TLDR:
A debenture is a type of long-term debt instrument issued by corporations or governments that is backed only by the creditworthiness and reputation of the issuer, not by physical assets.
Debentures vs. Secured Bonds
The key distinction between a debenture and a secured bond is the presence or absence of specific collateral. A secured bond is backed by specific assets (real estate, equipment, receivables) that the bondholder can claim in default. A debenture relies entirely on the issuer’s creditworthiness — making it inherently riskier for investors but less restrictive for issuers who don’t want to pledge specific assets.
Relevance for Startups
While mature companies routinely issue debentures to raise debt capital, early-stage startups typically cannot access debenture markets because they lack the credit history and investor recognition needed.
Debenture vs. Bond
The terms “debenture” and “bond” are often used interchangeably but have technical differences depending on jurisdiction. In the US, “debenture” typically refers to unsecured corporate debt while “bond” can include secured instruments. In the UK and other Commonwealth jurisdictions, “debenture” has a broader meaning encompassing any acknowledgment of corporate debt and may be secured by a floating charge over the company’s assets. Turkish company law uses “tahvil” (bond) and “tahvilat” (debenture-style) interchangeably for medium- and long-term corporate debt.
Convertible Debentures
A convertible debenture combines fixed-income features (interest payments, principal repayment) with an embedded conversion option allowing the holder to convert the debenture into equity at a predetermined ratio. Convertible debentures are popular in mid-stage and growth-stage financings where investors want downside protection (debt repayment) plus equity-like upside. Pricing and modeling convertible debentures requires sophisticated valuation incorporating credit spreads, equity volatility, and conversion terms.