Scope 3 Data Will Never Be Perfect. It Still Needs to Be Defensible.
Perfection is the wrong bar for Scope 3 emissions data. Consistency, documentation, and a clear improvement plan are what assurance providers and counterparties actually look for.
30 January 2026 · 5 min read
Scope 3 emissions are, by nature, estimated from imperfect data: spend-based factors, industry averages, and supplier estimates standing in for activity data that often does not exist yet. That reality leads some organisations to delay reporting Scope 3 altogether, waiting for data quality that may be years away.
Assurance providers and sophisticated counterparties are not expecting precision from Scope 3 figures. They are expecting a defensible methodology: clearly documented category boundaries, consistent calculation approaches applied period over period, transparent disclosure of which categories rely on estimated versus primary data, and a credible plan for improving data quality over time.
Consistency is often more valuable than precision in the short term. A figure calculated the same way every year, with documented assumptions, allows trend analysis and target-setting even while the underlying data quality is still maturing. A figure that changes methodology every cycle undermines both, regardless of how sophisticated any single year's calculation might be.