Vinya, LynnNzuki, David2026-01-072026-01-072025-11-28Vinya, L., & Nzuki, D. (2025). Management Information Systems Capabilities and Performance in Tier 1 Commercial Banks in Nairobi City County, Kenya. Journal of Accounting and Finance Research, 2(2). https://doi.org/10.5281/zenodo.177422820110-5159https://ir-library.ku.ac.ke/handle/123456789/32000Research ArticlePurpose: The study aimed to examine how user input and customization, resource availability, MIS system security, and ICT organization influence the performance of Management Information Systems (MIS) in tier-1 commercial banks operating in Nairobi City County, Kenya. The research sought to determine how strengthening MIS capabilities can enhance decisionmaking, operational efficiency, and overall bank performance. Methodology: A descriptive research design was employed, targeting 15 tier-1 commercial banks in Nairobi. From each bank, three key personnel—including department heads, IT directors, CIOs, IT managers, and MIS specialists—were selected, giving a total sample of 45 respondents. Primary data were collected using structured questionnaires. Both descriptive and inferential statistical methods were applied in analyzing the data. Findings: The results demonstrated that user satisfaction, effective system customization, adequate ICT resources, strong MIS security mechanisms, and wellorganized ICT structures significantly improve MIS performance. Banks with highly developed IT departments recorded superior MIS effectiveness compared to those with less-developed ICT capacities. Unique Contribution to Theory, Practice and Policy: Practically, it highlights the importance of investing in staff skills, system customization, security, and ICT infrastructure. For policy, it recommends stronger ICT governance, regular system upgrades, and improved regulatory guidelines to enhance sustainable MIS operations.enArticle