A substrate can include a thin film transistor for a touch display, which is capable of preventing oxidation of a touch connection electrode. In the substrate including a thin film transistor, an inorganic insulation film for covering a side surface of a planarization film, which exposes a touch sensing line, is formed of a material different from that of the planarization film, and a touch connection electrode is located on a side surface of the inorganic insulation film.