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Free Montana Lease
Extension Addendum Template

The agreement is signed by the same parties as the lease it attaches to.

Last reviewed September 2026

Written by LawLease Editorial

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Montana Lease Extension Addendum

This Lease Extension Addendum is built with Montana as the governing state. These are the Montana landlord-tenant rules that most often bear on it, with the statute for each.

Montana rules at a glance

Montana rules for a Lease Extension Addendum
Month-to-month termination30 days’ written notice (7 days for week-to-week)MCA §70-24-441
Rent-increase noticeNo specific statute; a month-to-month change needs the 30-day termination noticeMCA §70-24-441
Rent controlLocal governments may not control private rentsMCA §7-1-111
Rent increasesNo Montana statute sets a separate rent-increase notice period. Rent is locked for a fixed-term lease; for a month-to-month tenancy an increase is a change of terms, so the 30-day termination notice under §70-24-441(2) is the practical minimum.

Rent, late fees & rent increases

Montana has no statute capping residential late fees or requiring a grace period — a late charge is enforceable because the lease provides for it, and unpaid late charges are a permitted deduction from the deposit (§70-25-201(1)).

  • Rent increases — No Montana statute sets a separate rent-increase notice period. Rent is locked for a fixed-term lease; for a month-to-month tenancy an increase is a change of terms, so the 30-day termination notice under §70-24-441(2) is the practical minimum.
  • Rent control — Local governments in Montana are denied any power to control the amount of rent charged for private residential property (§7-1-111(26)).
  • Email can’t be required — A lease can’t make giving an email address a condition of renting, though the parties may voluntarily elect electronic notice (§70-24-202).

Montana Lease Extension Addendum FAQs

How much notice is required to end a month-to-month lease in Montana?

At least 30 days’ written notice, which can be given at any time during the month; the tenancy ends on the date named, with rent apportioned daily. Week-to-week tenancies need 7 days (§70-24-441).

More Montana landlord documents

Lease Extension Addendum in other states

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