Missouri has no statute setting an advance-notice period for rent increases and no rent control. For a month-to-month tenancy, a landlord effectively raises rent by terminating the existing term with one month's written notice under RSMo 441.060 and offering new terms. Mid-lease increases are barred by the lease itself.
No Missouri statute caps rent or mandates a specific rent-increase notice. Because Missouri has no rent-control law, a landlord may raise rent to any amount between fixed-term leases or, for a periodic tenancy, by ending the current arrangement. RSMo 441.060 requires "one month's notice, in writing" to terminate a month-to-month tenancy, so an increase that changes the terms is practically delivered with that same one-month notice tied to a rent-paying date. During a signed fixed-term lease, rent cannot be increased unless the lease expressly permits it. There is no statutory ceiling, frequency limit, or registration requirement governing the size of an increase.
No specific statutory penalty. An increase imposed without proper termination notice, or mid-lease without contractual authority, is simply unenforceable as a breach of the lease or periodic-tenancy rules.
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