The five-coordinate Sn atom in the title compound, [Sn(C(6)H(5))(3)(C(8)H(6)NO(4))(CH(3)OH)], exists in a trans-C(3)SnO(2) trigonal-bipyramidal coordination polyhedron of which the O atoms of the methanol mol-ecule and carboxyl-ate group occupy the apical sites. In the crystal, adjacent mol-ecules are linked by inter-molecular O-H⋯O inter-actions, generating a helical hydrogen-bonded chain running along the b axis.