Can a Texas 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 Texas landlord can technically issue multiple rent increases in one year, each with the proper notice (Texas has no statewide statutory advance notice for rent increases. Lease terms govern. Default practice is 30 days written notice on a month-to-month tenancy, matching the Tex. Prop. Code 91.001 termination rule. No state rent cap, and local rent control is preempted.). 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: Lease-based; Tex. Prop. Code 91.001 (30-day month-to-month termination default)