Scope 3 supplier data collection and why it’s so hard

If you’ve spent any time chasing Scope 3 supplier data collection, you already know the pattern. A spreadsheet goes out. Some suppliers reply weeks late. Some never reply. The ones who do often send a PDF in a format nobody else uses, with numbers that don’t quite map to your reporting categories. You patch the gaps with estimates, submit what you have, and start the same process again next year.

That’s not just an issue you face. It’s the defining challenge of Scope 3 reporting, and the data backs that up clearly.

The scale of the problem

Scope 3 supplier data collection is hard for a structural reason, not a resourcing one. According to CDP, supply chain emissions typically run more than eleven times higher than a company’s own direct operational emissions. Most of your footprint sits outside your walls, with people who have no obligation to report to you and often no internal system set up to measure what you’re asking for.

Research backs up how widespread the struggle is. In MIT’s 2025 State of Supply Chain Sustainability survey of 1,200 professionals across 97 countries, around 70 percent cited a lack of supplier data as one of their most significant Scope 3 challenges, ahead of methodology complexity, internal expertise and the cost of measurement tools. And despite how central this problem is, many organisations are still running it through spreadsheets, a tool that was never built for collecting structured, comparable data from hundreds of external parties at once.

Why suppliers go quiet

It’s rarely reluctance. It’s friction. Suppliers are frequently fielding near identical requests from multiple customers at once, each in a slightly different format, each asking for the same underlying numbers in a different shape. Faced with a request that takes hours to complete and an unclear sense of whether the data will actually be used, emissions data requests understandably fall down the priority list.

The result is predictable. Low response rates push companies back toward spend-based estimates for the categories that matter most, which satisfies a compliance checkbox but tells you almost nothing about where your actual reduction opportunities are.

Engagement is what gets you the data

Here is the point that often gets lost. Scope 3 supplier data collection is not a data problem first. It’s an engagement problem. The same MIT survey concludes that credible Scope 3 measurement needs stronger supplier engagement alongside better tools and standardisation. Suppliers submit emissions data when four things are true.

You’ve built a relationship. A request from a name they recognise, tied to a contract they care about, gets answered. A cold form from a generic inbox does not. Involving procurement, who already hold the supplier relationship, makes a real difference.

You’ve educated them. Many suppliers, particularly smaller ones, have never measured their emissions. Explain why you’re asking, which numbers you need and how they’ll be used. Ask for what they already know, such as fuel, electricity and vehicle use, rather than expecting carbon expertise.

You’ve made it easy. Every extra field and every unfamiliar term lowers the response rate. Suppliers need a clear path they can finish without a consultant, and someone to ask when they get stuck.

You’ve given them a reason to submit. If a supplier does the work once and sees it disappear into a black hole, they won’t do it again. The strongest incentive is saving them time: submit once and have that data work for every customer who asks. CDP’s guidance on supply chain action makes a related point, that companies need to go beyond collection and set clear expectations with their suppliers.

Why scope 3 supplier data collection can’t wait for a deadline

Under AASB S2, UK SRS, and CSRD, Scope 3 typically carries a grace period. It isn’t mandatory in year one the way Scope 1 and 2 are. That grace period is routinely misread as permission to wait.

Two things make that a costly misread. First, the regulatory clock doesn’t actually pause. Scope 3 becomes mandatory the following year, and supplier relationships, data formats, and internal processes take far longer to build than a single reporting cycle allows. Second, and often more immediate, the business pressure doesn’t wait for the regulation either. Large buyers are already screening suppliers on emissions data in tenders and procurement decisions. If you can’t produce credible Scope 3 numbers, you’re not just behind on compliance; you’re losing contracts to competitors who can.

The urgency here is twofold. There’s a regulatory deadline coming, and there’s a commercial one that’s often already arrived.

Real data, not assumptions

Here’s the part that gets missed in most discussions about fixing this. A lot of platforms respond to the supplier data problem by getting better at estimating around the gaps: smarter models, more sophisticated averages, industry benchmarks dressed up as precision.

eco-shaper takes a different position: an estimate is still an estimate, no matter how well modelled. Every number in eco-shaper’s Supplier Data System traces back to a named, qualified sign-off from the supplier itself, not average data found from scanning online like other companies do, not a model, not a filing pieced together after the fact.

In practice, that means each supplier gets their own secure calculator, enters their own activity data once, and that submission is automatically apportioned across every customer relationship they have, so a supplier working with ten buyers isn’t filling out ten different spreadsheets. The data stays regionally accurate, matched against eco-shaper’s database of regionally specific emission factors, and flows straight into your reporting without a manual reconciliation step.

That design lines up with the four engagement points above. Each supplier gets their own account set up from your supplier list, which is the relationship and the assistance. They enter activity data they already hold, which keeps the ask simple. And the account stays theirs to reuse across every customer who asks, which is the incentive most tools skip.

That’s the actual fix for the supplier fatigue problem described above. Not a better spreadsheet template, but a system that removes the duplication suppliers are tired of in the first place.

If Scope 3 supplier data collection is the gap holding your reporting back, eco-shaper’s Supply Chain Engagement platform is built specifically to close it.

To see how it would work for your actual supplier base, book a call with our team. Or explore more of what eco-shaper does at https://www.eco-shaper.com.