IFRS S1 for Automotive 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.
Mexican automotive suppliers are the only BMV sector where Scope 3 Cat 11 (product use) is calculable with established methodology — ISO 14040/14044 LCA for automotive components — but requires vehicle useful life mileage data and destination market energy mix (USA, Europe, China) that Nemak must obtain from its OEM clients.
Why IFRS S1 Applies Differently in Automotive
CFO and Sustainability Director of BMV-listed Tier 1-2 automotive suppliers
Carbon footprint per part/component required by OEMs (GM, Ford, Stellantis) as a contract condition since 2025 — data that Nemak/Rassini must report before the official IFRS S2 deadline
Aluminum casting process (Scope 1 intensive): multiple furnaces per plant with differentiated consumption — SAP PM captures operating time but not direct gas consumption per heat
Scope 3 Cat 11 (use of parts in sold vehicles) — fraction of vehicle lifecycle emissions attributable to the manufactured component, methodology under ISSB discussion
Secondary aluminum alloys (post-consumer recycled) vs. primary aluminum — 95% difference in upstream Scope 3 Cat 1 that significantly affects the total
Critical IFRS S1 KPIs for Automotive
| Required KPI | Data Source | Difficulty |
|---|---|---|
| Energy intensity per tonne of cast aluminum (GJ/t) | Direct combustion (Scope 1) | High 🔴 |
| GHG per tonne of part produced (tCO2e/t) | Electricity bills (Scope 2) | High 🔴 |
| Percentage of recycled aluminum in charge mix (%) | Cat 1 - Aluminio primario y aleaciones compradas | High 🔴 |
| Foundry waste generation per tonne produced (kg/t) | HR / payroll system | Medium 🟡 |
| Water consumed in cooling per tonne produced (m³/t) | ERP / accounting system | Medium 🟡 |
Hard-to-Collect Data in Automotive
Natural gas consumption per foundry furnace disaggregated by shift/heat quality (SCADA systems exist but not connected to ERP)
Percentage of recycled aluminum per production batch with supplier traceability for Scope 3 Cat 1
PFC (perfluorocarbon) emissions in primary aluminum production at reduction plants (if applicable)
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 Automotive
- 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 Automotive
Automated Collection
Eliminate spreadsheets in Automotive. Climatta connects your systems and automatically collects Energy intensity per tonne of cast aluminum 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 Automotive systems in 4 weeks. No months-long IT project or external implementation consultant.
FAQ: IFRS S1 in Automotive
Ready to comply with IFRS S1 in Automotive?
Climatta centralizes all data collection, generates the report in regulatory format, and leaves it ready for 2027 external assurance. No spreadsheets.