ICAI Sets New Assurance Standards for ESG Reporting Across India Inc

The Institute of Chartered Accountants of India (ICAI) has finally put a formal stamp on sustainability assurance in the country. After months of consultations with regulators, the body released the Standard on Sustainability Assurance – SSA 5000 – which aims to bring a uniform, rigorous check‑point to environmental, social and governance (ESG) disclosures.

From April 1, 2027, auditors and assurance professionals will have to follow SSA 5000 when they verify the sustainability reports filed by the top‑most 1,000 listed companies – the very firms that SEBI now obliges to publish data under the Business Responsibility and Sustainability Reporting (BRSR) framework. In other words, the rulebook is catching up with the mandate.

“This is a significant step in sustainability assurance and a principle‑based framework,” said Prasanna Kumar D, President of ICAI. He noted that until now there was no standardized format, even though the reporting requirement is mandatory for those large caps.

What makes SSA 5000 stand out is its flexibility. While it leans on international best practices, it also accommodates the diversity of reporting frameworks that Indian companies use today. The goal, according to an ICAI statement, is to “inspire enduring confidence among investors and stakeholders alike” by ensuring that ESG information is not just a box‑ticking exercise.

The new standard was drafted after a series of dialogues with the Securities and Exchange Board of India (SEBI) and received the green light from the ICAI Central Council just weeks ago. It dovetails with SEBI’s own push for greater transparency – the regulator already mandates BRSR disclosures for the 1,000 biggest listed firms based on market capitalisation.

Beyond the mandatory crowd, the framework also opens doors for companies that voluntarily adopt BRSR. They, too, can benefit from a clear assurance pathway, which many investors now view as a litmus test for credibility and risk management.

ICAI isn’t stopping at the assurance standard. Earlier this year it rolled out a draft exposure note on SSA 5000, and it is also working on a guidance note to help firms prepare their BRSR reports. In parallel, the body has launched certificate courses for its members, ensuring that a pool of qualified sustainability assurance professionals will be ready when the clock starts ticking.

In practice, the standard will tighten the rigour of ESG disclosures, reduce green‑washing, and give investors a more reliable lens through which to assess corporate sustainability performance. For companies, that could translate into better access to capital, as more funds tie their allocations to credible ESG metrics.

All eyes will now be on the market to see how quickly auditors adopt the new guidelines and how firms adjust their reporting processes. One thing is clear: the era of informal, ad‑hoc sustainability assurance in India is drawing to a close.