Sustainability-Linked Loans: KPIs, Ratchets and Risks

Sustainability linked loans: the short answer

Sustainability linked loans are general-purpose loans whose pricing or other terms change depending on whether the borrower meets predefined sustainability performance targets. Unlike green loans, the proceeds need not be used for green projects; what matters is the borrower's performance against key performance indicators (KPIs) that are material to its business. The market standard is the Sustainability-Linked Loan Principles published by the Loan Market Association (LMA), the Asia Pacific Loan Market Association and the Loan Syndications and Trading Association, most recently updated on 26 March 2025.

The Principles rest on five core components: selection of KPIs, calibration of sustainability performance targets (SPTs), loan characteristics, reporting and verification. There is no German or EU statute that regulates these loans as such; they are contractual products under German or English law. Their legal risks lie in drafting, in the integrity of data and in reputational and legal exposure if the structure is perceived as greenwashing.

Green loans versus sustainability-linked structures

For bonds, the EU Green Bond Standard under Regulation (EU) 2023/2631 has applied since 21 December 2024. It is voluntary and covers bonds, not loans, although it also provides optional disclosure templates for sustainability-linked bonds. Loan markets continue to rely on the industry principles. See our article on green bonds and the EU Green Bond Standard.

KPIs and targets in sustainability linked loans

The credibility of sustainability linked loans depends on the KPIs and targets. Under the Principles, KPIs must be material to the borrower's core sustainability and business strategy, measurable or quantifiable on a consistent methodological basis and capable of being benchmarked. Common examples are scope 1 and 2 greenhouse gas emissions, scope 3 emissions for some sectors, renewable energy share, water use, waste, safety rates and diversity metrics. A KPI that covers only a small part of the business, or one that the borrower would meet anyway, undermines the structure.

SPTs must be set in good faith and be ambitious: the 2025 Principles state that they should represent a material improvement and go beyond a business-as-usual trajectory and regulatory requirements. They also recommend an annual SPT for each KPI for each year of the loan term, a historical track record where feasible and benchmarking against peers or science-based references. Targets are set before or at origination, and the documentation should state when baselines are recalculated, for example after acquisitions or methodology changes.

Margin ratchets and loan characteristics

The economic incentive is usually a margin ratchet: if the borrower meets its SPTs on a test date, the margin decreases; if it misses them, the margin may increase. Many facilities use a two-way ratchet, some include a neutral zone, and some leave the margin unchanged if no compliance certificate is delivered. The adjustment is typically small compared to the overall margin, which raises questions about whether it changes behaviour, but it creates a contractual and public commitment.

Drafting points for sustainability linked loans include:

• clear definitions of each KPI, the calculation methodology and the reporting boundary;
• the test dates and the period to which the adjustment applies;
• the consequences of missing or late reports and of a failed verification;
• recalculation mechanics after mergers, disposals or changes in methodology;
• whether a failure to meet SPTs is merely an economic matter or has further consequences; market practice treats it as a pricing matter rather than an event of default;
• how margin savings are used, for example whether borrowers or lenders commit to reinvest or donate them.

Under German law, a margin ratchet in a loan agreement under § 488 of the German Civil Code (Bürgerliches Gesetzbuch, BGB) is a matter of contractual freedom. Where terms are standardised and imposed by one side, the rules on standard business terms in §§ 305–310 BGB must be considered, in particular transparency, although these rules are applied with restraint in agreements between businesses.

Reporting and verification

Borrowers under sustainability linked loans must report at least annually on their KPI performance, providing up-to-date information and a sustainability confirmation statement. The 2025 Principles require independent and external verification of performance against each SPT for each relevant period, at least until the last SPT trigger event, and recommend a pre-signing external review such as a second-party opinion. Information that has already been verified through public annual or regulatory reporting does not need to be verified again.

Verification is often performed by an auditor or a specialised provider. The engagement letter should define the scope (limited or reasonable assurance), the standards applied and the timing relative to the test dates. Where the borrower is subject to CSRD assurance, the loan verification can build on it.

Greenwashing risks in sustainability linked loans

Sustainability linked loans attract scrutiny because they combine financial benefits with sustainability claims. Risks include weak KPIs, unambitious targets, selective reporting and inaccurate data. Legal consequences may arise on several levels:

• Contract. Incorrect KPI reporting may breach information undertakings and representations and trigger contractual remedies, including recalculation of the margin and, in serious cases, default provisions.
• Unfair competition. Public statements about a "green" or "sustainable" financing may be environmental claims under the Unfair Competition Act (Gesetz gegen den unlauteren Wettbewerb, UWG) as amended to implement the EmpCo Directive; see green claims after EmpCo.
• Capital markets. For listed borrowers, statements about financing and targets must be accurate in periodic reporting and ad hoc disclosures.
• Reputation. NGOs and the media increasingly analyse sustainability-linked structures and criticise weak targets.

Lenders also face greenwashing risks when they market their sustainable finance volumes, and banking supervisors expect banks to manage climate and environmental risks. Lenders therefore increasingly insist on robust KPIs and external review.

For borrowers, the best protection is internal discipline: a documented data process, clear ownership of each KPI, internal controls comparable to those for financial data and early involvement of the verifier. Public communication about sustainability linked loans should be factual, mention the KPIs and targets and avoid general claims such as "green company" or "climate-neutral financing" that the structure cannot support.

Disputes about KPI performance

Disagreements may arise when data turn out to be wrong, when methodologies change or when the borrower's structure changes. Typical questions are whether a margin step-down was granted on the basis of incorrect figures, whether the lender can claim back interest, and whether a recalculation of the baseline was justified. Facility agreements should therefore contain a clear mechanism for correcting errors, including retrospective adjustment of the margin, and a process for agreeing methodology changes with the agent or a majority of lenders. Where the agreement is silent, the general rules on contract interpretation and unjust enrichment apply, which makes outcomes less predictable.

Borrowers should also consider how much discretion they leave to the lenders. A clause allowing lenders to reject any recalculation without reasons creates uncertainty, while a clause permitting unilateral changes by the borrower undermines credibility. A balanced approach ties recalculations to objective triggers, requires verification of the new baseline and lets an independent expert decide disputes about methodology.

Sustainability-linked Schuldschein loans

The German Schuldschein market has adopted green and sustainability-linked formats. A sustainability-linked Schuldschein loan works like its syndicated counterpart: the coupon changes depending on SPT performance. Because Schuldschein loans are often placed with a broad group of institutional investors, the terms must be standardised, transparent and simple to administer. The arranger typically coordinates the second-party opinion and the reporting to investors. The same principles on KPIs, targets and verification apply, and investors increasingly compare frameworks across issuers.

The process from framework to signing

Arranging sustainability linked loans usually follows a structured process, which starts long before the term sheet:

1. Strategy. Identify the material sustainability topics and existing targets, for example from the transition plan or the CSRD double materiality assessment.
2. KPI selection. Choose one to three KPIs that are material, measurable and backed by historical data.
3. Target calibration. Set annual SPTs that go beyond business as usual and benchmark them.
4. External review. Obtain a second-party opinion where appropriate.
5. Documentation. Negotiate the sustainability schedule, margin ratchet, reporting and verification provisions.
6. Ongoing compliance. Implement internal processes for data collection, verification and annual reporting.

Illustration: a hypothetical Mittelstand manufacturer with a EUR 300 million revolving credit facility selects two KPIs: scope 1 and 2 emissions intensity and the share of renewable electricity. It sets annual targets aligned with its published transition plan, obtains a second-party opinion and agrees a two-way ratchet. When it acquires a competitor in year two, the recalculation clause allows the baseline to be adjusted, avoiding a dispute about whether the targets are still met.

Transition finance

Companies in emission-intensive sectors often find it hard to meet green loan eligibility criteria but need financing for their transition. The loan trade associations have published guidance on transition loans, and many borrowers combine sustainability-linked structures with credible transition plans. Under the CSRD and the ESRS, large companies disclose transition plans for climate change mitigation, which lenders increasingly use as a reference for KPI selection and target ambition.

Lenders should also consider their own regulatory position. Banks must integrate climate and environmental risks into risk management, and sustainable finance volumes feed into their own disclosures. Overstating the sustainability characteristics of a loan portfolio creates supervisory and reputational risks. This is one reason why lenders now push back on weak KPIs during negotiations.

Finally, sustainability-linked structures are increasingly found in other instruments: hedging transactions linked to the same KPIs, supply chain finance programmes rewarding suppliers' sustainability performance and leases. The same principles of materiality, ambition and verification apply, and documentation should be consistent across instruments to avoid conflicting KPI definitions.

How TRW & Co helps with sustainability-linked finance

We advise borrowers and lenders on green and sustainability-linked loans, Schuldschein loans and bonds. We help select and define KPIs, negotiate SPTs, margin ratchets and reporting covenants, align the documentation with CSRD reporting and the Principles, and review marketing statements for greenwashing risks. In disputes about KPI reporting or margin adjustments, we represent clients in negotiations and proceedings. Our work connects with our lending and acquisition finance and sustainability reporting practices. See also Schuldschein loans explained. To discuss a transaction, contact us.