Pet Deposits, Pet Rent & ESA Rules in Montana 2026
State pet-deposit treatment, federal Fair Housing Act assistance-animal rules, and what Montana landlords can and cannot ask.
In Montana, ordinary pets and assistance animals sit on opposite sides of the law. A pet is a lease matter: you can restrict breed, size, and number, ban animals entirely, or charge a pet deposit and pet rent. A service animal or emotional support animal (ESA) is not a pet under the federal Fair Housing Act, and Montana has layered its own rules on top through MCA 70-24-114. Getting the line wrong is where landlords create discrimination exposure. This page covers what you can charge, when you must accommodate, and exactly what documentation the statute lets you ask for.
How Montana Treats Pet Deposits
Montana has no statutory cap on the security deposit or pet deposit. Mont. Code § 70-25 governs the deposit but sets no maximum.
Pets are a lease decision; assistance animals are not
Montana's Residential Landlord and Tenant Act (Title 70, Chapter 24, MCA) does not force you to allow pets. For genuine pets you may adopt a no-pets policy, cap the number of animals, set breed and weight limits, and charge a refundable pet deposit plus monthly pet rent. Those terms live in the lease, not in statute.
The analysis flips entirely once an animal qualifies as a service animal or an emotional support animal. Both are treated as assistance animals and are exempt from your pet policy. A no-pets building must still accommodate a qualified assistance animal, and you cannot charge a pet deposit, pet rent, or any pet fee for one. You keep the right to recover for actual damage the animal causes, which is a different thing from a fee charged up front.
Service animals: what you can and cannot ask
Under Montana and federal law a service animal is a dog (or, under the ADA, a miniature horse) individually trained to do work or perform tasks for a person with a disability. Comfort, companionship, and emotional support are not tasks, so an animal providing only those is an ESA, not a service animal.
When the disability and the animal's role are not obvious, you may ask two questions and no more: is the animal required because of a disability, and what work or task has it been trained to perform. You may not demand certification, an ID card, a vest, a live demonstration, or any medical proof. Deliberately passing off an untrained pet as a service animal is addressed by MCA 49-4-221 and 49-4-222 as a misdemeanor, though the process generally requires a written warning before a citation issues, so it is not a self-help tool for landlords.
Emotional support animals under MCA 70-24-114
Montana's ESA statute, MCA 70-24-114 (added by HB 703, effective October 1, 2023), spells out what documentation you may require. When a tenant's disability-related need for an ESA is not readily apparent, you may request supporting documentation from a health care practitioner that includes the effective date, the practitioner's license number, and the type of professional license. You may also require proof of state and local licensure and vaccination, and separate information for each animal if the tenant requests more than one.
The statute draws a hard privacy line: you may not request information that discloses the tenant's diagnosis, the severity of the disability, or any medical records relating to it. It also states that an online registration, certificate, or patch is not by itself enough to establish a legitimate need, so those printouts neither prove nor defeat a request.
The 30-day relationship rule and denials
The most consequential piece of MCA 70-24-114 for verification is the timing requirement: the health care practitioner who signs the supporting documentation must have established a client-provider relationship with the tenant at least 30 days before providing it. A same-day letter bought from an online mill does not meet the standard, and you may treat documentation that fails this test as insufficient.
You may deny an assistance-animal request only for narrow, evidence-based reasons: the specific animal poses a direct threat to the safety or health of others, or a direct threat of physical damage to the property that cannot be reduced or eliminated by another reasonable accommodation. A denial must rest on that individual animal's actual conduct or history, never on breed, size, or a blanket assumption. Document your reasoning in writing before you refuse.
Fees, damage, and staying compliant
You cannot charge a pet deposit, pet rent, or an assistance-animal fee for a service animal or ESA. What you can do is hold the tenant financially responsible for what the animal actually does. MCA 70-24-114 expressly makes a tenant liable for any damage done to the premises or to another person on the premises by their emotional support animal, and ordinary security-deposit rules cover damage beyond normal wear.
Practical guardrails: apply your pet screening and interview process only to genuine pets, respond to accommodation requests promptly and in writing, keep documentation requests limited to what the statute allows, and route close calls through counsel or the Montana Human Rights Bureau rather than issuing a flat denial. Housing discrimination complaints in Montana run through that bureau and, federally, through HUD under the Fair Housing Act.
The Cost of Mishandling a Montana ESA Request
The most common mistake in Montana ESA cases is responding with a flat denial, "no pets means no pets", instead of engaging in the interactive process. The interactive process is itself a substantive duty. A landlord who refuses to consider the request, demands more documentation than HUD permits, or imposes a pet fee on an accepted assistance animal will lose at HUD even if the underlying accommodation could have been reasonably denied on its merits.
City-Level Eviction Risk in Montana
Pet-related eviction filings correlate with overall landlord-tenant litigation rates. View landlord risk and tenant-law profile by city:
Sources & Methodology
- Federal Fair Housing Act: 42 U.S.C. § 3604(f)(3)(B); 24 C.F.R. § 100.204; 24 C.F.R. § 180.671.
- HUD guidance: HUD FHEO Notice 2020-01 (Jan 28, 2020), assistance animals as a reasonable accommodation.
- ADA service animals: 28 C.F.R. § 36.302 (Title III, public accommodations).
- Montana pet deposit rule: Mont. Code § 70-24-422.
Related Guides for Montana Landlords
This page summarizes the Montana Residential Landlord and Tenant Act (Title 70, Chapter 24, MCA), the emotional support animal provisions of MCA 70-24-114 added by HB 703 (effective October 1, 2023), the service-animal misrepresentation provisions at MCA 49-4-221 and 49-4-222, and the federal Fair Housing Act. Enforcement of housing discrimination claims runs through the Montana Human Rights Bureau (Department of Labor & Industry) and, federally, HUD. It is general information for landlords, not legal advice; statutes and their interpretation change, so confirm the current text of MCA 70-24-114 and consult a Montana attorney before denying an accommodation or drafting pet terms.
Frequently Asked Questions
Can a Montana landlord charge a pet deposit or pet rent for a service animal or ESA?
No. Service animals and emotional support animals are not pets under the Fair Housing Act, so you cannot charge a pet deposit, pet rent, or any pet fee for them. You can still recover for actual damage the animal causes; MCA 70-24-114 makes the tenant liable for damage done by an ESA to the premises or to another person.
What documentation can I require for an emotional support animal in Montana?
Under MCA 70-24-114, if the disability-related need is not obvious you may request documentation from a health care practitioner showing the effective date, license number, and type of license, plus proof of licensure and vaccination. You may not ask for the diagnosis, the severity of the disability, or medical records. An online certificate or patch alone is not sufficient.
What is the 30-day rule for ESA letters in Montana?
MCA 70-24-114 requires that the health care practitioner who signs the supporting documentation have established a client-provider relationship with the tenant at least 30 days before providing it. A same-day online letter does not meet this standard, and you may treat documentation that fails it as insufficient.
Can I ask a tenant to prove their dog is a service animal?
No. For a service animal you may only ask whether the animal is required because of a disability and what work or task it performs. You cannot require certification, an ID, a vest, a demonstration, or medical proof. Emotional support animals are handled differently and follow the documentation rules in MCA 70-24-114.
When can a Montana landlord deny an assistance animal?
Only when the specific animal poses a direct threat to the safety or health of others, or a direct threat of physical damage to the property that cannot be reduced by another reasonable accommodation. The denial must be based on that individual animal's actual behavior or history, not on breed, size, or a blanket policy, and should be documented in writing.
Does Montana limit breed or size restrictions for ordinary pets?
No. For genuine pets, Montana has no statute barring breed, size, weight, or number limits, and you can ban pets entirely or charge pet deposits and pet rent through the lease. Those restrictions cannot be applied to qualified service animals or ESAs, which are exempt from pet policies.
Federal authority: 42 U.S.C. § 3604(f)(3)(B); 24 C.F.R. § 100.204; HUD FHEO Notice 2020-01. State authority: Mont. Code § 70-24-422. Last updated October 23, 2026. For informational purposes only, not legal advice. Pet and assistance-animal questions are highly fact-specific; consult a licensed Montana attorney before refusing any request.