Summary: ``We illustrate the dynamical instability of charged spherical fluid configuration with anisotropic conditions in nonminimally coupled $f(R,T)$ theory of gravitation, where $R$ is the Ricci scalar and $T$ is the trace of the energy momentum-tensor. We investigate both modified field equations and continuity equations to provide some extra degrees of freedom under the constraints of a specific considered form of $f(R,T)$ gravity. We examine how small changes in geometric and material profiles affect the fluid's collapsing structure via a perturbation scheme. We study the unstable eras using Newtonian $(\Bbb N)$ and post-Newtonian (pN) approximations by applying some significant constraints on the collapse equation. Our findings demonstrate that the stiffness parameter $\Gamma$ has a substantial influence on the identification of unstable phases for our charged stellar geometry. We conclude that some correction terms that are dark source terms, which appear due to $f(R,T)$ gravity, lead to an unstable structure/phase throughout the evolutionary process.''