One of the primary factors that could cause audit engagements to go over the planned budgeted hours is poor engagement supervision. Effective supervision ensures that the audit is progressing as planned, that issues are identified and addressed promptly, and that resources are used efficiently. Without proper supervision, audits may experience delays, scope creep, and inefficient use of time, leading to overruns in budgeted hours. Other factors, such as untimely follow-up and limited staff resources, can contribute to inefficiencies, but poor supervision is often a key driver.
Reference:
The Institute of Internal Auditors (IIA) - Standards for the Professional Practice of Internal Auditing, Standard 2340 - Engagement Supervision