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In the crystal structure of the title molecular salt, C6H9N2O2S+·H2PO4−, the sulfomylalinium cations and the dihydrogen phosphate anions form independent [100] chains through Ns—H...O (s = sulfamoyl) and O—H...O hydrogen bonds, respectively. The chains are cross-linked by Na—H...O (a = amine) hydrogen bonds, generating (010) sheets. Two C—H...O hydrogen bonds involving diametrically opposite C atoms in the benzene ring of the cation as donors form chains parallel to [202] in which P=O and P—OH groups are acceptors. Together, these interactions lead to a three-dimensional network.