The novel title compound, [(CH(3))(4)N](2)[Ta(6)Br(12)(H(2)O)(6)]Br(4) x 2H(2)O, with a [Ta(6)Br(12)]2+ cluster unit, has been prepared and structurally characterized. The compound crystallizes in space group C2/c, with a twofold axis passing through the cluster and the centre of symmetry located between the clusters. The nearest neighbouring cluster units are aligned along the crystallographic c axis, forming a one-dimensional chain pattern.