Rent Increases for Different Types of Tenancies Most tenants in Oregon have month-to-month rental agreements. In this type of tenancy, tenants pay rent once a month and the rental agreement continues until either the tenant or the landlord decides to end it. In a month-to-month tenancy, rent cannot be increased during the first year after the tenancy begins. At any time after the first year of tenancy, rent can be increased only with a written notice delivered to the tenant