Isothermal vapor-liquid equilibrium data for the system methanol + toluene + tetrabutyl ammonium tetraphenylborate at four salt molalities, (0.100, 0.200, 0.300, and 0.500) mol center dot kg(-1), have been measured with the help of headspace gas chromatography at 318.15 K. The experimental data were correlated using the electrolyte nonrandom two-liquid model.