The title mol-ecule, C8H12NO5PS2, exhibits a crystallographic mirror plane that is perpendicular to the ring and bis-ects the sulfamoyl and thio-phosphate ester groups. In the crystal, mol-ecules are linked by N-H⋯O hydrogen-bonding inter-actions reminiscent of carb-oxy-lic acid hydrogen bonding pairs, forming chains parallel to the b-axis direction.