Abstract
Purpose This study explores the role played by audit committees (ACs) in illuminating the effectiveness of internal audit (IA) as a facilitator of the achievement of organisational goals, specifically examining whether the AC mediates the relationship between IA and firm performance (FP). Design/methodology/approach Data are gathered from survey questionnaires directed to chief internal auditors (CIAs) and from the annual reports of 119 listed companies in Saudi Arabia (SA) and the United Arab Emirates (UAE). Ordinary least squares (OLS) regression and mediation tests are used to assess the study's hypotheses. Findings The findings indicate that the independence of the AC and having members with accounting and auditing expertise mediate the effects of IA independence and size on FP. However, no such mediation is found with respect to IA competence and FP. Further, AC meetings do not mediate the effects of IA characteristics on FP. Additional measures of the tested variables determine the robustness of the obtained findings. Originality/value While much research examines the relationship between FP and corporate governance (CG) mechanisms, this study considers IA, as a key element of CG, and its impact on FP, which has received more limited attention. Hence, the findings contribute to the literature by providing new understandings regarding IA as a component of CG and its relationship with FP. Furthermore, they bring additional evidence of the influence of IA upon FP, which is mediated by AC independence and expertise.