Hidden fees can distort consumer decision-making. In response, regulators historically have (a) improved disclosure to make fees more salient or (b) standardized products to restrict what fees can be charged. We use Chilean administrative data and a multi-stage natural experiment to separately identify the effects of disclosure and standardization on repayment. We find that disclosure reduces delinquencies by 13.7 percentage points (40%) and default by 1.68 percentage points (98%), whereas standardization has no effect. We find no effect on initial loan terms, suggesting that disclosure’s effects are specific to repayment behavior: specifically, disclosure improves borrowers’ understanding of their credit obligations.