conditional Requirement for Rental Assistance Defense

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How to Fill Out UD-105 Online for Free in 2026

What the AI walks you through.

  1. Navigate to Instafill.ai and upload or select Form UD-105, Answer—Unlawful Detainer.
  2. Use the AI assistant to accurately enter the court, case number, plaintiff, and defendant information from the complaint you received.
  3. In the 'DENIALS' section, choose whether to generally deny the complaint (for claims under $1,000) or specifically deny certain allegations.
  4. Go through the 'AFFIRMATIVE DEFENSES' section and check the boxes for all legal reasons that apply to your situation, such as issues with habitability, improper notice, or retaliation.
  5. Provide specific facts and details for the defenses you selected, using the designated spaces or attaching a separate form (MC-025) if necessary.
  6. Complete the 'OTHER STATEMENTS' and 'REQUESTS' sections if you have additional claims, such as an excessive fair rental value or a request for attorney's fees.
  7. Carefully review the entire completed form for accuracy, then date, sign, and download the document to be filed with the court and served on the plaintiff.

Common Mistakes in Completing UD-105

The ones the AI is built to catch.

Incorrect or Incomplete Case Number
Users often mistype the case number or omit parts of it, such as letters or leading zeros. The case number must be entered exactly as it appears on the Complaint or Summons to ensure the document is filed correctly in the court's system. An incorrect number can lead to the rejection of the filing, significant delays, or the answer not being associated with the correct case, potentially resulting in a default judgment.
Mismatching Plaintiff or Defendant Names
Filers frequently use nicknames, abbreviations, or misspell the names of the plaintiff(s) or defendant(s). It is critical that the names listed on the answer match the full legal names on the original complaint exactly. Any discrepancy can create legal ambiguity, cause confusion in court records, and may even provide grounds for the opposing party to challenge the validity of the response.
Improper Selection of General or Specific Denial
This form requires the defendant to choose between a 'General Denial' and a 'Specific Denial,' but not both. A common error is checking 'General Denial' when the complaint demands more than $1,000, which is not permitted and invalidates the denial. This mistake can have severe legal consequences, as it may result in the court deeming all allegations in the complaint to be admitted by the defendant.
Checking a Defense Box Without Providing Factual Support
Many defendants check boxes for various affirmative defenses (e.g., 'breached warranty to provide habitable premises' or 'retaliatory eviction') but fail to provide the required factual explanation in the designated space or on an attached MC-025 form. Simply checking a box is legally insufficient; you must state the specific facts that support the defense. Without this explanation, the court will likely disregard the defense entirely, weakening your case.
Incomplete Attorney or Party Contact Information
Leaving the contact information section partially blank is a frequent oversight. Fields like the State Bar number (for attorneys), email address, and telephone number are essential for the court and opposing counsel to provide notices and other communications. Missing information can lead to missed hearings, crucial updates, or filing deadlines, which could jeopardize the outcome of the case.
Ignoring Conditional Field Requirements
The form contains many fields that are conditional, meaning they should only be filled out if a corresponding checkbox is marked (e.g., providing a date only if the 'Offered rent before notice expired' box is checked). People often fill in these dependent fields without checking the primary box, or vice versa, creating a confusing and contradictory answer. This can undermine the credibility of the response and cause the court to ignore the information.
Failing to Specify 'Other' Defenses or Requests
When a user checks a box for 'Other' defenses or requests, they often forget to provide the mandatory explanation in the space provided or on an attachment. An 'Other' selection is meaningless without a clear, written specification of the claim or request. The court cannot guess the filer's intent, so failing to provide this detail means the defense or request will be completely overlooked.
Indicating an Attachment but Failing to Include It
The form frequently instructs users to use form MC-025 for additional space and to note the number of pages attached. A critical error is writing 'see attachment' or checking a box indicating an attachment is used, but then failing to physically or electronically include the MC-025 form with the filing. If the attachment is missing, any facts, defenses, or explanations it was supposed to contain will not be considered by the court.
Incorrect Court Branch and Address Information
Filers sometimes enter a generic county court address instead of the specific street address and branch name where the case is being heard, as listed on the summons. Filing documents at the wrong courthouse location can cause them to be rejected or significantly delayed in reaching the correct department. It is crucial to copy the exact court address and branch name from the official court papers to ensure timely and proper filing.

Frequently Asked Questions About UD-105

 

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This plan is for your UD-105: 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.
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How does the AI fill out UD-105?
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-105, 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-105 to fill out?
UD-105 has a Form Complexity Index of 53 out of 100, in the moderate tier: 105 fillable fields across 4 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 'ANSWER—UNLAWFUL DETAINER' form used for?
This form is used by a defendant (tenant) to respond to an unlawful detainer (eviction) lawsuit filed by a plaintiff (landlord). It allows you to deny the landlord's claims and state your legal defenses for why you should not be evicted.
Who needs to fill out this form?
Any tenant who has been served with a Summons and Complaint for Unlawful Detainer and wishes to contest the eviction must fill out and file this form with the court. If you do not file an answer, the landlord may win the case by default.
What information do I need before I start filling out this form?
You will need a copy of the Complaint for Unlawful Detainer to get the exact plaintiff and defendant names, the court case number, and the specific allegations you need to respond to. Gather any documents that support your defenses, such as rent receipts or repair requests.
What is the difference between a 'General Denial' and a 'Specific Denial'?
A 'General Denial' denies every statement in the complaint, but you can only use it if the complaint does not demand more than $1,000. If the complaint demands more than $1,000, you must use a 'Specific Denial' to address each specific allegation.
How do I use the 'Affirmative Defenses' section?
This section allows you to explain the legal reasons why the landlord should not win the eviction case. You should check the box for each defense that applies to your situation, such as the landlord breaching the warranty of habitability or retaliating against you.
What if I need more space to explain my denials or defenses?
If you run out of space, you can use an Attachment form (MC-025). Be sure to check the box on the main form indicating that an attachment is included and label the attachment clearly (e.g., 'Attachment 3t').
What is the 'breach of warranty to provide habitable premises' defense?
This defense claims that the landlord failed to maintain the rental unit in a livable condition, with issues like a lack of heat, broken plumbing, or pest infestations. If you check this box, you are arguing that you should not have to pay full rent because of these serious problems.
What does it mean if the demand is subject to the 'Tenant Protection Act of 2019'?
This refers to a state law that provides tenants with certain protections, including requiring 'just cause' for most evictions. If your tenancy is covered, you can check the relevant boxes if the landlord failed to comply with the Act's requirements.
After I fill out the form, what do I do with it?
You must file the completed form with the Superior Court listed on the complaint and serve a copy on the plaintiff or their attorney. Be aware of strict deadlines, as you typically only have a few days to respond after being served with the lawsuit.
Where do I find the 'Case Number'?
The case number is assigned by the court and will be printed on the top of the Summons and Complaint documents you received from the plaintiff. It is crucial to enter this number correctly on all pages of your answer form.
Do I need to fill out the attorney information section if I don't have a lawyer?
Yes, if you are representing yourself, you must fill this section out with your own name, address, and contact information. Where it asks for 'Attorney For,' you can write your own name or 'Defendant, In Pro Per.'
Can an AI tool help me fill out this form?
Yes, services like Instafill.ai use AI to accurately auto-fill form fields from your saved information, which can save you significant time and help prevent errors. While AI can assist with filling the form, it cannot provide legal advice.
How can I use Instafill.ai to fill out this form online?
Simply upload the 'ANSWER—UNLAWFUL DETAINER' form to the Instafill.ai platform. The AI will identify the fields, allowing you to type your information directly into the interactive form, save your progress, and download the completed document.
The PDF version of the form I have isn't fillable. What can I do?
You can use a service like Instafill.ai, which can convert flat, non-fillable PDFs into interactive, fillable forms. Just upload your document, and the platform will make it easy to type your answers directly into the fields.
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unlawful detainer forms: Judicial Council of California Form UD-150, Request/Counter-Request to Set Case for Trial—Unlawful Detainer, Form UD-100, Complaint—Unlawful Detainer, Judicial Council of California Form UD-105, Answer—Unlawful Detainer, Judicial Council of California Form UD-105, Answer—Unlawful Detainer, Judicial Council of California Form UD-150, Request/Counter-Request to Set Case for Trial—Unlawful Detainer, Judicial Council of California Form UD-100, Complaint—Unlawful Detainer, Form UD-101, Plaintiff's Mandatory Cover Sheet and Supplemental Allegations—Unlawful Detainer, Form SUM-130, Summons - Unlawful Detainer - Eviction, Form DISC-003/UD-106, Form Interrogatories—Unlawful Detainer, Form UD-110, Judgment—Unlawful Detainer, Judicial Council of California, Form UD-110P, Judgment—Unlawful Detainer Partial Eviction Attachment, Form UD-115, Stipulation for Entry of Judgment (Unlawful Detainer), Form UD-116, Declaration for Default Judgment by Court (Unlawful Detainer—Civ. Proc., § 585(d)), Form UD-120, Verification by Landlord Regarding Rental Assistance—Unlawful Detainer, UD-155, Eviction Case (Unlawful Detainer) Stipulation, Judicial Council of California Form UD-110H, Judgment—Unlawful Detainer Habitable Premises Attachment

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