This study investigates how Confucian ethics—a virtue-based moral tradition emphasizing integrity (Xin), self-discipline, and commitment fulfillment—influences personal credit behavior. We conceptualize loan repayment as ethical choices involving promise-keeping rather than purely economic calculations, and theorize that Confucian culture cultivates moral character through three mechanisms: financial prudence (Zhi), self-discipline (Ke-ji), and social embeddedness (Ren). Analyzing over 4 million consumption loans from China’s consumer finance market and employing geographic measures based on historical temple distributions, we find that Confucian cultural exposure is associated with significantly lower loan delinquency. This relationship remains robust across alternative specifications and instrumental variable analyses. Mechanism analyses confirm that financial prudence, self-discipline, and social embeddedness mediate the culture-credit relationship. Heterogeneity analyses reveal stronger effects among individuals with lower education, males, older cohorts, and those in regions with weaker formal credit institutions. Supplementary analysis rules out credit avoidance as an alternative explanation. This study contributes to business ethics by demonstrating that cultural moral traditions function as informal ethical governance mechanisms, illuminating the complementary relationship between informal cultural institutions and formal regulatory structures.