IFRS S1 for Insurance in Mexico: 2026 Guide
IFRS S1 establishes general requirements for BMV and BIVA-listed issuers to disclose material information about sustainability-related risks and opportunities in their annual reports. CNBV made it mandatory starting January 2025, with the first report covering FY2025 data due in 2026. IFRS S1 acts as the umbrella standard that complements IFRS S2 on climate-specific matters.
The insurance sector faces the highest direct physical risk of all financial sectors in Mexico. Hurricane Otis (October 2023, Guerrero) demonstrated that historical catastrophe models underestimate losses under climate intensification. IFRS S1 requires insurers to disclose how their actuarial models incorporate climate change — a disclosure that CNSF and CNBV will coordinate for 2026 reports.
Why IFRS S1 Applies Differently in Insurance
Risk Director and Sustainability Director of listed insurers or those with public debt required to report IFRS S1/S2 and disclose their climate risk exposure in technical reserves
Physical risk in technical reserves: extreme climate events (Otis in Guerrero 2023: insured losses >USD 16B) are the biggest risk for insurers — IFRS S1 requires modeling how claim frequencies and severities change under RCP 4.5 and 8.5 by 2040
Scope 3 category 15: investment portfolio (fixed income, equity) of technical reserves generates financed emissions that the insurer must calculate under PCAF — data that no Mexican insurer has calculated
Damage insurance pricing in areas of growing climate risk: IFRS S1 requires disclosing whether premiums reflect updated climate risk — CNSF (National Insurance and Bonding Commission) may require alignment
AXA and Mapfre: European parent companies under CSRD require ESRS E1 data from Mexican subsidiary with investment portfolio granularity — information subsidiaries do not collect to report to parent
Critical IFRS S1 KPIs for Insurance
| Required KPI | Data Source | Difficulty |
|---|---|---|
| Climate risk-adjusted expected loss (EAL): change in expected annual loss from property portfolio under RCP 4.5 vs. historical baseline | Value chain (Scope 3) | High 🔴 |
| Investment portfolio financed emissions: tCO₂e attributable per MXN invested (calculated under PCAF) | ERP / operating systems | High 🔴 |
| Percentage of investment portfolio in high transition risk assets (fossil fuels, automotive) vs. low-carbon assets | Cat 15 - Emisiones financiadas del portafolio de inversiones | High 🔴 |
| Climate-adjusted premium: percentage of property portfolio with premiums recalibrated with updated climate catastrophe models | HR / payroll system | Medium 🟡 |
| Insurer operational carbon intensity: tCO₂e per employee and per million pesos of written premium | ERP / accounting system | Medium 🟡 |
Hard-to-Collect Data in Insurance
Financed emissions from technical reserves investment portfolio: requires crossing fixed income/equity holdings with issuer emission data — a PCAF analysis no Mexican insurer has automated
Expected losses from extreme climate events at 2030/2050 under RCP scenarios: requires catastrophe actuarial models recalibrated with climate projections (RMS, AIR Worldwide with CMIP6 data)
Historical claims attributable to climate vs. non-climate events: claim cause classification in insurer legacy systems rarely includes the climate driver
That is why manual Excel-based processes will not pass the 2027 assurance. Without automated traceability, an external auditor cannot verify the completeness or accuracy of emissions data.
Checklist: 8 Steps to Comply with IFRS S1 in Insurance
- 1
Identification and disclosure of all sustainability-related risks and opportunities material to the enterprise
- 2
Description of board and management oversight of sustainability risks
- 3
Scenario analysis to assess strategy resilience under different sustainability futures
- 4
Description of processes for identifying, assessing, and managing sustainability risks integrated into corporate governance
- 5
Disclosure of metrics and targets used to manage and monitor material risks and opportunities
- 6
Connect data sources (ERP, meters, suppliers) to a centralized platform
- 7
Review with internal audit team and adjust consolidation perimeter
- 8
Generate report in CNBV/CINIF format ready for external assurance
How Climatta Automates IFRS S1 for Insurance
Automated Collection
Eliminate spreadsheets in Insurance. Climatta connects your systems and automatically collects Climate risk-adjusted expected loss and other critical KPIs.
Auditor-Grade Traceability
Every data point has source, date, and owner documented. The 2027 assurance auditor can trace every figure to its origin in your systems.
IFRS S1 Report Ready
Generates the report in the exact CNBV format — tables, metrics, and narrative. No last-minute manual reformatting.
Onboarding in 4 Weeks
Climatta connects to Insurance systems in 4 weeks. No months-long IT project or external implementation consultant.
FAQ: IFRS S1 in Insurance
Ready to comply with IFRS S1 in Insurance?
Climatta centralizes all data collection, generates the report in regulatory format, and leaves it ready for 2027 external assurance. No spreadsheets.