In this work, we have theoretically investigated protonation induced polaron formation, a mechanism intensely discussed in the context of doping OSC materials with Lewis acids, in the widely used OSC PCPDT-BT as a representative example. On a microscopic level, we find that protonation of a conjugated chain with only one proton can induce formation of a typical polaronic state for which the induced positive charge is tied to the spatial position of the proton. We find that this polaron formation is hindered by the interaction with the BCF:OH -counter anion if it is still nearby. Also with chlorobenzene as a solvent, the formation of such proton-induced polaron state appears more difficult.