A Rent Increase Notice is a document issued by a landlord to their tenant(s) to inform them of an upcoming rent increase. The notice will include details of when the increase will take effect, the amount of the increase, and the landlord's reasons for the increase. There are two types of Rent Increase Notices: a Fixed-Rate Increase Notice, which informs tenants of a fixed-rate increase in rent, and an Index-Linked Increase Notice, which informs tenants of an increase in rent linked to an index such as the Consumer Price Index. Both types of notices are legally required to be provided to tenants in advance of any increase in rent.