BRSR Core vs IFRS S2 — Indian Mandate vs ISSB Global Climate Baseline

Who this page is for

Three audiences:

1. Indian listed entities in BRSR Core scope evaluating whether to additionally adopt IFRS S2 voluntarily — typically driven by an international parent, major investor, or cross-border listing aspiration.
2. CA firms and ESG consultants advising Indian groups on disclosure architecture across BRSR Core (mandatory) and IFRS S2 (voluntary in India).
3. International readers trying to understand why an Indian listed entity reports under BRSR Core instead of (or alongside) IFRS S2.

The short version: BRSR Core is mandatory in India; IFRS S2 is not. India has not adopted IFRS S2 as of May 2026, though ICAI’s SRSB is actively engaged with the ISSB. The two standards have substantial GHG-inventory overlap but differ in scope (BRSR Core is ESG-wide; IFRS S2 is climate-only), depth (IFRS S2 is deeper on climate including Scope 3 + transition plan), and assurance (BRSR Core mandates reasonable assurance; IFRS S2 has no built-in assurance regime).

The side-by-side

Dimension	BRSR Core (SEBI, India)	IFRS S2 (ISSB, global)
Issued by	Securities and Exchange Board of India (SEBI)	International Sustainability Standards Board (ISSB), IFRS Foundation
Issued	12 July 2023 (Circular)	June 2023 (alongside IFRS S1)
Effective	FY 2023-24 onwards, phased: Top 150 (FY24), Top 250 (FY25), Top 500 (FY26), Top 1,000 (FY27)	Periods beginning on or after 1 January 2024 (where adopted)
Scope	ESG-wide — 9 attributes spanning environment, social, governance	Climate-only — governance, strategy, risk management, metrics-and-targets
Subject matter	KPI-based, 9 specific quantitative + qualitative attributes	Principles-based, full climate disclosure architecture
Status in India	Mandatory for listed entities in the phased glide path	Not adopted; voluntary if entity elects
Status globally	India-only	Adopted (mandatory or voluntary) by 20+ jurisdictions as of Jan 2026; 36 in pipeline as of June 2025
Scope 1	Required (via GHG Intensity per Revenue attribute)	Required
Scope 2	Required (location-based; market-based optional)	Required (both location + market-based where applicable)
Scope 3	Not required under BRSR Core (separate BRSR Value Chain Verification covers limited supplier scope)	Required; one-year transitional relief in first year of application
Transition plan	Disclosed in BRSR Section C Principle 6 narrative; not a stand-alone requirement	Required disclosure if entity has a transition plan; ISSB Dec 2025 amendments support disclosure architecture
Assurance	Reasonable assurance mandated by SEBI; signed by ICAI-empanelled partner CA firm under SAE 3000 (Revised) + SAE 3410	No built-in assurance requirement; jurisdiction-specific
Materiality	Prescriptive — SEBI defines the 9 attributes	Financial materiality — what is material to a primary user’s investment decision
Filing location	Alongside Annual Report; filed with stock exchanges	Reporting period filings per jurisdiction’s adoption

The fundamental difference in approach

BRSR Core is prescriptive. SEBI defined nine specific attributes that every in-scope listed entity must disclose with reasonable assurance. Every entity reports the same 9 things in the same structure. The reader can compare across entities directly.

IFRS S2 is principles-based. The standard sets architectural requirements (governance + strategy + risk management + metrics-and-targets pillars, drawn from the TCFD framework) and requires the entity to disclose material climate-related information following those principles. Different entities will produce different disclosures, all compliant. The reader needs to read each entity’s full disclosure rather than compare line-by-line.

This is a deliberate philosophical difference. SEBI’s intent is to make assurance feasible at scale across 1,000 Indian listed entities — prescribed attributes are easier to assure than principles-based narratives. The ISSB’s intent is to drive investor-decision-useful information that entities can adapt to their own materiality — at the cost of comparability.

Where the overlap is operationally

For an Indian listed entity that elects to disclose under both regimes voluntarily, the operational overlap is substantial:

• GHG inventory — Scope 1 + Scope 2 calculation, source data, methodology — is shared across both filings.
• Climate governance disclosure — board oversight, management responsibility, escalation pathways — substantially shared.
• Climate-related risks and opportunities — identified through a single materiality / double-materiality exercise — feeds both BRSR Section C Principle 6 narrative and IFRS S2 strategy disclosures.
• Targets and metrics — net-zero commitments, intensity reduction trajectories, SBTi validations if any — disclosed in both regimes.

Where the regimes diverge:

• Scope 3. IFRS S2 requires it (with one-year transitional relief in year 1); BRSR Core does not. An entity electing to disclose under both regimes needs Scope 3 inventory work that BRSR Core alone does not require.
• Transition plan. IFRS S2 has a dedicated transition plan disclosure architecture (with ISSB Dec 2025 amendments). BRSR Core does not. Entities electing to disclose under both regimes typically use the integrated architecture in the Climate Transition Plan methodology page.
• Assurance. BRSR Core mandates reasonable assurance — heavier evidence requirement. IFRS S2 has no built-in assurance requirement; jurisdictions adopting IFRS S2 set their own assurance regime separately.

Why some Indian listed entities are doing IFRS S2 voluntarily

Four common drivers seen in BatchWise’s market observation work (not endorsements of any specific entity’s approach):

1. US-listed parent or large international investor. A US-listed parent group’s annual sustainability report increasingly draws on IFRS S2 architecture; the Indian subsidiary’s consolidated input is more useful to the parent if it follows the same disclosure structure.
2. International debt covenants. Some sustainability-linked loans or green bonds have covenants tied to TCFD-aligned disclosure. Since TCFD was retired into IFRS S2 in 2024, the cleanest pathway is IFRS S2 alignment.
3. Cross-border listing aspirations. Indian listed entities exploring secondary listings (LSE, Singapore, NYSE) face IFRS S2 as either a mandatory requirement (Hong Kong from 1 Aug 2025; UK proposed adoption) or a strong investor expectation.
4. Existing TCFD work re-anchored. Indian entities that did TCFD-aligned reporting voluntarily in 2022-2024 found that work re-anchored to IFRS S2 by their sustainability consultants in 2025; continuing on the IFRS pathway voluntarily preserves the disclosure work.

What BatchWise does

BatchWise is a coordination platform routing engagements to ICAI-empanelled partner CA firms (we do not sign assurance reports). For BRSR Core, the partner CA firm performs reasonable assurance under SAE 3000 (Revised) + SAE 3410 — fixed-price ₹75,000 engagement with 72-hour SLA. See the BRSR Core Assurance service page.

For voluntary IFRS S2-aligned reporting work — GHG inventory expansion to Scope 3, transition plan documentation, climate-related risk and opportunity analysis under the IFRS S2 architecture — the engagement is scoped separately during consult intake. For Indian exporters with international assurance recognition needs, the ISAE 3410 GHG verification service covers the GHG component; the broader IFRS S2 reporting work is typically anchored by the same partner CA firm to maintain inventory consistency.

Common confusions

“If I do BRSR Core, am I also IFRS S2 compliant?” No. BRSR Core covers Scope 1 + Scope 2 + intensity but not the full IFRS S2 governance + strategy + Scope 3 + transition plan architecture. The data overlap is real (GHG inventory is shared); the disclosure compliance is not.

“If I do IFRS S2, can I skip BRSR Core?” No. BRSR Core is a SEBI mandate for in-scope Indian listed entities. IFRS S2 has no Indian regulatory standing as of May 2026. You file BRSR Core mandatorily; IFRS S2 is additional voluntary work.

“Will ICAI adopt IFRS S2 soon?” Unclear timeline. ICAI’s SRSB is engaged with the ISSB and held public webinars comparing BRSR with IFRS S1/S2 in May 2025. India is part of the ISSB Emerging Economies Group. There is no notified MCA or SEBI adoption pathway as of May 2026.

“Do I need separate auditors for BRSR Core and IFRS S2?” No. The same ICAI-empanelled partner CA firm can perform both — BRSR Core under SAE 3000 (Revised) + SAE 3410 for the mandatory Indian filing, and IFRS S2-aligned work under whichever standard is operative (SAE 3000 (Revised) for Indian recognition, ISAE 3410 today / ISSA 5000 from 15 Dec 2026 for international recognition).