The electronic structure of barium titanate is determined according to the extended Hückel tight-binding method using atomic data based on a self-consistent-field calculation. The effects of the phase transition on the partial density of states are studied. The electronic contribution to the phase stability of the compound is calculated from the total density of states. The tetragonal phase is found to be stable as compared to the cubic phase. The density of states is compared with available x-ray photoemission spectra and is found to be in agreement with some features in experimental results.