Roommate Rights in Montana
What Montana law says about sharing a lease — who owes what, what happens when someone leaves, and how to protect yourself before problems start.
•Joint Liability
Are You Liable for Your Roommate's Rent?
In Montana, all tenants on a joint lease are jointly and severally liable for the full rent amount. If one roommate stops paying, the landlord can pursue any or all remaining tenants for the entire balance.
Joint and several liability means the landlord does not care about your internal rent-splitting arrangement. If your roommate vanishes, you owe the full amount. This is the single most important thing to understand before sharing a lease. You can protect yourself with a written roommate agreement that spells out what happens if someone can't pay or wants to leave early.
•Subletting
Can You Sublet Your Room?
Subletting requires landlord consent. Montana law does not impose a reasonableness standard on sublease refusals.
Even if your state allows subletting, your lease may prohibit it. Read the subletting clause in your lease before making plans. If the lease is silent, check your state's default rules. When in doubt, get written permission from your landlord — verbal agreements are hard to enforce.
•Adding a Roommate
How to Add Someone to Your Lease
Process
Requires landlord approval and a lease amendment.
Never let someone move in without telling your landlord. Unauthorized occupants can be grounds for eviction in most states. Get the new person on the lease so everyone's rights and responsibilities are clear. The landlord may want to run a credit check — that's standard.
•Removing a Roommate
What Happens When a Roommate Wants to Leave
Process
Requires landlord consent and a new lease or amendment releasing the departing tenant.
The biggest mistake: assuming that moving out ends your lease obligations. In Montana, a departing roommate typically stays liable for rent through the end of the lease unless the landlord signs a written release. Get everything in writing. If you are the one leaving, push for a formal lease amendment that releases you from further liability.
•Security Deposits
How Security Deposits Work with Roommates
One deposit per lease. Montana requires return within 30 days (10 days if no deductions). The landlord returns to the tenants of record.
The landlord writes one check at the end of the lease — they do not split refunds among roommates. If one roommate caused damage, the landlord can still deduct from the full deposit. That means the roommate who did not cause the damage may lose their share. A roommate agreement can specify that the person who caused the damage is responsible for reimbursing the others.
•Key Facts
Key Facts About Roommate Law in Montana
- Montana does not cap security deposits.
- Deposits must be returned within 30 days (10 days if no deductions claimed).
- Joint and several liability applies to all co-tenants.
- Montana landlords can refuse subletting without giving a reason.
Source: Mont. Code § 70-25-201
•Roommate Agreements
What to Put in a Roommate Agreement
Your lease covers the relationship between tenants and the landlord. A roommate agreement covers the relationship between you and your roommates. It is a separate, private contract that is enforceable in court. Every shared living arrangement should have one.
- Rent split: Who pays what percentage, and when it is due
- Deposit ownership: Who paid what portion of the deposit and how refunds are split
- Utilities: How bills are divided and who is responsible for setting up accounts
- Shared spaces: Rules for common areas, cleaning schedules, guest policies
- Early departure: What happens if someone wants to leave before the lease ends — notice period, responsibility for finding a replacement
- Damage responsibility: Who pays if one roommate causes damage to the unit
- Quiet hours and noise: Basic ground rules so everyone can coexist
- Dispute resolution: How disagreements will be handled before they escalate
•Resources
Where to Get Help in Montana
- Legal Aid: Free civil legal help for low-income tenants. Search “legal aid Montana” or visit lawhelp.org.
- HUD Housing Counseling: Free help with landlord disputes. Call 1-800-569-4287.
- Small claims court: If a former roommate owes you money or your landlord wrongfully withheld the deposit, small claims is the fastest path. Filing fees run $30–$100, no lawyer needed.
- Tenant rights organizations: Search “tenant rights Montana” for local nonprofits that help with roommate and landlord disputes.
More Montana Guides
●Frequently Asked Questions
Frequently Asked Questions
Are all roommates responsible for the full rent in Montana?
Yes. Under joint and several liability in Montana, every tenant who signs the lease is responsible for the full rent — not just their share. If one roommate stops paying, the landlord can pursue the remaining tenants for the entire amount.
Can I sublease my room in Montana?
Subletting requires landlord consent. Montana law does not impose a reasonableness standard on sublease refusals. Always check your lease first — the written agreement between you and your landlord controls in most situations.
How do I add a roommate to my lease in Montana?
Requires landlord approval and a lease amendment. Get everything in writing and make sure the new occupant is listed on the lease before they move in.
What happens to the security deposit when a roommate moves out in Montana?
One deposit per lease. Montana requires return within 30 days (10 days if no deductions). The landlord returns to the tenants of record. This is one of the most common sources of roommate disputes. A written roommate agreement that specifies how the deposit will be divided can prevent fights later.
Do I need a roommate agreement in Montana?
While Montana does not legally require a roommate agreement, having one is strongly recommended. It can cover rent splits, deposit division, chore responsibilities, guest policies, and what happens if someone wants to leave early. Roommate agreements are enforceable as private contracts.
Can my landlord refuse to let me have a roommate in Montana?
In most cases, the landlord controls who lives in the unit through the lease. Requires landlord approval and a lease amendment. Some states and cities have laws limiting the landlord's ability to refuse additional occupants — check your local rules.
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DepositHawk is not a law firm and does not provide legal advice. Information and documents are for informational purposes only. No attorney-client relationship is created. Consult a licensed attorney for advice specific to your situation.