The molecular structure of the title salt, C6H16N+·C20H11N6O12S−, shows a planar geometry of the benzamido–phenyl–sulfonyl moiety, with a dihedral angle of 1.59 (9)° between the aromatic ring planes. The central ring and the aromatic ring of the other dinitrobenzamide group are nearly perpendicular, making a dihedral angle of 89.55 (9)°. All nitro groups lie almost in plane with the associated aromatic rings, the O—N—C—C torsion angles ranging from 9.2 (2) to 24.3 (2)°. In the crystal, strong anion–anion N—H⋯O and anion–cation hydrogen bonds form inversion dimers stacked along the a axis. Less prominent anion–anion C—H⋯O interactions lead to the formation of a three-dimensional network including anion–anion dimers as well as anion–anion chains along [100?].