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This study aims to assess the relationship between internal control weakness and different types of auditor opinions in fraudulent and non-fraudulent firms. The study's main objective is to investigate fraud in business firms and analyze internal controls and types of proposed opinions by the auditor about his desired firm. The outbreak of fraud in firms is of utmost importance to a broad spectrum of society. Internal controls and the auditor's role in preventing and detecting frauds should not be taken for granted.

The present study's statistical population includes 179 listed firms on the Stock Exchange selected as the study sample using the systematic elimination method during 2012–2019. As the study's dependent variable (the type of auditor’s opinion), research hypotheses were analyzed using the Logit regression model.

The results show that the relationship between internal control weakness and opinion type is significantly different in fraudulent and non-fraudulent firms. Moreover, the relationship between internal control weakness and type of auditor opinion in fraudulent firms and the relationship between internal control weakness and type of auditor opinion in non-fraudulent firms are significant.

By assessing the related literature, the authors have found no study to directly assess the comparative relationship between internal control weakness and the type of auditor opinion, which can be named as the main objective of the study.

The purpose of the paper is to investigate the extent to which a model based on financial and non-financial variables predicts auditors' decisions to issue qualified audit reports in the case of companies listed on the Tehran Stock Exchange (TSE).

The authors utilized data from the financial statements of 96 Iranian firms as the sample over a period of five years (2012–2016). A total of 480 observations were analysed using a probit model through 11 primary financial ratios accompanying non-financial variables, including the type of audit firm, auditor turnover and corporate performance, which affect the issuance of audit reports.

The results demonstrated high explanatory power of financial ratios and type of audit firm (the national audit organization vs other local audit firms) in explaining qualifications through audit reports. The predictive accuracy of the estimated model is evaluated using a regression model for the probabilities of qualified and clean opinions. The model is reliable, with 72.9% accuracy in classifying the total sample correctly to explain changes in the auditor's opinion.

This study contains some limitations. First, it is likely that similar researches in developed countries set a large sample (e.g. over 1,000 firms) including more years, but the authors cannot follow such a trend due to data access restrictions. Second, banks and financial institutions, investment and holding firms are removed from the sample, because their financial structure is diverse. The third limitation of the study represents the different economic and cultural conditions of Iran compared to other countries. Future studies could focus on internal control material weaknesses or earnings management to predict audit opinion in emerging economies including Iran.

The paper has practical implications and can assist auditors in identifying factors motivating audit report qualifications, mainly in emerging economies.

The paper contributes to auditing research, since very little is known about the determinants of audit opinion in emerging markets including Iran; it also constitutes an addition to previous knowledge about audit opinion in the context of TSE. The paper is one of the rare studies predicting auditor opinions using both financial variables and non-financial metrics.

The purpose of this paper is to examine the incremental information content of audit opinion while considering opinion determinants, such as auditor and auditee size, or a firm’s financial state.

A market valuation model is employed using US firm data collected over 30 years. The model relates stock returns to earnings and incorporates as additional variables auditors’ opinion types, opinion determinants and their interactions with audit expression.

The findings suggest that audit opinion has a significant market impact. The estimated positive or negative information content of the audit opinion types is associated with certain opinion determinants, such as auditor and auditee size and a firm’s financial state.

Additional firm-year observations regarding certain opinion qualifications could benefit future research.

This study offers useful insights by demonstrating the importance of auditing profession to the users of financial statements. It examines investors’ perception of each audit opinion type and the conditions under which this expression has the most serious effects. The results demonstrate the role of audit opinion and its cause-effect relationship with various economic events, allowing regulators not only to track the efficiency of various audit policy changes but also act preventively and amend the regulatory framework.

This paper empirically supports the significance of the auditing process and audit opinions by examining investor perceptions. It employs a value relevance model, in contrast to market-based research that adopts an event study methodology.

The purpose of this paper is to examine investor reactions to auditor opinions containing qualifications or an emphasis of matter paragraph related to going concern uncertainty or financial distress. In particular, abnormal returns are analyzed around audit report dates.

The event study methodology, focusing on a short event window, was used to determine whether there is an immediate market reaction to the audit report announcement, as might be expected assuming efficient stock markets.

Overall, this analysis shows that the audit reports investigated have information content for investment decisions. In particular, the qualifications expressed in the audit report have a negative effect on stock prices. It is also shown that an unqualified opinion with an emphasis of matter paragraph regarding going concern uncertainty or financial distress has a positive effect on stock prices. These results also elucidate the distinction between different types of opinions in the Italian context.

This paper has attempted to limit the possible concurrent effects on stock prices using a short window event study methodology. However, the possibility that some other event may have occurred during this event window cannot be excluded. Among the policy implications coming from this research, it is argued that the authorities should regulate the public disclosure of audit reports, so that the information becomes available to the audited company and the other stakeholders on the same day, which, in theory, would be the day that the audit process concludes with the signing of the audit report.

The findings of this paper show the relevance of audit reports, distinguishing the different impacts based on the types of audit opinions issued in a specific jurisdiction (qualified and unqualified with an emphasis of matter paragraph).

The purpose of this paper is to examine whether credit ratings issued by Fitch predict auditor’s opinion for the Tunisian financial companies. It studies the association between Fitch’s credit rating and the audit opinion.

The whole population was analyzed. It is composed of 35 banks, leasing companies and factoring companies in Tunisia. The hand-collected data over 11 years (2005–2015) were used and a multiple-ordered logistic regression was performed.

The findings show that firms with a high short-term grade, a high long-term grade or a positive outlook are more likely to receive an unqualified audit opinion. In addition, companies with a stable outlook are more likely to receive an explanatory paragraph, a qualification or a going-concern opinion.

Studies examining the relationship between credit ratings and audit opinion are rare. This piece of research adds to knowledge about the relationship between different components of agency ratings and the auditor’s opinion in a developing country. Previous studies have investigated the case of developed countries and have been interested in the only impact of the long-term credit rating. This study analyzes three components of credit rating, namely long-term credit rating, short-term credit rating and rating outlook. In addition, it sheds light on the effect of various rating grades issued by rating agencies on the audit opinion. It gives a broader view of the relationship between credit ratings and audit opinion.

This paper aims to analyze the relationship between the following auditor's characteristics with detecting frauds in the listed companies on the Tehran Stock Exchange.

A multiple regression model is used to test the research hypothesis. The hypothesis was further tested with a sample of 187 companies listed on the Tehran Stock Exchange (1,309 observations) from 2012 to 2018 and by using multiple regression models based on panel data and the random-effects model.

The results suggest a positive and significant relationship between audit firms' size, auditor rotation, specialization in the industry, the audit market's focus, auditor's independence, audit report lag and renewal of financial statements with fraud detection. The results revealed a significant relationship between the period of auditor tenure, auditor's narcissism, audit fees and the type of auditors' opinion (un-qualified opinion) with fraud detection.

As the present study is a pioneer in examining this issue in the emerging markets, it provides users, analysts and legal entities with useful information about auditor characteristics that significantly affect the fraud detection of financial statements. The results mitigate the literature gap and improve knowledge in this area.

Mandatory auditor firm rotation (mandatory rotation) has been a controversial issue in the United States for many decades. Mandatory rotation has been considered at various times as a means of improving auditor independence. For example, in the United States, the Public Company Accounting Oversight Board (PCAOB) has considered mandatory rotation as a solution to the independence problem (PCAOB, 2011) and the European Parliament approved legislation that will require mandatory rotation in the near future (Council of European Union, 2014). The concept of implementing a mandatory rotation policy has been encouraged by some constituents of audited financial statements and rejected by other constituents of audited financial statements. Although there are apparent pros and cons of such a policy, the developmental process of such a policy in this country has not necessarily been an open-democratic, objective process. Universal mandatory rotation may or may not be the ideal solution; however, an open-democratic, objective process is needed to facilitate the development of a solution that considers the needs of all major stakeholders of audited financial statements – not simply accounting firms and public companies, but also investors. The purpose of this paper is to critically examine key issues relating to mandatory rotation and to encourage and stimulate future research and ongoing dialogue regarding this issue, in spite of efforts by certain constituents to silence the issue. This paper provides an overview of the various reasons, including practical, theoretical, political, and self-motivated reasons, why a mandatory rotation policy has not been implemented in the United States in order to address the potential conflict of interest between the auditor and client. This paper will also discuss how some deliberations of mandatory rotation have been flawed. The paper concludes with a summary of key issues along with two approaches for regulators, policy makers, and academics to consider as ways to improve the process and address auditor independence. The authors are not advocating for any specific solution; however, we are advocating for a more objective, unified approach and for the dialogue regarding auditor rotation to continue.

The purpose of this paper is to demonstrate a deeper understanding about the reasons behind difference in previous studies’ results in the field of audit quality determinants.

A meta-analysis method is employed in which 52 studies including 40 international studies from authentic scientific articles during the year 2000–2015 and 12 national studies out of authentic national scientific articles from 2001 to 2015 are taken to account as sample studies. Audit firm size, auditor tenure and auditor specialization are set as independent variables and audit quality is the only dependent variable in the current paper.

The results indicate that audit firm size and auditor specialization are positively associated with audit quality. In other words, contracting with larger audit firm and specialized auditor results in delivering higher quality audit services.

The current study is the first study to be conducted in the field of audit quality determinants. The results may be beneficial both for standard setters as well practitioners in a way that it provides evidence that contributes to basis policy and audit-standard makers about domination and determinants of audit quality.

While existing research explores the impact of audit market competition on audit fees and audit quality, there is limited investigation into how competition in the audit market influences auditors' writing style. This study examines the relationship between audit market competition and the readability of audit reports in Iran, where competition is particularly intense, especially among private audit firms.

The sample comprises 1,050 firm-year observations in Iran from 2012 to 2018. Readability measures, including the Fog index, Flesch-Reading-Ease (FRE) and Simple Measure of Gobbledygook (SMOG), are employed to assess the readability of auditors' reports. The Herfindahl–Hirschman Index (HHI) is utilized to measure audit market competition, with lower index values indicating higher auditor competition. The concentration measure is multiplied by −1 to obtain the competition measure (AudComp). Alternative readability measures, such as the Flesch–Kincaid (FK) and Automated Readability Index (ARI) are used in additional robustness tests. Data on textual features of audit reports, auditor characteristics and other control variables are manually collected from annual reports of firms listed on the Tehran Stock Exchange (TSE).

The regression analysis results indicate a significant and positive association between audit market competition and audit report readability. Furthermore, a stronger positive and significant association is observed among private audit firms, where competition is more intense compared to state audit firms. These findings remain robust when using alternative readability measures and other sensitivity checks. Additional analysis reveals that the positive effect of competition on audit report readability is more pronounced in situations where the auditor remains unchanged and the audit market size is small.

This paper expands the existing literature by examining the impact of audit market competition on audit report readability. It focuses on a unique audit market (Iran), where competition among audit firms is more intense than in developed countries due to the liberalization of the Iranian audit market in 2001 and the establishment of numerous private audit firms.

This paper aims to assess auditor narcissism’s effect on audit market competition (auditor concentration, clients’ concentration and competitive pressure).

This paper’s method is descriptive-correlational based on published information from listed firms on the Tehran Stock Exchange from 2012 to 2018 using a sample of 188 firms (1,310 observations). The method used for hypothesis testing is linear regression using panel data.

The results show a negative and significant relationship between auditor narcissism and audit market competition and its indices, including auditor concentration, clients’ concentration and competitive pressure. Moreover, a positive and significant relationship was observed between audit quality and audit market competition and its indices, including auditor concentration, client concentration and competitive pressure.

To analyzes competition indices in the audit market (auditor concentration, clients’ concentration and competitive pressure). The variable is assessed once more using the exploratory factor analysis of the so-called three variables single variable, named audit market competition. So the central question of the study is investigated within a broader sense. Moreover, as the present study is carried out in the emergent financial markets with extremely competitive audit markets to figure out the effect of auditors’ intrinsic characteristics on such markets’ competitiveness, it can provide useful information in this field.