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This paper aims to examine the influence of sustainability assurance report format (separate versus combined with financial information assurance) and level (limited versus reasonable) on nonprofessional investors’ judgments.

This study uses a 2 × 2 between-participants experiment with 436 US nonprofessional investors. The authors manipulate sustainability assurance report format and level to identify differences in judgments of information credibility, investment desirability and investment amount.

This study finds that sustainability assurance level influences participants’ judgments only when the financial and sustainability assurance reports are presented separately. Specifically, participants assess sustainability performance information as more credible and make higher investment judgments when presented with a separate limited, as opposed to reasonable, assurance sustainability report.

The International Auditing and Assurance Standards Board expressed concerns regarding whether assurance reports accompanying emerging forms of extended external reporting (EER) effectively communicate the level of assurance provided by the independent practitioner. The result that assurance level does not influence investor judgments in the combined reporting format appears contrary to the idea that integrated reporting should provide connectivity between financial and sustainability information. The finding that investors make higher investment and credibility judgments with limited assurance is inconsistent with the intent of sustainability assurance professional guidance and recent research results. Together, the findings suggest that investors may not be able to distinguish between differing levels of sustainability assurance when this information is presented in a combined report format.

Standard setters should consider how sustainability assurance report format and assurance level impact nonprofessional investor judgments.

Research on the effects of EER assurance report format is sparse. The results indicate that even slight changes in assurance report wording may cause investors to perceive that a limited assurance report conveys a higher assurance level than a reasonable assurance report.

With the growing attention around carbon emissions disclosure, the demand for external carbon assurance on emissions reports has been increasing by stakeholders as it provides additional credibility and confidence. This study investigates the association between the higher level of external carbon assurance and improvement in a firm's carbon emissions. It provides an understanding of corporate incentives for obtaining a higher level of carbon assurance, particularly in relation to carbon performance enhancements.

Data are collected from 170 US companies for the period 2012–2017 and are analysed using a change analysis. Generalised method of moment (GMM) is used to address endogeneity.

Following the rationales taken by legitimacy and “outside-in” management views, the findings reveal that a higher level of carbon assurance (i.e. reasonable assurance) marginally improves firms' carbon performance (i.e. reported carbon emissions). This is consistent with “outside-in” management view suggesting that a higher level of assurance could be utilised as a tool for accessing more information about stakeholders' needs and concerns, which can be useful in enhancing carbon performance.

The findings are generalisable to US firms and may not extend to other contexts.

The implication of this study for companies is that a high level of sustainability assurance is a useful tool to access detailed information about stakeholder concerns, of which internalisation can help to marginally improve carbon performance. For policymakers, the insights into and enhanced understanding of the incentives for obtaining carbon assurance can help policymakers to develop effective policies and initiatives for carbon assurance. Considering the possible improvements in carbon performance when obtaining a high level of sustainability verification, governments need to consider mandating carbon assurance.

This study extends the existing studies of assurance in sustainability context as well as in carbon context by explaining why companies voluntarily get expensive external verification (i.e. higher level of assurance) of their carbon emissions disclosure. This study responds to calls in the literature for empirical research investigating the association between environmental performance and external assurance with a focus on level of assurance.

1. A higher level of carbon assurance Marginally improves firms' carbon performance.

2. Corporate incentives to obtain higher level of carbon assurance is beyond seeking legitimacy.

3. Higher level of assurance is a useful tool for accessing more information about stakeholders' concerns.

4. Consistent with “ouside-in”management view, companies internalise stakeholders' concerns to marginally improve performance.

A higher level of carbon assurance Marginally improves firms' carbon performance.

Corporate incentives to obtain higher level of carbon assurance is beyond seeking legitimacy.

Higher level of assurance is a useful tool for accessing more information about stakeholders' concerns.

Consistent with “ouside-in”management view, companies internalise stakeholders' concerns to marginally improve performance.

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 aims to examine the processes of sustainability reporting assurance (SRA) and the influence they have on shaping perception from disclosures. Given the evidence of inconsistencies and ambiguities in assurance processes, this paper examines how legitimacy is attained and maintained at different stages of SRA.

Evidence collected from 23 semi-structured interviews with assurance providers (APs), consultants, professionals and non-governmental organisations (NGOs) (non-APs) was used to conduct a thematic analysis from the perspectives of interviewees.

APs and non-APs are united in recognising the value of SRA, although, perspectives on transparency between the two groups differ. Experience and industry knowledge are essential to SRA delivery with non-APs preferring accounting APs. Nevertheless, non-APs are concerned about the role of companies in deciding assurance scope, as it can affect scrutiny. APs favour data accuracy (as opposed to data relevance) assurance due to team dynamics and internal review influences, with the latter also restricting assurance innovation. APs are interested in accessing better evidence and stakeholder engagement evaluations. Providing advisory services was not rejected by all APs. The perspectives of APs and non-APs demonstrate how progress in SRA has gained pragmatic legitimacy with noticeable gaps that serve to undermine attainment of moral legitimacy.

SRA is a developing practice that will adopt changes as it continues to mature; some of these changes could impact findings in this research. General perspectives on SRA were sought from interviewees, this affected the ability for an in-depth focus on any of the range of interesting SRA issues that arose over the course of the research. Interviews were conducted with relevant parties in the SRA space that operate in the UK. Perspectives from parties outside the UK were not solicited.

Companies make an important decision to commission SRA. Findings in this research have highlighted specific non-APs issues of concern that can be useful in structuring operations and reporting regimes to facilitate assurance procedures. The findings will also be helpful to APs as they can direct more emphasis on stakeholder concerns towards demonstrating greater stakeholder accountability. Regulatory and standard setters can enact appropriate policies that can potentially drive the practice forward for assessment of cognitive legitimacy.

The findings provide relevant account of stakeholder voices on the quality of corporate disclosures that has a direct effect on the wellbeing of communities and sustainability of societies. Collective stakeholder input on expectations can shape sustainability discourse.

This research demonstrates the applicability of financial audit quality indicators in SRA processes, extends the debate around the effectiveness of new audit fields and highlights the challenges of maintaining legitimacy with different audiences.

The current study aims to analyze the role of International Federation of Accountants (IFAC) in sustainability issues and its impact on the attitude of practitioners (auditors) in industrial companies. The current study relies on the analytical method, one of the tools of the inductive approach, by examining the literature of researchers, international and local organizations, publications, series, alerts, and topics dealt with by the IFAC, as well as reviewing studies, theoretical and applied research, periodicals, books, and statistics. And specialized publications for this subject, which is related to other sciences – such as – environmental science, economic, and political sciences. The study reached many results, the most important of which are: (1) The first half of the current decade has seen high interest from the IFAC, has led to the issuance of International Auditing and Assurance Standards Board (IAASB) international standard on assurance engagements 3410, (GHG) Statements. (2) Sustainability has become important to a growing number of enterprises, and may have a significant influence, in certain cases, the financial statements, also became the sustainability of the topics under increasing attention from users of financial statements. Thus, the financial statements will need a practitioner to take into consideration sustainability issues and a private greenhouse gas when auditing the financial statements. This study is distinguished by analyzing the role of the IFAC and the IAASB for the period from 1998 to 2023 regarding sustainability issues.

The purpose of this paper is to synthesize insights from the emerging work in accounting on greenwashing and sustainability assurance and propose an agenda for future research in this area.

This article offers an original analysis of papers published on greenwashing and sustainability assurance research in the field of accounting. It adopts a systematic literature review and a narrative approach to analyse the dominant themes and key findings in this new and rapidly evolving field. From this overview, specific avenues for future research are identified.

In the past few years there has been a substantial spike in concern relating to greenwashing among academics, practitioners, regulators and society. This growing concern has only partly been reflected in the research literature. To date, research has primarily focused on: (1) the characteristics of firms adopting sustainability assurance, (2) the challenges facing sustainability auditors, (3) the development of appropriate assurance standards and regulations, and (4) capital market responses to greenwashing and sustainability auditing/assurance. Three key future research issues with respect to greenwashing are identified: (1) the future of standard-setter attempts to regulate greenwashing, (2) professional jockeying in sustainability reporting assurance, and (3) capital market opportunities and challenges relating to greenwashing and assurance.

Despite the profound economic and reputational impact of greenwashing and the rapid development of sustainability assurance services, research in accounting remains fragmented and emergent. This review identifies avenues offering considerable scope for inter-disciplinarity and bridging the divide between academia and practice.

This paper aims to analyze what Samarco and Brazilian magazines speak and say about Mariana’s environmental crime. Discover their doxa in this subject. Interpret the speakings, sayings and doxas through the theories of the treadmills of production, crime and law.

It is a qualitative and documental research and a narrative analysis. Regarding the documents: 45 were from public authorities, 14 from Samarco Mineração S.A. and 73 from Brazilian magazines. Theoretically, the authors resorted to Bourdieusian sociology (speaking, saying and doxa) and the treadmills of production, crime and law theories.

Samarco: speaking – mission statements; saying – detailed information and economic and financial concerns; doxa – assistance discourse. Brazilian magazines: speaking – external agents; saying – agreements; doxa – attribution, aggravations, historical facts, impacts and protests.

The absence of discussions that addressed this fatality, with its respective consequences, from an agenda that exposed and denounced how it exacerbated race, class and gender inequalities.

Regarding Mariana’s environmental crime: Samarco Mineração S.A. speaks and says through the treadmill of production theory and supports its doxa through the treadmill of crime theory, and Brazilian magazines speak and say through the treadmill of law theory and support their doxa through the treadmill of crime theory.

To provoke reflections on the relationship between the mining companies and the communities where they settle to develop their productive activities.

Concerning environmental crime in perspective, submit it to a theoretical interpretation based on sociological references, approach it in a debate linked to environmental criminology, and describe it through narratives exposed by the guilty company and by Brazilian magazines with high circulation.

There is a growing interest in how firms respond to environmental degradation and societal challenges. Firms respond through their sustainability reports, but assurance of the reports gives confidence to the stakeholders. This study aims to identify the main research development in sustainability assurance which is rising in global studies.

This study uses a bibliometric analysis to assess the global trend in sustainability assurance studies. The methodology is based on descriptive, performance and science mapping. The set is based on 655 documents from the Scopus database, covering the period from 2005 to 2022.

The findings from the study suggest that sustainability studies are relevant, and the researcher's examination of the domain has dramatically increased from 2014 to date. This is due to the rise in the concerns expressed by stakeholders in satisfying themselves about the firm's responsibility to the Sustainable Development Agenda 2030. The findings also show that most research on sustainability assurance is from Spain, the USA, the United Kingdom (UK) and Australia. However, the UK has the most collaboration in terms of co-authorship. It is suggestive that the UK has more links than Spain, which is the most productive country with more publications. This may be attributed to the influx of more international students completing a second and third degree in the UK. The study highlights intellectual foundations and emerging trends and outlines avenues for future studies.

This study is limited to the data obtained from the Scopus database.

This study is the first bibliometric study of the sustainability assurance domain.

This study examines how assurors make sense of sustainability assurance (SA) work and how interactions with assurance team members and clients shape assurors’ sensemaking and their actual SA work.

To obtain detailed accounts of how SA work occurs on the ground, this study explores three SA engagements by interviewing the main actors involved, both at the client firms and at their Big Four assurance providers.

Individual assurors’ (i.e. partners and other team members) sensemaking of SA work results in the crafting of their logics of action (LoAs), that is, their meanings about the objectives of SA work and how to conduct it. Without organizational socialization, team members may not arrive at shared meanings and deviate from the team-wide assurance approach. To fulfill their objectives for SA work, assurors may engage in socialization with clients or assume a temporary role. Yet, the role negotiations taking place in the shadows of the scope negotiations determine their default role during the engagement.

Two options are available to help SA statement users gauge the relevance of SA work: either displaying the SA work performed or making it more uniform.

This study theoretically grounds how assurors make sense of SA work and documents how (the lack of) professional socialization, organizational socialization and socialization of frequent interaction partners at the client shape actual SA work. Thereby, it unravels the SA work concealed behind SA statements.