The first part of this paper surveys five perspectives in Kant’s philosophy on the quantity of retribution to be inflicted on wrongdoers, ordered by two dimensions of difference – whether they are theoretical or practical perspectives, and the quantity of retribution they prescribe: (1) theoretical zero, the perspective of theoretical philosophy; (2) practical infinity, the perspective of God and conscience; (3) practical equality, the perspective of punishment in public law; (4) practical degrees, the perspective we adopt in private relations to (...) others and (5) practical zero, a perspective I argue is entailed by Kant’s doctrine of strict right, which is his justification of coercing compliance with public law. Kant acknowledges 1–4 but not 5. The second part draws on Kant’s account of the burden of proof in criminal law to argue that Kant is wrong to adopt 3 in responding to criminals, and that we ought to adopt 5 instead. (shrink)