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The purpose of this paper is twofold. First, the authors investigate a firm’s decision to provide a CSR report, and if so, whether to have the report assured and to seek higher quality assurance as reflected through the choices of the scope of the assurance and type of assurer, Big 4 accounting firm vs specialist consultant. Second, the authors investigate the impact of voluntary assurance of CSR reports, assurance scope and type of assurer on the likelihood of inclusion in the DJSI and on market valuation.

The study’s sample consists of 17,050 firm-year observations from 40 countries with CSR reports available from Corporate Register and ESG metrics available from ASSET4 over the period 2009–2015. The study first empirically examines the associations between CSR commitment and each of CSR report provision, CSR report assurance, assurance scope and type of assurer. It then examines that association between both inclusion in the DJSI and market valuation with each of CSR report assurance, assurance scope and type of assurer, using inclusion in the DJSI as an objective measure of a firm’s reputation for sustainability given its recognition as a leading indicator for corporate sustainability and market valuation as a reflection of the broader set of capital market participants.

The authors establish two key findings consistent with the predictions of signaling theory. First, we show that high CSR commitment firms are more likely to: provide standalone CSR reports; obtain assurance; obtain assurance from a Big 4 accounting firm; and, adopt higher assurance scope. Second, the authors find that both CSR report assurance and assurance scope increase the likelihood of inclusion in the DJSI, but that the type of assurance provider does not. Alternatively, the authors find that capital market participants appear to value the provision of a CSR report only when it is assured by a Big 4 accounting firm.

The results in the existing literature exploring the capital market benefits to CSR Assurance have been mixed. Firms that voluntarily obtain CSR Assurance incur a cost in doing so and must perceive a net benefit from obtaining such assurance. Despite the limited guidance currently provided by existing CSR standards, we establish the existence of benefits to obtaining CSR Assurance in terms of enhanced likelihood of DJSI inclusion and, more generally, enhanced market valuation. The discussions with DJSI analysts indicate that CSR assurance does enhance the perceived reliability of CSR data, thus improving user confidence.

The COVID-19 pandemic has been adding pressures on companies to commit to their social and ethical responsibilities. Corporate social responsibility (CSR) reporting is the main tool through which companies communicate their social behaviour and the need for credible information is censorious during the crisis. This paper aims to measure the level of COVID-19 disclosures in CSR reports by using an automated textual analysis technique based on a sample of UK companies and investigate whether the level of disclosure is enhanced for companies that subject their CSR reports to an assurance process.

The study sample consists of FTSE All-share non-financial listed companies. The authors use a computer-aided textual analysis, and we use a bag of words to capture COVID-related information in the CSR section of the firm’s annual reports.

The results suggest that the existence of independent external assurance is significantly and positively associated with the provision of COVID-19 information in CSR reports. The authors also find that when assurance is provided by Big 4 accountancy firms, the disclosure of COVID-related information is enhanced. Furthermore, large companies are more likely to disclose COVID-related information in their CSR reports that are externally assured from top-tier accountancy firms, suggesting that assurance could be a burden for smaller firms. Overall, the findings suggest that assurance on CSR reports provides an “insurance-like” protection that mitigates the risks and signals the management’s ethical behaviour during the pandemic.

The study approach helps to assess the level of corporate engagement with COVID-19 practices and the extent of related disclosures in CSR reports based on the COVID-19 Secure Guidelines published by the UK government. This helps to emphasise how companies engage and communicate COVID-19-related information to stakeholders through CSR reports and ensure a safe working environment during this pandemic. Managers will need to assess the costs and benefits of purchasing assurance on CSR disclosures, giving the ethical signal that assurance sends to the market and protection that it covers during the crisis.

This paper provides a shred of unique evidence of the impact of the existence of external assurance and the type of assurer on the disclosure of COVID-related information in CSR reports. To the best of authors’ knowledge, no study has yet investigated the corporate disclosure on an unforeseen event in CSR reports and the role of CSR assurance in this respect.

This paper aims to investigate the relationship between sustainability reporting and firm value, and subsequently, ascertains the moderating effect of assurance and the type of assurer on the sustainability reporting–firm value nexus.

The study is based on sample firms from the Johannesburg Stock Exchange (JSE) in South Africa. The fixed‐effect panel data analysis method is used to estimate the coefficients of the variables.

A significant positive relationship is found between sustainability reporting and firm value. The results also suggest that sustainability assurance has significant explanatory power on firm value. Furthermore, the authors found that the market is unable to distinguish between sustainability assurance services provided by Big 4 audit firms and specialist consultant firms.

The authors expect managers will see sustainability reporting and assurance as a business strategy with incremental market value. The study should also serve as a reference for stakeholders engaged in the advocacy for the adoption of sustainability assurance practices on the JSE and other emerging markets.

The study finds that the South African market rewards firms that purchase third-party assurance to guarantee the integrity of their corporate social responsibility reports. This understanding could help encourage more firms to embrace the concept of sustainability assurance.

The study offers a first-hand information on how market participants in Johannesburg, an emerging economy, view sustainability assurance and the services provided by the different assurers.

This paper aims to clarify whether assurance on non-financial corporate social responsibility (CSR) reports impacts the perceptions and decisions of banks as capital providers. The authors investigate the effects of the type of assurance provider and the level of assurance provided on decisions by banks to grant credit, make their own personal investments or recommend share purchases to their customers. The study aims to expand the domain of assurance on CSR reports (CSRR) by taking up a call by Cohen and Simnett (2015), who ask for behavioral research on how non-financial report’s intended users interpret and react to assurance.

The paper is based on an experiment case on a fictitious company with a 2 × 2 + 1 between-subjects design. To overcome concerns regarding external validity and to prove results in a real-world setting, the authors selected German bank directors as subjects due to the extremely high relevance of banks to the German economy. The authors investigated the perceptions of 69 bank directors and analyzed the influence of CSR assurance on their decisions.

The findings suggest that assurance positively influences confidence in CSRR and that, consequently, bankers are more likely to make favorable decisions toward the reporting companies, such as approving applications for credit, investing themselves in the company or recommending the purchase of shares to their clients. These effects are stronger when an accounting firm provides the assurance and when the assurance level is reasonable rather than limited.

The arguments presented are, strictly speaking, limited to the case in the experiment and the views held by the bank directors at the time the authors sent out the questionnaires. Moreover, the cell sizes are quite small. Nevertheless, the authors were able to find highly significant results.

The main implication of the paper is that the purchase of CSRR assurance services has a positive effect on bank directors’ perceptions and decisions. They favor the provision of such services by accounting firms and they prefer a reasonable assurance level. Thus, it can be concluded that bank directors perceive quality differences between assurance providers, are able to recognize the difference between reasonable and limited assurance and that the related information is relevant for their decisions.

This paper fulfils an identified need to study the influence of CSRR assurance on decisions by bank directors. The observation of a high decisions-usefulness of CSRR assurance suggests that regulators should consider mandating some form of assurance on non-financial reports throughout the EU member states.

This study aims to examine the relationship between corporate social responsibility (CSR) award and sustainability assurance levels for the French CAC 40 companies.

A sample of 57 French companies in the CAC 40 index corresponding to 448 observations was analyzed between 2008 and 2020 using an ordinal regression.

The main results conclude that the inclusion in the Dow Jones Sustainability Index World, the CSR award and the introduction of the Grenelle 2 law have a significant influence on sustainability assurance levels. However, incentive compensation does not appear to be relevant to explain sustainability assurance levels.

The present study focuses on a sample, limited to companies belonging to the CAC 40 index. To enhance the understanding of sustainability assurance levels, this research may include other global sustainability indices, such as the MSCI World and the FTSE4Good World, in the CSR awards.

This study could be useful for audit practitioners, leading them to reconsider their evaluation methods and take into account CSR incentives for a more objective analysis. Regulators should investigate the current CSR issues to improve CSR disclosure standards. Finally, these findings could motivate other researchers to expand the scope of the research to diverse contexts.

This study helps fill the gap existing in sustainability assurance literature by highlighting the relationship between CSR rewards and sustainability assurance levels.

This study aims to review the literature on non-financial information (NFI) assurance including external assurance of sustainability reports (SRA) and integrated reports (IRA). The objectives are as follows: provide an overview of academic research; understand the nature of NFI assurance engagements by organising the literature around the five key elements of an assurance engagement; develop a framework for understanding NFI assurance; and provide directions for future research.

The study undertakes a structured literature review of 179 articles published from 1999 to 2023.

The review identified 324 researchers located in 35 different countries who published 179 articles on SRA and IRA. The researchers, their locations, journals, methods, theories and themes are examined. The literature is structured around the definition of an assurance engagement including a tripartite arrangement, subject matter, a suitable criterion, sufficient appropriate evidence and a written assurance report. A framework for understanding NFI assurance is offered. Avenues for future research, structured around the five elements of an assurance engagement, are presented.

Researchers will benefit from an overview of the literature and guidance on areas for future research. Lecturers can use the findings to develop content for their auditing courses. Reporting managers will benefit from a better understanding of this new form of assurance. Regulators can use this study’s insights to better inform the development of laws and corporate governance codes mandating NFI assurance. Standard setters can use these findings to guide the emergence of the new assurance standards. Assurance practitioners may use this research to inform practice.

The findings may prove useful in addressing capture, which deters NFI assurance from enhancing disclosure credibility and fulfilling its transparency and accountability role. This is to the detriment of the wider society.

The consolidation of the literature around the five key elements of an assurance engagement is unique. The framework devised offers useful insights into the dynamics of assurance generally and NFI assurance more specifically. The study is timely given the new European Union regulations on NFI reporting and assurance and the work of the International Audit and Assurance Standards Board in developing a specialist NFI assurance standard.

This paper aims to examine the communicative value of assurance reports by investigating whether the impact on information asymmetries is contingent on the length of the contractual relationship between clients and assurance providers, which can compromise the provider’s independence.

Using a firm-level data set of publicly listed international firms from 2007 to 2016, the authors estimate several regression models for panel data by using the generalized method of moments estimator to address the endogeneity issue.

Results find that the greater the communicative value in assurance statements, the lower the information asymmetries. However, this effect is constrained when the assurance provider’s independence is compromised due to an excessively long-term contractual relationship. In other words, assurance statements with more informative value enhance the firm’s transparency and increase users’ confidence in the sustainability information provided. However, the loss of independence linked to longer tenure jeopardizes the communicative value of the assurance report and contributes to reducing information asymmetries.

The study makes at least three clear contributions to current literature. First, the authors contribute to the limited existing research about the communicative value attributed to assurance statements by stakeholders. Second, the authors indirectly contribute to the literature that analyses whether stakeholders understand the assurance report, a complex statement in a growing market. Addressing the communicative value of assurance is certainly a difficult task, as it is a novel and complex activity. Third, the main contribution is providing initial empirical evidence about the moderating effect that assurance provider tenure has in the relationship between the informational content of the assurance report and the level of information asymmetries. To date, there is no empirical evidence regarding the moderating effect of long assuror’s tenure as an important feature of the assurance market, and beyond that, regarding its impact on the communicative value assigned by stakeholders to assurance statements.

This paper surveys corporate officers responsible for greenhouse gas (GHG) reporting and assurance to determine the attributes that influence their choice between an accounting and a non-accounting GHG assurance provider. Differences in the relative importance of these attributes between those selecting accounting and non-accounting assurers are also explored.

A survey questionnaire was completed by 25 corporate officers responsible for reporting and voluntarily assurance of GHG emissions in Australia. The questionnaire asked the respondents to indicate the relative importance of 41 company and assurer attributes in influencing their assurance provider choice.

Results indicate that attributes related to the assurance provider, such as team and team leader assurance knowledge, reputation, objectivity and independence, are more influential than attributes related to the nature of the company or the nature of the GHG emissions. Attributes such as geographical dispersion of operations were found to be differently important to this decision between companies purchasing assurance from accounting and non-accounting firms.

The study’s main limitation is the small number of participants. Future research may extend this study by exploring the conditions under which companies voluntarily assure GHG emissions as well the motivations of responsible officers in their assurer choice.

This paper provides valuable insights to GHG assurers to assist their understanding of the attributes that are important to potential GHG assurance clients.

The study makes unique contributions to the assurer choice literature by not only addressing this issue in the context of the dichotomous GHG assurance market but also by addressing it from the perspective of the assurance purchaser.

Credibility concerns regarding integrated reports can harm the intended decrease of information asymmetry between a firm and its investors. Therefore, it is crucial to examine whether voluntary third-party assurance enhances the credibility of integrated reports and, thus, decreases information asymmetry. Furthermore, this study aims to investigate the interaction effect between assurance quality and the disclosed connectivity of the capitals, a distinguishing feature of integrated reports.

Content analysis is performed of the 176 assurance statements included in the 269 integrated reports of Forbes Global 2000 firms disclosed from 2013 to 2015 and the 269 integrated reports themselves. Regression analyzes are applied to examine the associations between assurance, the disclosed connectivity of the capitals and information asymmetry.

The presence of an assurance statement in an integrated report significantly decreases information asymmetry. Surprisingly, assurance quality is not significantly associated with information asymmetry. However, an interaction analysis reveals that combining high assurance quality with high disclosed connectivity of the capitals allows a significant decrease in information asymmetry.

The paper demonstrates that the connectivity of the capitals of integrated reports and assurance quality are connected and together are associated with information asymmetry.

The results imply, both for report preparers and standard setters, that assurance quality is advantageous only when combined with disclosed connectivity of the capitals.

More information on non-financial information measured by the connectivity of the capitals of integrated reporting has an interaction effect together with assurance quality on information asymmetry.

This paper builds on a unique data set derived from the contents of integrated reports and accompanying assurance statements. Furthermore, it extends the integrated reporting literature by investigating the interaction between assurance quality and the disclosed connectivity of the capitals, which had not previously been examined in combination.

The purpose of this paper is to investigate how users perceive the quality of the assurance statement (AS) for sustainability reports (SR). As a complement, the paper also tests the validity of a previous model by evaluating whether the results of its statement of quality agree with the users’ perceptions.

A survey was conducted among 253 master-level business students and advanced undergraduate accounting students in two countries, Spain and the USA, as a proxy for users of SR. To capture their perceptions of quality, the participants were asked to evaluate a measure of quality based on previous research. A measure of quality developed previously was also tested.

An agreement between the students’ perception and the quality measure tested was found. This paper also encounters differences in perception between participants in the two countries studied as well as between accounting and non-accounting students.

The results have implications for regulators. In fact, the reform of ISAE3000 (IFAC) deals with the reporting quality.

This paper covers two gaps, quality of AS and business students’ approach toward social responsibility, by looking at how users–students perceive AS quality. The validation of a model to assess the quality of SR adds value to the existing literature in the field.