[header] How to notify a tenant in writing of an increase [title] Know the law for your particular state or region. [step] There are numerous factors in place that could determine when, if, and how much you can increase the rent on your tenant. Knowing these rules and regulations is essential to ensure you are acting legally. 
[substeps] If your tenant signed a lease, you cannot raise the rent until the lease term is up, unless the lease states that a rent increase is allowed. For month-to-month tenants, a rent increase can occur after the proper notice period, which is often 30 days, but varies state to state.