How to File a Counterclaim in Montana Small Claims Court

When someone sues you in Montana small claims court, you're not limited to just defending. If the plaintiff owes you money from the same dispute, you can file a counterclaim and have both sides heard at the same hearing. A landlord sues for unpaid rent, but you're owed your security deposit back — that's a counterclaim. A contractor sues for an unpaid invoice, but you paid for work that was never finished — also a counterclaim.

The catch: Montana's counterclaim rules are stricter than most defendants expect, and the biggest one is a 72-hour service deadline that's easy to miscalculate.

The 72-Hour Service Rule

Your counterclaim must be served on the plaintiff at least 72 hours before the scheduled hearing time. Not 72 hours before the hearing date — before the exact time. If the hearing is set for Tuesday at 10:00 AM, service must be complete by Saturday at 10:00 AM.

This is not a filing deadline with the court — it's a service deadline on the plaintiff. The counterclaim form must be served by a sheriff or process server. You cannot hand it to the plaintiff yourself, mail it, or email it.

If you miss the 72-hour window, the court won't hear your counterclaim at the scheduled hearing. You'd need to file a separate action.

The $6,500 Counterclaim Cap

Montana limits small claims counterclaims to $6,500 under Department of Justice Office of Consumer Protection rules, even though the plaintiff's claim can go up to $7,000. If the plaintiff owes you more than $6,500 from the same transaction, you cannot split the claim to fit — you'd need to consult with an attorney about filing in the general civil division of Justice Court (up to $15,000) or District Court.

The counterclaim must also arise from the same transaction or occurrence as the plaintiff's original claim. You can't use a small claims counterclaim to bring up an unrelated debt.

Step-by-Step Filing Process

1. Get the form. Download the official Small Claims Counterclaim form from courts.mt.gov or pick one up from your local Justice Court clerk's office. It's a standardized form approved by the Montana Supreme Court Commission on Courts of Limited Jurisdiction.

2. Fill it out. List your name, the plaintiff's name, the case number from the original complaint, the amount you're claiming (up to $6,500), and a brief description of why the plaintiff owes you.

3. File with the clerk. Bring the completed form to the Justice Court clerk and check the local fee schedule. Carbon and Park County list a $30 counterclaim filing fee. If you can't afford the fee, file an Affidavit of Inability to Pay at the same time.

4. Arrange service. Contact the county sheriff's office or a process server to serve the counterclaim on the plaintiff. Carbon County lists a $65 sheriff service fee plus a $15 processing fee; fees vary by county. Build in time — you need service complete 72 hours before the hearing.

5. Verify the return of service. The sheriff or process server files a return of service with the clerk confirming delivery. Check with the clerk that this has been filed before the hearing date.

What Happens at the Hearing

Once the plaintiff is served with your counterclaim, Park County's rules require the plaintiff to pay a $20 appearance fee at check-in on the hearing date. The judge hears both the original claim and the counterclaim in the same proceeding. If the judge awards on both sides, the amounts are typically offset — if you owe $2,000 and the plaintiff owes you $3,000, the net judgment runs in your favor.

The Montana Small Claims Response Guide includes a counterclaim service log that tracks the filing date, the service deadline, and the return of service — designed around the compressed 72-hour window that catches most defendants off guard.

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