I investigate the impact that adherence to the Institute of Internal Auditors' Core Principles has on the likelihood that an internal auditor's effectiveness is threatened through pressure to modify valid audit findings. I use responses from the Institute of Internal Auditors' 2015 Common Body of Knowledge Practitioner Survey to show that higher adherence to the Core Principles by both internal audit staff and CAEs is associated with a lower likelihood of being pressured to modify audit findings. I also explore which of the ten Core Principles are dominant in explaining these associations to inform the future development of the internal audit profession. Finally, I investigate the sources of pressure to modify audit findings and explore the effect the Core Principles have in mitigating pressure from each source. My findings are relevant to the Institute of Internal Auditors, internal audit practitioners, and academics interested in internal audit or corporate governance.

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