Against the view of some contemporary Kantians who wish to downplay Kant's retributivist commitments, I argue that Kant's theory of practical of reason implies a retributive conception of punishment. I trace this view to Kant's distinction between morality and well-being and his attempt to synthesize these two concerns in the idea of the highest good. Well-being is morally valuable only insofar as it is proportional to virtue, and the suffering inflicted on wrongdoers as punishment for wrongdoing is morally good so (...) long as it is proportional to the wrongdoing. According to Kantian retributivism, punishment is warranted as a means to promote proportionality between well-being and virtue. (shrink)