ESG Reporting Timeline in India: What Gets Filed When and Who Is Responsible for What
A regulatory reference guide for company secretaries, CFOs, and sustainability heads navigating SEBI's BRSR compliance calendar.
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Introduction
ESG reporting in India is no longer a single annual exercise appended to the annual report. It is a layered compliance calendar with different obligations applying to different cohorts of companies, different submission formats, and different evidentiary standards depending on where a company sits in the market capitalisation ranking.
The framework has also evolved rapidly. SEBI introduced the BRSR Core in July 2023, updated assurance terminology and eased value chain disclosure requirements via a March 2025 circular, and continues to expand scope through phased mandates. Most companies are still treating BRSR as an annual report attachment produced in Q4. The regulatory reality is more structured and more demanding than that.
This piece maps what gets filed when, who is in scope for what, and where internal ownership of each obligation typically sits. All timelines and thresholds referenced reflect SEBI's current framework as updated through March 2025.
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The Regulatory Architecture: Three Layers of Obligation
The first layer is the full BRSR disclosure. Under Regulation 34(2)(f) of SEBI LODR 2015, the top-1000 listed entities by market capitalisation must include a BRSR in their annual report, mandatory from FY2022-23. Market cap ranking is determined on average market cap from July 1 to December 31 each year. A critical compliance nuance under Regulation 3(2): once a company qualifies as a top-1000 entity from FY2021-22 onwards, it remains obligated to file BRSR in all subsequent years, even if its market cap subsequently falls below the threshold.
The second layer is BRSR Core. Introduced through SEBI Circular dated July 12, 2023, BRSR Core covers 49 KPIs across nine ESG attributes and is mandatory for the top-1000 from FY2023-24. Third-party assessment or assurance is phased in by cohort: top-150 from FY2023-24, top-250 from FY2024-25, top-500 from FY2025-26, and top-1000 from FY2026-27. SEBI's March 2025 circular replaced "reasonable assurance" with "assessment or assurance," giving companies the flexibility to choose either, per standards developed by the Industry Standards Forum comprising ASSOCHAM, CII, and FICCI in consultation with SEBI.
The third layer is value chain ESG disclosure. Originally required for the top-250 on a comply-or-explain basis from FY2024-25, the March 28, 2025 circular changed this to fully voluntary. The definition of value chain has been tightened to upstream and downstream partners individually contributing 2% or more of purchases or sales by value, subject to a 75% coverage cap. The voluntary status should be treated as a transition window. SEBI's intent remains mandatory value chain disclosure with assessment.
On submission format: BRSR must be filed with both BSE and NSE in PDF and XBRL formats on the same day as the annual report. The BRSR XBRL utilities on both exchanges are interoperable. Where BRSR Core assessment or assurance has been obtained, the certificate must be attached with the filing. BRSR may be provided as a link in the annual report rather than published in full, provided the page reference is explicitly stated.
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The Filing Calendar: What Happens When
Through the Financial Year: April to December
ESG data collection cannot be a year-end activity. For BRSR Core KPIs to meet assessment or assurance standards, data must be captured at source as it is generated like meter readings, HR records, production logs, water consumption, and waste disposal data need to flow continuously from facility level into a central governance record throughout the year. For companies in scope for BRSR Core assessment or assurance, the engagement should begin in Q3 (October to December). This allows time for scope discussion, internal controls testing, data readiness review, and sample testing before year-end data is finalised. Companies that initiate the engagement in February or March are compressing a process that requires structured access to source data across the year. For companies voluntarily reporting value chain ESG data, partner engagement and data collection should begin in Q2. Upstream and downstream partners individually contributing 2% or more of purchases or sales are the relevant scope. Building the data request, collecting responses, and validating them is a multi-month process.
Q4 and Year-End: January to March
The final quarter is when BRSR data is consolidated and prepared for disclosure across all nine NGRBC principles. BRSR Core KPIs require documented methodology for each metric; which emission factor was applied, how the boundary was defined, how estimates were handled where primary data was unavailable. Without this documentation, the assessment or assurance engagement cannot reach a conclusion. The assessment or assurance engagement should be substantially complete before board approval of the annual report. The certificate must accompany the BRSR filing. The audit committee should review the BRSR Core output and engagement scope before it reaches the board. Board sign-off on the annual report carries implicit endorsement of the ESG disclosures within it.
Post Year-End Filing: April to September
The annual report, with BRSR embedded or linked, is submitted to BSE and NSE (BRSR PDF and XBRL are filed on the same day). There is no separate BRSR filing deadline. Companies newly entering the top-1000 have until April 1 of the following financial year to comply, under the three-month transition provision from December 31. Revisions to BRSR XBRL and PDF submissions are permitted on exchange portals but should be treated as a last resort and must be accompanied by a covering letter explaining the change. Material revisions to BRSR Core KPIs after the assessment or assurance certificate has been issued require coordination with the provider.
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Who Is Responsible for What Internally?
Company Secretary
The company secretary is the primary compliance owner for BRSR as a regulatory filing. They ensure filing with BSE and NSE in PDF and XBRL on the correct date, coordinating on disclosure completeness, managing the assessment or assurance certificate attachment, and tracking SEBI circular changes that affect BRSR format or scope. The company secretary is also responsible for tracking the market cap ranking and confirming the correct BRSR Core assessment or assurance cohort.
CFO and Finance Function
Finance owns the data inputs underpinning BRSR Core intensity ratios; revenue, capex, wages paid including to women, and financial boundary definitions. As assessment or assurance engagements increasingly parallel the financial audit in rigour, CFO ownership of ESG data governance is becoming standard in companies with mature BRSR programmes. The CFO's sign-off on the link between BRSR disclosures and audited financials is a practical necessity.
Sustainability and ESG Team
The sustainability team owns data collection across all ESG KPIs like managing the data calendar, maintaining methodology documentation for each BRSR Core KPI, coordinating with facility and function owners, and liaising with the assessment or assurance provider. Where value chain data is voluntarily collected, the sustainability team manages partner engagement and validation. It is also responsible for tracking SEBI framework updates and assessing disclosure implications.
Operations and Facility Management
Operations and facility managers are the source owners for environmental data like energy, water, waste, and emissions at facility level. Without structured data flows from operations into the sustainability function, BRSR Core data quality will not meet assessment or assurance standards. This requires embedding data collection processes into operational management systems, not treating them as an annual request from the ESG team.
Audit Committee and Board
Under SEBI LODR, the board is responsible for the annual report within which BRSR is embedded. The audit committee should review the BRSR Core output and assessment or assurance scope before the annual report reaches the board. As the BRSR Core mandate extends to the full top-1000 by FY2026-27, audit committee engagement on ESG data governance will need to increase commensurately.
Assessment or Assurance Provider
The external provider (a chartered accountant or SEBI-registered ESG rating provider) applies ISF Industry Standards for BRSR Core verification. Per the March 2025 circular, providers must have relevant expertise across the KPIs being assessed and must be free from conflicts of interest, specifically, they must not sell products or provide consulting services to the entity being assessed. Scope and engagement terms should be agreed before Q4.
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Conclusion
SEBI's BRSR framework has been amended significantly since its introduction. Most recently it was done in March 2025, which introduced assessment as an alternative to assurance, eased value chain disclosure to voluntary, and updated the value chain definition. Companies navigating BRSR compliance need to track these changes actively, not assume the framework is static.
The compliance calendar demands year-round data governance, clearly assigned internal ownership across the company secretary, finance, sustainability, and operations functions, and forward planning on assessment or assurance engagement timelines. Companies that begin BRSR data collection and assessment preparation in Q3 will find the process significantly more manageable. ESG Astraa works with Indian listed companies to build BRSR-ready data governance frameworks and navigate the assessment or assurance process across BRSR Core KPIs.
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Frequently Asked Questions
When must BRSR be filed with the stock exchanges?
BRSR must be filed with BSE and NSE in both PDF and XBRL formats on the same day as the annual report submission. There is no separate BRSR filing deadline. It is co-filed with the annual report. Where BRSR Core assessment or assurance has been obtained, the certificate must be attached with the filing.
Which companies need BRSR Core assessment or assurance and from when?
BRSR Core assessment or assurance is mandatory for the top-150 listed companies from FY2023-24, top-250 from FY2024-25, top-500 from FY2025-26, and top-1000 from FY2026-27. Market capitalisation ranking is based on the average market cap from July 1 to December 31 of the preceding calendar year.
What changed in SEBI's March 2025 BRSR circular?
The March 28, 2025 SEBI circular made three significant changes: it replaced "reasonable assurance" with "assessment or assurance," giving companies the flexibility to choose either per ISF standards; it changed value chain ESG disclosure from comply-or-explain to fully voluntary; and it tightened the value chain definition to partners individually contributing 2% or more of purchases or sales by value.
Is value chain ESG disclosure mandatory for Indian listed companies?
As of the March 2025 SEBI circular, value chain ESG disclosure is fully voluntary. It was previously required on a comply-or-explain basis for the top-250 companies from FY2024-25. The regulatory direction remains toward mandatory disclosure. SEBI has indicated this is a transition window, not a permanent exemption. Companies should use the voluntary period to build the data collection infrastructure required.
Who can provide BRSR Core assessment or assurance?
SEBI permits both chartered accountants and SEBI-registered ESG rating providers to conduct BRSR Core assessment or assurance. Providers must apply the Industry Standards developed by the Industry Standards Forum in consultation with SEBI, must have relevant expertise across the KPIs being assessed, and must be free from conflicts of interest with the listed entity.
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