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    IFRS S1 for FIBRAs (REITs) with Excel / Proceso Manual: Data Integration 2026

    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.

    Excel is the 'de facto ERP' for sustainability in most Mexican companies — even those with SAP or Oracle use Excel to compile ESG data across departments. The fundamental problem for 2027 assurance is that Excel has no chain of custody: any cell can be modified without a record, emission factor calculations are not auditable, and manual consolidation across plants and periods introduces systematic errors. Climatta resolves this with a structured upload process from validated Excel templates, automatically creating the audit trail the assurer needs: who captured each data point, when, from what source, and whether it was modified.

    Data Already in Your Excel / Proceso Manual

    Your Excel / Proceso Manual already has most of the data IFRS S1 requires. Climatta extracts it automatically without manual work.

    IFRS S1 RequirementExcel / Proceso Manual ModuleAvailable
    Identification and disclosure of all sustainability-related risks and opportunities material to the enterpriseHojas de cálculo Excel✅
    Description of board and management oversight of sustainability risksCorreo electrónico✅
    Scenario analysis to assess strategy resilience under different sustainability futuresFormatos PDF✅
    Description of processes for identifying, assessing, and managing sustainability risks integrated into corporate governanceReportes manuales⚠️
    Disclosure of metrics and targets used to manage and monitor material risks and opportunitiesGoogle Sheets⚠️

    Electricity and gas invoices in PDF — data available but scattered across emails and folders with no structure

    Fleet fuel records in ad-hoc formats by driver — fragmented, with no auditable chain of custody

    Waste reports from environmental vendors in paper or PDF — not integrated into the sustainability reporting process

    Payroll and HR in proprietary spreadsheets — social indicators calculable but with manual error risk and no version control

    Why Excel from Excel / Proceso Manual Will Not Pass the 2027 Assurance

    Integration complexity: Low

    No audit trail: the auditor cannot trace the data back to its source in Excel / Proceso Manual

    Formula error risk: one miscalculated cell invalidates the entire report

    No change history: impossible to demonstrate data integrity over time

    Excel / Proceso Manual → Excel → report = 3 manual transformations with no governance control

    How Climatta Connects with Excel / Proceso Manual

    Excel is the 'de facto ERP' for sustainability in most Mexican companies — even those with SAP or Oracle use Excel to compile ESG data across departments. The fundamental problem for 2027 assurance is that Excel has no chain of custody: any cell can be modified without a record, emission factor calculations are not auditable, and manual consolidation across plants and periods introduces systematic errors. Climatta resolves this with a structured upload process from validated Excel templates, automatically creating the audit trail the assurer needs: who captured each data point, when, from what source, and whether it was modified.

    1

    Secure connection to Excel / Proceso Manual

    Climatta connects to Excel / Proceso Manual via API or certified connector, installing nothing on your server.

    2

    Automatic module mapping

    Modules Hojas de cálculo Excel and Correo electrónico are automatically mapped to IFRS S1 indicators, with no manual configuration.

    3

    Report ready for assurance

    Complete report in CNBV/CINIF format with traceability of every data point back to Excel / Proceso Manual. The auditor has the evidence they need.

    4 benefits of connecting Excel / Proceso Manual with Climatta

    Time

    From weeks to hours in IFRS S1 data collection from Excel / Proceso Manual

    Risk

    Full traceability: every data point audited back to its source in Excel / Proceso Manual

    Auditability

    Immutable change history — the 2027 auditor approves it

    Cost

    No integration consultancy needed: Climatta connects to Excel / Proceso Manual in 2 weeks

    FAQ — Excel / Proceso Manual + IFRS S1

    We connect with your Excel / Proceso Manual in 2 weeks. No manual integration.

    Over 50 FIBRAs (REITs) companies already report IFRS S1 automatically with Climatta.