Öz
In recent years, the audit profession was confronted with different regulations, revised rules on Non-Audit Services (NAS) and on Auditor Independence. In-depth, Professional Accountancy Bodies amended their independence rules according to the Sarbanes-Oxley Act of 2002. For instance, the Securities Exchange Commission (SEC) and the American Institute of Certified Public Accountants (AICPA) in the USA, Capital Market Board (SPK) in Turkey made amendments to their independence rules on Non- Audit Services and on auditor independence in light of the Sarbanes-Oxley Act of 2002. The purpose of this paper is to examine whether “non- audit Services (NAS)” jeopardize institutional “investors’ perception of auditor independence in Turkey”. Therefore, the questionnaire was administered to 34 institutional investors in İstanbul, Turkey. It was generally found that institutional investors’ perception of auditor independence is not impaired at the time of the joint provision of NAS and audit Services to an audit Client.