The study aims to identify the effect of environmental sustainability accounting (ESA) on competitive advantage (CA), and the effect of ESA on making decisions (funding, investment, and strategic) in Sudanese banking. A questionnaire was used to collect data from 135 accountants and managers of Sudanese banking. A descriptive method was used to confirm that the study's goals had been met. The questionnaire data is analyzed, and hypotheses are tested, using the Smart pls application. The study found a positive relationship between ESA and CA in the Sudanese banking sector. Additionally, ESA has a positive relationship with funding, investment, and strategic decisions in the Sudanese banking sector. Based on these findings, future research can help accountants comprehend the intricacies of ESA according to national and cultural conditions, especially in developing countries. Also, larger sample sizes may be used in future research on this topic, particularly if it is studied internationally.