Stronger Penalties and Timely Targets Could Make Sustainability-Linked Bonds More Effective

New research highlights structural flaws in sustainability-linked bonds that weaken their ability to promote meaningful environmental and social outcomes.

Sustainability-linked bonds are gaining attention as a way to encourage companies to meet environmental goals. This matters because private sector participation is crucial to achieving meaningful progress on sustainability challenges.

Sustainability-linked bonds contain financial incentives which encourage issuers to fulfill pre-specified targets. 

Linking financial performance to sustainability outcomes enables the bonds to enhance issuer accountability and mitigate concerns about greenwashing. Most sustainability-linked bonds include a built-in financial penalty: if the issuer doesn’t meet certain environmental or social goals by a set date, they have to pay higher interest on the bond.

But such financial incentives work only if they are sizable enough to influence the behavior of bond issuers. Unfortunately, evidence indicates that this is not always the case. The average penalty adds less than 12% to the interest rate. 

Our research found that late penalties and the option for issuers to repay bonds early may weaken the impact of sustainability-linked bonds.

The sustainability target dates of many bonds are set close to the end of the bond’s maturity. This means that only a few remaining payments are subject to the financial penalties for noncompliance. Compared to target dates that are farther away from maturity, this reduces the financial consequences of failing to meet sustainability targets.

Private sector participation is crucial to achieving meaningful progress on sustainability challenges.

The problem is compounded by the fact that bonds with higher step-up penalties tend to have later target dates. To improve accountability, sustainability-linked bonds should incorporate multiple interim targets throughout the bond’s life so that financial incentives remain in place throughout.

Many of the bonds also contain call options that allow issuers to minimize or even avoid penalties altogether. Call options allow the issuer to redeem their bonds before sustainability target dates, which can effectively nullify the penalties for failing to meet the targets. 

Sustainability-linked bonds are five times more likely to be callable than conventional corporate bonds. According to our research, 64.9% of sustainability-linked bonds are callable—meaning issuers can redeem them before maturity—compared to corporate green bonds (23.0%) and corporate non-green bonds (12.0%). 

This suggests that issuers of sustainability-linked bonds may be more likely to retain the option of early repayment, which could potentially reduce the effectiveness of these bonds in promoting long-term sustainability commitments.

Moreover, most callable sustainability-linked bonds impose no financial penalty for early redemption even if sustainability targets are unmet, further undermining their credibility.  Applying sizable penalties if bonds are called early can thus significantly strengthen the financial incentives embedded in the bonds.

Setting more timely sustainability target dates and imposing larger penalties for early redemption would significantly strengthen the bonds as credible and effective financial instruments for promoting sustainable outcomes. 

Further, financial regulators should mandate the disclosure of sustainability-linked bonds structural features while external reviewers expand their scope to the financial incentives and sustainability targets.  Strengthening the bonds in this manner will strengthen their intended role of mobilizing capital for sustainable impacts. 

As billions of dollars flow into sustainable investments, investors, regulators, and the public must demand that these tools do more than sound good on paper—they must drive real, measurable progress.

Source: blogs.adb.org