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Scope 3 Emissions: What Australian Procurement Teams Actually Need to Do
For most Australian businesses, the largest portion of their carbon footprint does not come from their own operations. It comes from their supply chain.
Scope 3 emissions, the indirect emissions generated upstream and downstream in a company's value chain, typically account for 65 to 95 percent of total corporate emissions. They include the carbon embedded in purchased goods and services, the emissions from inbound and outbound logistics, the energy consumed in the use of sold products, and the end-of-life treatment of waste.
Until recently, Scope 3 was a reporting aspiration. Something forward-thinking companies measured voluntarily and disclosed in sustainability reports that most investors skimmed and few procurement teams read.
That has changed. Australia's mandatory climate-related financial disclosure regime, underpinned by AASB S1 and AASB S2, requires companies above defined thresholds to report Scope 1, 2 and 3 emissions as part of their annual financial reporting. Group 1 entities (those with revenue above $500 million or existing NGER obligations) commenced reporting in 2025, with Scope 3 required from their second year. Group 2 entities ($200 million revenue threshold) commence from July 2026. Group 3 ($50 million) follows in 2027.
The practical implication is clear. By mid-2026, a large proportion of Australia's major corporates will need credible Scope 3 emissions data. And the function that sits closest to the supply chain data needed to produce that number is procurement.
Why This Lands on Procurement
Scope 3 is fundamentally a supply chain measurement problem. The 15 categories defined under the GHG Protocol's Corporate Value Chain standard read like a procurement taxonomy: purchased goods and services, capital goods, fuel and energy-related activities, upstream transportation and distribution, waste generated in operations, business travel.
For most companies, "purchased goods and services" alone accounts for the majority of Scope 3 emissions. This means that the single most important data source for Scope 3 reporting is the procurement spend data, the supplier base, and the category structure that procurement manages.
The challenge is that procurement functions are not set up for this. They are structured around cost, quality, risk and supply security. Emissions data has not historically been part of the supplier management framework, the tender evaluation criteria, or the contract terms. Adding it now requires changes to processes, systems, supplier engagement and internal capability, all under time pressure.
The Data Challenge: Spend-Based vs Supplier-Specific
There are two broad approaches to calculating Scope 3 emissions from the supply chain, and the choice between them determines how much procurement needs to change.
Spend-based estimation uses industry-average emissions factors applied to procurement spend data. You take your spend by category, apply an emissions intensity factor (tonnes of CO2 equivalent per dollar of spend), and produce an estimate. This approach is quick, requires no supplier engagement, and can be done using existing procurement data.
It is also inaccurate. Spend-based factors are averages that do not reflect the actual emissions profile of your specific suppliers, your specific products, or your specific supply chain configuration. Two companies spending the same amount on the same category can have vastly different Scope 3 profiles depending on where they source, how products are manufactured, and what logistics routes are used.
For the first year or two of reporting, spend-based estimation may be sufficient. The legislation includes a "without undue cost or effort" qualifier, and the modified liability framework protects Scope 3 disclosures from private legal action in the first three years. But spend-based estimation is a starting point, not an end state.
Supplier-specific data is more accurate but much harder to obtain. It requires engaging directly with suppliers to collect their Scope 1 and 2 emissions data (which becomes your Scope 3), product-level carbon intensity data, or life-cycle assessment outputs. For a company with hundreds or thousands of suppliers, this is a significant data collection exercise.
The practical middle ground is to focus supplier-specific data collection on the suppliers and categories that matter most. Research consistently shows that a relatively small number of suppliers account for the majority of Scope 3 emissions. In some cases, 20 suppliers can represent 80 to 90 percent of supply chain emissions. Targeting those suppliers first produces a materially more accurate Scope 3 number without requiring engagement across the entire supplier base.
What Procurement Needs to Change
Moving from "procurement does not deal with emissions" to "procurement collects, validates and reports supply chain emissions data" requires changes in four areas.
Supplier onboarding and qualification. Emissions data collection needs to be embedded in the supplier qualification process. New suppliers should be asked, at the point of onboarding, to provide their emissions data or to confirm their willingness to participate in emissions data collection. For existing suppliers, a structured engagement programme is needed, starting with the highest-spend and highest-emissions categories.
Tender evaluation criteria. For material categories, emissions intensity should be included as an evaluation criterion alongside price, quality and capability. This does not mean that the lowest-emissions supplier automatically wins. It means that emissions are visible in the evaluation, creating a mechanism for procurement to select lower-carbon supply where the commercial trade-off is acceptable.
Contract terms. Contracts with material suppliers should include clauses requiring the provision of emissions data on a defined schedule, in a defined format, with defined methodology. This is the mechanism that turns a voluntary data request into a contractual obligation. It needs to be proportionate (you cannot ask a small SME supplier for life-cycle assessment data) but it needs to exist for your top-tier suppliers.
Category strategy. The category planning process, where it exists, needs to incorporate an emissions dimension. Which categories have the highest emissions intensity? Where are the substitution opportunities (lower-carbon materials, shorter supply chains, different manufacturing processes)? Where does the emissions profile of a category affect the company's transition risk? These questions belong in category strategy, not in a separate sustainability workstream.
The Organisational Question: Procurement or Sustainability?
A common tension in Australian corporates is whether Scope 3 should be "owned" by the sustainability team or the procurement team. The answer is both, but with clear role separation.
The sustainability team owns the methodology, the reporting framework, the external assurance process and the target-setting. They define what needs to be measured and how it will be reported.
Procurement owns the data. They own the supplier relationships through which data is collected. They own the category strategies that determine where emissions reduction opportunities exist. They own the contract terms that create the obligation for suppliers to provide data.
Finance owns the disclosure. The climate statement sits within the annual financial report. Finance needs to be confident that the numbers are robust enough for external assurance.
Where this breaks down is when the sustainability team tries to collect supplier data without procurement's involvement (the suppliers do not respond because they have no commercial relationship with the sustainability team) or when procurement is asked to collect data without a clear methodology (the data comes back in inconsistent formats and cannot be aggregated).
The organisations that are handling this well have established a cross-functional working group with clear accountability: sustainability sets the rules, procurement collects the data, finance validates and reports.
Getting Started Without Boiling the Ocean
For companies that have not yet started, the path forward does not need to be overwhelming.
Step 1: Baseline using spend-based estimation. Use your existing procurement spend data and publicly available emissions factors to produce a first-cut Scope 3 estimate. This gives you a baseline and, more importantly, identifies which categories and suppliers are the largest contributors.
Step 2: Prioritise the top 20 to 50 suppliers. Based on the spend-based analysis, identify the suppliers that account for the majority of your estimated Scope 3 emissions. These are your priority engagement targets.
Step 3: Design the data collection process. Define what data you need from suppliers, in what format, at what frequency, and through what channel. Keep it simple initially. Many suppliers will not have their own emissions data. Providing them with a template and a methodology guide will accelerate the process.
Step 4: Embed in procurement process. Update your supplier onboarding, tender evaluation and contract templates to include emissions data requirements. This ensures that the data collection becomes systemic rather than a one-off project.
Step 5: Improve annually. Each reporting cycle, increase the proportion of your Scope 3 number that is based on supplier-specific data rather than spend-based estimation. The goal is progressive improvement in accuracy, not perfection in year one.
How Trace Consultants Can Help
Trace works with procurement and sustainability teams to build the supply chain data architecture and operational processes needed to meet Scope 3 reporting obligations, practically and proportionately.
Scope 3 procurement readiness assessment: We assess your current procurement processes, data systems and supplier engagement capability against the requirements of AASB S2, and produce a gap analysis and implementation roadmap.
Supplier emissions data strategy: We design the data collection framework, including which suppliers to target first, what data to request, how to standardise inputs, and how to integrate emissions data into existing procurement systems and reporting.
Category strategy integration: We help procurement teams embed emissions as a dimension of category strategy, identifying where supply chain decarbonisation aligns with commercial objectives and where trade-offs need to be managed.
Procurement process redesign: We update tender evaluation frameworks, contract templates and supplier qualification processes to include emissions data requirements in a way that is proportionate and operationally sustainable.
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We help organisations transform ideas into measurable results with strategies that work in the real world. Let’s talk about how we can solve your most complex supply chain challenges.





