EarthJournal Research · BRSR Value Chain Disclosure

BRSR Value Chain Disclosure in 2026: Why Most of India’s Supplier ESG Data Stays Unmeasured

From FY2026, India’s top 1,000 listed companies must report ESG data across their value chains. The rule is now law — but the supplier data to back it up does not yet exist at the quality assurance demands.

From FY2026, the top 1,000 listed companies in India are required to report Environmental, Social and Governance (ESG) data for their value chains, not only for their own operations. The Securities and Exchange Board of India (SEBI) framework extends Business Responsibility and Sustainability Reporting (BRSR) to every supplier and customer that accounts for 2% or more of a company’s procurement or sales, scaling up to 75% of the value chain. Third-party assessment or assurance on that data follows in FY2026-27. This is the single largest expansion of BRSR value chain disclosure India has undertaken.

The harder problem sits underneath the rule itself. The suppliers now in scope are overwhelmingly unlisted, often informal, and in most cases have never measured a single ESG indicator in a form an auditor would accept. The disclosure is becoming mandatory faster than the data to support it is becoming available.

This article sets out what BRSR value chain disclosure now requires, why the value chain is where most environmental impact actually sits, why the supplier data does not yet exist at the quality assurance demands, and what closing that gap will take on the ground.

What BRSR value chain disclosure now requires

BRSR is SEBI’s mandatory ESG disclosure framework for the top 1,000 listed companies by market capitalisation, structured around the nine principles of the National Guidelines on Responsible Business Conduct (NGRBC). It moved corporate disclosure from a narrative format to a standardised, quantifiable one, with 140 reporting questions split across essential and leadership indicators.

The newer layer is BRSR Core, a focused set of key performance indicators across nine ESG attributes — covering greenhouse gas emissions, water, energy, waste, gender diversity, wages, inclusive development, customer fairness and business openness. Crucially, BRSR Core now reaches into the value chain. Companies must collect and disclose ESG information from upstream suppliers and downstream partners, then move that data through assurance.

The phasing matters. Listed-entity assurance has expanded in stages from the largest companies toward the full top 1,000, and value chain reporting applies from FY2026 with assessment or assurance from FY2026-27. The direction of travel is settled. The compliance burden moves outward from a company’s own gates into a supply base it does not own and has rarely measured.

The value chain is where the impact lives

To understand why this matters, start with where environmental impact actually concentrates. According to CDP, value chain emissions — classified as Scope 3 — account for between 70% and 90% of a company’s total emissions across most sectors. On average, companies report supply chain emissions roughly 26 times larger than their Scope 1 and Scope 2 emissions combined. A company’s own facilities are the small number. The chain beyond its ownership is the large one.

The disclosure record reflects how difficult this is to capture. Globally, only about 15% of companies report Scope 3 emissions at all. In India, 27% of the top 1,000 listed companies voluntarily reported Scope 3 for FY2024 — placing the country among early movers, but still leaving roughly three in four large companies without a systematic handle on value chain data they are now expected to disclose and assure.

For hard-to-abate and asset-heavy sectors, the concentration is even sharper. In capital goods and similar industries, the overwhelming majority of total emissions sit in a single downstream category. Any decarbonisation or disclosure strategy that stops at the factory fence addresses a minority of the real footprint.

India’s water and emissions reality makes supplier data material

Value chain ESG data is not an abstract compliance exercise in the Indian context — it maps onto genuine physical exposure. India ranks 13th among the world’s 17 countries facing extremely high baseline water stress, according to the World Resources Institute (WRI) Aqueduct Water Risk Atlas, and it holds more than three times the combined population of the other sixteen countries in that category.

A baseline water stress score above 80% — signalling that almost all available water is withdrawn each year — applies across large parts of the country. Northern India has seen groundwater decline at more than eight centimetres per year over recent decades, and government assessments have flagged groundwater over-exploitation in more than 1,100 of roughly 6,900 assessment units.

Crude, revenue-only normalisation hides this. Sound ESG measurement adjusts consumption for district-level water stress and normalises emissions by physical output as well as revenue, so that genuine efficiency is separated from the appearance of it. These are precisely the adjustments that listed-company filings sometimes blur — and that unlisted suppliers rarely capture at all.

The suppliers behind value chain disclosure are mostly unlisted

Here is the structural fact the market keeps stepping around. The listed universe is well served — rating agencies, index providers and ESG data vendors compete over the same 1,000 listed names. A large manufacturer’s supply base, however, runs to thousands of vendors, and only a handful of them are listed companies.

That remainder is the MSME economy. India is home to tens of millions of micro, small and medium enterprises, which contribute close to 30% of GDP, employ more than 110 million people, and account for around 45% of exports. Most still run procurement, inventory and compliance through spreadsheets, phone calls and long-standing relationships. They are not required to file BRSR unless they are themselves listed, so the obligation never reaches them directly — yet their environmental records are exactly what larger companies must now rely upon for Scope 3 and value chain disclosures.

The result is a mismatch. A sustainability head at a top-1,000 company is being asked to report assured ESG data on entities that no rating system has scored, that hold no reporting mandate, and that frequently have no measurement infrastructure at all.

Why supplier declarations will not pass assurance

The common first response is to send suppliers a questionnaire, collect their declarations, attach the responses and file. That approach will struggle once assurance arrives. Under reasonable assurance, auditors test traceable records, repeatability and control maturity over time.

A supplier declaration rests on memory and intent, which does not meet an audit-grade evidence standard. A one-time supplier audit captures a moment, not whether obligations are tracked and documented continuously across a reporting period.

Table: how different supplier evidence types perform against assurance requirements. Source: Earth5R analysis of BRSR Core assurance criteria.

The market understands the difficulty even where it has not solved it. In the Sustain 2026 procurement survey, 81% of procurement leaders said ESG factors influence purchasing decisions, yet 85% said finding sustainable suppliers is difficult, and only 17% of suppliers felt strongly encouraged by their customers to act. Organisations rate their own readiness highly while the verified supplier reality lags well behind that self-assessment.

The export angle: CBAM and the India–EU trade relationship

The pressure is not only domestic. With the India–EU Free Trade Agreement concluded in early 2026 and mechanisms such as the European Union’s Carbon Border Adjustment Mechanism (CBAM) raising the bar on embedded emissions, Indian exporters increasingly need defensible, verifiable data on the carbon and resource intensity of their inputs.

Unverified supplier data is no longer only a reporting weakness — it becomes a trade and market-access exposure, particularly for metals, chemicals and other carbon-intensive value chains where buyers abroad now ask for primary evidence rather than estimates.

The narrative-data divergence that cascades upward

There is a second-order risk that many boards have not yet priced. When a company publishes value chain numbers built on supplier self-reporting, it inherits those suppliers’ claims. Where a supplier’s narrative runs ahead of its measured reality, that divergence does not remain with the supplier — it flows into the buyer’s filing, its assurance scope and its reputation.

Earth5R built a metric to measure this divergence directly. The CvR Gap™ captures the distance between what a company claims and what its disclosed quantitative data actually supports, applied across 1,200+ NSE-listed companies for FY2023 to FY2025. The pattern is not marginal.

The cost of being wrong is also climbing. More than 400 environmental-claim enforcement actions had already been recorded globally during 2026, with regulators shifting their attention from broad sustainability strategy toward the specific wording and substantiation of claims. The risk is migrating from reputation toward compliance and liability.

Why ground-verified data is the missing layer

Two trends are reshaping the ESG data market at once. Satellite imagery and remote sensing are commoditising quickly, and desk-based research on listed filings is a crowded field with thin differentiation. What cannot be scraped, modelled from a distance, or self-declared away is verified ground evidence collected at a supplier’s actual operating site.

This is the gap Earth5R was built to close. Earth5R, a United Nations recognised environmental organisation operating across 65 countries, runs a field network spanning 150+ Indian cities, supported by a community of 2.5 million members and 2.4 billion ground-verified, geo-tagged environmental data points. That network sits exactly where the value chain disclosure gap is widest — among the unlisted, MSME and tier-2 suppliers that no desk-based provider can reach.

The two layers form a single capability. The field network supplies ground truth, and TERRA Score turns that evidence into a comparable, decision-ready measure of where a company or supplier actually stands. Its methodology is currently under review with Prof. Dan Esty and Dr. Zach Wendling at the Yale Center for Environmental Law and Policy — the team behind the Environmental Performance Index.

For value chain disclosure specifically, this means a corporate buyer can extend measurement beyond the roughly 30 listed names in a supply base to the hundreds or thousands of unlisted suppliers that carry most of the real exposure. Earth5R is also piloting TERRA-MSME, a right-sized sustainability assessment for unlisted small and medium suppliers — so value chain data can be built rather than estimated.

A practical roadmap for sustainability and procurement leaders

For companies preparing for value chain assurance, the useful work begins well ahead of the deadline, not after it. The sequence below moves from mapping exposure to building evidence that survives scrutiny.

Frequently asked questions

The bottom line

The numbers driving this shift are not going to ease. Scope 3 will remain the majority of the corporate footprint. Suppliers will remain mostly unlisted. Assurance will remain mandatory and will only widen. The variable companies can control is how early they begin measuring the part of their business they do not own — with evidence solid enough to survive assurance and scrutiny.

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