This study aimed to examine the effects of capital structure on the financial performance of Ethiopian commercial banks. The dependent variable, financial performance, is measured by Return on Assets (ROA), while factors such as loan-to-deposit ratio (LDR), asset-to-total equity ratio (ATER), total deposit-to-total asset ratio (TDTAR), capital adequacy ratio (CAD), and asset growth ratio (GA) were used as proxy independent variables to gauge capital structure. Using a quantitative approach and an explanatory research design, this study analyzes 6 years of audited financial reports from 14 commercial banks in Ethiopia. This investigation employs a random effect regression model and Stata 14 software package to explore the relationships among these variables. The result revealed that both the loan-to-deposit ratio and the total deposit-to-total asset ratio have a positive and significant impact on financial performance, while the asset growth ratio showed a negative effect. Based on these findings, this study recommends that bank authorities concentrate on bolstering their deposit base, managing asset growth efficiently, maintaining adequate capital levels, and optimizing leverage levels to improve financial performance and ensure long-term sustainability in the banking sector. Additionally, this research is anticipated to inform policymakers about regulatory frameworks for banks and assist banking managers in formulating effective capital financing strategies within the Ethiopian commercial banking sector, thus enriching the existing literature on the relationship between capital structure and financial performance.

This study examines the drivers of net interest margin (NIM) in developing economies, with a particular emphasis on Ethiopian commercial banks. It adopts an explanatory research design, analyzing quantitative data from the audited financial statements of 13 banks over 13 years (2012–2024), totaling 169 observations. Both Driscoll–Kraay fixed- and random-effects standard errors were computed in RStudio (version 4.5). The primary analysis relied on Driscoll–Kraay random regression outcomes, though fixed regression results were included for robustness checks. Findings indicate that the loan-to-deposit ratio, bank size, capital adequacy, and foreign direct investment (FDI) inflows have a significant positive impact on NIM, underscoring their role in enhancing profitability and stability. Conversely, inflation significantly reduces margins, while no substantial effects were observed for operational efficiency or GDP. These insights suggest that Ethiopian banks should focus on asset growth, maintaining strong capital reserves, increasing the loan-to-deposit ratio, and attracting FDI. Policymakers are encouraged to stabilize inflation and create a conducive environment to FDI to support sectoral growth. Future research could investigate operational efficiency alongside industry-specific indexes, such as the Herfindahl–Hirschman index for loans, assets, and income, to better understand variations in NIM.