Can a North Carolina landlord raise rent more than once a year?

It depends on the tenancy type and any applicable rent control. On a month-to-month tenancy, a North Carolina landlord can technically issue multiple rent increases in one year, each with the proper notice (North Carolina has no statewide advance notice specific to rent increases. NCGS 42-14 sets 1-month notice for year-to-year termination; 30-day month-to-month notice is the default practice for rent changes. No state rent cap.). However, in jurisdictions with rent caps (California's AB 1482, Washington's HB 1217, New York's Good Cause coverage), the annual cap applies regardless of how many increase notices are issued. So even if a landlord delivers two increase notices in 12 months, the combined increase cannot exceed the statutory annual cap. On a fixed-term lease, no increase is permitted during the term unless the lease itself authorizes it, regardless of state. After the term ends, the landlord can issue an increase as part of the renewal offer.

Source: NCGS 42-14 (30-day month-to-month termination default)