  The inflation within the MSSM is proposed, where the inflaton field is a
combination of the Higgs, squark and slepton states. While the inflationary
phase is fully governed by the electron Yukawa superpotential coupling, the
fields' condensates float along the flat $D$-term trajectory. This predicts the
MSSM parameter $\tan \beta \simeq 13.1$ determined via the value of the
curvature perturbation amplitude. The values of the scalar spectral index and
the tensor-to-scalar ratio are predicted to be $n_s\simeq 0.966$ and
$r=0.00118$. The postinflation reheating of the Universe proceeds by the
radiative decay of the inflaton to the two gluons ($\phi \to gg$) with the
reheating temperature $T_r\simeq 1.4\cdot 10^7$ GeV.
