How to File a Civil Lawsuit in Missouri: Court, Petition, and Service

To file a civil lawsuit in Missouri, you draft a petition, file it with the circuit clerk in the correct county before your statute of limitations expires, pay the filing fee, and arrange for the defendant to be formally served with a copy of the petition and a summons. Missouri uses the word “petition” rather than “complaint” for the document that starts the case, and the state’s rules require you to plead specific facts, not just legal theories.1Missouri Revisor of Statutes. Missouri Code 509.010 – Shall Be Petition and Answer, Reply if Answer Contains Counterclaim The order of the steps below matters, because a mistake early on (a missed deadline, the wrong county, bad service) can sink the case regardless of how strong the facts are.

Check Your Filing Deadline Before Anything Else

Every civil claim in Missouri has a statute of limitations. The clock runs from the date of the harm, not the date you decide to sue, and if it expires the court will almost certainly dismiss the case.

Fraud falls under the five-year category, but the clock does not start running until you actually discover the fraud. Even with delayed discovery, there is a hard outer limit of ten years from the date the fraud occurred.3Missouri Revisor of Statutes. Missouri Code 516.120 – What Actions Within Five Years

Pick the Right Court and Division

Missouri’s trial courts are organized as circuit courts, with one in every county. Inside each circuit court, different divisions handle different sizes of cases, and the amount in dispute (and the type of relief you want) tells you where to file.

  • Small claims handles cases seeking $5,000 or less. Filing fees are lower, evidence rules are relaxed, and lawyers are allowed but not required.
  • The associate circuit division handles civil cases where the amount in dispute is $25,000 or less.5Missouri Revisor of Statutes. Missouri Code 517.011 – Associate Circuit Judge Jurisdiction
  • The general civil division of the circuit court handles cases above $25,000 and any case seeking non-monetary relief, such as an injunction.

The division affects your filing fees, the pretrial procedures you have to follow, and whether you can request a jury. If the dispute is under $5,000 and straightforward, small claims is almost always the better route.

Pick the Right County (Venue)

Venue is the legal term for which county your case belongs in. File in the wrong one and the defendant has an easy basis to get the case transferred or dismissed.

For non-tort claims, such as breach of contract, you can file either in the county where the defendant lives or in your own county if the defendant can be found there. If there are multiple defendants living in different counties, you may file in any county where at least one of them resides.6Missouri Revisor of Statutes. Missouri Code 508.010 – Venue, Civil Actions

Tort claims (negligence, assault, property damage, and similar injuries) follow a different rule. If you were injured in Missouri, you file in the county where you were first injured. If you were injured outside Missouri, venue is typically where the defendant corporation’s registered agent is located, or in your home county if you lived in Missouri when the injury happened.6Missouri Revisor of Statutes. Missouri Code 508.010 – Venue, Civil Actions

Draft the Petition

Missouri is a fact-pleading state. Your petition has to lay out the specific facts supporting your claim, not just a general theory of why you should win. A proper petition includes:

  • The parties: full legal names and addresses of every plaintiff and defendant.
  • The facts: a clear, chronological account of what happened, with dates, locations, and the specific conduct that caused your harm.7Missouri Revisor of Statutes. Missouri Code 517.031 – Petition Required, Form
  • The legal claims: each legal theory you are asserting (negligence, breach of contract, fraud, and so on), pleaded as a separate “count.”
  • The relief requested: exactly what you want the court to do, whether that is a specific dollar amount, an order requiring the defendant to do or stop doing something, or both.

You also need a summons, which is the court’s formal notice telling the defendant they have been sued and must respond. Blank petition and summons forms are available from your circuit clerk’s office and from the Missouri Courts website. Every field has to be filled in accurately, and the names on the summons must match the names on the petition exactly.

Some Missouri claim types require a verified petition, meaning you sign a sworn statement that the facts are true to the best of your knowledge. Check whether your claim type requires verification before filing; an unverified petition in a case that needs one can be challenged as defective.

File the Petition and Pay the Fee

Take your completed petition and summons to the circuit clerk’s office in the county where venue is proper. Bring extra copies. The clerk keeps the original for the court file, and you need at least one copy for each defendant you plan to serve, plus one for your own records.

Filing fees vary by county and case type. Based on publicly posted county fee schedules, small claims filings typically run between $20 and $40, associate circuit filings around $50 to $55, and general civil circuit cases roughly $100 to $110. A separate fee covers service on the defendant, and its amount depends on the method used.

The clerk will stamp your documents with the filing date and assign a case number. Write it down. That number goes on every document you file for the rest of the lawsuit.

Some Missouri counties allow electronic filing, letting you upload the petition and pay fees without going to the clerk’s office in person. Check with your county’s circuit clerk to see whether e-filing is available for your case type. If you are mailing documents instead, send them by a trackable method so you can prove they were received.

If You Cannot Afford the Fees

Missouri law lets you ask the court to waive filing fees if you cannot afford them. You have to show the court that you are unable to pay the costs of the lawsuit. If the court is satisfied, it can let you proceed without paying fees, taxes, or other charges, and it can also assign an attorney to handle the case without charge.8Missouri Revisor of Statutes. Missouri Code 514.040 – Poor Person May Sue Without Costs

One catch: if you win a judgment, the court will order the other side to pay costs, and those recovered costs go to the court officers who waived their fees, not to you.

Serve the Defendant

Filing starts the case, but the defendant is not really in it until they have been formally served with copies of the petition and summons. Missouri courts take this seriously. A judgment against someone who was never properly served is vulnerable to being thrown out later.

Missouri allows several methods:

  • Sheriff or private process server. The most common method. The sheriff’s office or a private individual (at least 18, and not a party to the case) personally delivers the petition and summons to the defendant.
  • Substituted service at the defendant’s home. If the defendant is not personally available, the server can leave copies at the defendant’s home with a household member who is at least 15 years old.
  • First-class mail with acknowledgment. You mail the petition and summons along with a notice-and-acknowledgment form. The defendant has to sign and return the acknowledgment for this to count as valid service.
  • Service on a business. For a corporation or partnership, the server delivers copies to an officer, managing agent, or the company’s registered agent in Missouri.

Once service is done, proof of service must be filed with the court. For personal delivery by the sheriff, this is usually a return-of-service form. For mail service, the clerk files a certificate confirming the mailing along with the signed return receipt.

If you cannot locate the defendant after reasonable efforts, Missouri allows service by publication in a newspaper, but only with court approval. It is a last resort and shows up most often in cases involving property or where the defendant has left the state.

What Happens After the Defendant Is Served

Missouri generally gives defendants 30 days from the date of service to file a written response, called an answer. In the answer, the defendant can deny your allegations, raise defenses, or file counterclaims against you.1Missouri Revisor of Statutes. Missouri Code 509.010 – Shall Be Petition and Answer, Reply if Answer Contains Counterclaim If the defendant files a counterclaim, you have to file a reply to it.

If the defendant ignores the lawsuit and does not file any response within the allowed time, you can ask the court for a default judgment. The court will still check that service was properly completed and that your petition states a valid claim, and for money damages you may need to present evidence of the amount owed. The court will not simply hand you whatever figure you wrote in the petition without some support.

Filing Without a Lawyer

Representing yourself is legally permitted in Missouri, but the court will hold you to the same procedural rules as a licensed attorney. A few habits go a long way:

Keep copies of everything you file, every letter you send, and every receipt for fees paid. If you cannot prove you did something, the court will treat it as if you did not.

Do not wait until the last week before your statute of limitations expires to start preparing. Drafting the petition, tracking down the right forms, sorting out venue, and paying fees all take time, and service alone can drag on for weeks if the defendant is hard to locate.

Watch the deadlines the court sets after filing. Scheduling orders lay out specific dates for discovery, motions, and trial preparation, and missing one can bring sanctions or even dismissal. If you need more time, file a written motion asking for an extension before the deadline passes, not after.

Many Missouri attorneys offer limited-scope representation, meaning they will review your petition or advise on strategy without taking over the whole case. An hour of legal advice before you file can save months of trouble later.