Türkiye’deki Bağımsız Denetim Piyasasının Yoğunlaşma Düzeyindeki Değişiminin Denetim Firmalarının Kazanç Dağılımına Etkisi

Independent auditing is an assurance system to increase the reliability of financial data published. In Turkey, independent auditing first started as voluntary in the 70s and became mandatory for certain firms in the 80s with the establishment of legal legislation. Many studies have been conducted in the independent audit market over time, as it is critical for ensuring the reliability of financial data. This study was conducted to determine the level of concentration of the audit market in Turkey with the most recent data and to reveal the change in the level by comparing it with previous studies and to monitor the effect of the change in the concentration rate on the change of audit firms. For this purpose, data obtained from a total of 372 transparency reports published between 2020 and 2023 were used. In order to compare the results of the study with previous studies conducted in Turkey and to observe the change, analyses were conducted using the same methods as previous studies, namely N-Firm Concentration Ratio, Lorenz Curve, Gini Coefficient and Herfindahl-Hirschman Index. As a result of the analysis, it is understood that although the concentration of the audit market in Turkey has decreased slightly, the market still maintains an oligopoly outlook and the limited decrease in the concentration rate has no effect on the distribution of earnings among independent audit firms according to the Gini Coefficient data and the unfair distribution continues. In addition, it is concluded that 4 large audit firms continue to dominate the audit market and Turkey is similar to the European Union countries in terms of audit market concentration.