Turn travel bookings into a defensible business travel inventory

A business-travel emissions calculation should begin with travel that actually occurred, classified within the inventory boundary. Reconcile bookings, cancellations and expense records before multiplying activity by emission factors. A complete booking export is not necessarily a complete or accurate travel inventory.

This guide is for New Zealand organisations preparing a corporate greenhouse-gas inventory. It provides an original control method for activity data and points to official calculation guidance. It does not determine whether an organisation has a statutory reporting duty.

Keep business travel separate from commuting and company-controlled vehicle use. Match journey activity to the units in the chosen factor. Reconcile overlapping booking and expense records. Explain changes caused by better data or a new method before claiming an emissions reduction.

GHG Protocol Category 6 covers employee business travel in third-party vehicles. Company-owned or controlled vehicle emissions belong in Scope 1 or Scope 2 as applicable; commuting is Category 7. The guidance also describes fuel, distance and spend methods and allows optional hotel emissions. Apply the relevant boundary consistently and explain optional inclusions. GHG Protocol Category 6 guidance

Use a boundary note that a travel coordinator can understand. Identify the reporting entities, period and types of traveller included. Escalate unusual arrangements, such as secondments or contractor travel, to the inventory owner rather than assuming every cost in a travel account is employee business travel.

New Zealand's Ministry for the Environment provides a measuring-emissions guide for organisations. Use its relevant methods and factors where suitable, while documenting the reporting framework and boundary you actually follow. New Zealand measuring emissions guide

Build a record for each relevant journey leg using a stable reference. Capture dates, origin and destination, mode, traveller count where needed, and evidence of cancellation or completion. Minimise personal data in the calculation file; retain a controlled link to supporting records.

A refunded ticket should not remain a completed flight simply because it appears in the original export. Equally, a refund may concern only one leg or a fare adjustment. Resolve the actual travel status instead of treating every negative amount as a journey cancellation.

Check whether an expense claim duplicates an agency booking. A taxi receipt and a flight booking normally describe different legs; two copies of the same flight receipt do not. Record the reason for excluding a duplicate so another reviewer can reproduce the result.

Record the factor source, release, units, transport mode and relevant assumptions. Check whether the activity represents vehicle distance, passenger distance, fuel or spend before applying it. A unit label is part of the calculation, not a formatting detail.

For international travel, do not apply a domestic mode or geography merely because the reporting company is in New Zealand. Retain the route and mode information needed to select a suitable factor. Where the factor requires a travel class or other distinction, document the source of that attribute and how missing values are handled.

The Ministry's 2026 catalogue has release notes and corrections. Record the exact version selected and assess whether a correction affects your calculation. A current catalogue does not automatically mean every factor within it suits every historic journey. New Zealand catalogue release notes

Assume a fictional Auckland business has ten flight-leg records in an agency export. Two were cancelled before travel, one duplicates another booking reference and seven represent completed legs. A separate expense export also contains a receipt for one of those seven.

The team retains seven unique completed legs. It records the cancellation evidence, removes the duplicate booking from the activity total and links the expense receipt as supporting evidence rather than adding another journey. All numbers are illustrative.

Before calculating, it checks whether the distance records already represent each individual passenger. If two travellers have separate records, multiplying the combined distance by two again would overstate activity. No emission factor or observed company result is invented in this example.

Use a fictional journey with two employees travelling on the same 500 km rail leg. The appropriate activity depends on how the export is structured:

These invented inputs demonstrate unit handling, not an actual route or emissions factor. Whichever structure is used, the underlying two completed passenger journeys should lead to the same accepted activity. Applying a factor expressed per passenger-km then requires that unit; a vehicle-km factor needs a different activity interpretation.

The reviewer records the export definition, completed-travel evidence and calculation rule, and tests a cancelled leg separately. A cancellation should remove only the affected activity, not automatically remove the entire multi-leg booking or an unrelated hotel stay. Keep the original export and the accepted journey population linked so that rerunning next month's file does not restore previously excluded duplicates.

Keep missing data visible. If an appropriate estimation method is used, identify the affected journeys and the assumptions, then set a plan to improve the evidence. Do not report an unrecorded trip as zero emissions merely because its distance is unavailable.

Compare successive inventories carefully when the method changes. Moving from spend to distance can change an estimate without any change in actual travel. The broader principle is to distinguish a method change from a real emissions reduction; that linked guide concerns purchased goods and services, so its category-specific calculation methods should not be copied into travel accounting.

They are a starting dataset. Reconcile them with cancellations, changes and other travel records using a process proportionate to the significance of travel in the inventory.

GHG Protocol Category 6 guidance permits optional hotel emissions. Document your chosen treatment and any requirements of the reporting framework you use, and maintain comparability.

A spend method is described in the guidance, but the factor must match the relevant activity and monetary basis. Label the estimate, avoid double counting and seek better activity evidence where it matters.

QSE Advisory is part of the QSE Advisory brand family. Research and drafting were AI assisted. Examples are hypothetical and do not represent client results or firsthand testing. This article provides general information; apply competent review to consequential decisions.

This article is general information. Verify current requirements and seek qualified advice for your specific circumstances.

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