How to File Small Claims Court Missouri

Someone owes you money and will not pay. Maybe a contractor disappeared with your deposit, a landlord kept your security deposit without explanation, or a customer never paid your invoice. Missouri's small claims court is built for exactly this situation — claims up to $5,000, no lawyer required, and a hearing date set according to the circuit's schedule. Here is how to actually get the case filed.

Step 1: Send a Demand Letter

A demand letter is not legally required for most claims, but it accomplishes two things. First, it often resolves the dispute without court — people pay when they realize you are serious. Second, for an unpaid account with a specific amount due, a written demand can support a request for prejudgment interest at 9% per annum under RSMo § 408.020. Interest on a written contract can accrue once the amount is due and payable.

Your letter should include the recipient's full legal name, a clear description of what happened, the exact amount you are demanding, a payment deadline (10 to 14 business days is standard), and copies of supporting documents. Send it via certified mail with return receipt requested so you have proof of delivery.

Step 2: Identify the Correct Defendant

This is where a surprising number of cases go wrong. If you name the wrong entity on the petition, the judgment is unenforceable.

• Individual or sole proprietor: use their legal name, adding "d/b/a [trade name]" if they operate under a business name
• LLC or corporation: use the exact legal entity name registered with the Missouri Secretary of State — search their business entity database online
• Partnership: name each individual general partner

For businesses, also look up the registered agent's name and address. That is where you will need to direct service.

Step 3: Pick the Right County

Missouri's venue rules (RSMo § 482.330) let you file in the county where the defendant lives, the county where the transaction or injury happened, or the county where you live if the defendant can be found and served there. Filing in the wrong county gives the other side an easy out — a motion to transfer or dismiss.

Step 4: Fill Out the Petition (Form SC40)

Download form SC40 from courts.mo.gov or pick up a copy at the Associate Circuit Clerk's office. The form asks for both parties' names and physical addresses (no P.O. boxes), the dollar amount (up to $5,000), the date the claim arose, and a brief factual narrative.

You also sign a sworn statement confirming you are the original party (not a debt buyer), you have not filed more than 12 other small claims in Missouri during the current calendar year, you waive a jury trial, and you accept the $5,000 cap (RSMo § 482.330).

Redact sensitive identifiers — Social Security numbers, bank account numbers — from the petition itself. Those go on a separate confidential information sheet filed alongside it.

Step 5: File and Pay

Take (or mail) the petition, confidential sheet, and your payment to the Associate Circuit Clerk. Base filing fees range from about $20.50 to $45 depending on the county; most counties add a $3.50 surcharge. Most clerks accept cash, cashier's checks, or money orders. Some counties allow electronic filing through the Missouri Courts portal.

The clerk date-stamps the petition, assigns a case number, issues a summons, and schedules a hearing date.

Step 6: Serve the Defendant

The defendant must receive the summons and petition at least 10 calendar days before the hearing. You have three options:

• Sheriff service — $46 per defendant (RSMo § 57.280)
• Certified mail via the clerk — $10–$15 per defendant
• Special process server — a court-appointed private individual (must be over 18 and disinterested)

If certified mail comes back unsigned or refused, you switch to the sheriff. If the sheriff cannot find the defendant, you request an alias summons (reissued) and try again with an updated address.

What Happens Next

Once the defendant is served, you prepare for the hearing — organize your evidence into three sets (one for the judge, one for the defendant, one for yourself), line up any witnesses, and show up on the scheduled date.

For the complete process — including hearing preparation, evidence rules, and the 10-day Trial De Novo appeal deadline — our Missouri Small Claims Filing Guide covers every step with printable worksheets and a deadline calendar.

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