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In the title molecular salt, C6H10N3O+·C7H5O3−, the cation is protonated at the N atom lying between the amine and methyl substituents and the dihedral angle between the carboxyl group and its attached ring in the anion is 4.0 (2)°. The anion features an intramolecular O—H...O hydrogen bond, which closes an S(6) ring. The cation and anion are linked by two N—H...O hydrogen bonds [R22(8) motif] to generate an ion pair in which the dihedral angle between the aromatic rings is 8.34 (9)°. Crystal symmetry relates two ion pairs bridged by further N—H...O hydrogen bonds into a tetrameric DDAA array. The tetramers are linked by pairs of C—H...O hydrogen bonds to generate [100] chains. Hirshfeld surface and fingerprint plot analyses are presented.