How are sustainability-linked bonds structured?

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AcadiFi · Accepted Answer

Sustainability-Linked Bonds (SLBs) are general corporate purpose bonds whose financial/structural characteristics vary based on achieving pre-defined sustainability performance targets (SPTs). Unlike green bonds, proceeds are NOT earmarked; the accountability mechanism is structural.

ICMA Sustainability-Linked Bond Principles (SLBP) framework components:

1. **KPIs**: Relevant, measurable, externally verifiable metrics. E.g., scope 1+2 GHG intensity, % women in leadership, water use per unit output.
2. **SPTs**: Ambitious, quantifiable targets with defined deadline (e.g., reduce GHG intensity 35% vs. 2020 baseline by end of 2028).
3. **Bond characteristics variation**: Typically a coupon step-up (25-75 bps) if SPT missed, effective from observation date until maturity.
4. **Reporting**: Annual KPI performance.
5. **Verification**: Independent third-party assurance at SPT observation date.

Example: Verovio Steel issues a €400M 7-year SLB at 4.85% coupon. SPT: reduce scope 1 emissions intensity (tCO2e per tonne steel) by 28% by 2028 vs. 2022 baseline. Observation date: Dec 31, 2028. Step-up: +50 bps if SPT missed.

If missed: from 2029 forward, coupon becomes 5.35% until maturity. Remaining coupons: 4 payments × €400M × 0.5% = €8M total additional interest cost (versus the potential value destroyed by abandoning climate commitments).

Criticism:
- SPTs sometimes unambitious ('business as usual').
- Step-ups small relative to cost savings from not investing in abatement.
- Calibration difficulty without robust transition plan.

SLBs are attractive to issuers whose business mix doesn't fit green/social categories (diversified industrials) but want to signal commitment.

How are sustainability-linked bonds structured?

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