Financial statement errors and frauds frequently encountered in businesses: A research in BIST 100

The aim of this thesis is to identify the errors and frauds on which unqualified opinions are based in the audit reports of the transactions in the BIST 100 index operating in Borsa Istanbul. For this purpose, the independent audit reports of the transactions in the BIST 100 index between 2008 and 2022 were analyzed and the errors and frauds in the audit reports that do not contain unqualified opinions were identified. In the study, 3324 accessible audit reports of 224 companies were analyzed by document analysis method. The 36 audit reports that could not be accessed were excluded from the scope of the study. As a result of the analysis, no accounting fraud was found, but valuation error (36), transfer error (17), recording error (9), classification error (4), forgetting error (3) and accounting error (2) were identified as accounting errors.