Debenture vs. Bond: What Investors Need to Know

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A debenture is a type of bond, so the real comparison is between debentures and secured bonds. “Bond” is the broad term for any debt security that pays interest and returns principal at maturity. A debenture is a bond with no specific collateral behind it: holders rely only on the issuer’s creditworthiness and general ability to pay. A secured bond is backed by pledged assets that bondholders can claim if the issuer defaults. Every debenture is a bond, but not every bond is a debenture.

What a bond is

A bond is an IOU. An investor lends money to a corporation, government, agency or municipality, and the issuer promises to repay the principal on a stated maturity date, usually with periodic interest (coupon) payments along the way.

A bond’s legal terms sit in a contract called the indenture. The indenture states the coupon, maturity, call features and whether the debt is secured. Secured bonds name the collateral. Examples include mortgage bonds backed by real estate and equipment trust certificates backed by aircraft or rail cars. Each bond issue carries its own credit rating, including issues from government agencies and municipalities. Highly rated issues carry little perceived default risk.

What a debenture is

A debenture is backed by the “full faith and credit” of the issuer rather than by physical assets. Corporations often use debentures for long-term financing, typically to fund a planned project or a business expansion, and expect to repay from the cash that project generates.

Key features of debentures:

• Coupon: fixed or floating, with a stated repayment date.
• Payment order: interest on debentures is a contractual obligation. It must be paid before the company distributes dividends to shareholders.
• Repayment of principal: either a lump sum at maturity or installments over the life of the issue. Some issuers set money aside each year through a sinking fund or redemption reserve, as required by the terms or by local law. The documentation spells out which method applies.
• Ranking: senior debentures rank ahead of subordinated debentures in a liquidation. Both rank behind secured creditors to the extent of their collateral, and ahead of shareholders.
• Convertibility: convertible debentures can be exchanged for a set number of the company’s shares. Non-convertible debentures cannot.

Investors who want the equity upside of a convertible generally accept a somewhat lower interest rate in exchange.

Important: Converting debentures into stock increases the share count. That dilutes per-share metrics such as earnings per share (EPS) for existing shareholders. When you value a company’s stock, count the shares that conversion could add.

Debenture vs. bond: where the differences matter

Collateral and recovery. This is the core difference. If an issuer defaults, secured bondholders can claim the pledged assets or the proceeds from selling them. Debenture holders become general unsecured creditors. They share whatever is left after secured claims are satisfied, in the order their ranking allows.

Yield. Since debenture holders give up a claim on collateral, a company’s debentures usually need to offer a higher yield than its secured bonds to attract buyers. Convertibility can offset part of that, as noted above.

What drives the risk. With a secured bond, part of the analysis is about the collateral: what it is worth and how easily it can be sold. With a debenture, the analysis rests almost entirely on the issuer: its earnings, cash flow, existing debt and credit rating. Tools from fundamental analysis, such as interest coverage and leverage ratios, do most of the work.

What does not change. Both are fixed-income securities. Their market prices move inversely with interest rates, a relationship explained in why bond prices fall when interest rates rise. Both can carry call features. Both can be structured as term bonds (one maturity date) or serial bonds (portions maturing on a schedule). The serial-versus-term choice concerns repayment timing and is separate from whether the debt is secured. An issuer can sell either structure as secured debt or as debentures.

Example of debenture and bond

Consider a hypothetical company that issues $10 million of first-mortgage bonds secured by its factory. It also issues $10 million of senior debentures. Two years later it goes bankrupt, and the factory sells for $8 million. Assume no other assets are recovered beyond $3 million of unencumbered cash.

• The mortgage bondholders receive the $8 million from the factory sale. Their remaining $2 million claim becomes unsecured.
• The $3 million in cash is shared among all unsecured claims: the $2 million shortfall plus the $10 million of debentures. That is $12 million of claims, so each receives about 25 cents on the dollar.
• Mortgage bondholders recover about $8.5 million of $10 million. Debenture holders recover about $2.5 million.

Same issuer, same default. Recovery depends on the security behind each claim. Real bankruptcy outcomes also depend on court proceedings, other creditors and how the indentures are drafted.

When the general rule does not hold

Strong unsecured issuers. The lack of collateral does not make every debenture riskier than every bond. U.S. Treasury bonds and bills are unsecured, so they are debentures in the strict sense. They are regarded as risk-free in default terms because the U.S. government backs them. Likewise, a debenture from a highly rated company can carry less default risk than a secured bond from a weak one. The comparison “debentures are riskier” holds within the same issuer’s capital structure. It does not hold across all issuers.

U.K. and other usage. In British and some Commonwealth markets, a debenture can be a secured instrument. It is often a document giving a lender a fixed or floating charge over a company’s assets. For a U.K. instrument labeled a debenture, read the terms to find out whether it is secured.

Weak collateral. A secured bond is only as protective as its collateral. Specialized equipment or assets that lose value in a downturn may fetch far less than their book value.

The Bottom Line

Investors comparing a company's debt choose between collateral protection and a usually higher yield. Within one issuer, secured bonds generally recover more in a default, while debentures depend on the issuer's earnings, cash flow and credit rating. Across issuers the rule breaks down, since Treasuries are unsecured and weak collateral protects little, so read the indenture and judge the issuer before buying either.