India’s ESG reporting landscape is entering a decisive phase.
From FY 2023–24, the Securities and Exchange Board of India (SEBI) introduced Business Responsibility and Sustainability Report – Core (BRSR Core) as an assurance-ready subset of the broader BRSR framework. The intent is clear: to move ESG reporting in India from narrative-driven disclosures to credible, comparable, and auditable data.
By FY 2026–27, reasonable assurance on BRSR Core will be mandatory for the top 1,000 listed companies by market capitalisation. This places India among the most rigorous ESG assurance regimes globally, both in scope and depth.
For business leaders, this is not a future compliance requirement. It is a near-term readiness challenge that demands action today.
BRSR Core: Nine ESG Attributes That Will Be Audited, Not Explained
BRSR Core is often misunderstood as a condensed version of BRSR. In reality, it is a materiality-driven, KPI-led framework explicitly designed for assurance.
BRSR Core consists of nine defined ESG attributes, each supported by multiple quantitative KPIs that are subject to assurance.
Environmental (3 Attributes)
1. Greenhouse Gas Emissions – Scope 1, Scope 2, and relevant Scope 3 emissions
2. Energy Management – Energy consumption, intensity, and efficiency
3. Water & Waste Management – Water withdrawal, discharge, and waste generation
Social (4 Attributes)
4. Workforce Composition & Stability – Employment structure, turnover, diversity
5. Occupational Health & Safety – Injuries, fatalities, safety systems
6. Diversity, Equity & Inclusion – Representation across gender and levels
7. Training & Skill Development – Coverage, hours, and capability building
Governance (2 Attributes)
8. Business Ethics & Anti-Corruption – Policies, incidents, prevention mechanisms
9. Board Composition & Oversight – Independence, diversity, and risk governance
These attributes provide stakeholders with a standardised, decision-useful view of ESG performance, moving well beyond policy statements or intent-based disclosures.
Reasonable Assurance: Why ESG Is Now an Audit Conversation
Reasonable assurance is the highest level currently prescribed for BRSR Core. It requires assurance providers to obtain sufficient and appropriate evidence to support ESG disclosures, similar in rigor to financial audits.
In practical terms, ESG data must be traceable to source records, measured consistently across periods, and independently verifiable using recognised assurance standards. This marks a clear shift from self-declared ESG reporting to auditor-confirmed information.
What Auditors Will Scrutinise in 2026
By 2026, auditors will focus not only on reported ESG metrics, but on the systems, controls, governance, and evidence behind every disclosure.
➢ Auditors will assess data governance and traceability, including clear data ownership across functions, complete documentation trails for KPIs, and internal controls that ensure accuracy before reporting.
➢ They will examine the consistency of methodologies and measurement discipline. Indicators must be measured consistently year-on-year using recognised methodologies such as the GHG Protocol. Unexplained changes in assumptions or boundaries may result in audit qualifications.
➢ Auditors will conduct assurance in line with recognised standards such as ISAE or SSAE 3000 for sustainability information and ISAE or SAE 3410 for greenhouse gas statements, ensuring global comparability.
➢ Governance and board oversight will also be scrutinised. Auditors will evaluate board-level approvals, integration of ESG risks into enterprise risk management, and senior leadership accountability for data quality.
Value Chain ESG Data: The Next Assurance Frontier
From FY 2025–26, BRSR Core introduces value chain ESG disclosures for the top 250 companies, with assurance requirements expected to follow.
This significantly expands the audit perimeter. Organisations will need to engage suppliers for upstream and downstream data, attribute ESG impacts based on business relationships, and validate third-party data as part of assurance processes.
Auditors will increasingly examine how supplier ESG data is collected, governed, and validated.
Strategic Implications for Business Leaders
BRSR Core assurance is not a procedural compliance exercise. It has direct strategic implications.
Assured ESG data enhances investor confidence and access to capital, particularly as global investors increasingly demand verified sustainability information.
Organisations that embed strong ESG data systems gain competitive differentiation through improved ESG ratings, fewer audit qualifications, and stronger risk visibility.
The rigor required for assurance often reveals operational gaps, offering leadership valuable insights to strengthen governance, controls, and performance management.
Preparing for 2026: Practical Readiness Actions
Organisations preparing effectively for assurance are establishing cross-functional ESG data ownership, maintaining structured evidence repositories, standardising measurement methodologies, engaging assurance providers early, and elevating ESG oversight at board and internal audit levels.
Early preparation reduces audit friction and ensures ESG disclosures withstand regulatory and investor scrutiny.
Conclusion
As BRSR Core assurance becomes mandatory by 2026, ESG reporting in India is transitioning from narrative disclosure to structured, auditable, and evidence-backed reporting.
Auditors will focus on data traceability, methodological consistency, and governance discipline behind every disclosed metric.
At Ecodrisil, BRSR reporting is designed with assurance at its foundation, enabling organisations to centralise ESG data, automate calculations, and maintain robust audit trails across BRSR Core KPIs. This ensures ESG assurance is embedded as an ongoing capability that strengthens credibility, stakeholder trust, and long-term value creation.