We present an overview of the loop corrections to the mass difference
Delta m(Bd0)/m(Bd0) within the minimal supersymmetric standard model.
We include the complete mixing matrices of the charginos and neutralin
os as well as of the scalar partners of the left and right handed thir
d generation quarks. We show that the SUSY contribution to the mass di
fference in the B-d(0) system is comparable to the Standard Model one
and can be even larger for the charged Higgs contribution and for a ce
rtain supersymmetric parameter space.