Agricultural finance policy in South Sudan has repeatedly recognised the need to transform agriculture from subsistence production into a more productive, market-oriented and food-secure sector. Yet rural farmers in Eastern Equatoria, Jonglei and Lakes State continue to operate within a financial reality shaped by absent bank branches, limited collateral, short lending cycles, conflict-affected infrastructure, weak policy coordination and reliance on Community Group Saving and Lending (CGSL) mechanisms. This article maps the gap between national strategy and rural financial reality by re-analysing mixed-methods doctoral evidence collected between 2022 and 2025 among farmers, fishermen/women and pastoralists in three South Sudanese states. The quantitative component used 81 valid questionnaires from a target sample of 85, while the qualitative component used 17 interviews to interpret the institutional meaning of savings groups, lending constraints and farmer investment decisions. The findings show that CGSLs are widely perceived as accessible, member-managed and socially legitimate rural financial institutions. Respondents strongly agreed that government and donors should collaborate to offer financial services (overall mean = 4.41), that saving and loan groups are an alternative for the poor (overall mean = 4.32), and that rural finance can make a difference in agricultural productivity (overall mean = 4.58). At the same time, farmers reported a continuing gap in long-term investment capital, weak formal banking outreach, and heavy dependence on informal and NGO-supported mechanisms. Chi-square tests indicated a significant association between CGSL participation and productivity-related indicators (chi-square = 15.92, p = 0.0001), while logistic regression showed that access to CGSL credit significantly influenced farmers' decisions to invest in modern agricultural technologies (beta = 1.9459, p = 0.026). The article argues that South Sudan's agricultural finance challenge is not only a shortage of policy ambition but a failure of institutional translation: national strategies identify the need for agricultural transformation, yet rural financial systems remain too thin, short-term and fragmented to support that transformation. The study recommends a phased rural finance policy architecture that links CGSLs, cooperatives, mobile-capable records, extension services, input suppliers, agricultural insurance and formal financial institutions through a locally governed, risk-aware and long-term financing framework.