  The electronic properties as well as the structural characteristics and their
pressure dependence of the semi-metallic $B10$-structured compound
$\mathrm{InBi}$ were investigated. It is found that the structural values of
$\mathrm{InBi}$ calculated in the first-principles calculations reproduce the
experimental values worse than those for other heavy III-V pnictides, which are
characterized by cubic $B3$ and $B2$ structures, as well as for IV-VI compounds
$\mathrm{SnO}$ and $\mathrm{PbO}$ having the same $B10$ structure. The low
accuracy of the first-principles calculations is a consequence of the
peculiarities of the band structure inherent to $\mathrm{InBi}$ and not
observed in all the other above-mentioned compounds. To improve the agreement
with the experiment, it is proposed to take into account the distortion of the
compensated half-metal condition at the highly symmetric points of the
Brillouin zone, where the electronic and hole pockets are located.
