What is a sustainability-linked loan?
A sustainability-linked loan (SLL) changes a financial or structural loan term according to performance against agreed key performance indicators (KPIs) and sustainability performance targets (SPTs). The proceeds usually remain available for general corporate purposes. This makes an SLL different from a green loan, which restricts proceeds to eligible projects. Keslio's guide to sustainable financing compares the main instruments.
The voluntary Sustainability-Linked Loan Principles (SLLP), dated 26 March 2025, cover five components: KPI selection, SPT calibration, loan characteristics, reporting, and verification. KPI-linked financing follows the same basic structure: a defined performance result controls a pricing or other contractual consequence.
Why does a sustainability-linked loan matter to you?
Your lender or arranger will ask why each KPI is material to your business, how you calculated the baseline, how the target exceeds business as usual and regulatory requirements, and when it will be tested. A verifier will need the source data, methodology, scope, calculations, and target result. The lenders then evaluate the verified result against the KPI and SPT before the contractual consequence is applied.
Weak definitions create disputes. If the loan agreement does not state the KPI boundary, baseline period, SPT observation date, reporting deadline, margin adjustment, and rules for acquisitions or other recalculations, two teams can calculate different answers from the same year.
How does a sustainability-linked loan work?
First, the borrower and lenders select one or more KPIs that are core, material, consistently measurable, externally verifiable where feasible, and benchmarkable. Second, they set ambitious SPTs. The SLLP recommend at least three years of measurement history where feasible and normally an annual SPT for each KPI during the loan term.
Third, the agreement states what changes when each SPT is met or missed. A margin reduction and increase are common, but the exact adjustment is contractual. Fourth, the borrower gives lenders updated KPI information and a sustainability confirmation statement at least annually and whenever a test can change the loan terms. Fifth, a qualified external reviewer verifies performance against every relevant SPT and KPI through the last trigger event. Where appropriate, a pre-signing review is recommended; post-signing verification is required for SLLP alignment.
What mistakes should you avoid?
- Choosing a convenient KPI that is not material to the borrower's core business or industry impacts.
- Setting an SPT below an existing regulatory requirement or without a dated baseline and benchmark.
- Leaving the observation date, annual target, reporting deadline, adjustment amount, or recalculation rule out of the loan documents.
- Applying a margin change from an internal dashboard before the required external verification is complete.
Is a sustainability-linked loan the same as a green loan?
No. A green loan qualifies through the eligible projects financed and requires proceeds tracking. An SLL qualifies through the borrower's performance against KPIs and SPTs, so its proceeds can usually support general business spending.
What do you send when a lender asks for SLL evidence?
Send the signed KPI and SPT schedule, baseline workbook, methodology note, source-data file, annual sustainability confirmation statement, and external verification report. Reconcile the verified result to the margin calculation and keep the notice sent to the facility agent.
Can you use an SLL without three years of KPI data?
Possibly. The SLLP recommend a three-year measurement record where feasible, but the accompanying guidance says missing history should not by itself block a transaction. You still need a defensible baseline, a material KPI, and a target that lenders can judge as ambitious for your sector and location.