Perpetual Bonds Explained

Every bond investor learns the same basic promise early: lend money now, get it back at maturity, with interest paid along the way. Perpetual bonds break that promise deliberately — there is no maturity date at all. The issuer pays interest indefinitely, and the instrument's debt-like coupon combined with its equity-like absence of a repayment date makes it one of the more unusual corners of the fixed income market.

What Is a Perpetual Bond?

A perpetual bond (also called a "perp" or consol, after the UK's historic consolidated annuities) is a debt instrument with no fixed maturity date — the issuer pays a coupon to bondholders indefinitely and is never contractually obligated to repay the principal. This sits in genuinely hybrid territory between conventional debt and equity: like debt, it pays a defined coupon that ranks ahead of dividends and is typically fixed or tied to a reference rate; like equity, there's no repayment date, meaning the holder's return depends entirely on the ongoing coupon stream and whatever price the bond can be sold for in the secondary market, since there's no guaranteed return of principal to anchor its value the way a dated bond's maturity does.

Why Would an Issuer Sell a Bond It Never Has to Repay?

For issuers, perpetual bonds offer a way to raise capital that behaves more like equity on the balance sheet — in many regulatory and accounting frameworks, a perpetual instrument with sufficiently loss-absorbing features can be treated as capital rather than debt, which matters enormously for banks and insurers subject to regulatory capital requirements. This is precisely why Additional Tier 1 (AT1) bank capital instruments are structured as perpetual bonds: banks need instruments that count toward regulatory capital ratios, and perpetuity (combined with other loss-absorption features like coupon cancellation and write-down or conversion triggers) is central to qualifying as capital rather than ordinary debt under Basel-style capital rules.

Corporates outside the banking and insurance sectors also issue perpetual bonds occasionally, typically to raise capital that rating agencies and lenders will treat partially as equity-like for leverage calculation purposes, improving reported credit metrics relative to issuing the same amount as conventional dated debt.

The Call Feature: How Perpetuity Actually Works in Practice

Almost all perpetual bonds in practice include a call option, giving the issuer (not the investor) the right to redeem the bond at a specified price on or after a set date, often five or ten years after issuance, and then at regular intervals afterward. Market convention has developed around the expectation that issuers will call a perpetual bond at the first available opportunity, both to maintain good standing with investors and because the coupon often steps up (resets to a less issuer-friendly rate) if the bond isn't called, creating a strong economic incentive to redeem. Investors price these instruments largely around the expected call date rather than true perpetuity, even though the issuer retains full legal discretion not to call — a discretion that becomes very real and very consequential during periods of market stress, when an issuer facing elevated refinancing costs may rationally choose to skip a call and leave the bond outstanding.

Risks Specific to Perpetual Bonds

Extension risk — the possibility an issuer skips an expected call date — is the risk most specific to this asset class, and it can cause sharp price declines for investors who had priced the bond assuming redemption at the first call date. Coupon deferral or cancellation risk is also significant for loss-absorbing instruments like AT1s, where the issuer can suspend coupon payments entirely under specific regulatory or financial stress conditions without triggering a default, unlike a missed coupon on conventional debt. And because perpetual bonds have no maturity to anchor their price, they tend to be more sensitive to changes in interest rates and credit spreads than a comparable dated bond, similar in some respects to how a convertible bond's equity-linked features make it behave differently from a plain vanilla bond.

Accounting Classification: Debt or Equity?

Whether a perpetual bond is classified as a financial liability or as equity on the issuer's balance sheet under IFRS and US GAAP depends on the instrument's specific contractual terms, not simply its label. The key test under IFRS is whether the issuer has an unconditional right to avoid delivering cash or another financial asset to settle the instrument — a perpetual bond where coupon payments can genuinely be deferred or cancelled at the issuer's discretion, with no contractual obligation ever crystallising into a cash payment requirement, can qualify for equity classification, while one with coupons the issuer is contractually obligated to pay (even if principal is never repaid) is typically classified as a liability. This classification has significant consequences for an issuer's reported leverage ratios, which is part of why the precise legal drafting of a perpetual instrument's coupon and loss-absorption terms is scrutinised so closely by rating agencies, auditors, and regulators alike.

FAQ

Do perpetual bonds ever get repaid?
Only if the issuer exercises a call option, which is common market practice at the first available call date but is never contractually guaranteed.

Are perpetual bonds riskier than conventional bonds from the same issuer?
Generally yes — the combination of extension risk, potential coupon deferral, and greater interest rate sensitivity typically make perpetual bonds more volatile and riskier than a dated bond from the same issuer.

Why are perpetual bonds common among banks specifically?
Their loss-absorbing, equity-like features let them qualify as regulatory capital under frameworks like Basel III, which conventional dated debt cannot do.

Fixed income instruments and capital structure are core topics across Learnsignal's CPD course content for finance professionals.