In the cation of the title salt, C(28)H(27)O(3)S(+)·CF(3)O(3)S(-), the dihedral angle between the naphthalene ring system and the -C(=O)-O- plane is 80.39 (9)°. The three methyl groups of the tert-butyl group are each disordered over two orientations with an occupancy ratio of 0.712 (18):0.288 (18).