In the anion of the title compound, C(7)H(10)N(+)·C(9)H(3)Br(4)O(4) (-)·CH(3)O, the dihedral angles formed by the benzene ring and the mean planes of the carboxyl-ate and meth-oxy-carbonyl groups are 74.8 (5) and 75.0 (5)°, respectively. In the crystal, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds link the components into chains along [100]. Additional stabilization is provided by weak inter-molecular C-H⋯O hydrogen bonds.