  We address the impact of sterile fermions on charged lepton electric dipole
moments. We show that in order to have a non-vanishing contribution to electric
dipole moments, the minimal extension necessitates the addition of at least two
sterile fermion states. Sterile neutrinos can give significant contributions to
the charged lepton electric dipole moments if the masses of the non-degenerate
sterile states are both above the electroweak scale. In addition, the Majorana
nature of neutrinos is also important. Furthermore, we apply the computations
of the electric dipole moments for the most minimal realisation of the Inverse
Seesaw mechanism, in which the Standard Model is extended by two right-handed
neutrinos and two sterile fermion states. We show that the two pairs of (heavy)
pseudo-Dirac mass eigenstates can give significant contributions to the
electron electric dipole moment, lying close to future experimental
sensitivity. We further discuss the possibility of beyond the minimal Inverse
Seesaw models and of having a successful leptogenesis in this framework.
