Closing the SLMR Gap

While ratchets are now widely included in term sheets, this often reflects optionality rather than execution. KPIs are frequently finalised late, deferred, or never activated. 

Even where they are agreed, many lack materiality to the borrower’s business, limiting their ability to drive meaningful behaviour change or strengthen credit quality.

This matters because private credit managers often have limited influence over borrower behaviour. SLMRs provide a practical way to link pricing to performance and reward progress, while supporting risk management, sponsor relationships, and fundraising with LPs. For sponsors and borrowers, they offer a route to lower financing costs while signalling disciplined sustainability management.

The defining challenge is therefore closing two gaps: between inclusion and activation, and between ambition and materiality. This requires clear internal ownership, credible KPI design, robust data, and early alignment across sponsors, co-lenders, and verifiers.

This paper sets out a practical roadmap to close these gaps and turn SLMRs from term sheet features into credible, decision useful pricing mechanisms.

The ratchet is tightening

Sustainability-linked margin ratchets (SLMRs) had their moment in the spotlight. Welcomed as a clever way to link sustainability performance to pricing by rewarding borrowers for meeting sustainability targets and giving lenders a visible proof point of ESG integration, they quickly became the mid-market darling of private credit.

That initial 2021-2022 boom was followed by growing scrutiny. At its peak, ESG-linked structures accounted for roughly 50% of European direct lending issuance in 2021, reflecting how rapidly sustainability-linked pricing mechanisms were adopted across the market. LPs, regulators, and the media began to call out weak structures, vague KPIs, and claims of sustainability outcomes that did not hold up under pressure. Some of those greenwashing accusations were justified: many ratchets lacked ambition, measurability, or meaningful consequences.

In response, some GPs quietly dropped the idea, citing complexity or cost, while others doubled down. However, the idea was not abandoned, but rather continued to be refined by a number of firms who were committed to credible SLMRs. Market data suggests that this group of lenders has become increasingly influential: the five most active European direct lenders accounted for roughly 55.9% of ESG-linked lending activity in 20253, according to Debtwire rankings. Rather than focusing on selling the merit of the concept, they worked to refine SLMRs. They developed clearer frameworks, strengthened governance, and coordinated earlier with sponsors, borrowers, co-lenders and verifiers. The focus shifted from marketing to meaning, using SLMRs as a genuine tool for engagement and sustainability progress rather than “ESG window dressing.”

While headline adoption has fallen, more recent reported uptake figures tell only part of the story. Across the market, many lenders now regularly include ESG or sustainabilitylinked ratchets in their term sheets, with portfolio coverage rates often cited between 60–80%.4 Yet inclusion in term sheets does not always mean follow-through. In practice, some ratchets remain symbolic, with KPIs finalised late or never formally activated, limiting their actual impact.

SLMRs are increasingly being used as a behavioural tool to influence borrower conduct, strengthen risk management, and meet investor expectations. What matters now is not how many loans reference a ratchet, but how many follow through with credible, measurable implementtation. When  designed thoughtfully, SLMRs move beyond symbolism to become mechanisms that drive genuine sustainability progress and unlock tangible value for both lenders and sponsors.

The practical upside of credible SLMRs for private market players

As SLMRs mature from concept to common practice, their value is becoming clearer. When designed well, they align financial and sustainability performance in ways that strengthen both credit quality and relationships across the deal chain.

In tighter credit markets, where  borrowers are facing tougher conditions when raising capital, ESG-linked terms can act as a differentiator. They can help borrowers access more attractive pricing, while reinforcing the lender’s credibility with investors and co-lenders alike.

With rising scrutiny on pricing terms and the credibility of sustainability commitments, and with every basis point under pressure, SLMRs are emerging as a hallmark of thoughtful, modern credit structuring. The challenge now is to ensure they represent real substance, not just signalling, and that firms know how to manage them well.

In this context, private credit firms are not just passive participants in SLMRs. They are increasingly shaping the terms, expectations and outcomes. This position requires both strategic thinking and strong internal governance.

For private credit lenders

• Gives lenders a practical way to influence borrower behaviour without taking equity control
• Links pricing to sustainability performance in a way that supports risk management and credit quality
• Provides a clear signal to LPs that ESG is built into deal terms, not handled separately
• Can make lenders more attractive partners for sponsors, supporting relationships and repeat deal flow in competitive processes

For private equity sponsors

• Helps portfolio companies reduce financing costs, freeing up capital for investment and growth
• Reinforces disciplined sustainability management that supports long-term value creation
• Shows LPs that ESG is integrated into financial strategy, not just portfolio operations

"Private credit firms are not just passive participants in SLMRs. They are increasingly shaping the terms, expectations and outcomes."

From leader to gatekeeper

Private credit firms take different roles in SLMR negotiations

In practice, private credit firms rarely wear just one hat when it comes to sustainability-linked margin ratchets. Both roles carry weight: one sets the ambition, the other safeguards integrity.

Either way, credibility is on the line. To succeed, credit managers need the knowledge, tools, and confidence to propose KPIs that are material and
defensible, and hold the line under scrutiny from borrowers, co-lenders, and the inhouse Investment Committee. They also need the fluency to interrogate others’ structures, benchmark ambition, and spot weaknesses without stalling the deal.

Most private credit firms are somewhere along this journey. In reality, many can perform one role but not the other. The good news: the barriers are common and increasingly solvable, but they must be tackled head on.