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Although many firms are investing considerable resources in building and designing strong and effective internal auditing (IA) to improve corporate governance and internal control processes, IA literature is still relatively fragmented. Therefore, this paper aims to provide a systematic review of studies on IA in 27 European countries and the UK.

Based on the Scopus database, 142 papers published between 1987 and 2022 were analyzed. This study focused on evaluating and analyzing the characteristics of literature and the themes investigated with a focus on four key aspects: governance, the effectiveness of IA, the relationship between internal auditors and other parties and risk management to provide directions for future research.

This study found that IA literature did not provide the integrated knowledge of internal audit functions (IAFs) and the factors that could contribute to their implementation as required. The results showed that the UK, Greece and Italy dominate the published literature in terms of the number of studies. There are a few studies that investigate IA in private institutions and nonprofit organizations. Interestingly, a vast majority of studies are not based on theoretical grounds. The results also showed that there is an absence of studies that discuss the impact of cultural and political systems as well as the demographic characteristics of auditors on the implementation of IAFs.

This study is useful for researchers, organizations and regulators because it contributes to the literature by highlighting the intellectual development of IA in the European countries and the UK, providing several directions for future studies. To the best of the authors’ knowledge, this research is the first study to use a systematic review approach in evaluating the intellectual development of IA research in European countries, identifying areas and elements that received less attention in previous studies and providing a roadmap for future studies.

Audit hour reporting is rare internationally. Thus, to what extent shareholders have the power to influence audit effort/hour demand is a question left unanswered. This study aims to use unique South Korean data to determine whether the increasing power of the largest foreign/domestic shareholders and blockholders can influence audit hour demand.

In this study ordinary least squares (OLS) regression analysis is conducted using a sample of Korean listed firms over the 2004–2018 sample period.

The results show: as the percentage equity holding of the largest foreign shareholder and blockholder (>5%) increases, audit hour demand increases. As the shareholding of the largest domestic shareholder increases, audit hour demanded decreases. The association between audit fees/hours is not qualitatively indifferent, after controlling for the audit fee premium effect. Furthermore, the largest foreign shareholder is shown to demand increasingly higher levels of audit hours from Big4 auditors, relative to NonBig4. All results are consistent with audit demand theory.

Whilst previous studies offer audit fee/risk interpretations, this study extends the literature by developing a framework to explain why audit hour demands differ for specific groups. Because audit hour information is rare internationally, the study has important policy implications.

The purpose of this study is to provide a systematic review of research development on auditing in the European Union over the past decade and suggest future research directions.

Following the PRISMA protocol, the authors systematically reviewed the relevant literature and conducted a qualitative content analysis of 107 studies on auditing in the European Union published between 2012 and 2023.

The results indicate increased auditing literature in the European Union from 2012 to August 2023. Around 40% of the papers were focused on six nations: Germany, Spain, Italy, the UK, Sweden and France. Additionally, 35.5% of papers have been published in three major journals: Accounting in Europe, International Journal of Auditing and the European Accounting Review. Moreover, 82.24% of papers used quantitative methods, with a few using qualitative or mixed methods. Also, most of the studies in the sample endorsed the European Union’s auditing reforms, which included implementing a cap on nonaudit fees and enhancing the independence of audit committees. Contrary to this viewpoint, multiple studies have expressed disagreement with enforcing a total prohibition on nonaudit services, as certain services can enhance auditing quality. Similarly, other studies have contested the necessity of mandatory auditor rotation every 10 years, citing the significant additional expenses associated with this practice. Finally, further studies supported the European Union’s decision to make the joint audit voluntary, as it is related to high audit fees and low audit quality.

The limitations of this research primarily stem from the authors’ choices in selecting the database and defining the criteria for searching the studied papers.

This paper offers valuable insights into the future research prospects in the European Union’s auditing field. Hence, this analysis can be helpful for researchers and practitioners in developing this field based on future research recommendations and the identified themes.

To the best of the authors’ knowledge, this paper is the first study to systematically review the developments of the European Union auditing literature over the past decade.

The objective of this study is to present novel evidence regarding the impact of the Key Audit Matters (KAM) disclosure requirements of International Standard on Auditing – 701 (ISA) on the auditing profession concerning reimbursement costs in underdeveloped nations, Jordan.

A year-industry fixed-effects OLS regression model has been employed to test the developed hypotheses. The regression analysis of the period from 2005 to 2022 tests the presence of KAM disclosures in Jordanian finance business, while the regression analysis of the period from 2017 to 2022 tests the actual impact of KAM disclosure following the first implementation of ISA-701 in Jordan.

The analysis has verified that the presence and the proportions of KAM disclosures outlined in ISA-701 resulted to significant auditing compensatory expenses. The findings confirmed that KAM disclosures increase auditor workload, responsibility, complexity, and risk, consequently resulting in higher reimbursement expenses.

The findings of this study have the potential to serve as a basis for the development of a novel financial regulatory legislation or a regulated framework for disclosing significant occurrences. This paper provides new empirical evidence to standard-setters and policymakers regarding the requirement of ISA-701 for external auditors to disclose KAM. This study is advantageous for stakeholders, regulatory agencies, standard-setters, and audit report readers who are interested in KAM disclosures and the implementation of ISA-701. The results could inspire the academic community to obtain fresh data from emerging markets to ascertain the impact of KAM disclosure on audit practices.

To the author's knowledge, this study is one of the few empirical investigations into the impact of current additional disclosure rules on the audit profession concerning reimbursement costs. It provides preliminary evidence linking ISA regulations to corporate productivity in Jordan, a developing nation. Little is known about how developing nation auditors react to KAM disclosures' role in stakeholder protection and how their expanded reporting obligations influence them. This study examines audit behaviour in a weak legal setting, unlike most prior studies, which have been done in highly regulated systems.

This study aims to investigate whether auditors compromise their independence for economically important clients in family business settings.

The authors empirically examine the research question based on China for the years 2011 to 2020. The dependent variable is the auditors’ propensity to issue modified audit opinions, which is a proxy for auditor independence. The authors use relative client audit fees as a proxy for client importance. To address endogeneity issues in the selection of family firms, the authors use the two-stage least squares regression model and, subsequently, the propensity score matching and Hausman firm fixed effect modeling.

This study reveals that the propensity to issue modified audit opinions is positively correlated with client importance. Big-N auditors are more likely to issue modified audit opinions for their economically important family firm clients, whereas such evidence is not found for non-Big-N auditors. Results are consistent and robust to endogeneity test and sensitivity analysis.

This study enriches the literature on auditor independence and the effect of family firms’ ownership structure factors on audit reporting behavior for their economically important clients. Findings may prove useful for managers and practitioners interested in family business.

This study aims to investigate the moderating effect of the COVID-19 epidemic on the relationship between key audit matter (KAM) and auditing quality.

The authors use the ordinary least squares regression on data from 942 firm-year observations of Jordanian non-financial institutions across the period (2017–2022) to test the hypotheses. The authors use content analysis method to measure levels of KAM disclosure.

The investigation’s findings highlight the importance of KAM disclosure in achieving audit quality in line with international standard on auditing no. 701 (ISA-701) requirements. COVID-19 is also found to have a positive relationship with audit quality, further confirming the crisis’s devastating impact on audit complexity and risks and providing evidence for the need for supplementary, high-quality audit services. Due to the correlation between KAM disclosure and increased auditor workload and responsibility, the analysis reveals that the COVID-19 factor strengthens the link between KAM disclosure and audit quality.

This study has the potential to be used as a basis for the creation of a new regulation or standard regarding the reporting of unfavourable events in financial filings. This study’s findings provide standard-setters, regulators and policymakers with current empirical data on the effects of implementing ISA-701’s mandate for external auditors to provide more information on KAM. The COVID-19 crisis offers a suitable setting in which to examine the value of precautionary disclosures in times of economic uncertainty, as well as the significance of confidence interval disclosures and the role of external auditing in calming investor fears. This analysis is helpful for stakeholders, regulatory agencies, standard-setters and readers of audit reports who are curious about the current state of KAM disclosures and the implementation of ISA-701. The results may have ramifications for academia in the form of a call for more evidence expanding this data to other burgeoning fields to have a clear explanation of the real impact of reporting KAM on audit practices.

To the authors’ awareness, this research is one of the few empirical studies on the effect of the COVID-19 crisis on auditing procedures, and more specifically, the effect of disclosures on KAM by external auditors on audit quality. This study’s findings represent preliminary scientific evidence linking the pandemic to business performance. Minimal research has been done on how auditors in developing nations react to pandemic investor protection and how auditors’ enlarged reporting responsibilities affect them. The vast majority of auditing studies have been conducted in a highly regulated system, so this research contributes by examining audit behaviour in a weak legal context.

This study investigates the relationship between companies with military directors and audit fees in Indonesia.

Using upper echelon and audit pricing theories, the authors examine military directors' roles in the demand for and supply of auditing services. The authors use Indonesia as their research setting as their military forces have a long history of involvement in business. The study sample includes 898 firm-year observations on the Indonesia Stock Exchange during 2014–2018.

The authors find a negative relationship between military connections and audit fees. This is consistent with auditors assessing lower audit risk and charging lower audit fees to companies that have leaders with military experience. The study findings are strongest where there is military experience on the board of directors and where the military experience is from the Army.

This study extends the literature on the benefits of military experience in company leadership, especially in the context of auditing research. The study findings also have implications for the selection of board candidates and auditor risk assessments.

This rich descriptive study examines auditors' client risk assessment (i.e. “key audit matters”/critical audit matters) disclosures in expanded audit reports of 328 Financial Times Stock Exchange (FTSE) 350 companies. The study compares auditor-identified client risks with corporate risk disclosures identified in audit committee reports, in terms of number and type of risks. The research also compares variation in auditor-identified client risks between individual Big 4 audit firms. In addition, the study examines auditor ranking of their client risks disclosed.

The study manually content analyses disclosures in audit reports and audit committee reports of a sample of 328 FTSE-350 companies with 2015 year-ends.

Audit committees identify more risks than auditors (23% more risks). However, auditor-identified client risks and audit-committee-identified risks are similar (80% similar), as are auditor-identified client risks between the individual Big 4 audit firms. Only ten (3%) audit reports rank the importance of auditor-identified client risks.

Sample is restricted to one year, one jurisdiction, large-listed companies and companies audited by Big 4 auditors.

The study provides important insights for regulators, auditors and users of financial statements by identifying influences on disclosure of auditor-identified client risks.

The paper mobilises institutional theory to interpret the findings. The findings suggest that auditor-identified client risks in expanded audit reports may demonstrate mimetic behaviour in terms of similarity with audit-committee-identified risks and similarity between individual Big 4 audit firms. The study provides important insights for regulators, auditors and users of financial statements by identifying influences on disclosure of auditor-identified client risks.

This paper aims to shed light on the relationship between audit committee attributes and integrated reporting quality (IRQ).

Data on a sample of 360 European firms selected from the STOXX Europe 600 index between 2010 and 2021 were used to test the model based on multiple regression for panel data to analyze the effect of audit committee attributes on IRQ. This paper considers generalized least squares (GLS) estimation for panel data models.

The findings of this study confirm expectations concerning the impact of audit committee attributes on the IRQ. Indeed, audit committee independence and meetings have a significant positive impact on IRQ. However, no significant association is found between financial expertise and IRQ.

The findings of this paper have significant implications for policymakers, who, through proper legislation, should encourage the formation of larger audit committees and ones with a higher percentage of independent members. They should also establish a minimum number of audit committee meetings per year. These regulations, which aim to increase the efficacy of audit committees’ supervisory and monitoring tasks, would promote corporate transparency and improve IRQ.

This study supports the existing literature. First, it expands the scientific debate on IRQ. Second, unlike previous studies, which used more subjective methods to measure the degree of integrated reporting (IR), this study relied on the CGVS variable from the DataStream ASSET 4 Database. Third, the research is novel because it indicates the crucial role of internal assurance mechanisms in wide managerial reporting practices in European companies. The sample consisted of European firms only, whereas previous studies used a global sample. Finally, this study is based on recent data (2010–2021), while other studies covered the period between 2008 and 2013.

This paper aims to examine the effect of conditional conservatism on audit fees and whether the firm’s engagement in sustainable practices moderates the relationship between conditional conservatism and audit fees.

Using a sample of 3,767 firm-year observations from 14 European Union countries over the period of 2006–2019, the authors adopt the ordinary least square estimator to perform a panel data analysis of the effect of conditional conservatism on audit fees, and the moderating role of the environmental, social and governance (ESG) scores on the relationship between conditional conservatism and audit fees.

The authors find that conditional conservatism has a significant negative effect on audit fees, suggesting that auditors charge lower audit fees on more conservative clients. The authors also find that firms engaging in ESG actions, whether combined or individual, pay higher audit fees. More interestingly, the authors provide evidence that the negative effect of conditional conservatism on audit fees is mitigated only when ESG performance is considered in combination. This implies that firms exhibiting less commitment to ESG sustainability practices are prone to paying reduced audit fees when engaged in more conservative reporting. The findings remain robust after conducting a battery of tests.

The findings of this study have practical implications for several parties, including companies, auditors and regulators. This study emphasizes the potential benefit associated with using conservative accounting practices in terms of shaping downward the amount of audit fees. However, it also highlights the importance of considering the additional audit costs associated with higher ESG scores when making decisions about implementing sustainable practices.

Unlike prior studies that investigate the direct impact of sustainable practices on audit fees, the present work contributes to the literature on the benefits and costs of ESG by examining the moderating role of ESG performance in the association between audit fees and conditional conservatism. To the best of the authors’ knowledge, this study is the first to examine this relationship. Theoretically, the research integrates the theories of audit risk and agency to provide a more comprehensive understanding of the drivers of audit fees.