K.L. Reinhold’s interpretation of deduction plays a seminal role in the development of German Idealism. However, as yet Reinhold’s concept of deduction has not been sufficiently explained. The goals of this paper are to analyze Reinhold’s notion of deduction in his Neue Darstellung der Hauptmomente der Elementarphilosophie, to reconstruct his deduction of a priori forms of representation and to discuss his deduction critically. In doing so, I will present Reinhold’s objections against Immanuel Kant’s method in the Critique of Pure Reason.