Sustainability-Linked Loans: How They Work and How to Qualify
A sustainability-linked loan (SLL) is a loan whose financial terms, usually the interest margin, move up or down depending on whether the borrower hits agreed sustainability targets. Unlike a green loan, the money is not tied to a specific green project. The borrower can spend it on general corporate purposes, and the reward comes from improving how the whole business performs. This guide explains the mechanics, the market rulebook, the pricing, the verification and what you need to prepare before you approach a lender.
Key Takeaways
An SLL rewards the borrower for hitting predetermined sustainability targets. It does not restrict how the funds are used.
The Sustainability-Linked Loan Principles (SLLP) are voluntary guidelines built on five components: KPI selection, target calibration, loan characteristics, reporting and verification.
Pricing typically adjusts by a small slice of the margin, and a missed target can mean a higher margin, so targets must be realistic as well as ambitious.
Independent verification of performance is expected at least annually, and credibility depends on material targets, not easy wins.
Preparation matters most: clean baseline data, a strategy the targets belong to, and a reporting process an external reviewer can check.
What a sustainability-linked loan is
The market’s reference definition describes an SLL as a loan instrument or contingent facility whose financial or structural characteristics can vary depending on whether the borrower achieves ambitious, material and quantifiable predetermined sustainability objectives, according to the Sustainability-Linked Loan Principles published in March 2025.
In plain terms, you and the lender agree on a few measurable goals, such as cutting Scope 1 and 2 emissions by a set percentage by a set date. If you hit them, your borrowing gets cheaper. If you do not, it may stay the same or get more expensive.
SLLs go by several names: KPI-linked loans, ESG loans or ESG-linked loans. They are most often structured as revolving credit facilities or term loans, and they appeal to companies that want finance linked to their overall transition rather than to one asset.
If you want the wider context on how sustainability-linked debt fits into corporate finance, our own explainer on sustainability-linked debt covers the instruments side by side.
Sustainability-linked loans versus green loans
The two are often confused, and the difference is where the sustainability test sits.
Green loan | Sustainability-linked loan | |
|---|---|---|
What is tested | What the money is spent on | How the borrower performs against targets |
Use of proceeds | Restricted to eligible green projects | Typically unrestricted, general corporate purposes |
Typical reward | Often a fixed price or terms for the project | Margin that adjusts with target performance |
Best suited to | A defined project such as solar, efficient buildings or clean transport | A business-wide transition across operations |
Law firm commentary makes the same point: for an SLL, use of proceeds is not a key determinant of how the loan is categorised. The LMA’s guidance adds that SLLs are typically available for general corporate purposes without use-of-proceeds restrictions.
The same guidance describes SLLs as a transitional tool. They support a borrower as it improves its sustainability performance, and they do not define a specific sustainable economic activity. That matters if you are a high-emitting business: an SLL can reward a credible move toward better performance without requiring that the business already looks green.
The Sustainability-Linked Loan Principles
The SLLP are voluntary recommended guidelines developed by an industry working party. They give a framework for the characteristics and integrity of an SLL. They were first launched in 2019 and have been revised several times, with the latest guidance dated 26 March 2025. The LMA, APLMA and LSTA produced that guidance to help practitioners apply the principles and to promote a harmonised approach.
Two points about their status are worth knowing:
The principles are not law. Market participants apply them deal by deal, so an SLL’s label tells you what the lender intended, not that every term matches the framework.
Because they are voluntary, borrowers who follow them closely tend to find it easier to explain their loan to investors, rating agencies and stakeholders.
The five core components
The SLLP rest on five components: KPI selection, SPT calibration, loan characteristics, reporting and verification. Each one is a place where a deal can be strong or weak.
KPI selection. The key performance indicators must be relevant, core and material to the borrower’s business.
SPT calibration. The sustainability performance targets set how much improvement counts, and they should be ambitious.
Loan characteristics. The financial terms, usually the margin, are linked to whether the targets are met.
Reporting. The borrower keeps lenders informed about performance against the targets.
Verification. An external reviewer checks performance for the dates relevant to a pricing change.
How KPIs and targets are chosen
Start with materiality. According to the IFC, KPIs and targets are selected for their materiality to the borrower’s core business and calibrated against the borrower’s own historical performance and industry peers. Sustainability coordinators and Second Party Opinions help validate that targets are ambitious and credible.
In practice, this gives you a short list of questions to answer before talking to a bank:
Which sustainability issues actually drive risk and value in your business? A logistics firm will look at fleet emissions, a manufacturer at energy and waste, a retailer at supply chain and packaging.
Do you have a baseline? Targets need a starting point, and a baseline with gaps will weaken the whole structure.
What has your own trend been? A target that merely continues a trend you were on anyway is unlikely to be seen as ambitious.
How do peers perform? Benchmarking against peers is part of calibration.
The IFC also notes that about 90 percent of sustainability-linked financing to date has used corporate ESG metrics as targets, with the remaining 10 percent mainly using third-party ESG ratings. So most deals are built on metrics you measure yourself, which makes your data quality central.
The LMA guidance also reminds borrowers that definitions of sustainability may vary by sector and geography. If you operate in both Europe and Africa, for example, think about which metrics make sense in each setting and whether one target can honestly cover both. Our piece on ESG data challenges looks at why that data work is harder than it first appears.
How pricing changes when you hit or miss a target
The financial incentive is the margin. Per the IFC, meeting a target may result in a margin reduction, while missing it may result in an increase. The same note says SLLs typically use a step-down of 5 to 10 percent of the initial margin when a target is met, sometimes combined with a step-up when it is missed.
A worked illustration, using made-up numbers purely to show the arithmetic: if a loan carried an initial margin of 2.00 percent and a 10 percent step-down applied, the margin would fall by 0.20 percentage points, to 1.80 percent. On a £10 million drawn balance, that is £20,000 a year in interest. It is a real saving, but it will rarely be the main reason a company changes how it operates, which is why the targets themselves matter more than the discount.
Other structural points:
Trigger dates. Lenders set test dates within the loan’s life. At the Nordic Investment Bank, for instance, SLLs include trigger dates within the loan tenor when target achievement is assessed and margin adjustments are activated.
Several KPIs. A loan can have more than one KPI, each with its own target and test date.
Two-way benefit. One bank describes the benefit as dual-sided: lower financing costs for the borrower, and measurable improvement in ESG performance.
A practical lesson follows. If a step-up is possible, set targets you can defend internally, with budgets and owners behind them, not targets chosen only because they look good in a press release.
Reporting and independent verification
Under the 2021 version of the SLLP, borrowers should, where possible, provide lenders with up-to-date performance information at least once a year, and must obtain independent external verification of performance against each target at least annually. Verification applies to each KPI for the dates or periods relevant to a possible change in loan terms. A qualified external reviewer carries it out, and limited or reasonable assurance can be used.
One honest complication: the LMA guidance says there is no globally accepted methodology for reporting on targets, so borrowers are encouraged to explain their underlying methodologies and assumptions. Write those down early. A reviewer who cannot reconstruct how a number was calculated cannot verify it.
What this means for your team:
Name one owner for each KPI, with a documented data source.
Keep a methodology note that states boundaries, emission factors and any restatements.
Align your annual sustainability reporting with the loan’s testing dates so the same numbers are not produced twice.
Building an internal process that can stand up to this scrutiny is the same work that underpins a wider ESG strategy, and it pays off beyond the loan.
What makes an SLL credible, and the risks
The IFC links credibility to material, ambitious targets that fit the borrower’s strategy, supported by credible action plans and reporting. The risks it names are greenwashing and reputational damage if targets are missed.
So a well-built SLL tends to share these traits:
KPIs that cover the issues where the business has the largest footprint.
Targets that clearly go beyond business as usual.
A published or at least documented plan explaining how the targets will be reached.
Independent verification and transparent reporting.
Loan terms that change meaningfully when targets are met or missed.
If you are the borrower, treat these as a checklist for your own structure, not just something the bank will examine. A loan that holds up to outside questions is a stronger asset for your reputation.
For a real-world look at how a large energy company approached linking financing to sustainability goals, read our analysis of Eni’s sustainable financing strategies.
Who can get a sustainability-linked loan
There is no single eligibility test, because SLLs are negotiated deal by deal. The principles are guidelines, and each lender applies its own credit criteria on top. That said, the structure of the SLLP tells you what a borrower needs to demonstrate:
Creditworthiness. The loan is still a loan. Lenders assess the usual financial strength, cash flow and security.
Material sustainability issues. You need to show which issues matter for your business and why.
Measurable baseline data. Without historic figures, targets cannot be calibrated.
A strategy behind the targets. Targets sit within a credible plan, with owners and budgets.
Reporting capacity. You must be able to report at least annually and support external verification.
The market has historically been dominated by larger corporates. The IFC’s data shows that since 2017 over $809 billion of sustainability-linked loans and bonds had been issued, with emerging markets representing 5 percent of total issuance. That figure covers the period up to its January 2022 publication. It suggests a large opportunity for borrowers in Africa and other emerging regions who can show credible data and strategy, and our sustainability-linked debt overview outlines where to begin.
Smaller UK businesses should ask their existing bank directly which sustainability-linked or green products it offers, since availability and terms differ by lender and change over time.
A step-by-step route to your first SLL
Map material issues. List the sustainability topics that most affect your costs, risks and customers.
Build the baseline. Gather at least a few years of data for the chosen metrics, and note the gaps.
Draft KPIs and targets. Benchmark against your history and peers, and test them against your budget.
Seek independent input. A Second Party Opinion or an advisory review can strengthen credibility before the lender sees the proposal.
Approach lenders. Share your strategy, your data and your proposed structure, and compare how each handles pricing and test dates.
Agree the reporting calendar. Fix who reports what, when, and who verifies.
Run and review. Track progress quarterly so a trigger date holds no surprises.
How Exereco can help
Preparing for an SLL is mostly a data, strategy and reporting exercise, and that is where we work. Exereco combines sustainability news and analysis focused on Europe and Africa with ESG reporting software, advisory and compliance support, and training. If you are setting KPIs, building a baseline or readying your reporting for external verification, explore how our team can support your climate action work or get in touch through exereco.com.
For more reading on measuring what you report, see measuring ESG impact beyond the numbers.
FAQ
What is the difference between a sustainability-linked loan and a green loan?
A green loan restricts the money to eligible green projects. A sustainability-linked loan is typically available for general corporate purposes, and its terms change according to whether the borrower meets predetermined sustainability targets.
What are the Sustainability-Linked Loan Principles?
They are voluntary recommended guidelines developed by an industry working party. They set out five components: KPI selection, target calibration, loan characteristics, reporting and verification. Lenders and borrowers apply them deal by deal.
How much cheaper is a sustainability-linked loan?
The IFC reports that these loans typically use a step-down of 5 to 10 percent of the initial margin if a target is met, sometimes combined with a step-up if it is missed. The exact figure is negotiated with each lender.
Does a sustainability-linked loan need independent verification?
Yes. Under the SLLP, borrowers must obtain independent external verification of performance against each target at least annually, and limited or reasonable assurance may be used.
Can a business with a high carbon footprint get one?
Potentially. The LMA guidance describes SLLs as a transitional tool that supports a borrower as it improves its performance, rather than one that defines a specific sustainable activity. Lenders will still expect ambitious, credible targets and sound credit.
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