The study looks at the impact of the internal business environment (as evaluated by financial competence, marketing competency, and management competency) on the success of SMEs in Adamawa State, Nigeria. The total population of the study was 1,776 people (Adamawa State Chamber of Commerce and Industry, Adamawa State, 2019), with a sample size of 239 people chosen using Yamane's (1967) method and convenience sampling strategy. Data collected using questionnaire was analyzedvia descriptive statistics, as well as correlation analysis and multiple regression technique. According to the study, financial aptitude, marketing ability, and managerial ability all have a positive and significant impact on the development of SMEs in Adamawa State. As a result, the study advises SMEs (entrepreneurs) and corporate leaders to re-vitalize their companies' financial capacity through smart financial planning.