Environmental, Social and Governance (ESG) reporting in India is becoming more data-driven, measurable and subject to greater scrutiny. For large listed enterprises, sustainability reporting is no longer limited to describing environmental initiatives or corporate social responsibility programmes. Organisations increasingly need reliable data, clearly defined Key Performance Indicators (KPIs), documented calculation methods and evidence capable of supporting independent review.
BRSR Core sits at the centre of this transition. It focuses on a defined subset of critical ESG indicators within the broader Business Responsibility and Sustainability Report (BRSR), with an emphasis on comparability, reliability and assessment or assurance.
For enterprises, successful implementation depends less on preparing the final report and more on building the data, ownership, controls and evidence infrastructure required throughout the year.
What Is BRSR Core?
BRSR Core is a focused subset of the broader BRSR framework containing key ESG metrics across nine attributes. It is designed to improve the reliability and comparability of sustainability information by requiring covered listed entities to obtain assessment or assurance over specified disclosures according to SEBI’s phased applicability framework.
The broader BRSR requires the top 1,000 listed entities by market capitalisation to disclose information on environmental, social and governance performance. BRSR Core narrows attention to critical metrics where consistent measurement and stronger verification can improve confidence in ESG information.
This distinction is important.
BRSR is the comprehensive sustainability reporting framework.
BRSR Core is the focused set of ESG metrics within that framework for which the regulatory structure places additional emphasis on assessment or assurance.
Why BRSR Core Matters to Enterprises
ESG reporting often brings together information from systems that were never originally designed for sustainability reporting.
Environmental data may come from:
- Utility bills
- Manufacturing systems
- Energy meters
- Waste-management vendors
- Facility records
Social data may come from:
- HR platforms
- Payroll
- Health and safety systems
- POSH records
- Procurement information
Governance data may depend on:
- Financial statements
- Related-party registers
- Vendor records
- Customer information
- Cybersecurity incidents
The challenge is therefore not simply producing a report. Organisations need to ensure that the figures disclosed can be traced to reliable sources and reproduced using documented calculation methods.
That is where BRSR Core changes the reporting conversation from “What should we disclose?” to “Can we demonstrate how this number was produced?”
Who Does BRSR Core Apply To?
The framework has followed a phased glide path based on market capitalisation.
The original implementation schedule covered:
| Financial Year | BRSR Core Coverage |
|---|---|
| FY 2023–24 | Top 150 listed entities |
| FY 2024–25 | Top 250 listed entities |
| FY 2025–26 | Top 500 listed entities |
| FY 2026–27 | Top 1,000 listed entities |
SEBI subsequently introduced flexibility by allowing covered listed entities to obtain either assessment or assurance of the specified BRSR Core parameters rather than restricting the framework to the earlier assurance terminology. As of FY 2026–27, the glide path reaches the top 1,000 listed entities.
Enterprises should verify their current applicability based on the prevailing SEBI requirements and market-capitalisation methodology rather than relying on an old implementation calendar.
The Nine ESG Attributes in BRSR Core
BRSR Core organises its key metrics under nine ESG attributes.
These are:
- Greenhouse Gas (GHG) footprint
- Water footprint
- Energy footprint
- Circularity and waste management
- Employee well-being and safety
- Gender diversity in business
- Inclusive development
- Fairness in engaging with customers and suppliers
- Openness of business
These attributes intentionally extend beyond conventional climate reporting. They connect environmental performance with workforce practices, supplier relationships, customer risk and governance.
1. Greenhouse Gas Footprint
GHG reporting is one of the most visible areas of ESG measurement.
BRSR Core includes measures relating to Scope 1 and Scope 2 greenhouse-gas emissions and associated intensity ratios.
For reporting teams, the real challenge is often assembling the inputs.
These may include:
- Diesel and other fuel consumption
- Purchased electricity
- Purchased steam or cooling
- Emission factors
- Process emissions
- Fugitive emissions
- Operational output
- Revenue data
A reliable reporting model should document which source provides each input, which emission factor is used and who approves changes in methodology.
2. Water Footprint
Water reporting includes consumption, discharge and intensity measures.
Enterprises with multiple facilities may find that water data varies significantly in quality. Some sites may use calibrated meters, while others depend on invoices, tanker records or estimated consumption.
BRSR Core reporting therefore requires more than collecting a consolidated annual number.
Organisations should establish:
- Facility-level ownership
- Consistent measurement units
- Water-source classification
- Treatment and discharge records
- Reconciliation controls
- Evidence retention
The objective should be to make consolidated water information traceable back to operational records.
3. Energy Footprint
Energy data can include renewable and non-renewable consumption as well as energy-intensity measures.
Organisations should distinguish between energy that is purchased, generated and consumed to avoid double counting.
A robust energy-data process may connect:
- Electricity bills
- Generator-fuel records
- Renewable-energy certificates
- Facility meters
- Production records
- Finance data
Energy reporting can therefore require collaboration between facility management, finance, sustainability and operations teams rather than ownership by a single ESG function.
4. Circularity and Waste Management
Waste information is particularly challenging because different business units may use different classifications and external disposal vendors.
BRSR Core covers multiple categories of waste and the way waste is recovered or disposed of.
A reporting-ready process should establish:
- Waste category
- Quantity
- Unit of measurement
- Source facility
- Recovery method
- Disposal method
- Vendor evidence
- Reporting period
Waste certificates and vendor records should also be retained when they support disclosed figures.
5. Employee Well-Being and Safety
BRSR Core also brings social indicators into the reporting-control environment.
Relevant measures include expenditure towards employee and worker well-being and safety-related information such as Lost Time Injury Frequency Rate (LTIFR), fatalities and permanent disabilities.
This creates data dependencies across:
- HR
- Payroll
- Insurance
- Occupational health and safety
- Operations
- Contractor-management systems
Companies should define whether contractor workforce information is captured consistently across locations and whether incident data reconciles with internal safety records.
6. Gender Diversity in Business
Gender-related metrics include information such as wages paid to women as a percentage of total wages and POSH-related complaints.
These disclosures may require reconciliation between HR master data, payroll information and compliance records.
A common reporting risk is inconsistent employee classification. Permanent employees, workers, contractors and other workforce groups may be captured differently across systems.
Enterprises should establish common definitions before calculating consolidated indicators.
7. Inclusive Development
BRSR Core also considers how enterprise activity contributes to wider economic participation.
Relevant measures include sourcing from Micro, Small and Medium Enterprises (MSMEs) or small producers and employment-related indicators connected with smaller towns.
This means procurement systems need to store reliable supplier classifications rather than trying to reconstruct the information at reporting time.
Similarly, HR data may need location classifications that are consistent across the organisation.
8. Fairness in Engaging with Customers and Suppliers
This attribute connects ESG reporting directly with customer risk and supplier behaviour.
Metrics include customer-data breach information and accounts-payable days.
The data may therefore depend on:
- Cybersecurity incident records
- Customer databases
- Accounts payable
- Procurement
- Financial statements
This demonstrates why ESG reporting increasingly overlaps with finance, IT, cybersecurity and governance functions.
9. Openness of Business
Openness of business focuses on concentration and related-party dimensions of commercial activity.
Relevant information includes relationships involving purchases, sales, loans, advances and investments with related parties and other business counterparties.
Finance and governance teams should ensure that BRSR Core calculations are aligned with underlying financial information and related-party records.
This is an area where consistency between ESG and financial reporting becomes particularly important.
BRSR Core Data Readiness: What Enterprises Need
The strongest BRSR Core programmes begin with data architecture rather than report drafting.
Each KPI should have a documented control record containing:
| Data Requirement | What Should Be Defined |
|---|---|
| KPI definition | Exact meaning of the metric |
| Data owner | Function responsible for the source information |
| Source system | System or document providing the data |
| Frequency | Monthly, quarterly or annual collection |
| Calculation | Formula and approved methodology |
| Evidence | Documents supporting the result |
| Reviewer | Person responsible for validation |
| Exceptions | Process for resolving unusual values |
| Approval | Final sign-off responsibility |
This creates repeatability between reporting periods.
Why ESG Data Lineage Is Critical
Data lineage means being able to trace a reported figure back through every stage of its calculation.
Suppose an enterprise discloses a group-level GHG intensity metric.
A reviewer should be able to determine:
- Which facilities contributed data
- What energy or fuel records were used
- Which emission factors were applied
- Which entities were included
- What revenue or operational denominator was used
- Which adjustments were made
- Who reviewed the calculation
- What evidence supports the final number
If this chain cannot be reconstructed, the reporting process may struggle during assessment or assurance.
Move ESG Controls Closer to the Source
A common mistake is waiting until year-end to identify ESG data problems.
Instead, organisations should move controls closer to the point where information originates.
For example:
Monthly
- Energy and fuel reconciliation
- Water-data validation
- Waste-certificate collection
- Incident tracking
Quarterly
- KPI trend review
- Exception analysis
- Missing-data follow-up
- Management review
Year-end
- Consolidation
- Final reconciliation
- Evidence review
- Assessment or assurance support
- Disclosure approval
Continuous data discipline reduces the amount of correction required during the annual reporting cycle.
Assessment or Assurance Readiness
The March 2025 regulatory changes introduced the ability for listed entities to use either assessment or assurance for BRSR Core under the applicable framework. The assessment or assurance provider must have appropriate expertise, and conflict-of-interest safeguards remain relevant.
Enterprises should therefore prepare for external scrutiny by maintaining:
- Clear methodologies
- Source evidence
- Calculation workpapers
- Approvals
- Change logs
- Reconciliation records
- Explanations for estimates
- Documentation for unusual movements
The reporting team should be able to answer not only what was reported but how and why it was calculated.
What About Value-Chain ESG Disclosures?
Value-chain reporting has also evolved.
Under the revised framework, ESG disclosures for the value chain are voluntary for the top 250 listed entities from FY 2025–26. Voluntary assessment or assurance of those value-chain disclosures applies from FY 2026–27.
The current framework identifies relevant upstream and downstream partners based on individual contribution to purchases or sales, with additional flexibility around overall coverage.
Even where value-chain disclosure is voluntary, enterprises may benefit from improving supplier ESG-data collection because supplier information increasingly influences emissions measurement, procurement decisions and stakeholder expectations.
Common BRSR Core Reporting Weaknesses
Enterprises should watch for several recurring problems:
- KPI definitions that differ between business units
- Source data retained only in spreadsheets
- Missing facility-level evidence
- Manual calculation changes without approval
- Inconsistent units of measurement
- Unreconciled ESG and financial data
- Weak supplier classifications
- Year-end data collection instead of continuous monitoring
- Lack of ownership for individual KPIs
- Estimates without documented methodology
- Narrative statements that do not match reported metrics
These issues increase remediation effort and can weaken confidence in the final report.
A Practical BRSR Core Readiness Roadmap
Step 1: Confirm Applicability
Determine the organisation’s current BRSR and BRSR Core requirements based on the prevailing regulatory framework.
Step 2: Map Every KPI
Create a data dictionary covering definitions, formulas, sources, owners and reporting boundaries.
Step 3: Identify Control Gaps
Test whether every reported metric can be supported by complete and reliable evidence.
Step 4: Standardise Data Collection
Replace inconsistent templates with controlled reporting formats and common definitions.
Step 5: Introduce Validation
Use reconciliations, variance thresholds and exception checks before consolidation.
Step 6: Create Evidence Repositories
Maintain supporting documents in a structured location linked to each KPI.
Step 7: Conduct a Readiness Review
Perform a dry run before the final reporting cycle and identify areas likely to create assessment or assurance issues.
How MindBridge Supports BRSR Core and ESG Reporting Readiness
BRSR Core readiness requires coordination between ESG teams, finance, HR, procurement, operations, cybersecurity and governance functions.
MindBridge’s AI-enabled ESG services support organisations with structured ESG monitoring, sustainability data management, emissions tracking, social and governance analytics, reporting automation and transparent ESG reporting.
A technology-enabled operating model can help enterprises collect information more consistently, identify data exceptions earlier and maintain stronger traceability between source data and reported KPIs.
The objective should not be simply to complete BRSR reporting. It should be to create an ESG data environment that remains reliable throughout the year and is better prepared for management review, regulatory reporting and independent assessment or assurance.
Frequently Asked Questions
1.What is BRSR Core?
BRSR Core is a focused subset of the Business Responsibility and Sustainability Report containing specified ESG KPIs across nine attributes. It is designed to strengthen the reliability and comparability of critical sustainability disclosures and is subject to phased assessment or assurance requirements for covered listed entities.
2.How is BRSR Core different from BRSR?
BRSR is the broader sustainability-reporting framework applicable to the top 1,000 listed entities. BRSR Core concentrates on selected critical ESG indicators within that broader framework and introduces additional assessment or assurance expectations for covered companies.
3.What are the main ESG areas covered under BRSR Core?
The nine attributes cover GHG emissions, water, energy, waste and circularity, employee well-being and safety, gender diversity, inclusive development, fairness in customer and supplier engagement, and openness of business.
4.Is value-chain reporting mandatory under BRSR Core?
Under the revised framework, value-chain ESG disclosures are voluntary for the top 250 listed entities from FY 2025–26, with assessment or assurance of those disclosures also voluntary from FY 2026–27. Enterprises should continue monitoring future SEBI changes to these requirements.
5.How should companies prepare for BRSR Core reporting?
Companies should begin by establishing KPI definitions, identifying data owners, documenting source systems, standardising calculations, introducing validation controls and maintaining evidence. A readiness review before the final reporting cycle can identify gaps before they affect assessment or assurance.
Conclusion
BRSR Core is pushing enterprise ESG reporting towards greater measurement discipline, traceability and accountability.
The framework connects sustainability reporting with finance, HR, procurement, operations, cybersecurity and governance data. As a result, successful implementation cannot depend on the ESG team collecting spreadsheets shortly before the annual report is prepared.
Enterprises need controlled KPI definitions, reliable source information, documented methodologies, consistent calculations, accountable data owners and evidence capable of supporting review.
The organisations best prepared for BRSR Core will be those that treat ESG information with the same discipline applied to other important enterprise data. By building that foundation throughout the year, businesses can improve reporting quality, reduce year-end remediation and strengthen readiness for assessment or assurance.
