No, if there is a written lease for a specific term (such as a one-year lease), rent may not be increased until the end of the term unless the lease itself provides for increases--and then, it can only be increased as permitted by the lease. If there is an oral lease or a written month-to-month lease, rent can only be increased on a month's notice. A landlord may only take out those amounts authorized by the lease, and so cannot increase the rent or take out extra without notice or during the middle of a lease term.