The Transition State Theory (TST) is the most widely adopted model in the kinetics of chemical reactions [2], . However, its original formulation only considers configurations of positions and momenta of the nuclei of reactants. The TST trusts that the electrons behave accordingly, without considering possible barriers between its configurations. However, molecule orbital theory demands that the electron configuration differs between the reactant and product. I will show that the nature of such transition is irrelevant and has no effect on how chemical reaction kinetics can be described. The original motivation stems from electrochemical kinetics where it has been conjectured the TST must be modified as it would not consider electron tunneling events . I will show that the TST remains valid in any case and no amendments to the theory are necessary even when considering electron transfers through quantum tunneling.