  The role of the tensor part of the nuclear interaction is actively
investigated in recent years due to experimental advancement yielding new data
in nuclei far from the $\beta$-stability line. In this article we study the
effect of this part of the nuclear interaction on deformed neutron magic
numbers in the rare-earth region within the Skyrme energy-density functional
for various TIJ \cite{lesinski:2007} parametrizations. Two quantities signaling
magic numbers are considered: two-neutron separation energies and
single-particle energies. They are calculated in isotopic series involving
well-deformed rare-earth nuclei ranging from $Z=64$ to $Z=72$ in the $N=100$
region. Obtained results show that, whereas the neutron-proton tensor
contribution to binding energies is important to reproduce neutron sub-shell
closure at $N = 104$ in heavier rare earths Yb ($Z=70$) and Hf ($Z=72$)
isotopes, like-particle tensor also plays a role in the single-particle
spectrum around Fermi level and is even favored in lighter Gd ($Z=64$) and Dy
($Z=66$) rare-earth isotopes.
