A financial instrument containing a promise by the issuer, normally a company, to pay the holder of the instrument a specified amount on or by a specified date (usually referred to as the maturity date).

Debt securities can take several forms, including bonds, debentures, notes and other instruments evidencing a debt owing by the issuer to the holder that is negotiable or transferable and that is not a convertible security.

For the purposes of the ASX Listing Rules, a debt security also includes any security that the Australian Securities Exchange (ASX) decides to classify as a debt security, but does not include a security that the ASX decides to classify as an equity security.

(ASX Listing Rule 19.12.)