Delivery Emissions Reporting for eCommerce: What Retailers Need to Know About Scope 3 in 2026

For most UK retailers, the parcels leaving the warehouse are the most visible part of the eCommerce carbon footprint and the hardest to quantify reliably. Third-party delivery emissions fall within Scope 3, which reporting standards, investors and large customers now expect retailers to measure properly.

This explainer covers what UK retailers need to know about delivery emissions reporting in 2026, why carrier data is inconsistent, what delivery means for Scope 3, how to report emissions and how multi-carrier management can help.

What the 2026 reporting landscape looks like for UK retailers

The UK Sustainability Reporting Standards were published in February 2026 for voluntary use. The Financial Conduct Authority has proposed making the UK SRS S2 climate disclosures mandatory for in-scope listed companies from accounting periods beginning on or after 1 January 2027, with Scope 3 following a year later on a comply-or-explain basis (FCA, 2026). The FCA’s final rules are expected in the autumn.

Listed retailers are the first wave, but the scope will widen. The government has signalled a consultation on extending the standards to economically significant private companies. Streamlined Energy and Carbon Reporting still requires large companies to report energy use and Scope 1 and 2 emissions, with Scope 3 encouraged.

Fewer UK groups are caught directly by the EU’s Corporate Sustainability Reporting Directive now that its thresholds have risen, but the customers, banks and investors that remain in scope still need supplier data. Requests for carbon reporting on delivery can therefore arrive through tenders even where a retailer has no direct reporting obligation.

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Where carrier data comes from and why it’s inconsistent

Carriers calculate emissions from their own fuel, electricity and fleet data, then allocate the total across the parcels they carry. However, differences in how carriers allocate these emissions can make the resulting data less consistent: one carrier divides by parcel count, another by weight or distance, while some only publish an average per service.

Boundaries differ too. Some figures cover the full journey from collection through linehaul, sortation and the last mile; others cover the final leg alone or exclude fuel production. Where a carrier quotes a carbon-neutral service, ask for emissions before offsets. The Greenhouse Gas Protocol requires Scope 3 emissions to be reported independently of offsets.

ISO 14083 and the Smart Freight Centre’s GLEC Framework give the industry a common method, but adoption is uneven: the BRC’s stocktake found that only 30% of retailers’ very biggest suppliers provide greenhouse gas data at all (BRC, 2025). The practical result is a set of carrier numbers that cannot simply be added together.

Why delivery emissions are the hardest part of retail Scope 3

Scope 3 covers indirect emissions across a business’s value chain, excluding purchased-energy emissions already reported in Scope 2. In retail, they dominate: the British Retail Consortium’s UK Retail 2025 Net Zero Stocktake found that more than 93% of retail emissions fall outside retailers’ direct control, with the least progress made on Scope 3 (BRC, 2025).

Delivery is one of the hardest lines in retail Scope 3 to evidence. Under the Greenhouse Gas Protocol, delivery and returns paid for by the retailer fall into Scope 3 Category 4 (upstream transportation and distribution), while delivery paid for by the customer sits in Category 9.

A retailer shipping at volume typically uses several carriers and dozens of services, leaving delivery data spread across different systems and reporting methods. A managed multi-carrier delivery service can reduce that fragmentation by bringing delivery activity into one environment, giving retailers clearer visibility of parcel volumes, carrier usage and delivery activity across their network. This does not remove differences in how individual carriers calculate emissions, but it provides a more consistent operational dataset to support Scope 3 reporting.

Practical steps to capture, normalise and report delivery emissions

Delivery emissions reporting starts as a data exercise. These steps turn a pile of carrier statements into an eCommerce carbon footprint figure finance can sign off:

Capture consignment-level data: record carrier, service, weight, origin, destination and mode for every parcel and return, taken from the despatch system rather than rebuilt from invoices.

Fix one boundary: report the full journey on a well-to-wheel basis, note where a carrier’s figure covers less and state the method and sources alongside the number.

Rank the data by quality: use carrier-specific figures aligned to ISO 14083 first, network averages second and distance-based estimates from UK government conversion factors last, recording which tier each carrier sits in

Watch the factor year: the 2026 UK government conversion factors moved several van and rigid lorry freight values upwards because observed payloads fell, so an estimate can rise even where volumes did not

Track intensity as well as totals: tracking CO2e per parcel and per pound of revenue can help retailers monitor emissions intensity and assess the impact of changes to the service mix, such as greater use of out-of-home delivery.

Subsequent reporting cycles can be easier once the dataset and method are established, Consistent data also makes it easier to assess the lower-emission delivery services offered at checkout.

How a managed multi-carrier partner centralises the data

GFS is a managed multi-carrier delivery partner, not a carrier. Retailers access 1,000+ delivery services across 220+ destinations through a single integration, so every consignment is created, labelled and tracked in one place. GFS supports retailers by bringing the key consignment-level data into one stream for reporting, including carrier, service, weight, destination and delivery outcome for each parcel and return.

The same delivery data can also help retailers identify opportunities to reduce emissions. GFS’ operations team can consolidate multi-carrier collections and help retailers offer lower-emission delivery options at checkout, including Out-of-Home services. GFS’ account managers match carrier services to retailers’ sustainability goals, giving sustainability and finance teams greater visibility across delivery operations.