SBTi Scope 3 Reduction Strategies: Practical Levers for Enterprise Teams

SBTi Scope 3 Reduction Strategies: Practical Levers for Enterprise Teams

The Science Based Targets initiative (SBTi) provides measurable criteria for aligning corporate climate targets with climate science. For many companies, the hardest component is Scope 3: indirect emissions across the value chain, from purchased goods and logistics to the use of sold products and investments. These emissions occur outside the company's organisational boundary, but they cannot sit outside its target, investment plan, or performance measurement.

It is particularly important to distinguish between two versions of the standard in 2026. SBTi released Corporate Net-Zero Standard V2.0 on 11 June 2026, but validation against the new version opens on 1 February 2027. Companies submitting or renewing targets in 2026 continue to use the current V1.3.1 and Corporate Near-Term Criteria V5.3.1 (SBTi, Standards and Guidance, 2026). This guide builds an actionable reduction programme under today's criteria while establishing the data and governance foundation for transition to V2.0.

1. Set the Target Boundary Correctly

The first step is not selecting a reduction project but completing a comprehensive Scope 3 screening. The GHG Protocol Corporate Value Chain Standard divides emissions into 15 categories. A company should screen all categories using activity, spend, sector-factor, and lifecycle data; identify relevant categories with a documented rationale; and refine the sources that matter (GHG Protocol, Scope 3 Standard, 2011).

Under the current SBTi near-term criteria, a Scope 3 target is required when Scope 3 represents 40% or more of total Scope 1, 2, and 3 emissions. The target or targets must collectively cover at least 67% of total Scope 3 emissions (SBTi, Corporate Near-Term Criteria V5.3.1; SBTi, Supplier Engagement Guidance, 2023). The percentages answer different questions: the 40% threshold determines whether a target is required, while 67% determines how broad the target boundary must be.

Identify category significance from company data, not a sector assumption. Purchased goods and logistics may dominate for a manufacturer, the use of sold products for an equipment producer, and investments for a financial institution. Consider emissions magnitude alongside reduction potential, data quality, and the company's ability to influence the source.

2. Match the Target Type to the Reduction Logic

Absolute reduction is not the only Scope 3 option under SBTi. The current criteria allow a combination of absolute reduction, eligible sector or economic intensity methods, and supplier or customer engagement targets. The right combination depends on how directly the company can influence and measure the emissions.

• An emissions-reduction target suits categories where operational change can be measured in tonnes of CO2e. Material substitution, product efficiency, and modal shift are examples.
• A supplier-engagement target builds capacity where emissions are distributed across many suppliers and reliable product data is not available in the near term. Under SBTi guidance, the engagement target must be achieved within five years of target submission.
• A customer-engagement target can encourage customers to establish science-based targets for categories involving the processing or use of sold products.

An engagement target does not, by itself, prove a physical emissions reduction. A supplier setting a target is programme progress; real-world reduction must also be tracked through the supplier's inventory and emissions allocated to the purchased product. Mature programmes therefore maintain the engagement metric alongside an emissions-outcome metric.

Teams using an absolute reduction method should also account for the April 2026 technical update. SBTi revised the Absolute Contraction Approach (ACA) for companies setting targets in 2026 and 2027; the updated calculation is applied automatically in validation tools and does not invalidate previously approved targets (SBTi, ACA Update, 2026).

3. Tier the Supplier Programme by Impact

Sending the same questionnaire to every supplier tends to generate a high response count but little decision value. SBTi's Supplier Engagement Guidance recommends ranking suppliers by emissions contribution first; where a credible emissions screening is not yet available, spend can be used as a temporary prioritisation proxy (SBTi, Supplier Engagement Guidance, 2023).

A practical programme can use three tiers:

1. Strategic suppliers: Hold one-to-one discussions on data, targets, and reduction plans with suppliers carrying a large part of the target boundary. Request product carbon footprint data, system boundaries, allocation methods, and verification status.
2. Development cohort: Provide shared training, calculation templates, and office hours. Reassess climate maturity at least annually.
3. Long tail: Continue calculations with secondary factors, moving suppliers into a higher tier when the category grows or data access improves.

Procurement needs to sit at the centre of the programme. Adding target status and data quality to tender scoring, including an annual emissions-data clause in renewed contracts, and training commercial teams creates a more durable process than requests sent by sustainability alone. Do not make sourcing decisions on a badge or declaration alone; review target boundaries, progress, and the quality of submitted data together.

4. Deliver Physical Reductions in Purchased Goods and Product Design

Reduction in Category 1, purchased goods and services, is more than collecting better data. Projects must change the quantity or type of material purchased or the supplier's production route. Design, engineering, and procurement teams can assess the following levers together:

• Reduce material input without compromising quality and safety requirements
• Move to a lower-carbon material or production route supported by lifecycle evidence
• Increase scrap, reuse, or recycled content
• Improve product life, repairability, and remanufacturability
• Support a supplier's energy-efficiency or renewable-electricity project through a long-term offtake commitment

Define the baseline and comparison product before approving each project. A “low-carbon” label is insufficient; the comparison needs the same functional unit, lifecycle boundary, and compatible allocation method. Otherwise, a supplier switch may produce a calculation difference rather than a real reduction.

Where use of sold products, Category 11, is material, the design team should control assumptions for energy consumption, useful life, and regional electricity mix. Efficiency improvement can reduce emissions per product, while total emissions may still rise with sales volume. Track both the absolute total and product-level intensity.

5. Manage Logistics Emissions with Activity Data

For upstream and downstream transportation, Categories 4 and 9, spend data is a weak indicator of fuel and distance change. Move toward a tonne-kilometre model by requesting weight, distance, vehicle or vessel class, load factor, and fuel information from carriers. The GHG Protocol Technical Guidance explains when supplier-specific, hybrid, average-data, and spend-based methods are appropriate for each category (GHG Protocol, Scope 3 Calculation Guidance, 2013).

The reduction sequence typically starts by avoiding or consolidating demand: reduce shipment frequency, increase load factors, and make emergency air freight an exception. Then assess rail or sea transport on suitable corridors, route and warehouse-network optimisation, and finally lower-emission vehicle and fuel options. Where a fuel claim is used, document the lifecycle boundary, certification scheme, and double-counting risk.

6. Measure Data Quality Beyond the “Primary Data Percentage”

Primary data is not automatically accurate data. The GHG Protocol asks companies to consider technological, temporal, and geographical representativeness, completeness, and reliability. An outdated or incorrectly bounded supplier number may be weaker than a suitable industry average (GHG Protocol, Scope 3 Calculation Guidance, 2013).

Maintain at least the following fields for each significant category:

• Calculation method and rationale for selecting it
• Source, period, and boundary of activity data
• Source, version, and unit of the emission factor
• Share of the category calculated with supplier-specific data
• Estimates, exclusions, and uncertainty
• Base-year recalculation policy and triggers

When an improved method lowers reported emissions, that is not automatically a reduction success. Recalculate the base year on a consistent basis or separate the methodology effect from physical performance. This allows teams to explain how purchasing volume, product mix, emission factors, and real reductions contributed to the total change.

7. Design the V2.0 Transition Now

Corporate Net-Zero Standard V2.0 makes implementation and progress management more visible for validation from 2027, introducing company categories, separate Scope 1 and 2 targets, and more detailed transition-plan expectations (SBTi, Corporate Net-Zero Standard V2.0, 2026). Submitting under V1.3.1 in 2026 remains valid, and approved targets retain validity under the transition provisions.

Teams should maintain two parallel files: the validation file under current criteria and a V2.0 gap assessment. If data ownership, target performance, supplier engagement, and evidence of physical reductions are established now, transition to the new version will not become a data-recovery exercise.

Implementation Roadmap

First 90 days: Screen all 15 categories; calculate the Scope 3 share and 67% target boundary; approve the inventory of significant categories, data owners, and methods.

3-12 months: Select target types; launch the strategic-supplier wave; budget physical reduction projects in procurement, design, and logistics; write the base-year recalculation policy.

12-36 months: Increase supplier-specific data in significant categories; scale projects based on emissions outcomes; report engagement progress separately from real emissions change; update the V2.0 transition file.

Action Items

• Verify Scope 3's share of total Scope 1-3 emissions.
• Test that the targets collectively cover at least 67% of Scope 3 emissions.
• Separate engagement targets from physical reduction targets and metrics.
• Segment suppliers by emissions contribution, data quality, and leverage.
• Document the baseline, functional unit, and boundary for every reduction project.
• Connect methodology changes to the base-year recalculation process.
• Maintain a V2.0 gap assessment alongside the V1.3.1 validation file.

References

1. SBTi, “Corporate Net-Zero Standard Version 1.3.1,” 2025.
2. SBTi, “Corporate Near-Term Criteria Version 5.3.1,” 2026.
3. SBTi, “Engaging Supply Chains on the Decarbonization Journey: A Guide to Developing and Achieving Scope 3 Supplier Engagement Targets,” 2023.
4. SBTi, “Corporate Net-Zero Standard Version 2.0,” 2026.
5. GHG Protocol, “Corporate Value Chain (Scope 3) Accounting and Reporting Standard,” WRI/WBCSD, 2011.
6. GHG Protocol, “Technical Guidance for Calculating Scope 3 Emissions,” WRI/WBCSD, 2013.
7. SBTi, “The SBTi Updates the Absolute Contraction Approach,” 2026.