Montana ยท Unpaid invoice

Unpaid invoice in Montana small claims

Client won't pay your invoice? Collect it in small claims.

If a client or customer has not paid an invoice for work you delivered or goods you sold, small claims court is a low-cost way to collect. You do not need a lawyer. The strength of your case usually comes down to clear proof: the agreement or terms, the invoice, evidence the work or goods were delivered, and a record of your attempts to collect.

In Montana, small-claims cases are heard in the Small Claims Court (a division of the Justice Court) and you can sue for up to $7,000 (exclusive of costs).

Unpaid invoice: steps that matter

  1. Send a final written demand (a clear statement of what is owed and a payment deadline) and keep proof you sent it.
  2. Gather your contract or written terms, the invoice, delivery/completion proof, and any messages showing the other side accepted the work.
  3. Confirm you are within the statute of limitations below before you file.
  4. File in the correct court for where the defendant is or where the work happened, and keep every date and document together.

Filing your sworn Complaint in Montana

  1. Prepare the complaint. Prepare a written complaint stating the facts, the amount demanded (up to $7,000, excluding costs) or property sought, and the transaction date. It must be sworn before the court.
  2. Prepare the service papers. Prepare a praecipe and copies for each defendant: the instructions call for two copies of the complaint, two Notices to Defendant, and one praecipe per defendant.
  3. File and swear the documents with the clerk. Take the documents to the Justice Court clerk to be sworn and filed, and pay the filing fee.
  4. Serve the defendant. The sheriff or a process server serves the Notice to Defendant and complaint. If the defendant is not served at least 5 days before trial, the court resets the date.
  5. Appear for trial. Attend the trial on the set date. If you settle beforehand, notify the court.

Filing fees: The official instructions state a $30 Justice Court filing fee, plus service costs (including mileage) that vary by county and server. Confirm current amounts with the local Justice Court clerk.

Deadline that applies to your unpaid invoice

An unpaid invoice is usually a contract or account claim. If you had a signed agreement or written terms, the written-contract statute of limitations below typically applies; a purely verbal deal usually falls under the oral-contract period. That statute is the deadline to file, so do not wait too long.

Written contract (instrument in writing): 6 years (MCA 27-2-202(1))

Answering a lawsuit: No written answer is required before trial; the defendant appears on the trial date. A counterclaim must be served on the plaintiff at least 72 hours before the hearing.

Serving the defendant: The sheriff or a process server serves the Notice to Defendant and complaint. If the defendant is not served at least 5 days before trial, the court resets the trial date and orders re-service.

Appeals: Either party may appeal to the district court within 10 days of judgment. The appeal is limited to questions of law; there is no new trial.

This page is general information, not legal advice, and CaseBySelf is not a law firm. Rules, fees, and deadlines change and vary by court: verify with the specific court where you file. Source: Montana Judicial Branch: Small Claims (Limited Jurisdiction Court Benchbook). Last reviewed 2026-06-24.