Effect of Board Characteristics and Internal Control Quality on the Financial Performance of Deposit Money Banks in Nigeria

Abstract

This study examined the effect of board characteristics and internal control quality on the financial performance of deposit money banks in Nigeria, with financial performance operationalised through two accounting outcomes, return on assets and return on equity. Two concerns motivated the enquiry. Recurrent episodes of bank distress and fraud have persisted in Nigeria despite successive governance reforms, which raises the question of whether board structure and control quality deliver measurable performance value in the sector expected to embody them; and the empirical literature has largely examined these mechanisms against a single profitability measure, leaving open whether they surface differently on the asset side and the equity side. Anchored on Agency Theory and complemented by Stewardship and Resource Dependence perspectives, the study specified board characteristics through board size, board independence and gender diversity, entered internal control quality as a fourth regressor, and regressed each of the two outcomes separately on this common set of predictors so that each objective corresponded to one performance dimension. Ten listed deposit money banks with complete records were selected purposively and observed over the period 2015 to 2024, yielding a balanced panel of 100 bank-year observations drawn from audited annual reports and regulatory publications. Data were analysed using descriptive statistics, Pearson correlation and panel regression, with the Hausman test used to select between the fixed and random effects estimators; the random effects estimator was preferred in both models. Board characteristics and internal control quality exerted no significant joint effect on return on assets (R² = 0.026, F = 0.644, p = 0.633), and the first null hypothesis was retained. The same predictors exerted a significant joint effect on return on equity (R² = 0.183, F = 5.320, p = 0.001), driven by board independence and gender diversity, and the second null hypothesis was rejected; internal control quality was insignificant in both models. The study concludes that the governance mechanisms examined register on shareholder returns rather than on asset efficiency, that gender diversity is the most robust governance signal in the data, and that the performance dividend of internal control accrues through risk containment rather than through immediate profitability. It recommends optimal rather than larger boards, deliberate strengthening of independence and female representation, and continued investment in internal control systems appraised on a defensive basis.