  The supersymmetric decays of the top quark into charged Higgs plus bottom,
$\thb$, and into the supersymmetric partner of the top (${\wti u}_1$) plus the
lightest neutralino (${\wti \chi}_1^0$), $\tstopneu$, are discussed within the
framework of the Minimal Supersymmetric Standard Model with radiatively induced
breaking of the gauge group $SU(2)\times U(1)$. The possibility of detecting
these decays at present, i.e. given the available bounds on supersymmetric
parameters, is compared with the situation a Next $e^+e^-$ Linear Collider
would face if supersymmetric particles were still undiscovered at LEP~II. The
indirect implications for $\thb$ and $\tstopneu$ of a measurement of the bottom
quark decay $\bsgamma$ at the Standard Model level are taken into account. }}
