PurposeThis study assesses the impact of environmental, social and governance (ESG) certification on capital structure decisions considering the COVID-19 pandemic.Design/methodology/approachThe study utilizes the annual Asset-4 and Datastream data of Thomson Reuters Eikon for non-financial firms in member states of the Organization of Islamic Cooperation (OIC). Firm-fixed effects are used to avoid unobserved heterogeneity.FindingsFirms with higher corporate sustainability have a higher leverage ratio. The positive impact of ESG scores on book leverage became more significant during the COVID-19 pandemic. These findings imply that ESG activities might serve as a signalling tool, especially considering the pandemic: ESG activities mitigate financial constraints when they are most pronounced and impactful.Practical implicationsFirms should invest in ESG activities to alleviate financial constraints. Researchers and practitioners are encouraged to explore how ESG and macro-specific factors jointly affect debt financing. Policymakers should incentivize ESG investment to reduce agency conflicts. Regulators in OIC countries should support firms that are encountering obstacles in obtaining ESG certification.Originality/valueTo date, the role of ESG investing in capital structure policy by considering the recent pandemic has not been assessed in OIC countries.
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