The title compound is formed together with Li[Tsi-InI3] (the main product), (Tsi-In(Me)I)(2) and (Tsi)(2)InMe in very low yield in the reaction of InI3 with Tsi-Li (Tsi = -C(Si(CH3)(3))(3)) in toluene. According to the X-ray structure determination this compound crystallizes in the triclinic space group P1 and consists of slightly associated dimers of [Tsi-InI3](-) anions via weak (InI)-I-I...(-In-III) contact-bonds of 345.6(1) to 373.8(2) pm. Additionally the In-I atom is capped by a D-6-benzene molecule.