  Using \textit{ab initio} calculation, we investigate systematically the
structural and electronic properties of Ni$_{2}$Nb$_{1+x}$Sn$_{1-x}$ ($x$ = 0,
0.25, 0.50). Here, projector augmented wave approach (PAW) implemented in the
Vienna \textit{ab initio} simulation package (VASP) within generalized gradient
approximation (GGA) for the exchange-correlation functional has been used. In
this article, it is reported that though Ni$_{2}$NbSn and
Ni$_{2}$Nb$_{1.25}$Sn$_{0.75}$ have no structural transformation,
Ni$_{2}$Nb$_{1.5}$Sn$_{0.5}$ can transform to tetragonal structure from cubic
L2$_{1}$ phase. The cubic lattice parameter decreases with Nb doping at Sn
sites in off-stoichiometric alloys. The alloys are in paramagnetic phase in all
the structures. The hybridization between Ni and Nb 3d states triggers the
tetragonal distortion. Due to Nb doping in cubic L2$_{1}$ phase, there is a
significant change in total density of states (DOSs) at Fermi energy (E$_{F}$)
(N(E$_{F}$)). N(E$_{F}$) increases with increasing Nb doping. But, N(E$_{F}$)
decreases during structural transformation of Ni$_{2}$Nb$_{1.5}$Sn$_{0.5}$. The
superconducting critical temperature (T$_{C}$) also changes with Nb doping in
cubic phase and tetragonal distortion because T$_{C}$ very much depends on
N(E$_{F}$).
