  Results of a simulation of Bhabha small-angle scattering process at
center-of-mass energy of 240~GeV and at the $Z$-boson resonance using the Monte
Carlo generator {\tt{ReneSANCe}} are presented. For the given accuracy about
$10^{-4}$ in estimating luminosity of future electron-positron accelerators,
the minimum cutoff angle for simulated events is established.
