Since always external addressees of the statutory audit raise the question: what were the reasons to discontinue an audit engagement? In the context of the currently revised regulations on the European audit market and the previous discussion, this question has been of relevance again. Thereby the presumption that companies initiate a change of the auditor due to opportunistic motives, is of special relevance for standard setters and the capital market. The results of previous research show no comprehensive, uniform picture of the motives for an auditor change; especially for the German audit market there are only few insights so far.
Against this background, factors influencing the change of the statutory auditor were examined in this dissertation. In the empirical study auditor changes at listed companies in Germany were analyzed. These auditor changes were tested for a statistical correlation with potential influencing factors, which were derived from the comprehensive analysis of previous research, or which represent relevant facts that have not been considered this way in research so far. Because of its relevance, a comprehensive analysis was dedicated to the question to what extend opportunistic motives play a role for auditor changes.
As a result of this study, factors influencing auditor changes were identified and their effects were described statistically. Thereby, detailed insights into causal relationships on the German audit market could be given. Furthermore, the role of the audit committee in the context of auditor changes was analyzed. With regard to auditor changes the analysis revealed an effect of an audit committee on the impact of potential influencing factors, particularly in the case of potential disagreements between client and auditor. Furthermore, the results give evidence that an audit committee has a “regulating” effect on the auditor selection, if the auditor dismissal may have occurred due to opportunistic motives. Extensively a potential opinion shopping behavior was investigated. Opinion shopping is an opportunistic, undesirable behavior from the perspective of the standard setter. Indeed, evidence was found that auditor changes take place more frequently in appropriate incentive situations. However, the analysis could not prove that opinion shopping leads to the desired results and thus is effective.
For the German audit market, but also internationally, these results have not been obtained yet in a comparable level of detail. Overall, the results of this study provide insights into the factors influencing auditor changes, which can be of relevance among others for standard setters and the capital market. The results shed light on the dynamics in the audit market, which could be used as a decision-making basis for future regulatory action. | English |