The study presents numerical investigations on hydrodynamic quality of high-speed planing hull with spray rails and interceptor. Interceptors are blades which extend vertically downwards at the bottom near transom. The pressure distribution is the main cause for reduction in trim of the vessel. The interceptor has an effect on vessel resistance reduction which further result in more desirable trim control. The hull model was analysed with interceptor at different heights based on Finite Volume method using dynamic mesh. The two degrees-of-freedom considered is heave and pitch. The model tests are performed in the current towing tank facility available in the Department of Ocean Engineering, Indian Institute of Technology, Madras for the planing hull with and without interceptor in calm water. The height of interceptor plays an important role on the vessel performance. The study shows better trim reduction with consequent decrease in total resistance of vessel in planing regime.