IFRS S2 Physical vs Transition Risks: What Mexican Companies Must Disclose in 2026
Under IFRS S2, Mexican companies listed on the BMV and BIVA must disclose two distinct categories of climate-related risk: physical risks — direct impacts from climate events on assets, operations, and supply chains — and transition risks — financial consequences of the shift to a low-carbon economy, including policy changes, new technologies, and shifting market demand. The CNBV requires the first IFRS S2 disclosure for fiscal year 2025 data, with the report due in 2026. Understanding both risk categories and mapping them to your specific sector is the critical first step in compliance.
What IFRS S2 Requires: The Two-Risk Framework
IFRS S2 — the climate-related disclosures standard issued by the International Sustainability Standards Board (ISSB) — builds directly on the Task Force on Climate-related Financial Disclosures (TCFD) framework. It organizes climate risk into two main buckets, both of which can create material financial impacts and therefore require disclosure.
For Mexican issuers, the CNBV mandated IFRS S2 through a modification to the Circular Única de Emisoras, effective January 29, 2025. The first reporting cycle covers FY2025 data, with external assurance (limited) required starting with FY2026 data. That assurance deadline — 2027 — is what makes getting both risk categories right in 2026 so critical.
Physical Risks Under IFRS S2
Physical risks arise from climate and weather events that can damage or disrupt a company's physical assets, workforce, supply chain, or operating environment. IFRS S2 divides physical risks into two sub-types:
Acute Physical Risks
Acute risks are event-driven — they occur suddenly and can cause immediate financial damage. Examples relevant to Mexico include:
Hurricanes and tropical storms (Gulf of Mexico coast — Veracruz, Tamaulipas, Quintana Roo)
Floods and flash flooding in urban industrial zones (ZMVM, Monterrey, Guadalajara)
Extreme heat events affecting outdoor workers and agricultural supply chains
Wildfires in forested and semi-arid regions (Jalisco, Chihuahua, Sonora)
Severe droughts disrupting water supply for industrial and agricultural operations
Chronic Physical Risks
Chronic risks are longer-term shifts in climate patterns that gradually erode business conditions. For Mexico, the most material chronic risks are:
Sustained water stress: Mexico ranks 24th globally for water risk (WRI Aqueduct). Over 50% of the country's territory faces medium-to-high water stress — directly affecting manufacturing, agribusiness, beverages, and mining.
Rising mean temperatures: Higher cooling and refrigeration energy costs; reduced worker productivity in heat-exposed industries (construction, agriculture, logistics).
Coastal erosion and sea-level rise: Tourism, real estate, and port infrastructure in Cancún, Los Cabos, and Veracruz face increasing asset devaluation risk.
Shifting precipitation patterns: Agricultural output volatility affecting food & beverage companies across the supply chain.
Transition Risks Under IFRS S2
Transition risks arise as societies and economies shift toward lower carbon emissions. For Mexican companies, four sub-categories of transition risk are most relevant:
1. Policy and Legal Risk
Mexico's energy and climate policy landscape is evolving. Key exposures include:
Carbon pricing mechanisms: Mexico has a voluntary carbon market and an emissions trading pilot. Companies with high Scope 1 emissions face potential cost increases as the system matures.
EU Carbon Border Adjustment Mechanism (CBAM): Mexican exporters to Europe in cement, steel, aluminum, fertilizers, and electricity face new carbon tariffs beginning 2026.
Greenwashing liability: CNBV and PROFECO are increasing scrutiny of unsubstantiated ESG claims, creating legal exposure for companies that cannot support their disclosures with auditable data.
T-MEC / USMCA provisions: Labor and environmental chapters may trigger trade restrictions for companies with poor sustainability performance.
2. Technology Risk
The shift to cleaner technologies creates both risk and opportunity. High-carbon assets may become stranded as renewable energy costs fall. Companies that delay capital reallocation risk holding underperforming infrastructure. For energy-intensive sectors in Mexico — cement, steel, petrochemicals — the technology transition timeline is a material financial risk under IFRS S2.
3. Market Risk
Changing customer and investor preferences are creating market risk across sectors:
Institutional investors (pension funds, ESG-screened ETFs) are divesting from high-emission companies, affecting access to capital and cost of debt.
Major multinationals operating in Mexico (Walmart, FEMSA supply chains, automotive OEMs) are imposing Scope 3 decarbonization requirements on Mexican suppliers.
Green bond and sustainability-linked loan markets require credible data — companies without it face higher financing costs.
4. Reputational Risk
Reputational risk from climate inaction is rising. MSCI, Sustainalytics, and ISS now factor climate management into ESG ratings that influence institutional investor decisions. A downgrade in ESG rating can reduce liquidity, increase cost of capital, and trigger analyst downgrades. For Mexican companies with significant foreign institutional ownership (common in the IPC), this is a direct financial exposure.
Physical vs Transition Risks: Side-by-Side Comparison
The following comparison helps clarify how each risk type manifests financially:
Physical risks → Asset impairment, increased insurance premiums, supply chain disruption, higher capex for resilience, operational downtime
Transition risks → Stranded assets, carbon costs, lost revenue from declining demand, higher compliance costs, limited access to capital markets
Both risk types → Can reduce enterprise value, affect credit ratings, and trigger material adjustments in financial statements
Key difference in horizon → Physical risks can materialize over decades (chronic) or immediately (acute); transition risks typically materialize over 5–15 years as policy and market conditions evolve
How IFRS S2 Requires You to Disclose These Risks
IFRS S2 requires disclosure across four pillars — Governance, Strategy, Risk Management, and Metrics & Targets. Both physical and transition risks must be addressed in each pillar. Here is what disclosure looks like in practice:
Governance (Pillar 1)
Disclose which board committee oversees climate risk (including physical and transition risks), how often they review it, and what management-level roles are accountable.
Strategy (Pillar 2)
Disclose which physical and transition risks you identified as material, their time horizons (short: <1yr, medium: 1–5yr, long: >5yr), how they affect your business model and financial position, and your resilience strategy. This is also where climate scenario analysis is applied — typically using a 1.5°C scenario and a 3–4°C scenario to stress-test your business.
Risk Management (Pillar 3)
Describe your process for identifying, assessing, prioritizing, and monitoring climate risks — and how this process integrates with your company's overall enterprise risk management (ERM) framework.
Metrics & Targets (Pillar 4)
Disclose Scope 1, 2, and 3 GHG emissions (with a transition relief for Scope 3 through end of 2026), climate-related financial metrics (percentage of assets exposed to physical risk, percentage of revenue at risk from transition risks), and any decarbonization targets you have set.
Mexico-Specific Risk Hotspots by Sector
Not all sectors face the same mix of physical and transition risks. Mexican companies should prioritize their materiality assessment based on sector exposure:
FIBRAs and Real Estate: High physical risk (coastal flooding, urban heat island) + transition risk (building efficiency standards, stranded assets)
Mining (Grupo México, Industrias Peñoles): High water stress (physical, chronic) + EU CBAM exposure (transition)
Food & Beverage (FEMSA, GRUMA, Bimbo): Agricultural supply chain drought risk (physical) + consumer preference shifts + water scarcity in operations
Cement and Construction (CEMEX): High transition risk from carbon pricing and CBAM + physical risks to operations in high-heat zones
Retail and Consumer (Liverpool, Coppel): Supply chain physical risk + reputational/market transition risk from ESG-conscious consumers
Banks and Financial Services (Banorte, BBVA México): Transition risk from loan book exposure to high-carbon industries; physical risk to collateral assets in exposed regions
The Data Challenge: Why Manual Processes Fail
Disclosing both physical and transition risks under IFRS S2 is not a narrative exercise — it requires quantitative data. According to CNBV guidance aligned with ISSB, companies must be able to support their disclosures with auditable data by 2027 (limited assurance). This means:
Physical risk quantification requires GIS-based asset mapping, climate hazard overlays, and modeled financial loss estimates — data that lives in operations, facilities, and supply chain systems
Transition risk quantification requires Scope 1, 2, and 3 emissions data, carbon price assumptions, and revenue exposure modeling — data spread across ERPs, subsidiaries, and suppliers
Only 50% of Mexican companies currently measure Scope 1 and 2; 75% do not measure Scope 3 — making transition risk disclosure a major data collection challenge
Companies relying on Excel and email to collect sustainability data from subsidiaries and suppliers will not be able to produce the volume and quality of data required for IFRS S2 assurance. A centralized, automated data collection platform is the infrastructure layer that makes both physical and transition risk disclosure viable at scale.
Frequently Asked Questions
Does IFRS S2 require disclosing both physical and transition risks?
Yes. IFRS S2 requires companies to identify and disclose all climate-related risks and opportunities that could reasonably be expected to affect cash flows, access to finance, or cost of capital. Both physical and transition risks must be assessed, and those deemed material must be disclosed across all four reporting pillars (Governance, Strategy, Risk Management, Metrics & Targets).
What is the difference between IFRS S2 physical risk and transition risk?
Physical risks come from climate events (floods, hurricanes, drought, heat) that can damage assets and disrupt operations. Transition risks come from the economy shifting to lower carbon — through new policies, changing technologies, market shifts, and reputational pressures. Both types can have material financial impacts and must be evaluated separately.
Which Mexican companies are required to disclose under IFRS S2?
Companies that are issuers (emisoras) listed on the BMV or BIVA are subject to CNBV's mandatory IFRS S2 disclosure requirement. This covers approximately 130+ listed companies. Private companies are not subject to IFRS S2 but may be subject to NIS B-1 under CINIF, which also includes climate-related environmental indicators.
When is the deadline for the first IFRS S2 climate risk disclosure in Mexico?
The first IFRS S2 report covers FY2025 data and must be filed in 2026. Limited assurance by an external auditor becomes mandatory starting with FY2026 data (filed in 2027). Reasonable assurance is expected from FY2027 data onward (filed in 2028).
Do I need to disclose transition risks if my company is not in a high-emission sector?
Yes, if they are material. IFRS S2 applies a materiality lens — you disclose risks that could affect your financial position or business model. Even service companies face transition risks through supply chain exposure, customer demand shifts, or access to ESG-screened capital. However, the depth of analysis required depends on the magnitude of the risk to your specific business.
How does Climatta help with physical and transition risk disclosure?
Climatta automates the collection of the underlying data required for both risk categories: GHG emissions data for transition risk quantification (Scope 1, 2, and 3 from ERPs, utilities, and suppliers), and operational data for physical risk exposure assessments. All data is centralized, version-controlled, and audit-ready — meeting the assurance requirements the CNBV will enforce starting in 2027.