Bond Loan Definition: Types, Risks, and How to Buy

A bond is a loan you make to a government, corporation, or other large borrower, packaged as a tradable security. You hand over a lump sum upfront; in return, the issuer promises to pay you interest on a set schedule and return your original amount on a specific date. Bonds are the core of the fixed-income market and give big organizations a way to raise money from many investors at once rather than borrowing from a single bank.¹

How a Bond Works

Every bond has three defining numbers. The face value (also called par value) is what the issuer returns to you when the bond matures, typically $1,000 per bond. The coupon rate is the annual interest, expressed as a percentage of face value. The maturity date is when the loan ends and you get your principal back.¹

A quick example. A bond with a 5% coupon and a $10,000 face value pays $500 a year in interest, usually split into two $250 payments six months apart. On the maturity date, the issuer sends its final interest payment along with the $10,000 face value, and the loan is done.²

The coupon payment never changes over the life of the bond. That’s what makes bonds “fixed income” — you know at purchase exactly how much you’ll receive and when.

Types of Bonds by Who Issues Them

The borrower largely determines the risk, the return, and the tax treatment.

Corporate Bonds

Companies issue these to fund operations, expansions, or acquisitions. Corporate bonds pay higher interest than government bonds because the company could run into trouble and miss payments. Rating agencies grade this credit risk. Bonds rated BBB or higher by Standard & Poor’s (Baa or higher by Moody’s) are investment-grade. Anything below is called high-yield or “junk” — more interest, more chance of default.³

Municipal Bonds

State and local governments issue municipal bonds to pay for things like schools, roads, and water systems. The main attraction is tax treatment: interest is generally exempt from federal income tax, and often from state and local taxes if you live in the issuing state.⁴

There are two main types. General obligation bonds are backed by the taxing power of the issuing government. Revenue bonds are backed only by income from a specific project, like a toll road or airport, and typically pay a bit more interest because that project actually has to generate money.⁴

U.S. Treasury Securities

The federal government issues several types of debt through the Treasury:

Treasury Bills (T-Bills): short-term debt maturing in 4 to 52 weeks. T-Bills don’t pay periodic interest; you buy them at a discount and receive full face value at maturity.
Treasury Notes (T-Notes): 2-, 3-, 5-, 7-, or 10-year terms, paying interest every six months.
Treasury Bonds (T-Bonds): 20- and 30-year terms, also paying semiannual interest.
TIPS: Treasury Inflation-Protected Securities in 5-, 10-, or 30-year terms. The principal adjusts up with inflation and down with deflation based on the Consumer Price Index, and at maturity you receive the higher of the adjusted principal or the original face value.

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Treasury securities are considered the safest bonds available because they’re backed by the full faith and credit of the U.S. government. In exchange for that safety, they pay less than corporate or municipal bonds.¹

Zero-Coupon Bonds

Not every bond pays periodic interest. Zero-coupon bonds are sold at a deep discount and pay nothing until maturity, when you receive the full face value. The gap between what you paid and what you get back is your return. You might pay $600 today for a zero-coupon bond that pays $1,000 in 15 years.⁷

The catch is taxes. The IRS treats part of that discount as “imputed interest” each year and expects you to pay tax on it even though no cash has changed hands. Holding zero-coupon bonds in a tax-advantaged account like an IRA sidesteps the problem.⁷

Coupon Rate Versus Yield

Once a bond is issued, it can trade among investors on the secondary market, and its price moves. The single most important idea in bond investing is that bond prices and interest rates move in opposite directions.

Say you own a bond with a 4% coupon and newly issued bonds start paying 6%. Nobody will pay full price for your 4% bond when they can buy a fresh 6% one instead, so your bond’s market price drops below face value — it trades at a discount. If rates fall to 2%, your 4% bond looks better than what’s on offer, and its price rises above face value, trading at a premium. The coupon payment itself doesn’t change; only the price does.

Because of this, the coupon rate alone doesn’t tell you what a bond will actually earn you if you buy it today. That’s captured by yield to maturity, which folds in the current price, every remaining coupon payment, and the gain or loss you’d realize when the bond repays face value at maturity. A bond bought at a discount has a yield to maturity higher than its coupon rate; a bond bought at a premium has a lower one. Yield to maturity is how investors compare bonds with different prices, coupons, and maturities on the same footing.

How Bond Income Is Taxed

The issuer type decides how the interest is taxed.

Corporate bonds: interest is taxed as ordinary income at the federal, state, and local levels.⁸
Treasury securities: interest is subject to federal income tax but exempt from state and local income taxes.⁹
Municipal bonds: interest is generally exempt from federal income tax and may also be exempt from state and local taxes, especially if you live in the issuing state.⁴

Because of their tax advantage, municipal bonds usually offer lower coupon rates than taxable bonds. The number worth calculating is tax-equivalent yield, meaning what a taxable bond would need to pay to match a muni’s after-tax return. In a high tax bracket, a lower-yielding muni can beat a higher-yielding corporate once taxes are subtracted.

The Main Risks

Bonds are less volatile than stocks, but they’re not risk-free.

Credit Risk

The issuer might miss an interest payment or fail to return your principal. This matters most for corporate and lower-rated municipal bonds. The shakier the market thinks an issuer is, the higher the interest rate it has to offer to attract buyers.¹

Interest Rate Risk

If rates rise after you buy, the market price of your bond drops. Longer maturities are more sensitive, a sensitivity measured by duration: higher duration, bigger price swing when rates move.¹⁰ Interest rate risk only bites if you sell early. Hold to maturity and you receive the full face value regardless of what happened to the market price along the way.

Inflation Risk

A bond paying 3% while inflation runs at 4% loses purchasing power. Your interest buys less each year, and the face value you get back at the end is worth less than the money you originally put in. TIPS are designed specifically to address this.¹

Call Risk

Some bonds include a call provision letting the issuer pay you back early, usually when rates have dropped and they can refinance cheaper. Your high-paying bond disappears and you’re left reinvesting at lower rates. Callable bonds typically offer a slightly higher coupon to compensate. If you’re evaluating one, look at yield-to-call, which assumes the issuer redeems at the earliest possible date and gives you a more conservative picture of your return.¹¹

What Happens if the Issuer Defaults

Bondholders don’t automatically lose everything. In a corporate bankruptcy, bondholders rank ahead of stockholders when remaining assets are divided up. Stockholders are last in line and often get nothing.¹²

Among bondholders, seniority sets the order. Senior secured bondholders, whose claims are tied to specific company assets, are paid first. Senior unsecured bondholders come next. Subordinated (junior) bondholders are paid only after senior claims are satisfied.¹³ Recovery rates vary widely: senior secured bondholders in a default may recover 50 cents on the dollar or more, while subordinated bondholders often receive far less. This hierarchy is why senior bonds carry lower yields — you accept less return in exchange for a better position if things go wrong.

How to Buy a Bond

You can buy Treasury securities directly from the government at TreasuryDirect.gov with no broker and no commission. It’s the most accessible route for individual investors and the only way to buy newly issued savings bonds.⁵

For corporate and municipal bonds, you’ll need a brokerage account. Most brokerages give you access to both new issues and the secondary market. New issues sometimes carry no additional fee; secondary-market trades usually include a markup built into the price rather than a separate commission. The bond market is much less transparent than the stock market, over a million unique bonds exist and only a fraction trade on any given day, so selection can be limited and comparing prices across dealers takes effort.

Bond mutual funds and ETFs are the simpler route. You buy shares of a fund holding hundreds or thousands of bonds and get instant diversification along with the ability to trade during market hours. The trade-off: a fund has no single maturity date, so you give up the certainty of getting a fixed face value back on a set day.

1
Investor.gov. Bonds
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Municipal Securities Rulemaking Board. Interest Payments
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FINRA. Bonds
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Municipal Securities Rulemaking Board. Municipal Bond Basics
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TreasuryDirect. About Treasury Marketable Securities
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TreasuryDirect. Treasury Inflation-Protected Securities (TIPS)
7
FINRA. The One-Minute Guide to Zero Coupon Bonds
8
Internal Revenue Service. Topic No. 403, Interest Received
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TreasuryDirect. Tax Information for EE and I Savings Bonds
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FINRA. Brush Up on Bonds – Interest Rate Changes and Duration
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FINRA. Callable Bonds – Be Aware That Your Issuer May Come Calling
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U.S. Securities and Exchange Commission. Saving and Investing
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United States Courts. Chapter 11 Bankruptcy Basics