This first-of-its-kind analysis shows that in addition to thwarting rehabilitation and failing to improve public safety, criminal-court fees and fines also fail at efficiently raising revenue. The high costs of collection and enforcement are excluded from most assessments, meaning that actual revenues from fees and fines are far lower than what legislators expect. And because fees and fines are typically imposed without regard to a defendant’s ability to pay, jurisdictions have billions of dollars in unpaid court debt on the books that they are unlikely to ever collect. This debt hangs over the heads of defendants and grows every year.