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The anions of the title salt, NH4+·HO2CC6H4–O–C6H4CO2−, are linked by intermolecular –CO2H...O2C– hydrogen bonds, forming a polyanionic chain in the crystal; adjacent chains are connected through the ammonium cation into a layer structure, with the ammonium cation serving as hydrogen-bond donor to four carboxylate O atoms. The cation and anion both lie on special positions of 2 site symmetry. In the anion, the rings make a dihedral angle of 65.3 (1)°. The acid H atom is disordered about the special position.