  Offshell contributions to the electromagnetic nuclear current are evaluated
within a nonrelativistic approach by incorporation one-pion loop contributions
in time-ordered perturbation theory. By construction, the correct experimental
onshell properties of the nucleon current are ensured so that only the genuine
offshell effects appear as model dependent. For a qualitative assessment of
such offshell effects, this model is applied to photodisintegration of the
deuteron for photon energies up to 500 MeV. While at low energies offshell
contributions are small, above 300 MeV they lead to sizeable effects in
observables up to about 30 percent pointing to the necessity of incorporating
such effects if one aims at theoretical predictions of high precision.
