What is Scope 3, Category 6?

Scope 3, Category 6 covers emissions from employee business travel in vehicles not owned or operated by the reporting company — including flights, rail, rental cars, rideshare, taxis, and hotel stays. It is one of 15 Scope 3 categories defined by the GHG Protocol and is typically required for comprehensive carbon accounting disclosures.

How do companies calculate business travel emissions?

Most companies use one of two carbon accounting methods: distance-based or spend-based. Distance-based calculations apply standardized emissions factors (from ICAO or DEFRA) to trip data like route and cabin class. Spend-based calculations estimate emissions from total travel expenditure. Distance-based approaches are generally more accurate and more defensible for audit purposes.

What makes business travel emissions hard to measure accurately?

The primary challenges are data fragmentation across booking, expense, and travel management systems and duplication when the same trip appears in multiple platforms. Travel outside approved channels also creates coverage gaps. Many organizations rely on spend-based estimates to compensate, which reduces both precision and auditability.

Which carbon accounting software platforms cover business travel emissions?

Platforms like SAP Concur and Navan, along with travel management companies including American Express Global Business Travel and Corporate Travel Management, provide emissions data at varying levels of detail. Their carbon accounting methods differ — some use distance-based models while others apply fuel-burn methodologies. Evaluating methodology transparency is critical when selecting a platform.

How does business travel data connect to GHG Protocol reporting?

The GHG Protocol's Scope 3 standard includes business travel as Category 6. Companies using GHG emissions management software that integrates with travel booking and expense platforms can automate Category 6 data collection and apply consistent emissions factors, improving both accuracy and efficiency for annual disclosures.

What's the difference between distance-based and spend-based travel emissions calculations?

Distance-based calculations use actual trip data — route, carrier, and cabin class — combined with standardized emissions factors to estimate carbon output. Spend-based calculations use travel expenditure and average emissions intensities. Distance-based methods are more granular and more defensible in audits, but they require structured data from booking systems. Spend-based is accepted under the GHG Protocol when activity data is unavailable.

How can companies reduce Scope 3 Category 6 emissions?

Effective reductions come from embedding emissions guidance directly into booking tools, prioritizing virtual meetings over short-haul travel, and identifying high-emission routes for internal review. Internal carbon pricing and team-level footprint visibility create behavioral accountability. A virtual-first culture, supported by clear policy, typically produces the largest and most durable reductions.

Michael Maduro

Scope 3 business travel: carbon accounting methods that hold up
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Scope 3 business travel: carbon accounting methods that hold up

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Scope 3 business travel: carbon accounting methods that hold up
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Michael Maduro

Scope 3 business travel: carbon accounting methods that hold up

Scope 3 business travel: carbon accounting methods that hold up