Budget transparency and financial stability are essential for the sustainability of decentralized parish governments; however, incomplete information, dependence on state transfers, and limited financial autonomy remain significant challenges. The objective was to analyze the relationship between both variables through a quantitative, descriptive, correlational, and explanatory approach, using a non-experimental, longitudinal, and comparative design. Budget reports, accountability records, and documents issued by governmental, national, and international organizations were reviewed. Data were processed through descriptive statistics, principal component analysis, and panel data regression. The results showed a strong positive relationship between budget transparency and financial stability, with an approximate correlation of 0.81. Transparency had a positive and significant effect on financial stability, whereas dependence on transfers and the proportion of current expenditure produced negative effects. Investment participation had a favorable influence, although high budget execution alone did not guarantee better spending quality. Parish financial sustainability therefore requires accessible information, diversified funding sources, administrative coordination, and continuous assessment of institutional performance.