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This study aims to investigate the relationship between audit quality and value relevance and subsequently ascertain the moderating effect of business ethics on integrated reporting (IR)–value relevance.

This study applied linear regressions with panel data using the Thomson Reuters ASSET4 database from European countries to analyse data of 510 companies belonging to the environmental, social and governance (ESG) index between 2010 and 2022.

A significant positive relationship was found between audit quality and value relevance. The results also suggest that IR has significant explanatory power on value relevance, and that business ethics moderate the relationship between IR and value relevance in European ESG firms.

Managers will see IR, business ethics and audit as a business strategy with incremental market value. In this regard, this study tried to provide insights and managerial solutions for managers of international companies to improve their strategy by drawing on the social, moral and business ethics approach. This finding will improve the informational relevance for investment opportunities, thus resulting in improved business performance.

To the best of the author’s knowledge, this is the first study to investigate the moderating role of business ethics in the relationship between IR and value relevance. This paper fulfils a recognised need to study the influence of audit quality on investor decisions. Furthermore, the contribution of this study could be observed in the fact that the market value analysis differs between the contractual and the business ethics approaches. Also, including a moderating variable in the explanation and determination of value relevance remains somewhat underexplored.

This paper aims to investigate the effect of audit quality and environmental auditing on integrated reporting and the effect of environmental auditing on audit quality.

Data was collected from a sample of 300 international companies during the period 2010–2019. The author collected the data from the Thomson Reuters Eikon database, sustainability reports and annual reports. A multiple regression analysis was performed to test the hypotheses.

The finding of this study confirms a positive and significant relationship between audit quality and integrated reporting. It is also found that environmental auditing has a positive and significant effect on integrated reporting. Thus, this study found a positive and significant relationship between environmental auditing and audit quality.

The findings in this paper identify strategies for improving integrated reporting as a crucial element in the processing of financial and nonfinancial information, to help managers and investors and shareholders take a long-term perspective. Therefore, the results encourage companies to invest in economic, environmental and social aspects. This enables accounting professionals, stock exchange authorities and users of environmental and social information to be aware of the factors associated with environmental reporting, to improve the efficiency of those producing the audit service.

The originality of this study lies in its consideration of a particular aspect of auditing, namely, environmental auditing. However, despite the large body of research on auditing and integrated reporting, to the best of the author’s knowledge, this is the first study to examine the relationship between environmental auditing and integrated reporting. Furthermore, in this research, the author has emphasized the importance of the role played by environmental auditing on audit quality. This design has been neglected in previous studies. Finally, the choice of the field of investigation for the reliability of the data used and the generalization of the results obtained, enables us to make important contributions to the user of the information.