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Subordinated Bonds and Perpetual Bonds (Including CoCo Bonds), Explained

These securities pay higher yields than plain corporate bonds precisely because they carry extra layers of risk β€” here is what that risk actually looks like.

What a subordinated bond is

If the issuer goes bankrupt, holders of subordinated debt get repaid after ordinary (senior) bondholders but before shareholders. Companies and financial institutions issue it to raise capital, and because that lower repayment priority is a real risk, subordinated bonds typically carry a higher coupon than senior bonds from the same issuer β€” sitting in a middle ground of risk between bonds and stock.

What a perpetual bond (hybrid capital security) is

A perpetual, or hybrid capital, security has no fixed maturity date β€” or an extremely long one β€” and under certain accounting and regulatory frameworks can be classified as equity rather than debt on the balance sheet. Banks and insurers, which must meet capital adequacy requirements, often favor these instruments because they raise capital without diluting existing shareholders the way issuing new stock would.

The call option (early redemption) structure

In practice, these bonds are often structured with a long stated maturity β€” say, 30 years β€” paired with a call option letting the issuer redeem it early starting at a set point, commonly around the five-year mark. Investors conventionally expect the issuer to call the bond at that first opportunity and treat it as an effective maturity date. Many issues also include a step-up clause that raises the coupon rate if the issuer skips the call, which acts as an incentive for the issuer to redeem on schedule.

What a CoCo bond (contingent convertible bond) is

A CoCo bond behaves like an ordinary bond in normal times, paying regular interest, but it's specifically designed so that if the issuer's capital ratio falls below a pre-set trigger level, it automatically converts into equity or has its principal written down, regardless of what the investor wants. Because of this loss-absorption feature, CoCo bonds are typically classified as higher-risk than an ordinary subordinated bond, despite offering a higher coupon.

Extension risk: when the expected call doesn't happen

There have been real cases where an issuer facing tight financing conditions chose to skip an expected call date, unsettling bond markets before the issuer ultimately reversed course and redeemed the bond anyway. Episodes like this illustrate that even a bond the market conventionally expects to be called on schedule can end up with its effective maturity extended far longer than investors planned for, purely at the issuer's discretion.

What to check before investing

Subordinated bonds, perpetual securities, and CoCo bonds can look attractive purely because of their higher coupon, but that higher yield comes with correspondingly higher risk β€” lower repayment priority or the chance of an unexpected loss. Before investing, review the issuer's credit rating and financial health, the terms and timing of any call option and step-up clause, and, for CoCo bonds specifically, the exact conversion or write-down trigger conditions, using the official offering documents rather than a summary.

Why these securities pay more than an ordinary bond

The extra yield on subordinated debt, perpetual securities, and CoCo bonds isn't free money β€” it's compensation for taking on risks an ordinary senior bondholder doesn't carry: a lower place in line if the issuer fails, an uncertain effective maturity, or, in the case of CoCo bonds, the possibility of an automatic conversion or write-down. Understanding exactly which of these risks applies to a specific security is the difference between an informed yield-seeking decision and an unpleasant surprise.

This is general information, not investment advice

This page explains the general structure of these instruments for educational purposes. Actual terms β€” coupon rates, call dates, step-up provisions, and trigger conditions β€” vary by issuer and by specific bond, and regulatory treatment differs by country. Read the official prospectus or offering circular for any bond you're considering, and consult a licensed financial advisor if you're unsure how a specific issue fits your risk tolerance.

Frequently Asked Questions

If an issuer doesn't exercise its call option, does that mean it's in financial trouble?

Not necessarily β€” it can reflect a strategic decision or unfavorable refinancing conditions rather than distress, but skipping an expected call is generally viewed negatively by the market and can affect the issuer's future borrowing costs, which is exactly why most issuers try hard to call on the expected date.

Is a CoCo bond riskier than a plain subordinated bond?

Generally yes β€” a CoCo bond carries the added risk of automatic conversion to equity or principal write-down if the issuer's capital ratio breaches a trigger, on top of the subordination risk that ordinary subordinated bonds already carry, which is why they typically offer a still-higher coupon to compensate.