In the anion of the title molecular salt, C(6)H(16)N(+)·C(6)H(4)O(5)S(-), the nitro group is twisted slightly from the benzene ring, making a dihedral angle of 3.16 (10)°. In the crystal structure, the cations and anions are linked into a two-dimensional network parallel to the ab plane by C-H⋯O and N-H⋯O hydrogen bonds.