A company with no duty to publish its carbon footprint can still be asked for one by the bank that lends to it. The request travels through the banking relationship, so it can reach the treasurer before the sustainability team has heard a word about it.
The reason sits in the lender’s own books. Financed emissions are the share of a borrower’s greenhouse gas output that a bank attributes to itself in proportion to the money it provides, and banks report them under Scope 3, Category 15, which covers investments. The Partnership for Carbon Accounting Financials (PCAF) sets out the accounting method, and its third edition, released in December 2025, now spans ten asset classes. PCAF calls financed emissions the largest share of a financial institution’s climate impact.
How a Plant’s Fuel Bill Reaches a Bank’s Carbon Accounts
Picture a manufacturer with a term loan. The gas its boilers burn sits in its own Scope 1 figures, and the electricity it buys counts as Scope 2. Its lender then takes a slice of both, sized by the loan’s share of the company’s total debt and equity, and books that slice as its own.
The request can reach further down the value chain. For listed shares and corporate bonds, PCAF’s sector-by-sector phase-in of the borrower’s own Scope 3 is now complete, so the standard expects it in every sector. A finance team handed a loose request for “carbon data” should pin down which scopes, which group companies and which reporting year the bank actually wants before paying for anything wider.
One Bank, Two Reasons to Ask
In the European Union, the European Banking Authority’s guidelines on managing ESG risks have applied since January 11, 2026. Small and non-complex institutions have until January 11, 2027 at the latest. The guidelines govern how banks identify, measure and monitor these exposures, and they place no reporting duty on borrowers. Even so, an advisory summary of the guidelines lists greenhouse gas emissions and energy consumption among the data points banks are expected to gather. Proxies are allowed where information is thin, as long as their use shrinks over time.
A single number can therefore do two jobs inside one institution. The sustainability side wants it for portfolio carbon accounts. Credit officers want to know whether carbon costs or transition pressure could affect a company’s ability to repay. For a CFO, the first useful question is which of those purposes a request serves, or whether it also feeds a sustainability-linked product, because each calls for a different level of care.
Central banks are looking at the same numbers from the top. The Bank of England’s 2026 climate disclosure, published in June, says the carbon intensity of its financial counterparties is driven almost entirely by Scope 3, reflecting the real-economy businesses those institutions lend to. Since 2026 the central bank has also folded climate scenario estimates into its in-house credit ratings for sovereign issuers and financial counterparties. Those ratings set exposure limits and the capital it holds. A factory’s fuel use, in short, can surface two levels above the bank that financed it.
Saying Nothing Still Produces a Number
A borrower that sends nothing does not drop out of the calculation. Banks estimate, and PCAF grades each figure with a data-quality score from 1 to 5. A financed emissions methodology published by BMO, a document the bank issues about its own reporting, shows the ladder in practice. Verified reported emissions earn a 1, and reported figures without verification earn a 2. Estimates built from physical output such as production volumes score 3. Revenue-based estimates score 4, while emissions calculated per dollar of outstanding loan score 5. For its general business and government lending, the document states that every borrower is calculated at score 5.
Sending real operating figures replaces a sector average with the company’s own facts, which helps when a business runs cleaner than its peers. It does not guarantee a smaller number. A fuller accounting can surface sites or activities nobody had counted before, and the weaknesses auditors keep finding in corporate emissions data show up just as readily in figures sent to a lender. Anything released should state its reporting period, the entities it covers and the method behind it.
The Facility Agreement Sets the Stakes
A questionnaire by itself changes neither the margin nor the default provisions. Those consequences live in the loan documents, and the commitment can range widely. Answering a one-time request is a modest job. Signing up to report every year creates a deadline someone has to own, while a margin linked to emissions goes furthest, because operating results then move the cost of borrowing.
Before agreeing to anything continuing, treasury and legal teams should know when figures are due and which group companies they cover. They should also find out whether the bank will accept estimates or expects outside assurance, since assurance adds cost. Where emissions performance moves the margin, the documents should also say how acquisitions, disposals and changes in method will be treated. Without that language, a recalculated emissions baseline after a deal can look like a swing in performance when nothing at the plants has changed.
Open Questions for Borrowers and Their Banks
A borrower may not know what estimate its bank has already assigned, and it is not always clear how an inaccurate one gets corrected. It is also uncertain whether better data will earn better lending terms, because a PCAF score measures confidence in a figure and says nothing about the strength of the company behind it.
None of that stops a company from preparing. One approved set of figures, with its evidence, exclusions and a named person cleared to release it, lets the same numbers go to lenders and customers without contradiction. It also leaves the company better prepared as insurers reprice environmental exposure. Comparing lender requests with the obligations in the 2026 corporate disclosure landscape shows where one piece of work can serve several audiences. A treasurer can also ask the bank directly what score it has assigned the company so far, and whether better figures would change it.
