The article reconstructs three layers of a social concept that can be found in Immanuel Kant’s practical philosophy without using its anthropology and history texts. To this end, the notions of human coexistence (natural law) and universal reciprocal coercion (civil law) described in its Metaphysics of customs are specified in order to indicate that they do not refer to a society but to the form of one. Subsequently, some co-ordinates of the ‘ethical community’ present in the religion... are reconstructed to argue, on the one hand, that a society as such can be referred to here and, on the other, that it can form a bridge between the form of legal society and the ethical training of individuals, i.e. between the external use of freedom and its internal use, the socialisation of moral maxima (b) and the opening up of an intrinsic normality.