Voluntary sustainability reporting assurance in the European Union before the advent of the corporate sustainability reporting directive: The country and firm-level impact of Sustainable Development Goals

Drawing on institutional and signaling theories, this paper investigates country-and firm-level impact of Sustainable Development Goals (SDGs) on the European Union (EU) companies' decision to have sustainability reporting assured prior to the implementation of the Corporate Sustainability Reporting Directive (CSRD). The dataset consists of 960 companies based in the EU and covers 2020-2022. The total number of observations equals 2880. The research focuses on SDGs-related factors influencing companies' assurance decisions such as the countries' advancement in SDGs implementation represented by SDG SCORE and companies' efforts toward the SDGs achievement captured with SDG INDEX. The data are analyzed using descriptive statistics and the fixed effects regression model for panel data. The results of the study indicate that SDGs impact companies' assurance decisions on both levels. Larger companies tend to opt for assuring their sustainability reporting more frequently, while those operating in environmentally sensitive industries display greater hesitancy in this regard. The research findings suggest adding SDGs to the wide range of factors identified in previous literature as determinants of the differences in sustainability reporting assurance. Company managers should increase their efforts to achieve the SDGs, as this might promote the use of assurance. The involvement of government agencies, national accounting and auditing associations and standard setters in the implementation of the SDGs can be useful in facilitating the transition from voluntary to mandatory implementation of assurance under the new CSRD.