The synthesis, structure and Sn-119 NMR spectrum of the title compound, (C4H12N) [Sn(C7H5OS)(3)], are reported. Crystallographic threefold symmetry is present in both the anion and cation, In the [Sn(SOCPh)(3)](-) anion, the Sn-II coordination geometry is triangular pyramidal, with the S atoms forming the basal plane and the Sn atom at the apex; the Sn-S distance is 2.592 (2) Angstrom. In addition, weak intramolecular interactions occur between the Sn atom and the carbonyl O atoms [Sn ... O 2.967 (2) Angstrom]. The Sn-119 NMR chemical shift of the title compound is -227 p.p.m. (MeCN, 295 K).