An unsecured bond is a debt security backed only by the issuer’s promise to pay, with no specific property or collateral pledged behind it. In the U.S. corporate market these instruments are called debentures, and they generally pay higher interest than comparable secured bonds because if the issuer fails, you have no asset to seize. U.S. Treasury securities are also technically unsecured, yet they carry virtually no default risk because the federal government’s taxing authority stands behind them.
How an Unsecured Bond Works
When you buy one, you’re lending money to the issuer in exchange for periodic interest payments (the coupon) and the return of your principal on the maturity date. No building, no fleet of trucks, no receivables are tied to the loan. Your assurance is the issuer’s financial strength and its contractual promise to pay.
The contract itself is called an indenture. It sets the coupon rate, the payment schedule, the maturity date, and any special provisions such as call features or protective covenants. For public bond offerings in the United States, the Trust Indenture Act of 1939 requires an independent trustee to oversee the indenture on behalf of bondholders. Before a default the trustee’s role is largely administrative. After a default, the trustee must exercise the same care and skill a prudent person would use in managing their own affairs.1GovInfo. Trust Indenture Act of 1939 That shift from passive administrator to active watchdog is one of the most important legal protections you have as an unsecured bondholder.
The most common issuers are large, financially stable corporations with strong credit ratings and predictable cash flows. Governments issue unsecured debt as well. U.S. Treasury bonds, notes, and bills all fall into this category.
Unsecured vs. Secured Bonds
The difference comes down to collateral. A secured bond is tied to a specific asset or pool of assets. Mortgage bonds are backed by real estate. Equipment trust certificates are backed by physical equipment. If the issuer stops paying, secured bondholders have a legally enforceable right to seize and sell that collateral to recover their investment.
Unsecured bonds have no such backstop. When the issuer is healthy and paying on schedule, holding a secured bond and holding an unsecured bond feel identical. Both deliver regular interest checks and return principal at maturity. The difference becomes real only when the issuer runs into trouble. At that point, the secured bondholder has collateral to fall back on, and you’re in line with the company’s other general creditors, waiting for whatever value remains. That’s why unsecured bonds from the same issuer almost always carry a higher yield than the same issuer’s secured bonds. The extra yield is the market’s price for the added uncertainty.
Where You Stand if the Issuer Defaults
Every company has a capital structure, meaning a pecking order of who gets paid first if the business fails. Where unsecured bonds fall in that order determines how much money you’re likely to recover.
Federal bankruptcy law sets the priority. In a liquidation, the estate is distributed in this sequence:2Office of the Law Revision Counsel. 11 U.S. Code 726 – Distribution of Property of the Estate
- Secured creditors are paid first from the proceeds of their specific collateral. Any shortfall becomes a general unsecured claim.
- Priority unsecured claims jump the line, including administrative costs of the bankruptcy, unpaid employee wages up to a statutory cap, and tax obligations owed to government entities.3Office of the Law Revision Counsel. 11 U.S. Code 507 – Priorities
- General unsecured creditors come next. This is where senior debenture holders land, alongside trade suppliers and other unsecured lenders. Everyone at this level splits whatever is left on a pro-rata basis.
- Subordinated debt holders contractually agreed to be paid only after senior unsecured creditors are made whole. In a severe bankruptcy they often recover very little.
- Equity holders collect last, preferred stockholders and then common. In most corporate bankruptcies common equity is wiped out entirely.
Historical data puts numbers on the risk. S&P Global’s recovery study covering defaults from 1987 through 2025 found that senior unsecured bonds recovered an average of 44.9% of their principal value.4S&P Global. Default, Transition, and Recovery: US Recovery Study That’s a long-term average, and individual cases vary widely. Subordinated debt fares considerably worse, and in many distressed situations those holders walk away with nothing.
Protective Covenants in the Indenture
The absence of collateral doesn’t leave you without protection. Bond indentures typically include restrictive covenants meant to prevent the issuer from taking actions that increase your risk after you’ve bought in.
One of the most important is the negative pledge clause, which prohibits the issuer from pledging its assets as collateral for other creditors. Without it, an issuer could take on new secured debt after you purchased your debenture and push you further down the priority ladder. The negative pledge keeps you from being subordinated after the fact.
Other common covenants restrict how much additional debt the issuer can take on, limit dividend payments to shareholders while bonds are outstanding, and require the issuer to maintain certain financial ratios. A covenant violation triggers a default under the indenture, and the threat of triggering that default gives bondholders meaningful leverage even when a company hasn’t missed a payment.
Credit Ratings and Yield Spreads
Because you have no collateral to fall back on, the issuer’s credit quality drives everything. Independent rating agencies assess the likelihood of default, and their letter grades are the shorthand the bond market uses to price risk.
S&P and Fitch use a scale from AAA (lowest default risk) down to D (already in default). Anything rated BBB- or above is investment grade. Below that threshold the bond is speculative grade, commonly called a “junk bond.”5S&P Global. Understanding Credit Ratings Moody’s uses a parallel scale on which Baa3 is the lowest investment-grade rating; Ba1 or below is speculative.6Moody’s. Moody’s Rating Scale and Definitions
The practical impact shows up in the yield spread, the gap between what a corporate bond pays and what a Treasury of the same maturity pays. Since Treasuries are considered essentially risk-free, that spread is the compensation you’re demanding for the issuer’s credit risk and the bond’s lower liquidity. A tight spread means the market is confident. A wide spread means real concern. A credit downgrade pushes the bond’s price down and its yield up, widening the spread. An upgrade does the opposite. If you’re evaluating an unsecured bond, the yield spread relative to Treasuries is the single most important number on the screen.
Interest Rate Risk
Default risk gets most of the attention, but interest rate risk can hit your portfolio value just as hard. When market interest rates rise, existing bond prices fall. When rates drop, prices climb.7SEC. Investor Bulletin: Interest Rate Risk
The logic is simple. If you hold a bond paying 4% and new bonds start paying 5%, nobody will pay full price for your 4% bond. Its market price drops until its effective yield matches what buyers can get elsewhere. It works in reverse too. If new bonds offer only 3%, your 4% bond becomes more valuable.
Maturity length amplifies the effect. A 2-year bond barely moves when rates shift because you’ll get your principal back soon anyway. A 20-year bond can swing dramatically because buyers are locked into that below-market rate for a long time.7SEC. Investor Bulletin: Interest Rate Risk This surprises many new bond investors. They buy a highly rated debenture assuming it’s “safe,” then watch its market value drop 10% after a rate hike even though the issuer is perfectly healthy. Hold to maturity without a default and you’ll still get your full principal back. Sell early in a rising-rate environment and you’ll take a loss.
Callable Bonds and Reinvestment Risk
Many corporate debentures include a call provision that lets the issuer redeem the bond before its stated maturity. Issuers tend to exercise this option when interest rates fall, since they can pay off the old bonds and refinance more cheaply. That works to your disadvantage.
The problem is reinvestment risk. When your bond gets called in a falling-rate environment, you get your principal back earlier than expected and the only new bonds available pay less than what you were earning. The higher yield you originally bought for effectively disappears.
Callable bonds usually offer a slightly higher coupon than comparable noncallable bonds to compensate. They also come with a call protection period, often at least a few months after issuance, during which the issuer can’t exercise the call. When evaluating a callable debenture, look at the yield-to-worst rather than the yield-to-maturity. Yield-to-worst is the lower of the yield-to-call and the yield-to-maturity, and it’s the most conservative estimate of what you’ll actually earn.
How the Interest Is Taxed
Interest from a corporate unsecured bond is taxed as ordinary income at your federal marginal rate. The IRS treats it the same as bank account interest or CD interest.8Internal Revenue Service. Topic No. 403, Interest Received For 2026, federal marginal rates range from 10% to 37% depending on your taxable income.9Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Most states tax this interest as well.
If you sell before maturity at a price above what you paid, the profit is a capital gain. Bonds held longer than one year qualify for long-term capital gains rates. Bonds held a year or less are taxed at short-term rates that match your ordinary income bracket. Selling at a loss generates a capital loss that can offset other gains.
One important distinction: interest on U.S. Treasury bonds is exempt from state and local income taxes, though still subject to federal tax. That state-tax exemption can make Treasuries more attractive than corporate debentures on an after-tax basis, especially if you live in a high-tax state. Run the after-tax numbers before assuming a corporate bond’s higher coupon puts more money in your pocket.
Trading in the Secondary Market
Unlike stocks, most bonds don’t trade on a centralized exchange. Corporate debentures trade over the counter through broker-dealers, so the prices you see can vary between firms. FINRA’s TRACE system reports real-time trade data for corporate and agency bonds, and you can look up any bond by its CUSIP number to see recent trade prices and volumes.10FINRA. Fixed Income Data Checking TRACE before you buy or sell is worth the two minutes it takes.
Liquidity varies enormously across the unsecured bond market. Treasuries trade in massive volumes with razor-thin bid-ask spreads. High-grade corporate debentures from large issuers are reasonably liquid. Lower-rated bonds, smaller issuances, and older bonds approaching maturity can trade infrequently, with wide spreads that effectively raise your cost of buying and lower your proceeds from selling. If you might need to sell before maturity, treat liquidity as part of the evaluation, not an afterthought. A great yield on a bond you can’t sell at a fair price isn’t actually a great yield.