Secured vs Unsecured Bonds
Secured vs Unsecured Bonds
Secured bonds pledge specific assets (equipment, real estate, cash flow) as collateral. If the issuer defaults, secured bondholders can seize and liquidate those assets. Unsecured bondholders have no such claim and must line up behind all secured creditors in bankruptcy.
Key takeaways
- Secured bonds recover 60–90% in default because they can claim pledged assets directly
- Unsecured bonds recover 30–60%, dependent on general asset availability
- Collateral types include equipment, real estate, accounts receivable, and cash flow from specific projects
- Secured bonds yield 50–200 basis points less than equivalent unsecured bonds, reflecting lower default loss
- For individual investors, most corporate bond exposure comes via unsecured bonds in ETFs and funds
Why collateral matters in recovery
When a company defaults, its assets don't evaporate—they are distributed according to bankruptcy rules. Secured creditors have a lien on specific assets, giving them first claim.
Example: A railroad company issues $100M of secured bonds backed by its locomotives and track. The company fails. In bankruptcy:
- Secured bondholders can repossess and auction the locomotives and track, recovering $70M (70% of their claims, before other creditors take anything)
- Unsecured bondholders share in whatever is left (general receivables, real estate not pledged, etc.)—maybe $30M for $50M of claims (60% recovery)
The secured creditor's recovery (70%) exceeds the unsecured creditor's recovery (60%) because the secured creditor's collateral pool was segregated and protected.
Types of collateral
Corporate bonds can be secured by:
- Equipment and property (utilities, railroads, airlines): Tangible assets with identifiable resale value. A utility bond is often secured by transmission lines and generating stations. An airline bond might be secured by aircraft. In a Chapter 7 liquidation, these assets can be sold to third-party operators
- Real estate (REITs, office companies): Land, buildings, and leases pledged to secure the bond. If the REIT fails, secured bondholders can foreclose and sell the properties
- Project cash flow (infrastructure, energy): A bond financing a toll road is secured by the road's future toll revenues. A bond financing a power plant is secured by power-purchase agreements and the plant itself
- Accounts receivable (asset-backed securities, securitizations): A bond backed by auto loans or mortgages is secured by the underlying loans. Cash flows from borrowers service the bond
- Inventory or receivables (trade credit securitizations): A company securitizes its receivables (money owed by customers) to finance working capital
- General plant and equipment (floating lien): A broad lien covering all assets currently owned and acquired in the future (common in bank loans; less common in bonds)
Real estate is the most liquid and predictable collateral. Equipment is moderately liquid. Project cash flows are illiquid but stable if the project is contracted (e.g., a toll road with government guarantees). Financial assets (receivables) are liquid if the underlying borrowers are creditworthy.
Valuation: Why secured bonds yield less
If a secured bond has 80% recovery probability and an unsecured bond has 50% recovery probability, the secured bond's expected loss from default is lower. This shows up immediately in pricing.
Suppose both bonds have a 3% annual default probability. Expected loss is:
- Secured: 3% default probability × 20% loss rate = 0.6% annual expected loss
- Unsecured: 3% default probability × 50% loss rate = 1.5% annual expected loss
Investors will demand roughly 90 basis points more yield on the unsecured bond to compensate. In 2024, this gap is typically 75–150 basis points for high-quality issuers, wider for weak credits.
Examples of secured corporate bonds
- Utility bonds: Southern Company, NextEra Energy, and other utilities issue secured bonds backed by generation and transmission assets. These trade at tight spreads because the underlying assets are real, tangible, and earning stable cash flows
- REIT bonds: Prologis, Welltower, and other REITs issue secured bonds backed by their properties. Even in distress, properties can be foreclosed and sold
- Transportation: Railroad companies (Union Pacific, CSX) and airline equipment trusts issue secured bonds backed by rolling stock and aircraft. These are actively traded in credit markets
- Infrastructure project finance: Toll roads, power plants, and water systems financed via secured bonds. The collateral is the revenue stream from the project; if the project fails to generate revenue, bondholders can take control
- Asset-backed securities (ABS): Securitizations of auto loans, mortgages, and credit card receivables are backed by the underlying loan pools. MBS and auto ABS have been major markets since the 2000s
Unsecured bonds: The majority of corporate debt
Most corporate bonds are unsecured. A company like Microsoft or Google issues unsecured bonds; its strong credit means it can borrow without pledging collateral. Unsecured bonds have advantages:
- Flexibility: The company retains asset control for operations, maintenance, and potential sale
- Lower issuance cost: Once a company's credit is strong enough, unsecured bonds are cheaper than secured bonds because the cost of pledging assets and creating liens is avoided
- Simplicity: Secured bonds require asset appraisals, lien filings, and ongoing monitoring; unsecured bonds require only a credit covenant
Unsecured bonds rely entirely on the issuer's ability to generate cash flow. A company with stable, growing earnings can service unsecured debt indefinitely; a company with declining earnings or high leverage cannot.
For investors, unsecured bonds in diversified funds (like LQD or AGG) provide reasonable recovery expectations. A fund holding 500+ issuers is well-insulated from individual defaults. But concentration in unsecured bonds of a single company is riskier than an equivalent holding of secured bonds.
Secured vs unsecured in a downturn
During a credit squeeze or recession:
- Secured bonds: Hold value better because collateral is tangible. A transportation secured bond might trade at 95 cents on the dollar even if the underlying company is struggling, because the collateral (aircraft, track) has intrinsic value
- Unsecured bonds: Trade down more sharply because recovery depends solely on the issuer's ability to service debt. An unsecured bond from the same company might trade at 75 cents as investors price in lower recovery
This was visible in the 2008 crisis. Real estate-backed secured bonds (even from troubled lenders) held value better than unsecured bonds from companies with weak earnings. In 2020, during the COVID panic, unsecured high-yield bonds from airlines and retailers fell 30–50%; secured bonds from the same companies fell 15–25%.
Decision tree: Secured or unsecured?
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Secured and unsecured distinctions are defined in detail in the bond indenture—the legal contract that governs all terms, protections, and restrictions. The indenture also specifies covenants that constrain the issuer's actions to protect bondholders.