Abstract We have determined the magnetic structures of the Tb and Fe sublattices in TbFe 6 Sn 4 Ge 2 by combining powder neutron diffraction with Fe 57 and Sn 119 Mössbauer spectroscopy. TbFe 6 Sn 4 Ge 2 adopts the hexagonal HfFe 6 Ge 6-type ( P 6 / m m m ) crystal structure. The Fe sublattice orders antiferromagnetically below T N = 518 ( 3 ) K, with the moments parallel to c. At T t = 42 ( 1 ) K, the Tb sublattice orders helimagnetically, with a propagation vector Q = ( 0 , 0 , 0.0963 ) r.l.u. (at 2 K). This imposes helimagnetic order (with an identical propagation vector) on the Fe sublattice, indicating that the two sublattices are coupled for T < T t . The canting angle of the Fe moments from the c-axis in the helimagnetic structure is 10(1) ° .