Sustainability reporting has become a pivotal tool for firms in industries and firms have faced significant scrutiny due to their environmental impact, necessitating the integration of environmental, social and governance considerations into financial decision-making. The goal of this study is to examine the influence of sustainability reporting on the economic performance of firms in Nigeria. Using the ex-post facto research design, data were extracted form 48 selected firms for 10 years and were analysed. The findings showed that sustainability reporting framework adoption has a slight negative and insignificant influence on return on assets, but insignificant positive influence on return on equity and net profit margin while sustainability reporting exercised statistically insignificant negative influence on return on assets, return on equity and net profit margin and the study concluded that sustainability reporting has not been significantly integrated into the annual financial reporting framework of most of the firms and that sustainability reporting does not significantly influence, return on assets (ROA), return on equity (ROE) and  net profit margin (NPM) performance of firms in Nigeria. Upon this, study therefore recommends that despite the mixed regression results, the positive correlations suggest that sustainability reporting may still offer reputational and long-term financial benefits and that firms should improve sustainability reporting to meet stakeholders expectations and potentially gain market advantages and that clearer guidelines on sustainability reporting and disclosure could improve comparability and reliability thus helping investors and analysts better assess sustainability performances.