Internal audit is emphasized too much in Public Ltd. IT companies. Research on internal audit and its success factors, effects & effectiveness has mainly focused on public limited IT company. It is also relevant for private limited IT company. This article is a case study conducted on ARENA IT Company, a private limited companies in the country to see the relevance and effectiveness of internal audit for private limited IT Company. The study systematically examined the effectiveness of internal audit in ARENA IT Company. The findings indicate that internal audit, is important and contributing for private limited IT company also. The paper additionally discovered that internal auditors more often than not use audit tools and strategies, inclusive of danger primarily based planning digital, communique, analytical evaluations and operating papers. The paper concludes that, whilst different audit tools and techniques are essential to have, the most favored enhances the first-rate of the audit method.