The aim of this article is to discuss the transcendental status of Kant's moral philosophy. Despite what is usually thought among scholars, we intend to demonstrate that morality for Kant is not part of transcendental philosophy. We shall at first recall the reasons that have driven Kant to separate morality from the transcendental philosophy. Kant's position seems both firm and clear: morality, although involving a priori concepts such as the moral law, is not a transcendantal knowledge because its major concept, the will, is not pure enough; it refers somehow to experience. On the other hand, after considering the positions of renowned scholars such as Gueroult, Delbos, and Höffe, who claim that Kant's morality became partially or totally transcendantal since the writing of the Grundlegung zur Metaphysik der Sitten, we suggest that Kant had then found the right way to establish on a critical basis a future metaphysics of morals.