We discuss an influence of the quantum electrodynamics corrections due to the initial state radiation in the structure function approach and factorizable electroweak  {O}(\alpha ) corrections in the pole approximation on the standard model predictions for top quark pair production and decay into six fermions at a linear e⁺e^- collider. The discussion is illustrated with numerical results for one selected six-fermion reaction {e⁺ e^-\rightarrow b \nu _\mu \mu ⁺ \bar {b} \mu ^-\bar {\nu }_\mu }.

PACS numbers: 12.15.Lk, 13.40.Ks, 14.65.Ha