ESG for Chartered Accountants: The New Opportunity in Sustainability Assurance

Something important has shifted in Indian boardrooms over the last three years, and most Chartered Accountants haven’t yet fully realised the opportunity it represents. Companies are no longer just expected to file returns and report profits. They are now required by law to prove that their environmental and social conduct is credible, measurable, and independently verified. That verification needs someone with precisely the skills a qualified CA already possesses. This is why an ESG audit chartered accountant is fast becoming the most searched career pivot of the decade in India’s finance community.

What Is ESG Assurance - and Why Should CAs Care?

ESG stands for Environmental, Social, and Governance. At its core, it is a structured framework through which companies disclose how responsibly they operate - from carbon emissions and water usage to employee welfare and board ethics. The demand for sustainability assurance services has exploded because stakeholders, investors, regulators, lenders, and customers no longer take these disclosures at face value. They want independent professionals to verify them.

The Securities and Exchange Board of India (SEBI) mandated the Business Responsibility and Sustainability Report (BRSR) for the top 1,000 listed companies from FY 2022-23. BRSR Core assurance became compulsory for the top 150 companies from FY 2023-24, extended to the top 500 by FY 2024–25, and will cover all top 1,000 companies by FY 2026-27. That is a guaranteed, regulation-driven wave of demand - and every company in that bracket needs a qualified ESG audit chartered accountant to sign off on their disclosures.

KEY MARKET STATISTICS

Listed companies requiring BRSR by FY 2026–27: 1,000+

Global ESG advisory market CAGR through 2032: 26.9%

Year-on-year rise in BRSR engagements (EY, 2025): 40%

India’s ESG fund AUM in 2025 (growing 40% annually): ₹12,000 Crore+

ICAI’s Role: Setting the Standard for Indian CAs

ICAI's establishment of the SRSB and issuance of SSAE 3000 demonstrate its leadership, making Indian CAs feel recognised and capable in sustainability assurance services.

For those pursuing BRSR reporting for companies, the assurance framework operates at two levels: limited and reasonable assurance. Reasonable assurance demands a positively worded opinion, deeper testing, and larger sampling - equivalent in rigour to a statutory audit. Limited assurance covers value chain disclosures. CAs trained under SSAE 3000 are already equipped to deliver both. This positions every qualified ESG audit chartered accountant as the natural first choice for Indian corporates navigating ESG reporting India compliance.

“Finance Minister Nirmala Sitharaman has explicitly urged Chartered Accountants to develop expertise in ESG, carbon accounting, and CSR auditing - signalling that this is not a trend, it is policy direction.”

The Practical Opportunity: What Services Can a CA Offer?

ESG audit chartered accountants can build practices across multiple service lines. First, BRSR assurance engagements for listed companies, which are mandatory and deadline-driven under SEBI’s BRSR framework, meaning retainer relationships are natural. Second, carbon accounting for businesses: companies need help measuring Scope 1, Scope 2, and Scope 3 emissions under the GHG Protocol. India has committed to net-zero by 2070, with a 45% cut in emissions intensity by 2030, creating sustained demand for carbon accounting across industries.

Third, supply chain ESG advisory: under the BRSR Core, BRSR reporting for companies must extend to value chain partners that account for 75% of purchases and sales by value. Large companies are pushing ESG data requirements upstream to their suppliers, including MSMEs. A small auto component supplier in Pune that is not directly covered by BRSR may still be asked by its listed client to furnish ESG data, thereby creating indirect demand for ESG consulting services in India. This is where smaller CA firms have a genuine edge - by building local, trusted advisory relationships that larger consulting firms find uneconomical, they can differentiate themselves and capture niche market share.

Sustainability assurance services also extend into banking and green finance. The Reserve Bank of India has issued guidelines requiring banks to assess climate-related financial risks in their lending portfolios. In June 2025, SEBI established standards for ESG debt securities, covering green bonds, social bonds, and sustainability-linked instruments. CAs who master ESG reporting in India disclosures and can bridge them with financial assurance become invaluable to both issuers and lenders. The role of the ESG consultant in India has never been more commercially grounded.

Skills a CA Needs to Break Into ESG Assurance

The transition from financial audit to ESG audit for chartered accountants is less daunting than it sounds. The fundamentals: independence, materiality assessment, evidence gathering, and professional scepticism - remain identical. What changes is the framework. Instead of IndAS, practitioners now work with the GHG Protocol for business carbon accounting, the GRI Standards, and SEBI’s BRSR format. To succeed, CAs should pursue certifications like the ICAI's Certificate Course on Sustainability and BRSR, which provide practical skills and credibility. A detailed roadmap is available via TaxGuru’s ESG CA guide for those looking to plan their transition step by step.

According to a global study by IFAC, AICPA, and CIMA, 70% of companies that obtained sustainability assurance services engaged their statutory auditor or a professional accountant to review their ESG disclosures as well. This means the existing statutory audit relationship is a built-in opportunity for companies to report under BRSR and for assurance cross-selling. The ESG reporting India landscape rewards CAs who are already inside these companies - they simply need to expand their scope of engagement.

The Time to Act Is Now - Not Later

The regulatory clock is ticking, and it does not pause for preparation. Every year, more companies are pulled into SEBI’s BRSR assurance mandate. Every year, the scope of BRSR reporting for companies widens further into supply chains, dragging thousands of MSMEs and unlisted entities into the ESG disclosure orbit. For an ESG audit chartered accountant, this is not a future opportunity - it is a present one, already unfolding in every listed company’s annual report cycle right now.

India’s ESG advisory market is growing at 8.2% CAGR through 2033. Globally, sustainability assurance services are projected to reach USD 114 billion by 2032. Asia, with India at its centre, is expected to register the fastest regional growth at 20% CAGR. The companies filling those mandates will not wait for their accountants to catch up. The CAs who move now - who invest in learning the frameworks, building the methodology, and positioning themselves as credible ESG consultant India professionals - are the ones who will own this space.

ESG Saathi is being built with exactly this community in mind: Chartered Accountants and finance professionals who recognise that ESG reporting in India is not a niche trend but the next structural shift in how Indian businesses are held accountable. We are a platform designed to bridge the gap between technical ESG frameworks and the practical reality of CA practice in India - from understanding SSAE 3000 to structuring your first carbon accounting for business engagement. Whether you are a seasoned ESG consultant in India or just beginning to explore sustainability assurance services, stay connected with us as we build the tools, resources, and community that the next generation of Indian ESG assurance professionals will rely on.