The 30-day window closed. Now you file.
Montana's security deposit statute is blunt. Your landlord had 30 days from the date you vacated to either hand back your deposit or give you a written, itemized accounting of every deduction. That deadline is in Mont. Code Ann. § 70-25-201, and it is not a suggestion. If that window closed without a full refund and a proper statement, you have a statutory claim that Justice Court is built to hear.
Before you file, though, one question: did you send a written demand first? Judges in Montana small claims courts notice when a tenant walked in cold without ever putting the landlord on notice. A written demand citing the statute and giving a short response window typically resolves 85% of deposit disputes on its own. If you haven't sent one yet, send a Montana demand letter for your withheld deposit before you spend money on filing fees. It's the faster and cheaper first step.
If you already sent the letter and the landlord ignored it or refused to pay, this page is for you.
What Montana law says about security deposits
Montana's residential security deposit law, Mont. Code Ann. §§ 70-25-101 through 70-25-206, is one of the more landlord-accountability-focused frameworks in the Mountain West. The key pieces for a Justice Court filing are:
Mont. Code Ann. § 70-25-201 requires the landlord to act within 30 calendar days of the tenant vacating. The landlord's options are narrow: return the full deposit, or return whatever remains after lawful deductions together with a written itemized statement explaining every dollar kept. Both the money and the statement must arrive within 30 days. Sending the statement late, even by a day, forfeits the procedural protection the statute provides.
Mont. Code Ann. § 70-25-206 is where the teeth are. If a landlord wrongfully refuses to refund or fails to deliver the itemized statement on time, the tenant is entitled to twice the wrongfully withheld amount. That multiplier applies to the withheld portion, not the full deposit. On a $2,000 deposit where the landlord kept $1,400 without justification, the penalty calculation is $1,400 (principal) plus $2,800 (2× penalty) for a total of $4,200, well within the $7,000 Justice Court ceiling.
Attorney's fees are also recoverable under § 70-25-206. In practice, this means a landlord fighting a meritless withholding faces not just the doubled damages but also the tenant's legal costs if they hired a lawyer. That exposure often breaks logjams that the demand letter alone could not.
Montana's statute does not cap security deposits at a specific number of months' rent. Whatever amount you paid, the full framework of § 70-25-206 applies to it.
Calculate the exact amount before you fill out the form
Montana Justice Court is capped at $7,000 per Mont. Code Ann. § 3-10-301. Most deposit disputes, even with the penalty, fall under that ceiling. Here is how to build the number:
The principal. The portion actually withheld without a lawful basis. If your landlord kept $900 of a $1,500 deposit and the $900 is indefensible, that is your starting number. Do not add the full deposit unless nothing was returned.
The 2× penalty. Double the wrongfully withheld amount under § 70-25-206. Applied to the principal only. The penalty does not stack on top of the entire deposit if part of the retention was lawful.
Documented costs. Filing fees (set by your local Justice Court, typically $30 to $100), any process-server fees, and documented out-of-pocket expenses that flow directly from the dispute. Keep all receipts.
Write the math down before you touch form SC-100. A claim that names a specific dollar figure and explains how it was calculated signals to the judge that you understand the statute and did the work.
Calculator
What you may be owed
Estimate only. Uses your state's return window and bad-faith multiplier. Not legal advice.
Montana Justice Court: where to file and what forms you need
Montana small claims cases go through Justice Court, not District Court. Every county has a Justice Court, and you file in the county where the rental property is located. That is where the dispute arose, and that is where venue properly lies under Montana rules.
Montana Justice Courts are not uniform in their procedures. Some accept filings by mail. Others require you to appear in person at the clerk's window during specific hours. A few have started accepting electronic filings. Call the clerk's office before you show up with a stack of papers.
The core documents you will prepare:
- Complaint form. The standard Justice Court small claims complaint. Ask the clerk which form they use; Montana has not fully standardized small claims forms across all 56 counties, so the clerk's office is the authoritative source for the right document.
- Summons. The court issues this after you file; you typically do not draft it yourself.
- Service documentation. Evidence that the defendant was properly served.
Filing a claim with an error in the defendant's name or address is the single most common cause of delays in Montana small claims. If your landlord is an LLC or property management company, look them up in the Montana Secretary of State's business entity database and use the exact registered name and registered-agent address.
What to bring to the Justice Court hearing
Montana Justice Court hearings are short. Judges typically give each side ten to fifteen minutes. You will not have time to tell a narrative. The evidence has to speak for itself, organized in the order that follows the statutory timeline.
Bring three copies of everything, one for you, one for the judge, one for the landlord.
The lease. The full signed agreement. If there is a move-in checklist attached, bring that too.
Proof of deposit payment. A bank statement, canceled check, or money-order receipt showing you paid the deposit and the amount.
Move-in and move-out documentation. Date-stamped photos from both ends of the tenancy. A written walkthrough checklist if you completed one. Video if you have it.
The 30-day paper trail. The date you vacated, how you communicated it to the landlord, any keys returned or termination notices. If you gave written notice of your move-out date, bring the copy.
The demand letter with tracking. The written demand you sent, along with USPS Certified Mail tracking confirming delivery. This shows the judge you gave the landlord a second chance before filing.
The landlord's response, or the absence of one. Any emails, texts, letters, or itemized statements they sent. If they sent nothing, document that: a screenshot of your inbox with no response, a note of the date the 30-day window expired.
Counter-evidence to claimed deductions. If the landlord claims damage, bring photos showing the unit's condition at move-out. Get a written estimate from a licensed contractor for the actual repair cost if the landlord's figure is inflated.
Serving your landlord correctly
Filing the complaint starts the case. Serving the defendant makes it move. Montana Justice Courts require proper service before a hearing can be held, and defective service is the most common reason cases get postponed.
The defendant must be personally served. You cannot serve them yourself. Options in Montana:
County sheriff. Reliable and affordable, usually $25 to $50 depending on the county. Processing time varies; rural counties can take longer.
Registered process server. Faster in most cases, especially in larger counties like Cascade, Yellowstone, or Missoula. Cost runs $50 to $100.
Acceptance of service. If the landlord agrees in writing to accept service (sometimes they do when they know the claim is coming), that can substitute for formal service, but get it in writing.
After service, the process server or sheriff files a completed proof of service with the court. Check with the clerk to confirm it was received before your hearing date.
What happens at the hearing
You will check in with the clerk, wait for your case number to be called, and then address the judge directly. You speak first as the plaintiff. Walk through three things in order: the statute (Mont. Code Ann. § 70-25-201 and § 70-25-206), the timeline (when you vacated, when the 30 days expired, what the landlord did or did not do), and your calculation (principal withheld plus the 2× penalty, with the math shown).
Then hand up your evidence in that order. Keep your presentation to the evidence; do not editorialize about what kind of landlord they are.
The landlord will respond. They will likely argue either that the deductions were valid or that the statement was timely. Your move-in photos and the certified-mail tracking on your demand letter will carry most of the weight against those arguments.
Montana Justice Court judges see deposit cases regularly. Citing the statute by number, presenting a clean timeline, and showing you sent a written demand before filing are the three things that separate winning plaintiffs from ones who leave court empty-handed.
After both sides speak, the judge either rules immediately or takes the matter under advisement. A written ruling arrives by mail if not issued from the bench. Most straightforward deposit cases resolve at the hearing.
If the landlord still won't pay after judgment
A judgment in your favor is a legally enforceable order. Most Montana landlords pay once the judgment is entered, especially given that the 2× penalty and attorney's fee exposure made the dispute expensive for them. If payment does not arrive within 30 days, collection tools are available.
You can record the judgment as a lien against any real property the landlord owns in Montana by filing an Abstract of Judgment with the county clerk. You can also apply for a Writ of Execution authorizing the sheriff to seize bank funds or non-exempt personal property up to the judgment amount. Montana judgments accrue post-judgment interest, which adds ongoing cost to delay.
If the landlord ignored your demand letter entirely and you have not yet sent one, you can still do it now, even mid-litigation, as a settlement probe. Some landlords resolve the case between filing and the hearing date when they see the paperwork and realize the 2× exposure is real.