The kinetics of heterogeneous electron transfer across films of electronically conducting nickel-4,4’,4",4"’-tetraaminophthalocyanine polymer (poly(NiTAPc)) are reported. Poly(NiTAPc), which is formed by oxidative electropolymerization of NiTAPc, acts as an n-doped electronic conductor between about 0.8 and - 2.0 V vs. Ag/AgCl. Within this range it sustains diffusion-limited charge transfer to one-electron bulk solution reactants at their anticipated formal potentials. However, the rates of heterogeneous electron transfer to these species are diminished by a small, uniform amount that is exponentially dependent on film thickness. Results are interpreted in terms of a porous electrode model in which electron transfer occurs at the polymer-solution interface, a large bulk capacitance arises from an interior pore volume that is inaccessible to diffusing reactants and a resistive element (suggested to be pores of electrolyte trapped between aggregrates of the polymer) is present which acts to reduce apparent values of k(s,h). It is demonstrated that electronically conducting polymer films do not accelerate the rate of electron transfer to solution reactants but rather restore kinetics to their anticipated values by preventing suface involvement.