Sustainability Assurance Practices in Corporate Reporting

In recent decades companies have increasingly produced sustainability reports to communicate their environmental, social and governance performance to stakeholders. Sustainability assurance practices involve independent verification of non-financial information by external providers, aiming to enhance the credibility and comparability of disclosures. Assurance engagements range from limited procedures to comprehensive evaluations, and may follow international standards such as ISAE 3000 or emerging ESG frameworks. Firms’ decisions to obtain assurance are influenced by factors including regulatory requirements, investor expectations, corporate governance structures and the reputations of assurance providers. Assurance contributes to risk management, stakeholder trust and improved decision-making, and can influence access to finance, cost of capital and corporate reputation. As global regulatory and market pressures evolve, assurance of sustainability information is becoming integrated into broader reporting and audit processes, signalling a nascent shift towards more standardised, quality-focused reporting ecosystems.

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Sustainability Assurance Practices in Corporate Reporting publication trend

The graph below shows the total number of articles in sustainability assurance practices in corporate reporting across all publications each year (not limited to Nature Index journals).

Technical terms

Assurance engagement: A formal process in which an independent party evaluates the reliability of non-financial information in corporate reports.

Limited assurance: A moderate level of assurance involving inquiry and analytical procedures, offering a negative assurance opinion on the absence of material misstatements.

Reasonable assurance: A higher level of assurance involving detailed testing and risk assessment, leading to a positive assurance opinion on the accuracy of disclosures.

Extended external reporting (EER): Corporate disclosures that go beyond financial statements to include environmental, social and governance data.

ISAE 3000: An international standard for assurance engagements other than audits or reviews of historical financial information.

References

1. Research on extended external reporting assurance: An update on recent developments. Journal of International Financial Management and Accounting (2024).
2. Impact of disclosure and assurance quality of corporate sustainability reports on access to finance. Corporate Social Responsibility and Environmental Management (2019).
3. Sustainability assurance practices: a systematic review and future research agenda. Environmental Science and Pollution Research (2021).
4. Board committees and non-financial information assurance services. Journal of Management and Governance (2021).
5. The Current State and Future Implications of Environmental, Social, and Governance Assurance. Current Issues in Auditing (2023).