This paper describes the importance of an external audit and its contribution on increasing the quality of financial statements of limited liability companies (LLC) for the period of 2004-2010 in Kosovo. In the theoretical framework of the study, regularity on the audit of financial statements is designed to be a causal factor for the quality of financial statements, expressed through the types of audit opinions on the audited financial statements. The empirical basis of the study is on data collected from all licensed auditors in Kosovo, who have performed financial audits in Kosovo LLC's, in the period of 2004-2010. The comparative method was used to determine differences in the quality of financial statements LLC's which audited its financial statements for the first time, compared with the LLC's that have performed the audit of its financial statements for a period longer than one year, classifying them according to the type of activity, annual turnover, and number of employees. Surveys were used as the method for collecting and analysing necessary information. Our research is based on analysis of the quantitative values of the independent variables and type of opinion and recommendations contained within the audit report and management report. To ensure quality of the data, we have utilised the Critical Incident Technique (CIT). Using CIT it was possible to expand the number of areas related to the impact of the relevant factors on the quality of financial statements. Identified areas provided a solid foundation to establish two basic dimensions for evaluating quality of financial reporting through comparison - type of opinion and recommendations. We collected a total of 188 critical cases that were reviewed and classified them into twelve area dependent variables (dimensions that affect the quality financial statements) and two areas that are related to the independent variable (type audit opinion and recommendations of the auditor).