The characteristics of bonds are the built-in features that determine what an investor earns, when they get paid, and how much risk they carry. Three sit at the foundation: par value, coupon rate, and maturity date. Around those cluster the features that separate one bond from another, including the coupon structure, credit quality, issuer type, any embedded options like a call provision, and how the interest is taxed. These features interact with each other and with market conditions to drive a bond’s price, yield, and behavior in a portfolio.
Par Value, Coupon Rate, and Maturity Date
Par value is the principal amount the issuer promises to repay at maturity. In the U.S. market, the most common par value is $1,000, though some bonds use $100 increments.1Legal Information Institute. Par Value Par matters beyond the repayment amount because it is the base figure used to calculate interest payments.
The coupon rate is the annual interest rate the issuer pays, expressed as a percentage of par value. A $1,000 bond with a 5% coupon generates $50 per year, typically split into two semiannual payments of $25. The rate is locked in at issuance and does not change over the bond’s life, which is why bonds are called fixed-income securities. That fixed payment is distinct from the bond’s yield, which shifts daily based on market price.
The maturity date is when the issuer must repay the full par value. Bonds are loosely grouped by how far out that date falls: short-term maturities run roughly one to five years, intermediate five to ten, and long-term beyond ten. Longer maturities generally come with higher coupon rates to compensate for locking up money longer. Treasury bills mature in one year or less, while Treasury bonds can extend to 30 years.2TreasuryDirect. Treasury Bills
How the Coupon Is Structured
Not every bond pays interest the same way. The coupon structure is one of the most consequential characteristics because it dictates both cash flow predictability and how the bond’s price behaves when market rates move.
Fixed-Rate Bonds
Most bonds are fixed-rate. The coupon is set at issuance and stays the same until maturity. Cash flow is completely predictable. The drawback is that when market rates rise, the fixed payment looks less attractive next to new issues, and the bond’s market price falls.
Floating-Rate Bonds
A floating-rate bond’s coupon resets periodically based on a benchmark rate plus a fixed spread. If the benchmark is a three-month Treasury bill rate of 2% and the spread is 0.40%, the coupon would be 2.40%. When the benchmark moves, the next payment adjusts. Because the coupon tracks market rates, floaters experience much less price fluctuation than fixed-rate bonds of comparable maturity. The trade-off is a lower starting coupon. Some floaters include a cap that limits how high the coupon can go or a floor that sets a minimum.
Zero-Coupon Bonds
Zero-coupon bonds pay no interest during their life. They sell at a steep discount to par, and the entire return comes from the difference between purchase price and the par value received at maturity.3Investor.gov. Zero Coupon Bond A $1,000 par zero maturing in 20 years might sell for $450.
The catch is taxes. Even without receiving cash, the IRS requires the annual increase in value to be reported as income each year, often called phantom interest. The tax code treats the yearly accretion of original issue discount as gross income, and cost basis rises by the same amount.4Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount For this reason, zeros work best inside tax-advantaged accounts. Their prices also swing more sharply than coupon-paying bonds when rates change, because there are no periodic payments to cushion the impact.3Investor.gov. Zero Coupon Bond
Embedded Options: Callable and Putable Bonds
Some bonds carry embedded options that let either the issuer or the investor act before maturity. These features materially change the bond’s risk profile.
A callable bond lets the issuer buy the bond back early, usually after an initial call protection period. Many municipal bonds become callable ten years after issuance.5FINRA. Callable Bonds: Be Aware That Your Issuer May Come Calling Issuers exercise the right when rates have fallen since issuance, refinancing at a lower rate. For the investor, the bond gets pulled away exactly when holding it would be most profitable. The issuer sometimes pays a small call premium above par, but the investor still faces reinvesting cash at lower prevailing rates.
A putable bond is the mirror image. It gives the bondholder the right to sell the bond back to the issuer at par before maturity. That protects the investor when rates rise, since they can cash out at par and reinvest at higher rates. Putable bonds yield less than comparable bonds without the feature, since the downside protection is built into the price.
Secured Versus Unsecured
Whether a bond is backed by specific assets affects what happens if the issuer defaults. A secured bond is backed by collateral, such as real estate, equipment, or receivables. If the issuer fails to pay, bondholders can claim and sell those assets to recover their investment. An unsecured bond, often called a debenture, is backed only by the issuer’s general creditworthiness. In a default, holders of unsecured bonds stand behind secured creditors and may recover significantly less of their principal.
The distinction shows up in the coupon. Secured bonds can offer lower rates because the collateral reduces investor risk. Unsecured bonds must pay more to attract buyers willing to accept the weaker claim.
Issuer Type and Credit Rating
Who issues the bond shapes its risk and its tax treatment as much as any other characteristic. A credit rating is an independent assessment of the issuer’s ability to make interest payments and return principal on time. The major rating agencies use letter grades that split the bond universe into two broad camps. Investment-grade bonds, rated BBB- and above on the S&P scale, represent issuers with relatively low default risk. Speculative-grade bonds, rated BB+ and below, carry higher default risk and are sometimes called junk bonds. S&P’s historical data shows a three-year cumulative default rate of about 0.91% for BBB-rated companies, rising to 4.17% for BB and 12.41% for B.6S&P Global. Understanding Credit Ratings Speculative-grade issuers offset the risk with higher coupon rates, which is where the high-yield label comes from.
The main issuer categories each behave differently:
- U.S. Treasury securities carry the lowest credit risk of any bond because they are backed by the full faith and credit of the federal government. They come as Treasury bills (one year or less), Treasury notes (two to ten years), and Treasury bonds (twenty to thirty years).7TreasuryDirect. About Treasury Marketable Securities
- Municipal bonds are issued by state and local governments to fund public projects. Interest is generally excluded from federal income tax, and often from state and local taxes if you live in the issuing state. That tax advantage means municipals can offer lower coupons and still deliver competitive after-tax returns.8Municipal Securities Rulemaking Board. Municipal Bond Basics
- Corporate bonds are issued by companies to fund operations, acquisitions, or capital spending. Corporate debt carries higher credit risk than government-backed bonds, and the interest is fully taxable as ordinary income. Higher risk plus full taxability generally means the highest coupon rates of the three main issuer types.9Internal Revenue Service. Topic No. 403, Interest Received
- Agency bonds are issued by government-sponsored enterprises like Fannie Mae and Freddie Mac. These are not backed by the full faith and credit of the U.S. government and carry slightly more credit risk than Treasuries. Ginnie Mae is an exception and does carry full government backing.
Yield and the Price-Yield Relationship
The coupon rate says what the bond pays relative to par. Yield says what you actually earn relative to the price you paid. Because bonds trade in a secondary market where prices fluctuate constantly, yield is the more useful figure for comparing options.
Current yield is the simplest measure: divide the annual interest payment by the current market price. A bond paying $50 per year and trading at $950 has a current yield of 5.26%. Useful, but incomplete. It ignores the extra $50 in principal above the purchase price you collect at maturity.
Yield to maturity (YTM) is the more complete measure. It calculates the total annualized return you would earn buying at today’s price and holding to maturity, assuming coupon payments are reinvested at the same rate. YTM factors in the coupons, the current price, and any capital gain or loss at maturity. When a bond trades below par (at a discount), YTM is higher than the coupon rate. When it trades above par (at a premium), YTM falls below the coupon rate.
Real yield subtracts inflation from the nominal yield. A bond yielding 5% in a 3% inflation environment delivers about 2% in real purchasing power. When inflation exceeds the nominal yield, real yield turns negative. Treasury Inflation-Protected Securities (TIPS) address this by adjusting principal in step with the Consumer Price Index, so the coupon payment rises with inflation and the original principal is guaranteed at maturity.
The connection between price and yield is the single most important market dynamic. They move in opposite directions, and this follows directly from the fixed nature of the coupon. When market rates rise, new bonds offer higher coupons, and an existing bond with a lower coupon becomes less attractive. Its price drops until its effective yield matches the going rate. If new bonds pay 6%, no one will pay full price for a 4% bond; the price has to fall far enough that the buyer earns a competitive total return, including the capital gain from buying below par.10Federal Reserve Bank of St. Louis. Why Do Bond Prices and Interest Rates Move in Opposite Directions The reverse happens when rates fall: an older bond with a higher coupon becomes valuable, and investors bid the price above par.
Duration and Price Sensitivity
Not all bonds react equally to rate changes. Duration measures how sensitive a bond’s price is to a shift in rates. Expressed in years, it gives a rough estimate: for every 1% change in interest rates, a bond’s price moves roughly 1% in the opposite direction for each year of duration. A bond with a duration of five years would lose about 5% of its value if rates rose by 1%, and gain about 5% if rates fell by 1%.
Several features push duration up or down. Longer maturities increase it. Higher coupon rates decrease it, because more cash flow arrives sooner. Zero-coupon bonds carry the highest duration for their maturity because the entire return is concentrated at the end. Duration assumes a straight-line relationship between price and yield, which works for small movements; convexity captures the curvature that matters for large ones. The practical takeaway: if rates look likely to rise, shorter-duration bonds lose less value, and if rates look likely to fall, longer-duration bonds deliver bigger gains.
The Risks Built Into a Bond’s Features
Bonds are often considered safer than stocks, and in many scenarios they are. Safer does not mean risk-free. Each of the characteristics above brings a matching risk.
- Interest rate risk is the risk that rising rates will push a bond’s market price down. It is the dominant risk for high-quality bonds and hits long-duration bonds hardest. Holding to maturity returns par regardless of price swings along the way, but you give up the chance to earn higher rates elsewhere.
- Inflation risk is the erosion of a fixed coupon’s purchasing power. A 4% coupon looks solid until inflation runs at 5%. Longer-term bonds suffer most because the erosion compounds across many years of payments.
- Credit risk is the chance the issuer defaults on interest or principal. Ratings provide a starting point, but they can change. A downgrade from investment grade to speculative grade can trigger a sharp price drop even without an actual default.
- Call and reinvestment risk applies to callable bonds. When rates fall, the issuer redeems the bond and refinances cheaply, forcing the investor to reinvest at lower rates.
- Liquidity risk is the difficulty of selling quickly at a fair price. Thinly traded bonds carry wide bid-ask spreads. Treasuries are highly liquid; small corporate issues or obscure municipal bonds often are not.
These risks do not sit in isolation. A lower-rated corporate bond with a long maturity and a call provision stacks interest rate risk, credit risk, and call risk together. Knowing which risks apply to a particular bond is half the work of analyzing it.
How Bond Income Is Taxed
Tax treatment is itself a characteristic of the bond, and it varies by issuer.
Interest from corporate bonds is taxed as ordinary income at the federal level and generally at the state level as well.9Internal Revenue Service. Topic No. 403, Interest Received Treasury interest is federally taxable but exempt from state and local income tax. Municipal bond interest is generally exempt from federal income tax, and if you live in the state that issued the bond, it may be exempt from state and local taxes too.8Municipal Securities Rulemaking Board. Municipal Bond Basics Out-of-state municipal interest is still federally tax-free but usually subject to your state’s income tax.11Internal Revenue Service. Publication 4079 – Tax-Exempt Governmental Bonds
Selling a bond before maturity for more than you paid produces a capital gain. Bonds held more than a year qualify for long-term capital gains rates of 0%, 15%, or 20%, depending on income. Short-term gains are taxed as ordinary income. Zero-coupon bonds add the phantom-income wrinkle: a portion of the original issue discount must be reported as income each year even though no cash arrives until maturity.4Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount Cost basis rises by the reported amount, so the eventual taxable gain at maturity is smaller. Holding zeros inside a traditional IRA or similar tax-deferred account avoids the annual reporting entirely.