IFRS S2 + NIS B-1 for Automotive in Mexico: 2026 Guide
BMV and BIVA issuers face the unique challenge of simultaneously complying with IFRS S2 (CNBV) and NIS B-1 (CINIF) for the same fiscal year, implying two regulatory frameworks, two regulators, and potentially two external assurance processes. Without a centralized platform, companies end up with sustainability and finance teams operating in silos, collecting redundant data in non-auditable spreadsheets. The overlap between IBSO indicators and IFRS S2 metrics is significant but not total, requiring precise mapping.
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 S2 + NIS B-1 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 S2 + NIS B-1 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 S2 + NIS B-1 in Automotive
- 1
Mapping and reconciliation of all 30 IBSO indicators with IFRS S2 metrics requirements to avoid duplication of effort
- 2
Unified GHG emissions data collection for Scope 1, 2, and 3 serving both frameworks simultaneously without double measurement
- 3
Management of two distinct assurance processes: CNBV's limited assurance under IFRS S2 and CINIF's review under NIS B-1, ideally with the same auditor
- 4
Alignment of reporting calendars — the integrated sustainability report must meet both deadlines from a single data collection cycle
- 5
Implementation of robust internal controls over sustainability information capable of supporting third-party assurance under both frameworks from 2027
- 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 S2 + NIS B-1 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 S2 + NIS B-1 Report Ready
Generates the report in the exact CNBV + CINIF 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 S2 + NIS B-1 in Automotive
Ready to comply with IFRS S2 + NIS B-1 in Automotive?
Climatta centralizes all data collection, generates the report in regulatory format, and leaves it ready for 2027 external assurance. No spreadsheets.