A bond is a loan you make to a government, corporation, or municipality in exchange for regular interest payments and the return of your original investment on a set date. When you buy one, you become a creditor of the issuer, not an owner, and the issuer is legally obligated to pay you interest on a fixed schedule and repay your principal at maturity. That predictability is what makes bonds a cornerstone of most investment portfolios and a primary way large organizations raise money without selling ownership stakes.
How a Bond Works
Think of a bond as a structured IOU. You hand over a lump sum to an issuer, and in return you get a contract spelling out exactly how much interest you’ll earn, how often you’ll be paid, and when you’ll get your original money back. The issuer uses the funds however it needs to, whether that’s building a highway, funding an acquisition, or refinancing older debt, and you collect interest in the meantime.
A bondholder has no vote in how the organization is run and no claim on its profits. But bondholders do sit ahead of stockholders if things go wrong. In a bankruptcy or liquidation, creditors are paid from the company’s remaining assets before shareholders see a dollar.1eCFR. 12 CFR Part 380 Subpart B – Priorities That legal priority is one reason bonds are generally considered less risky than stocks from the same issuer. Less risky is not risk-free.
The Numbers That Define Every Bond
Every bond comes with a handful of figures that determine what you’ll earn and when. Understanding them lets you compare one bond against another the way you’d compare mortgage offers.
Par Value
Par value, sometimes called face value, is the amount the issuer promises to pay you when the bond matures. Most corporate and government bonds are issued with a par value of $1,000, though some corporate issues come in $100 or $500 denominations. This number stays fixed for the life of the bond regardless of what happens to its market price, and it’s the base for calculating interest payments.
Coupon Rate
The coupon rate is the annual interest percentage the issuer pays on par value. A bond with a 5% coupon and a $1,000 par pays $50 a year in interest, typically split into two $25 semi-annual payments.2MSRB. Interest Payments On a fixed-rate bond the coupon is locked in at issuance and does not change, even if market rates move dramatically.
Maturity Date
Maturity is when the issuer must return your principal. Terms range widely. Treasury bills mature in a year or less, while some government and corporate bonds run out to 30 years.3U.S. Treasury Fiscal Data. Treasury Savings Bonds Explained Longer maturities carry more exposure to changing interest rates and inflation, which is why long-term bonds typically offer higher coupon rates than short-term ones.
Yield to Maturity
The coupon tells you only part of the story. Yield to maturity (YTM) is the total annual return you can expect if you buy a bond at its current market price and hold it until it matures. It factors in the coupon payments, the price you actually paid (which may be above or below par), and the time remaining. Buy a $1,000 par bond for $950, and your YTM will be higher than the coupon rate, because you collect the same interest payments and pocket that $50 discount at the end. YTM is the single best number for comparing bonds with different prices, coupons, and maturities on the same footing.
Who Issues Bonds
U.S. Treasury Securities
The federal government issues Treasury bills, notes, and bonds to finance national spending. These are backed by the full faith and credit of the United States, meaning the government has pledged to pay principal and interest in full.4Office of the Law Revision Counsel. 31 USC 3123 – Payment of Obligations and Interest on the Public Debt That backing makes Treasuries the benchmark for safety in the bond world. Bills mature in one year or less, notes in two to ten years, and bonds in twenty to thirty. Interest is subject to federal income tax but exempt from state and local income taxes.5Office of the Law Revision Counsel. 31 USC 3124 – Exemption From Taxation
The government also offers savings bonds for individual investors. Series EE and Series I bonds can be purchased electronically through TreasuryDirect.gov for as little as $25, with a maximum of $10,000 per type per calendar year.6TreasuryDirect. How Much Can I Spend/Own Series I bonds adjust for inflation, which makes them a popular choice when consumer prices are rising.
Corporate Bonds
Companies issue bonds to raise capital for expansion, acquisitions, or refinancing existing debt. Corporate bonds must be registered under the Securities Act of 1933 (unless an exemption applies), which requires the issuer to file detailed financial disclosures with the SEC before selling to the public. In exchange for the added credit risk compared to Treasuries, corporate bonds usually offer higher coupon rates. Interest is fully taxable as ordinary income at the federal level.7Internal Revenue Service. Topic No. 403, Interest Received
Municipal Bonds
State and local governments issue municipal bonds to fund public projects like schools, roads, and water systems. The big draw is tax treatment: interest on most municipal bonds is excluded from federal gross income.8Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds That exemption makes munis especially attractive to investors in the higher federal tax brackets, which for 2026 range from 24% (starting at $105,700 for single filers) up to 37% (above $640,600).9Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 If you’re in one of those brackets, the after-tax yield on a muni can beat a higher-coupon corporate bond.
Credit Ratings, Briefly
Credit rating agencies assign letter grades to bond issuers based on their financial strength and likelihood of default. The critical dividing line is between investment grade and speculative grade (commonly called “junk” or “high yield”). On the S&P and Fitch scales, anything rated BBB- or above is investment grade; BB+ and below is speculative. Moody’s uses a parallel system where Baa3 and above is investment grade, and Ba1 and below is speculative. Speculative-grade bonds have historically defaulted at dramatically higher rates than investment-grade bonds, which is why they pay significantly higher coupons. The extra yield compensates you for the real possibility that you won’t get all your money back.
Common Bond Variations
The standard fixed-rate bond is the most common type, but several variations exist that change how your returns are calculated or when your investment might end.
Treasury Inflation-Protected Securities (TIPS)
TIPS address the problem of inflation eating away at fixed payments. The principal adjusts up with inflation and down with deflation based on the Consumer Price Index. Because the interest rate is applied to the adjusted principal, your actual dollar payments rise when prices rise.10TreasuryDirect. Treasury Inflation-Protected Securities (TIPS) At maturity, you receive either the inflation-adjusted principal or the original principal, whichever is greater, so deflation cannot reduce what you get back below what you started with.
Callable Bonds
A callable bond gives the issuer the right to pay you back early, usually after a specified date. Issuers exercise this option when interest rates have dropped, because they can retire old debt and reissue at a lower rate.11Investor.gov. Callable or Redeemable Bonds When your bond is called, you receive the face value (sometimes with a small call premium) plus accrued interest, but the stream of above-market coupon payments stops. To compensate for this, callable bonds generally offer higher coupon rates than non-callable bonds of similar credit quality.
Convertible Bonds
Convertible bonds are corporate bonds that can be exchanged for a set number of shares of the issuer’s stock. You get the downside protection of a bond along with the option to participate if the stock performs well. The trade-off is a lower coupon rate than a comparable non-convertible bond, since the conversion feature has value built in.
Zero-Coupon Bonds
Zero-coupon bonds pay no periodic interest. They are sold at a steep discount to par, and you receive the full face value at maturity. The difference is your interest, earned all at once. One tax trap catches investors off guard: the IRS treats that discount as original issue discount (OID) and taxes it as it accrues each year, even though you receive no actual cash until maturity.12Internal Revenue Service. Guide to Original Issue Discount (OID) Instruments This “phantom income” is why zero-coupon bonds are often held in tax-advantaged accounts like IRAs.
Risks of Owning Bonds
Bonds are often described as safe investments, and compared to stocks they generally are. Safer is not the same as risk-free, though, and the risks that do exist can surprise investors who treat bonds as a parking spot for cash.
Interest Rate Risk
Bond prices and market interest rates move in opposite directions. When rates rise, existing bonds with lower coupons become less attractive and their market price drops. When rates fall, existing bonds become more valuable because their locked-in coupons look generous by comparison. This relationship hits harder on longer-maturity bonds. A 30-year bond’s price swings far more in response to a rate change than a 2-year bond’s does. If you plan to hold until maturity, day-to-day price fluctuations do not affect your return. But if you need to sell early into a rising-rate environment, you could get back less than you paid.
Credit Risk
Credit risk is the chance that the issuer cannot make its interest payments or return your principal. This risk is negligible for U.S. Treasuries but very real for lower-rated corporate bonds. Ratings help you gauge the risk before you buy, but ratings change. A downgrade from investment grade to junk status causes a bond’s price to drop sharply, even if the issuer has not actually missed a payment.
Inflation Risk
A fixed coupon that looks attractive today may not keep pace with rising prices over a 10- or 30-year period. If inflation runs at 4% and your bond pays 3%, your purchasing power is shrinking every year. TIPS address this directly; standard fixed-rate bonds offer no built-in inflation protection.
Call Risk
If you own a callable bond and interest rates drop, the issuer is likely to call the bond and refinance at a lower rate. You get your principal back, but now you have to reinvest that money in a market where available yields are lower than what you had been earning.11Investor.gov. Callable or Redeemable Bonds This reinvestment problem is the main reason callable bonds pay higher coupons.
How to Buy Bonds
The buying process depends on what type of bond you’re after. For savings bonds, the only option is TreasuryDirect.gov, where you can open a free account and purchase Series EE or Series I bonds electronically for any amount between $25 and $10,000.13TreasuryDirect. Buying Savings Bonds Marketable Treasury securities (bills, notes, and bonds) can also be bought through TreasuryDirect at auction or on the secondary market through a brokerage account.
Corporate and municipal bonds are purchased through brokerage firms. Most major online brokers offer bond-screening tools that let you filter by credit rating, maturity, yield, and issuer type. Liquidity varies widely. Recently issued bonds from large corporations trade actively, while older or smaller municipal issues can be harder to buy or sell without accepting a wider markup.
Many investors access the bond market through bond mutual funds or exchange-traded funds (ETFs) rather than buying individual bonds. Funds offer instant diversification across hundreds of issuers, professional management, and easy buying and selling. The trade-off is that bond funds have no maturity date. An individual bond converges toward its par value as maturity approaches, but a fund’s share price fluctuates indefinitely because the manager is constantly buying and selling bonds within the portfolio. If interest rates rise sharply, a bond fund’s value can drop and stay down in ways that would not affect an individual bond you planned to hold to maturity. Choosing between the two comes down to whether you value the certainty of a known payout date or the convenience and diversification of a fund.