  The effect of nonperturbative and higher order perturbative corrections to
all the free nucleon structure functions ($F_{iN}(x,Q^2); i=1-5$) in the DIS of
$\nu_\tau/{\bar\nu}_\tau$ on nucleon is studied.
  The target mass correction (TMC) and higher twist (HT) effects are
incorporated following the works of Kretzer et al. and Dasgupta et al.,
respectively.
  The evaluation of the nucleon structure functions has been performed by using
the MMHT 2014 parameterization of the parton distribution functions (PDFs). The
calculations have been performed at the next-to-leading(NLO) order.
  These nucleon structure functions (SF) are used to calculate the DIS cross
section by further including the kinematical corrections due to $\tau$-lepton
mass.
  Due to the inclusion of lepton mass two additional structure functions
$F_{4N}(x,Q^2)$ and $F_{5N}(x,Q^2)$ become non-negligible.
  The results for the nucleon structure functions, differential and total
scattering cross sections are presented. The various effects considered in this
work are effective in the different regions of $x$ and $Q^2$, and quite
important in the energy region of
  $E_{\nu_\tau/{\bar\nu}_\tau} < 15$ GeV. A comparative study of our results
with the existing
  results in the literature for the cross
  sections is made in the energy region of interest for the DUNE, SHiP, DsTau
  and HyperK experiments proposed to be done in the near future.
