How Sustainability Reporting Helps Win Global Customers

Six months into the Carbon Border Adjustment Mechanism‘s definitive regime, EU importers of iron, steel, aluminium, cement, and fertilisers are reporting the carbon emissions embedded in what they buy. If their Indian supplier cannot provide verified emissions data, the importer falls back on default values, and those defaults are usually more expensive than real numbers. Which means an Indian exporter with credible environmental reporting is now literally cheaper to buy from than a competitor without it.

This is the new shape of global trade. Sustainability reporting has moved from the annual report to the purchase order. We see it in our own client work at Nirmal Vasundhara. The manufacturers winning new international contracts are rarely the ones with the glossiest sustainability brochure. They are the ones who can answer a buyer’s data request in two weeks with numbers that survive verification.

This guide explains why global customers now ask for your sustainability data, which sustainability reporting standards they reference, what their questionnaires actually contain, and how a supplier in India converts reporting capability into won business.

Why Your Buyers Are Asking for This Data

Global buyers are not asking for sustainability reports out of goodwill. They are passing down obligations they carry themselves. Five forces drive the questionnaires landing in Indian inboxes.

European corporate sustainability reporting rules. The EU’s Corporate Sustainability Reporting Directive requires large companies to disclose sustainability information, including material information about their value chains. The scope of these rules was narrowed sharply this year through the EU’s Omnibus Directive, which entered into force on 18 March 2026 and raised the threshold to companies with more than 1,000 employees and over 450 million euros in annual turnover. Read that carefully before assuming the pressure is off. The companies still in scope are precisely the large retailers, automotive groups, and consumer brands that Indian exporters supply. Their reporting obligation covers their supply chain, so their supply chain gets the questionnaire. The EU has also published a voluntary reporting standard for smaller companies, called VSME, and large buyers are adopting it as the template for what they ask suppliers.

Carbon border rules. CBAM’s definitive regime has been running since 1 January 2026. EU importers of covered goods above the 50-tonne threshold each year must hold authorised declarant status, report embedded emissions annually, and from February 2027 must surrender certificates priced against the EU carbon market, covering their 2026 imports. An Indian steel or aluminium exporter who supplies verified product-level emissions data directly lowers the buyer’s cost compared to default values. Suppliers who cannot produce that data become more expensive to source from, without changing their price by a single rupee. Right now, in the first year of the regime, is when EU buyers are locking in which suppliers can deliver this data and which cannot.

Supply chain due diligence laws. Germany’s supply chain due diligence law and the EU’s Corporate Sustainability Due Diligence Directive require large companies to identify and address environmental and human rights risks among their suppliers. A supplier who can evidence responsible waste handling, legal compliance, and worker safety shortens the buyer’s due diligence work. A supplier who cannot becomes a risk line item.

Deforestation-free sourcing rules. The EU Deforestation Regulation applies from 30 December 2026 for large and medium operators, with small enterprises following from June 2027. It covers cattle, cocoa, coffee, palm oil, soya, rubber, and wood, along with derived products such as leather, furniture, tyres, and chocolate. EU buyers of these commodities must file due diligence statements backed by geolocation data proving the goods came from deforestation-free land. For Indian exporters of coffee, rubber products, leather goods, and wooden furniture, the request for plot-level traceability data is arriving now, because buyers need their supply chains mapped before the deadline, not on it. Five months is not long to geolocate a supply chain.

Voluntary buyer commitments. Thousands of multinationals have set science-based emissions targets, and most corporate emissions sit in Scope 3, which is the supply chain. A buyer chasing a Scope 3 target needs supplier data to show progress. That need turns into EcoVadis assessments, CDP supply chain requests, and custom questionnaires with a submission deadline.

None of these forces asks whether your company is large enough to be regulated directly. They ask whether your customer is. That is why a 200-crore exporter with no direct disclosure obligation anywhere still ends up doing sustainability reporting.

The Domestic Version of the Same Pressure

Indian suppliers selling to large listed Indian companies face a parallel demand. SEBI’s BRSR framework requires the top listed companies to report ESG disclosures, and the BRSR Core framework extends selected indicators into the value chain. SEBI’s circular of March 2025 set a phased timeline for these value chain disclosures, beginning on a voluntary basis from FY 2025-26. That first voluntary cycle has now closed, and the large listed buyers who used it to build their supplier data pipelines are not going to dismantle them. If your customer is a top-250 listed company, the data request is a question of when, not whether. Our BRSR guide covers that framework in depth, so this article stays focused on the global buyer side.

The Sustainability Reporting Standards Buyers Actually Reference

There is no single global rulebook. There is a short list of global sustainability standards that keep appearing in buyer requirements, and knowing which one your customer follows tells you what data to prepare.

-GRI Standards. The most widely used sustainability reporting framework worldwide, focused on a company’s impacts on the environment and society. Many multinational buyers structure their own reports on GRI, so their supplier questions mirror GRI topic areas: emissions, energy, water, waste, labour practices.

-IFRS S1 and S2 (ISSB). Investor-focused sustainability reporting standards covering sustainability and climate disclosures. Dozens of jurisdictions, from the UK to Japan to Australia, are adopting or aligning with ISSB standards, which means climate data requests now come from buyers well beyond Europe. Suppliers who think of this as an EU issue are reading the map two years out of date.

-ESRS and the VSME standard. The European standards under CSRD, plus the voluntary SME standard the EU published for smaller companies. VSME matters most for Indian suppliers because EU buyers are using it to cap what they can reasonably ask of supply chain partners. Preparing data along VSME lines is currently the most efficient way to be ready for European customers.

-CDP and EcoVadis. Not regulations but scoring platforms. Many procurement teams simply require a CDP response or a minimum EcoVadis medal before onboarding a supplier. These assessments feed directly into vendor decisions.

-BRSR. India’s own corporate sustainability reporting format, relevant when your customer is listed in India.

The practical insight from our client work: these frameworks overlap heavily at the data layer. Energy consumed, emissions calculated, waste generated and recycled, water used, safety incidents, and legal compliance status cover most of what any framework asks. Build the data foundation once, and every questionnaire becomes a formatting exercise.

What a Buyer Questionnaire Actually Asks

Frameworks feel abstract until the questionnaire lands. Having answered hundreds of these on behalf of clients, we can tell you the content is remarkably consistent. A typical global buyer assessment covers five clusters.

-Energy and emissions. Annual electricity and fuel consumption, share of renewable energy, and Scope 1 and Scope 2 greenhouse gas emissions. Advanced buyers ask for emissions intensity per unit of product, and CBAM-exposed buyers ask for embedded emissions at product level.

-Waste and materials. Total waste generated by type, percentage recycled versus landfilled, hazardous waste handling, plastic packaging quantities, and proof of compliance with EPR waste rules. Your CPCB filings are the evidence base here, and buyers increasingly know enough to ask for them by name.

-Water and effluents. Water withdrawal, treatment and discharge arrangements, and consent compliance. Textile, leather, chemical, and food suppliers get the deepest questions in this cluster.

-Legal and ESG compliance status. Valid consents to operate, environmental authorisations, EPR registrations, any enforcement actions or penalties in the last three years, and certifications such as ISO 14001 or ISO 45001. A single lapsed authorisation here can freeze an otherwise strong assessment.

-Social and governance basics. Worker safety statistics, minimum age and wage compliance, grievance mechanisms, and anti-bribery policies. Due diligence laws make these questions mandatory for the buyer, so they are mandatory for you.

Two features of these questionnaires matter more than their content. They ask for evidence, not assertions, so every yes needs a document behind it. And they are scored, so a blank answer costs points even when the honest answer is “not yet measured.” The suppliers who perform best maintain a standing evidence file mapped to these five clusters and update it quarterly, which turns every new questionnaire from a fire drill into an afternoon’s work.

How Reporting Converts In CDP and EcoVadis to Won Business

Sustainability reporting wins customers through four specific mechanisms, and it helps to name them because each one is measurable.

You pass vendor onboarding instead of stalling in it. Large buyers run supplier ESG screening before a contract is signed. When the questionnaire arrives, the supplier who returns complete, evidenced answers in days keeps the deal moving. We have watched deals die not because a supplier’s practices were bad but because they could not document them before the buyer’s procurement window closed.

You score higher in RFQs where sustainability is weighted. Many multinational tenders now assign 10 to 30 percent of evaluation weight to sustainability criteria. At equal price and quality, the supplier with an EcoVadis score, a greenhouse gas inventory, and clean ESG compliance records wins the weighted comparison. Sustainability performance has become a tiebreaker in exactly the markets where price competition is fiercest.

You lower the buyer’s own compliance cost. This is the CBAM mechanism described above, and it generalises. Every verified data point you hand your customer is work their compliance team does not have to do and risk their auditors do not flag. Buyers consolidate volume with suppliers who make their reporting easier. Procurement teams call this supplier rationalisation, and reporting-capable suppliers end up on the right side of it.

You stay in the relationship as requirements tighten. Requirements ratchet. A buyer who asks for total emissions this year asks for product-level emissions in two years. The EUDR deadline in December will convert traceability from a nice-to-have into a market access condition for entire commodity groups. Suppliers who invested early climb the ladder in step. Suppliers who deferred face a cliff, because building a sustainability reporting system under a 60-day ultimatum from your largest customer is the most expensive way to build one.

Let’s Look at a Few Examples

These are based on real compliance situations we’ve worked through. Details have been modified to maintain confidentiality.

The textile exporter and the 40 percent customer. A Gujarat-based textile exporter earning 40 percent of revenue from one European retail group received an ESG assessment with a submission deadline. Their sustainability data existed only as scattered records: electricity bills, water bills, a waste vendor’s receipts. We rebuilt it into a structured inventory: energy consumption by source, plastic packaging quantities reconciled with their EPR filings, wastewater treatment records, and worker safety documentation. They passed the assessment, and their compliance data from EPR compliance filings provided a third of the environmental answers because that data had already been verified for the CPCB. The retained contract was worth more than a decade of reporting costs.

The metal components maker who priced below competitors without cutting price. An engineering goods manufacturer exporting aluminium components to Europe faced CBAM data requests from two importing customers once the definitive regime took effect. Rather than letting buyers fall back on default emissions values, we helped them calculate embedded emissions from their actual energy mix, which included a solar power purchase agreement that defaults would ignore. Their real numbers came in materially below defaults. One buyer responded by shifting volume to them from a supplier who had ignored the request. The emissions calculation cost them a fraction of what a price cut delivering the same competitive effect would have cost.

The supplier who prepared before being asked. A packaging producer supplying two top-100 listed Indian companies engaged us after reading about BRSR value chain disclosures, before either customer had asked for anything. We set up their environmental reporting baseline: a greenhouse gas inventory aligned with our note on emission targets, waste and recycling data flowing from their EPR records, and energy tracking. Eight months later the first customer questionnaire arrived. They answered in six days. Their competitor, by their own account, requested two extensions. Preparation is invisible right up until the moment it is the entire difference.

Building Reporting Capability Without Drowning In It

The mistake we see most often is starting with a framework document and trying to answer all of it. Start with data you already generate and expand outward.

-Begin with compliance data you already file. EPR returns quantify your plastic, e-waste, battery, tyre, or used oil obligations with regulator-verified numbers, tied to your annual recycling targets. Pollution consent conditions document your emissions and effluent parameters. This is environmental reporting you have already paid for. Use it.

-Add energy and emissions. Electricity bills and fuel purchase records are enough to build a Scope 1 and Scope 2 greenhouse gas inventory. This single dataset answers the most common question in every buyer questionnaire.

-Make the data continuous instead of annual. Buyers increasingly ask for evidence, not just totals. Systems that track material movement help here. Our Waste Tracker platform, for example, records waste from pickup through recycling, which turns a questionnaire answer into a documented chain.

-Map buyer requirements before choosing formats. Ask your top five customers which framework or platform they use. Prepare to that, in priority order of revenue. A sustainability strategy built around what your actual customers require beats one built around what a conference speaker recommended. If any of your products touch EUDR commodities, start the traceability mapping now, because plot-level geolocation data cannot be reconstructed retroactively in December.

-Only then formalise. A full report aligned to a recognised sustainability reporting framework makes sense once the data foundation is stable. Doing it in reverse produces a handsome document with numbers nobody can defend.

One warning that belongs in every version of this advice. Never submit estimates dressed as measurements. Buyers verify, CBAM data faces formal verification requirements, and a supplier caught inflating green claims loses more than the contract. Overstated sustainability claims now carry regulatory risk in the EU and reputational risk everywhere. Report what you can evidence, state what you cannot yet measure, and show a timeline for closing the gap. Buyers respond better to honest partial data than to perfect-looking numbers that collapse under one audit question.

Reporting Is the Output. Strategy Is the Asset.

A caution from practice. Companies that treat sustainability reporting as a document to produce each year get limited commercial value from it. The suppliers who win business treat reporting as the visible output of a working sustainability strategy, and buyers can tell the difference within one meeting.

The difference shows up in three places. First, in whether the numbers move. A buyer comparing two suppliers with similar disclosures will favour the one whose emissions intensity or recycling rate improves year on year, because a sustainable supply chain is built from suppliers who improve, not suppliers who merely measure. Second, in whether ESG compliance is current. A strong report sitting next to an expired consent or a missed EPR return tells the buyer the report is marketing. Regulators publish enforcement actions, and buyer due diligence teams check them. Third, in whether anyone in the company owns the subject. When a buyer’s sustainability team asks a follow-up question and the supplier’s answer requires three weeks and four departments, the relationship stalls.

So sequence the work honestly. Fix ESG compliance gaps first, because no report survives a compliance failure. Build the data systems second. Set an improvement roadmap third, even a modest one. Then report. A supplier following that order presents a sustainability strategy with evidence behind it, which is the only version global customers reward with contracts.

Where Nirmal Vasundhara Fits

We work with Producers, Importers, and Brand Owners on the full chain from waste compliance to disclosure. Our ESG reporting solutions build on the compliance data our clients already generate: EPR registration and returns across five waste categories, greenhouse gas inventories, BRSR preparation, and the supplier-side responses that global customer questionnaires demand. Because we handle the underlying EPR audit and filing work, the numbers in the sustainability report match the numbers filed with regulators, which is exactly what a buyer’s verification team checks first.

If your customers have started asking questions your current records cannot answer, that gap is closeable, and it is worth closing before the next questionnaire rather than after it.

Frequently Asked Questions

Q1 – What is sustainability reporting?

A – Sustainability reporting is the structured disclosure of a company’s environmental, social, and governance performance, covering areas like emissions, energy, waste, water, and labour practices. Companies report under frameworks such as GRI, ISSB standards, ESRS, or India’s BRSR format.

Q2 – Why do international buyers ask suppliers for sustainability data?

A – Buyers carry their own obligations under rules like CSRD, CBAM, EUDR, and supply chain due diligence laws, plus voluntary emissions targets. Those obligations cover their value chains, so buyers collect supplier data to complete their own reporting and reduce compliance risk.

Q3 – Which sustainability reporting framework should an Indian exporter follow?

A – Follow your customers. Ask your largest buyers which standard or platform they use, whether GRI, VSME, CDP, or EcoVadis, and prepare data to that. The underlying data overlaps heavily across frameworks, so one strong foundation serves multiple formats.

Q4 – Does CBAM apply to Indian companies directly?

A – No. CBAM obligations fall on EU importers of covered goods like steel, aluminium, and cement. But importers need embedded emissions data from their suppliers, so Indian exporters who provide verified emissions figures become cheaper and safer for EU buyers to source from.

Q5 – What is the EU Deforestation Regulation deadline for suppliers?

A – EUDR applies to large and medium EU operators from 30 December 2026, and small enterprises from June 2027. Indian exporters of coffee, rubber, leather, wood, and derived products should expect buyer requests for plot-level geolocation and traceability data before that date.

Q6 – Is sustainability reporting mandatory for small Indian suppliers?

A – Usually not by regulation. Small suppliers face the requirement contractually, through customer questionnaires, vendor onboarding, and tender criteria. The obligation arrives through the purchase order rather than through a government notification, which makes it commercially binding either way.

Q7 – How does ESG reporting improve supply chain relationships?

A – Verified supplier data cuts the buyer’s compliance workload, supports their sustainable supply chain commitments, and reduces their audit risk. Buyers consolidate orders with suppliers who make reporting easy, so ESG reporting capability directly supports retention and volume growth.