The asymmetric unit of the title compound, C(14)H(13)O(2)PS(2), contains two crystallographically independent mol-ecules, which differ in the conformation of the 1,3,2-benzoxathia-phosphinine moieties (screw boat in the first mol-ecule and envelope in the second mol-ecule). In the crystal, neither classical nor non-classical hydrogen bonds are found. Weak inter-actions (about 2.9-3.0 Å) between the lone pair of the terminal S atoms with H atoms occur. This compound was further characterized by (1)H NMR and IR spectroscopy.