Montana Rent Increase 2026: 15-Day Month-to-Month Rule & 60-Day Voucher Notice
Montana's 15-day rule is specifically for month-to-month lease changes. Housing Choice Voucher rent increases use a separate 60-day program notice after the first year. Learn the timing, fixed-term lease distinction, local rent-control preemption, and what to verify before serving a notice.
The short answer
Montana Code Annotated § 70-26-109 gives landlords a specific way to change the terms of a month-to-month lease. The landlord may give written notice at least 15 days before the expiration of the month, with the new terms—including rent—taking effect when that month expires if the tenant continues to occupy the premises.
That 15-day rule is not a universal deadline for every Montana rental. A fixed-term lease, a federally assisted tenancy, or another specialized housing arrangement can require a different analysis. Max Rental Tools therefore keeps automated Montana notice timing review-gated until the tenancy and program context are confirmed.
How Montana's 15-day month-to-month rule works
Section 70-26-109 is written expressly for leases from month to month. It allows the landlord to change lease terms by giving written notice at least 15 days before the expiration of the month. The change takes effect at the expiration of that month, and if the tenant remains afterward the notice establishes the new lease terms, rent, and conditions described in the notice.
The wording matters because it ties the notice to the expiration of the monthly period rather than simply saying that any rent increase becomes valid 15 elapsed days after delivery. Record the rent period, notice date, and intended effective date before relying on the statute.
A fixed-term lease needs a separate lease review
The 15-day mechanism in § 70-26-109 is limited by its own text to month-to-month leases. It should not be treated as automatic authority to rewrite rent during a fixed term. Montana's Residential Landlord and Tenant Act separately recognizes that a rental agreement may set the rent, the term of the agreement, and other lawful conditions.
For a fixed-term tenancy, review the signed lease, expiration date, renewal language, and any lawful rent-adjustment provision before selecting an effective date. If a higher rent is being offered for a later term, a Lease Renewal Notice may help organize that offer, but the lease and applicable law still control.
Montana does not use a general statewide percentage ceiling for ordinary private rent in this framework
The current statewide framework reviewed for ordinary private rentals does not supply a general percentage formula such as a 5% or 10% statewide cap. Montana also restricts local rent regulation: § 7-1-111(26) prohibits a local government with self-government powers from controlling the amount of rent charged for private residential or commercial property.
The statute contains an important carveout in its definition of private residential property: it does not include property in which the local government has a property interest or an interest through a housing authority. Public, subsidized, or program-regulated housing should therefore be checked under the applicable program rules rather than treated as an ordinary private-market rental.
Housing Choice Voucher rent increases use a separate 60-day program rule
Montana Department of Commerce administers the statewide Housing Choice Voucher program and publishes a separate landlord process. The initial lease must be 12 months. After that initial term, the family may remain month to month, and a participating landlord seeking a rent increase must provide 60 days' notice to both the family and the Montana Department of Commerce.
That 60-day requirement is a Housing Choice Voucher program rule, not a replacement for the private-market 15-day month-to-month statute. Voucher rent also remains subject to program requirements such as rent reasonableness and the Housing Assistance Payment contract. Do not generalize either notice period across both systems.
Example: private month-to-month tenancy versus voucher-assisted tenancy
For an ordinary private month-to-month rental, suppose the monthly period expires at the end of October. Section 70-26-109 requires written notice at least 15 days before that monthly expiration if the landlord wants the changed terms to take effect when October ends. The actual service date and rental period should be documented rather than relying on a generic calendar shortcut.
Now change the facts: the same unit participates in Montana's Housing Choice Voucher program and the initial 12-month lease has ended. The Commerce program requires 60 days' notice to both the family and Commerce for a requested rent increase. This difference is why the property/program context must be known before a notice deadline is generated.
What landlords, tenants, and property managers should verify
Confirm whether the tenancy is truly month to month or still within a fixed term; identify the monthly expiration date; review the signed rental agreement; record the current and proposed rent; confirm the notice delivery date and proposed effective date; and identify any subsidy, housing-authority, or other program involvement.
For Housing Choice Voucher units, also confirm the initial 12-month term has passed and follow Montana Department of Commerce procedures for the rent request. For other specialized housing arrangements, use the governing statute, lease, and program materials instead of assuming the ordinary private-market rule applies.
Use Max Rental Tools after confirming the Montana tenancy type
Start with the Montana state guide and rent-increase calculator to measure the proposed percentage change and organize the tenancy facts. Because Montana's verified 15-day rule is specifically month to month and the voucher program uses a separate 60-day process, Max Rental Tools intentionally does not convert Montana into one universal automated notice-day answer.
After confirming the correct path, use the Rent Increase Notice for a supported rent-change workflow, the Lease Renewal Notice for a proposed new term, the Month-to-Month Rental Agreement when the parties need to document a periodic tenancy, or the Rent Ledger when payment history matters. The Montana Legislature and Department of Commerce sources below remain the controlling public references for the rules summarized here.
Common questions
How much notice is required for a Montana month-to-month rent increase?
Montana Code § 70-26-109 permits a landlord to change month-to-month lease terms, including rent, by written notice at least 15 days before the expiration of the month, with the change taking effect at that expiration.
Is every Montana rent increase a 15-day notice?
No. Section 70-26-109 is written specifically for month-to-month leases. Fixed-term leases and assisted-housing programs require separate review.
Does Montana have a statewide percentage rent cap for ordinary private rentals?
The statewide framework reviewed does not establish a general percentage ceiling for ordinary private-market rent increases. Montana also restricts local governments from controlling private rent amounts under § 7-1-111(26), subject to the statute's government-property and housing-authority carveout.
How much notice is required for a Montana Housing Choice Voucher rent increase?
Montana Department of Commerce states that after the initial 12-month lease, a participating landlord seeking a rent increase must give 60 days' notice to both the family and Commerce.
Can a landlord use the Montana 15-day rule to raise rent during a fixed-term lease?
The 15-day mechanism in § 70-26-109 applies to month-to-month leases. A fixed-term lease should be reviewed for its rent, term, renewal language, and any lawful adjustment provision before a change is planned.
Can a Montana city create ordinary private rent control?
Section 7-1-111(26) prohibits a local government with self-government powers from controlling rent charged for private residential or commercial property, while excluding specified local-government and housing-authority property interests from the private-residential definition.
Official sources
Montana Code Annotated — § 70-26-109 Change of Lease Terms by NoticeMontana Code Annotated — § 70-24-201 Rental Agreement Terms and ConditionsMontana Code Annotated — § 7-1-111 Powers DeniedMontana Department of Commerce — Housing Choice Voucher LandlordsMontana Department of Justice — Tenants and LandlordsContinue your check
Use the state directory for current jurisdiction-specific rules, calculate the proposed increase, then prepare the appropriate rental document only after the legal-rule checks are complete.