To fill out and file an unlawful detainer form, start with the right template for your court — a complaint if you are the landlord, an answer if you are the tenant — complete every numbered section using the lease, the pre-filing notice, and a current rent ledger, then file it with the court clerk, pay the filing fee (or submit a fee waiver), and make sure the papers are properly served on the other side within your jurisdiction’s deadline. The forms themselves are short, but the details are strict: a missing attachment, a miscounted notice period, or a wrong name on the caption is enough to sink the filing.
Find the Right Form for Your Court
Not every state uses the same name. Many courts label the landlord’s initial filing a “Complaint — Unlawful Detainer.” Others use “Eviction Complaint,” “Petition for Possession,” or “Complaint in Summary Ejectment.” The tenant’s response may be called an “Answer — Unlawful Detainer,” an “Appearance,” or simply an “Answer.” Some states use “forcible entry and detainer” in place of “unlawful detainer” entirely. The function is the same regardless of label.
Several high-volume states publish numbered fill-in-the-blank templates. California’s Judicial Council designates the complaint as Form UD-100 and the answer as Form UD-105.1Judicial Council of California. Complaint—Unlawful Detainer2Judicial Council of California. Answer—Unlawful Detainer Illinois publishes a standardized Eviction Complaint and Eviction Summons through its court system.3Office of the Illinois Courts. Eviction Other jurisdictions hand you blank pleading paper and expect you to draft from scratch or use a local template at the clerk’s office. Check your court’s self-help website before you start. Using the wrong form or format is one of the easiest ways to get your case stopped at the filing window.
Filling Out the Complaint (Landlord)
The complaint tells the court who owns the property, who is occupying it, why that person no longer has a legal right to stay, and what the landlord wants the court to do about it. Most courts also require a summons (which notifies the tenant that a lawsuit has been filed) and a civil case cover sheet (which gives the clerk basic administrative data about the case type and amount at stake).4Judicial Council of California. Civil Case Cover Sheet
Before filling in any fields, pull three things together:
- The lease or rental agreement. You will need the exact property address, the names of all tenants on the lease, the monthly rent amount, and the lease term or expiration date.
- The pre-filing notice you served — a notice to pay rent or quit, a notice to cure a lease violation, or a notice to vacate. Keep the notice itself and proof it was properly delivered.
- A rent ledger or payment history. If you are claiming unpaid rent, calculate the exact amount owed through the date of filing. Courts want a specific dollar figure, not an estimate.
The form walks through these items in numbered sections. You will identify the property, describe the landlord-tenant relationship, state which type of notice was served and when, confirm the notice period expired without compliance, and assert that the tenant remains in possession. Most forms also ask whether you are seeking money damages in addition to possession. If you are, you will need to calculate holdover damages, which represent the value of continued occupancy after the notice expired. Courts typically treat the agreed rent as evidence of that value, though a judge can award a higher or lower amount based on the circumstances.
Where landlords most often trip up: listing the wrong tenant names (use the full legal names from the lease, plus “and all other occupants” or your jurisdiction’s equivalent for unnamed residents), failing to attach a copy of the notice, or miscalculating the notice period. If your three-day notice was served on a Friday, check whether your state excludes weekends and court holidays from the count. Many do. A notice that expired one day too early will get the entire case thrown out.
One narrow boundary worth flagging: if the property is public housing or operates under a project-based rental assistance program, federal rules impose their own pre-filing notice requirements that override shorter state timelines, and the notice itself must include specific disclosures about the amount owed, income recertification, and available emergency rental assistance.5Nixon Peabody LLP. HUD Rescinds 30-Day Notice Requirement for Nonpayment Evictions in Public Housing and PBRA Programs If that describes your property, confirm the current federal rule before you file.
Filling Out the Answer (Tenant)
The answer responds to each allegation in the complaint — admitting what is true, denying what is not, and raising any defenses that apply. If you have been served, filling out and filing this form on time is the single most important thing you can do. Miss the deadline and the landlord can take a default judgment, which ends your right to contest the eviction at trial.
Copy the case number and court name from the summons onto the top of the answer form. Then work through the numbered sections, which mirror the paragraphs in the complaint. For each allegation, check a box or write a statement indicating whether you admit, deny, or lack enough information to respond. Be specific where you deny something. If the landlord says you owe $3,000 in back rent and your records show $1,800, state the amount you believe is correct.
Most answer forms include a dedicated section for affirmative defenses. Fill out every section that applies to your situation. Leaving a defense blank means the court will not consider it, even if the facts would have supported it.
The answer form is available from the same court where the case was filed, either at the clerk’s office window or on the court’s self-help website. Some courts provide guided online interviews that generate the completed form based on your plain-language responses.
Filing and Paying the Fee
Once the form is complete, file it with the court clerk. Most courts accept filings in person, and an increasing number support electronic filing through an online portal. Ask the clerk’s office which method your court uses before making the trip.
The landlord pays a filing fee when submitting the complaint. Amounts vary widely, from under $100 in some jurisdictions to over $400 in others, and the fee is often scaled by the amount of money claimed. If you cannot afford it, most courts allow you to request a fee waiver by submitting a separate form along with your filing. Eligibility is generally based on household income, and the court reviews the request before accepting the papers.
Tenants filing an answer also pay a fee in most jurisdictions, though it is typically lower. The same fee waiver process applies. Do not let the cost stop you from filing. An unfiled answer results in a default judgment, which is far more expensive than any court fee.
Serving the Papers After Filing
After the clerk stamps and processes the complaint and summons, the landlord must have the documents formally delivered to the tenant. Service of process must be performed by someone who is at least 18 years old and is not a party to the lawsuit. A professional process server, a county sheriff, or any qualified adult can do it.
The standard method is personal service — handing the papers directly to the tenant. After completing service, the server fills out a proof of service form (a sworn statement recording the date, time, location, and method of delivery) and files it with the court. Without a properly completed proof of service, the case cannot move forward.
If the server cannot physically hand the papers to the tenant after reasonable attempts, most jurisdictions allow substituted service: leaving the documents with another adult at the tenant’s home or workplace and then mailing a second copy to the tenant’s address. Some states require a minimum number of personal service attempts (often two or three, on different days and at different times) before switching methods.
As a last resort, many courts permit service by posting, sometimes called “nail and mail.” The server posts the documents conspicuously on the rental property (usually taped to the front door) and mails another copy. This method almost always requires a judge’s advance permission, and you will need to submit a declaration describing every failed attempt before the court will authorize it.6California Courts. Serve Eviction Papers by Posting and Mailing The tenant’s deadline to respond is longer when served by posting and mailing, because the law builds in extra days to account for the less reliable delivery method.
Response Deadlines and What Happens If You Miss One
Unlawful detainer cases move on a compressed schedule. The tenant’s deadline to file an answer is much shorter than in an ordinary civil lawsuit, often 5 to 10 court days for personal service and longer (frequently 15 to 20 days) for substituted or posted service. The exact count depends on your jurisdiction, and most states exclude weekends and court holidays from the tally. Check the summons itself, which should state the deadline, and confirm it against your local court rules.
If the tenant does not file an answer by the deadline, the landlord can ask the court for a default judgment. The court then decides the case without a trial and without hearing from the tenant. The landlord can request a judgment for possession only, for possession plus money owed, or for money only if the tenant has already vacated.7California Courts. Ask for a Default Judgment Once a default is entered, the tenant loses the right to file an answer in the normal course.
A tenant who missed the deadline is not entirely out of options. Most states allow a motion to set aside a default judgment if the tenant can show good cause — a reason the response was late that was not simply neglect. Courts generally require this motion to be filed within a short window, sometimes as few as 10 days after the default judgment was entered.8Michigan Courts. Motion to Set Aside Default Possession Judgment Some courts also require the tenant to deposit one month’s rent with the court as a condition of relief. The odds drop sharply the longer you wait. If you have a default against you and believe you had a valid defense, act immediately.
Defenses That Belong on the Answer
The affirmative defenses section is where the tenant raises legal reasons the eviction should fail even if some of the landlord’s factual allegations are true. These defenses must be raised in the answer or they are waived. The ones that come up most often:
- Defective notice. The pre-filing notice was missing required information, was served improperly, or did not give enough time. This succeeds more often than any other defense because notice rules are strict and landlords regularly get the details wrong.
- Uninhabitable conditions. The landlord failed to maintain the property in a livable condition — no heat, persistent mold, broken plumbing, or pest infestations. Under the implied warranty of habitability, recognized in a large majority of states, the obligation to pay rent depends on the landlord keeping the property safe and fit for occupancy. If conditions were genuinely dangerous, the court may reduce the rent owed or dismiss the case.9Legal Information Institute. Implied Warranty of Habitability
- Retaliation. The landlord filed the eviction in response to the tenant exercising a legal right, such as reporting code violations, requesting repairs, or organizing other tenants. Many states presume retaliation when an eviction is filed within a set period, often 90 to 180 days, after the tenant’s protected activity.10Legal Information Institute. Retaliatory Eviction
- Discrimination. The eviction was motivated by the tenant’s race, religion, sex, national origin, disability, or familial status, all protected under the federal Fair Housing Act.
- Acceptance of rent. The landlord accepted rent after serving the notice, which in many jurisdictions resets or waives the notice period.
Active-duty servicemembers have an additional federal defense under the Servicemembers Civil Relief Act. For 2026, a landlord cannot evict a servicemember or their dependents from a primary residence without a court order when the monthly rent is $10,542.60 or less, and the court must stay the case for at least 90 days if military service has materially affected the servicemember’s ability to pay.11Office of the Law Revision Counsel. 50 USC 3951 – Evictions and Distress12Federal Register. Notice of Publication of Housing Price Inflation Adjustment If this applies, note it in the answer and attach proof of status.