Scope 3 Category 1: Why Supplier Data Is Still Mostly Estimated
Most brands estimate purchased-goods emissions from spend and averages. What that does to the numbers, what the CSRD and SBTi actually require, and what a supplier can provide.
Brands ask factories for more certificates and data. What the evidence says about who pays, where purchasing practices are improving, and what the EU due diligence law actually requires.

Factories that supply brands are asked for more every year: certificates, audits, emissions data, chemical records. The question is who pays. The earlier version of this article answered with survey figures (71% of suppliers reporting more requirements, 18% receiving extra pay) that I could not verify, so I removed them. The evidence I could confirm shows a mixed picture: brands' purchasing practices are improving in some respects, while support for the cost of climate and compliance work is thin.
| Finding | Source | Reading |
|---|---|---|
| True Partner ratings of buyers rose 5% compared with 2024. Nearly 74% of suppliers rated buyers True Partners on fair financial practices. Audit duplication remains a priority | Better Buying Snapshot Survey 2025, published 30 January 2026: 974 supplier ratings from 51 countries, softgoods only | Purchasing practices are improving, and suppliers still want fewer duplicate audits |
| Only 6 of 42 fashion brands reported project financing for supplier decarbonisation. About half offered some support, mostly assessments, audits or small pilots | Stand.earth fashion scorecard, 2025, via Thomson Reuters Foundation | Few brands fund the supplier changes behind their climate targets. Stand.earth is an advocacy group |
| 63% of suppliers say brands expect more sustainability while squeezing margins | Vogue Business survey, quoted on a Better Buying webinar page | Cost pressure is widely felt. I could not see the method |
| A $4.8 billion investment gap for Bangladeshi suppliers to halve emissions by 2030 | Apparel Impact Institute estimate, as reported by the Thomson Reuters Foundation | An estimate by an industry body, not a measurement |
Taken together, these do not show that every supplier is squeezed. Buyers rate better on fair payment and planning than before, according to suppliers who answered the Better Buying survey. The squeeze is sharper where the requirement is new and costly, such as decarbonisation, and where support is not part of the commercial terms. The Better Buying survey did not report figures on who pays for sustainability requirements, so I cannot say how often suppliers carry that cost. The earlier cost range of $25,000 to $40,000 a year for certifications also had no source, and I removed it.
A brand's sustainability team sets requirements, while sourcing and merchandising teams set prices and are judged on cost per unit. Unless there is a mechanism that carries the cost of a requirement into the purchase terms, the requirement arrives without payment. This is my reasoning about how procurement is organised, not a measured finding.
There is also a data quality risk. If a supplier does the minimum to pass an audit or complete a questionnaire, the data it gives will be coarse, for example annual energy totals instead of monthly records. That makes it less useful to a brand that needs primary data for its own reporting. This too is a reasoned argument, and I have no figures on how common it is.
Some brands link supply chain finance to supplier performance, offering cheaper financing to suppliers that meet sustainability criteria. The earlier version named Patagonia, H&M Group and Gap as running such programmes. I could not confirm this, so I removed the names. If a customer offers financing, check the terms: who provides it, which suppliers qualify, whether the rate is tied to a performance measure, and whether the discount is guaranteed on every order.
The earlier version said Article 7 of the CSDDD requires fair pricing so that suppliers can meet the standards imposed on them. That is not what I found. In the original text of the directive (Directive (EU) 2024/1760), the prevention measures are in Article 10, and they include:
CSDDD Article 10, as originally adopted
I did not find a general rule requiring "fair pricing". Recitals encourage responsible purchasing practices, and one recital mentions large food processors and retailers. Omnibus I has since changed the CSDDD: it now covers EU companies with more than 5,000 employees and more than €1.5 billion in turnover, with companies complying from 26 July 2029, and it limits information requests to smaller partners. I did not check whether Omnibus I changed the wording of Article 10, so check the consolidated text before quoting the numbers above.
Treat compliance costs as a commercial item. List certificates, audit fees, data systems and staff time for each customer, and raise the total in negotiations before the order is placed. If the customer is in CSDDD scope and you are an SME, the verification cost provision may be relevant to the conversation, subject to the final text.
Steps
The evidence I found shows limited financing: only 6 of 42 brands reported project financing for supplier decarbonisation in a 2025 scorecard. I could not find reliable figures on how often suppliers are paid more through prices.
In one survey, yes. The Better Buying Snapshot Survey 2025 found the share of buyers rated True Partners rose 5% compared with 2024, and nearly 74% of suppliers rated buyers True Partners on fair financial practices.
I did not find a general pricing requirement. The original text requires support for SME partners where compliance would threaten their viability, and says the company bears the cost of independent verification for SMEs. Check the text as amended by Omnibus I.
I would not do it silently. Record the costs and raise them in negotiations, since you cannot recover a cost that no one has seen.
Cascale, Responsible Purchasing Practices Improving in Consumer Goods Supply Chains (30 January 2026), on the Better Buying Snapshot Survey 2025. Thomson Reuters Foundation (Context), Fashion brands drag feet on their green promises (30 June 2025), on Stand.earth's scorecard and the Apparel Impact Institute estimate. Innovation Forum, Better Buying 2025 insights, for the Vogue Business figure. Ethical Trading Initiative, Purchasing practices and European legislation, quoting Directive (EU) 2024/1760. Clifford Chance, Omnibus I summary (February 2026). Some sources are advocacy or adviser summaries; confirm each in the original.

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Most brands estimate purchased-goods emissions from spend and averages. What that does to the numbers, what the CSRD and SBTi actually require, and what a supplier can provide.
The evidence on green premiums in B2B textile sourcing is thin and points to costs falling on suppliers. Here is what I could confirm, what I could not, and where a supplier's data does have a price.