How do sustainability-linked loans and bonds work, and how do they differ from green bonds?
A core Corporate Treasury interview question — asked in analyst and associate interviews across IB, PE, and the Big 4.
THE SHORT ANSWER
A green bond/loan is use-of-proceeds financing: the money must be spent on defined green/eligible projects, with reporting on the allocation. A sustainability-linked instrument is different — the proceeds are general-purpose, but the financial terms are tied to the issuer hitting predefined sustainability performance targets (KPIs/SPTs), typically a margin step-up (you pay more) if you miss the targets and sometimes a step-down if you beat them. So green = where the money goes; sustainability-linked = whether you achieve outcomes, with a pricing incentive. For a treasurer the SLL/SLB offers flexibility (no ring-fencing of proceeds) and can broaden the investor base and modestly improve pricing, but it imposes real obligations: ambitious, externally verified KPIs, annual reporting and assurance, and reputational ('greenwashing') and financial risk if targets are missed or seen as too soft. Frameworks (ICMA principles, LMA) and a second-party opinion underpin credibility. The key exam distinction is use-of-proceeds (green) versus KPI-linked pricing (sustainability-linked).
WHAT INTERVIEWERS LISTEN FOR
- ✓Green: use-of-proceeds tied to eligible projects
- ✓Sustainability-linked: general-purpose, terms tied to KPI/SPT achievement (margin step-up/down)
- ✓SLL/SLB gives flexibility but needs ambitious, verified KPIs + reporting
- ✓Greenwashing/reputational risk if targets weak or missed
COMMON MISTAKES
- ✗Confusing green (use-of-proceeds) with sustainability-linked (KPI)
- ✗Ignoring the margin ratchet mechanism
- ✗No mention of verification/greenwashing risk
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