Abstract
The purpose of adopting an internal audit is to constantly monitor the conduct of the organization’s business activities, which leads to a timely response to any type of violation. It should be noted that the organization has the right to classify violations independently, taking into account its scale. However, legal entities subject to mandatory audit should pay increased attention to control over accounting and preparation of financial statements. The authors in the article revealed the necessity, purpose, and functions of internal audit for small and medium-sized businesses in Kazakhstan.