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From the income statement to the carbon footprint: finance’s guide to ESG reporting

By Ahmed AbdelRahman · Last editorial update: 2026-09-27

How finance moves from expense data to activity and emissions, and what IFRS S1 and IFRS S2 actually require.

Sustainability reporting is no longer a separate story written by public relations. Climate-related risks can affect cash flows, financing, valuation, and operational resilience, making sustainability data a finance and governance issue.

IFRS S1 and IFRS S2: a global baseline, not automatic local law

IFRS S1 sets general requirements for disclosing sustainability-related risks and opportunities that could affect an entity’s prospects, while IFRS S2 focuses on climate-related risks and opportunities. Both are effective for annual periods beginning on or after 1 January 2024, but mandatory application depends on adoption or regulatory requirements in the relevant jurisdiction.

Scope 1, 2, and 3

  • Scope 1: direct emissions from sources owned or controlled by the entity, such as fleet fuel.
  • Scope 2: indirect emissions associated with purchased energy.
  • Scope 3: other value-chain emissions, such as procurement, travel, and cloud services where relevant categories apply.

Software is not “footprint-free” merely because it has no factory. Data centres, employee devices, electricity, travel, and suppliers can all create material impacts. A generic emissions-per-dollar factor for AWS should not be treated as precise fact; supplier-specific data or activity data with credible factors is preferable, with methodology and assumptions disclosed.

The accounting bridge: cost → activity → emissions

The income statement helps locate data sources, but does not produce emissions by itself. Fuel expense is converted into litres using an appropriate price, then multiplied by a factor suitable for the fuel type and year. Electricity expense is converted into kWh, or consumption is taken directly from the bill, before applying the required grid factor or methodology.

Data-quality rule: actual activity data is generally better than spend-based estimation, and supplier-specific data is better than a broad average, provided boundaries and methodology are consistent and verifiable.

Six stages of maturity

  1. Measurement: define boundaries, data sources, baseline year, and relevant scopes.
  2. Disclosure: explain methodology, assumptions, governance, and risks, not a single number.
  3. Targets: establish measurable objectives backed by a plan and resources.
  4. Reduction: change operations, energy, procurement, travel, and design.
  5. Offsets: address residual emissions carefully, rather than replacing reduction.
  6. Integration: bring carbon and climate into project appraisal, risk management, incentives, and decisions.

What is finance’s role?

Finance brings expertise in controls, data ownership, close processes, estimates, documentation, and assurance. But the project should not become an isolated finance spreadsheet: operations, procurement, IT, HR, and sustainability teams own parts of the data and decisions. Finance’s role is to build a source-to-disclosure data chain that can be explained, repeated, and assured.

Bottom line: start with an inventory of emission sources and data, not a software purchase. Define boundaries, methodology, and ownership; produce a traceable baseline; then decide which tools are genuinely needed.
Official referencesIFRS Foundation · IFRS S1IFRS Foundation · IFRS S2