A debt security through which governments, companies and other bodies borrow from investors, paying interest and repaying the principal at maturity
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A bond is a debt security: an investor lends money to a government, company or other body for a set time, and the issuer promises to pay interest along the way and to repay the amount borrowed when the bond matures.
Via Wikimedia Commons: Bond certificate (AM 793575).jpg), CC BY 4.0.
The U.S. Securities and Exchange Commission (SEC) describes a bond as a debt security, like an IOU: a buyer of a bond is lending to the issuer, which may be a government, a municipality or a corporation, and the issuer promises a specified rate of interest during the life of the bond and repayment of the principal when it comes due. Because most bonds provide fixed interest payments until the bond matures, they are also called fixed-income securities. This entry explains how bonds work, chiefly using United States examples, where most of its sources come from.
A bond is described by a few numbers fixed when it is issued:
Some bonds pay no coupon at all. U.S. Treasury bills, for instance, are non-interest-bearing (zero coupon) securities with maturities of a few days to 52 weeks.
Bonds let a borrower raise a large sum from many lenders at once. According to the SEC, companies, governments and municipalities issue bonds for purposes that include providing operating cash flow, financing debt, and funding capital investments in schools, highways, hospitals, and other projects.
The SEC lists three reasons investors buy them: they provide a predictable income stream, usually with interest paid on a regular schedule such as every six months; a bond held to maturity returns its whole principal, so bonds are a way to preserve capital; and they can help offset the swings of stock holdings.
A bondholder is a lender, not an owner. FINRA points out that the buyer of a corporate bond receives the equivalent of an IOU from the issuer and no ownership rights in the company, but is more likely than common stockholders to recover some of the investment if the company goes bankrupt.
The SEC divides U.S. bonds into three main types:
FINRA adds several others. Agency securities are issued by federal agencies other than the Treasury or by government-sponsored enterprises, and with the exception of bonds issued by Ginnie Mae are not fully guaranteed by the U.S. government. Asset-backed securities pay out of a pool of loans or receivables; mortgage-backed securities are bonds secured by home and other real estate loans, most of them issued by Ginnie Mae, Fannie Mae or Freddie Mac (see Mortgage). U.S. savings bonds (Series EE and I) differ from most bonds in that only the person(s) in whose name a savings bond is registered can receive payment for it.
A bond's face value and coupon stay fixed for its life, but once it has been issued it can be resold, and its price then moves with the market. FINRA explains that bond prices are quoted as a percentage of par: a $1,000 bond trading at par is said to be trading at 100, one quoted at 105 is trading at a premium for $1,050, and one at 95 at a discount for $950.
The central rule is that bond prices and interest rates move in opposite directions. When interest rates rise, newly issued bonds pay more, so an older bond with a lower coupon can be sold only at a discount; when rates fall, an older bond with a higher coupon becomes worth more. The SEC puts it the same way: to sell an older bond with a lower interest rate, you might have to sell it at a discount.
The yield is the return a buyer earns at a given price, and it moves inversely to the price. A worked illustration, calculated for this entry, shows the size of the effect. Take a bond with a face value of $1,000, a 4 percent coupon paid as $20 every six months, and ten years left to run. Its price is the present value of those 20 coupon payments and the final $1,000, discounted at the rate buyers now demand:
The longer the time to maturity, the larger the swing: at a 5 percent market yield, the same 4 percent bond with 30 years left would be worth about $845, but with two years left about $981. Someone who holds any of these bonds to maturity still receives every coupon and the $1,000 at the end; the price change matters to anyone who sells before then.
The Treasury publishes the yields on its securities every business day; on 6 November 2026 its par yield curve put the 10-year yield at 4.86 percent and the 30-year at 5.26 percent, against 4.02 percent for one month.
The SEC lists the main risks of bonds:
Credit rating agencies grade issuers and their bonds. The SEC defines a credit rating as an assessment of an entity's ability to pay its financial obligations. A typical scale runs from a top rating of AAA down to D for default, and agencies that separate investment grade from non-investment grade (also called speculative or high yield) draw this distinction between the 'BBB' and 'BB' rating categories. Agencies registered with the SEC are called nationally recognized statistical rating organizations (NRSROs). The SEC stresses that a rating is not a guarantee: instruments rated at this level sometimes default, even at AAA, and by law the SEC may not regulate the substance of ratings or the methods used to reach them.
Borrowing by selling transferable debt is centuries old. One early survivor is held by Yale University: a bond issued on 15 May 1648 by the Hoogheemraadschap Lekdijk Bovendams, a Dutch water board, to pay for improvements to a local dike. It was a perpetual bond, one with no maturity date, for 1,000 Carolus guilders, originally paying 5 percent a year, later cut to 3.5 and then 2.5 percent. Yale acquired it in 2003, and in 2015 the water board's successor, Stichtse Rijnlanden, paid it 136.20 euros covering twelve years of interest.
War has repeatedly driven government borrowing. The Bank of England, which opened for business on 1 August 1694, began as a private bank to act as banker to the government and was primarily founded to fund the war effort against France; its early years were dominated by the government's demands for finance.
In the United States, the Treasury paid for the First World War largely by selling Liberty Bonds to the public. In a Federal Reserve History essay, Richard Sutch describes four Liberty Loan drives, the first announced on 28 April 1917, followed by a fifth "Victory Loan" after the armistice. The Federal Reserve and its member banks conducted the sales; more than $17 billion was raised through bonds, against $8.8 billion from taxes, so that almost exactly two-thirds of the war funds came from bonds. By the war's end, Sutch writes, twenty million individuals had bought them.
Via Wikimedia Commons: Liberty Loan of 1917 LCCN00652842 by Unknown author Unknown author, public domain.
The bond market is far larger than most people picture. The Securities Industry and Financial Markets Association (SIFMA), an industry group, put U.S. fixed-income securities outstanding at $51.4 trillion as of the second quarter of 2026, up 7.0 percent from a year earlier, a figure that excludes mortgage-backed and asset-backed securities.
Bonds can be bought when they are first sold (the primary market) or traded afterwards (the secondary market). FINRA notes that corporate bonds mostly trade in the over-the-counter (OTC) market, and that it collects trade reports on many bonds through a system called TRACE. Treasury bonds can be bought directly from the government at auction or through a bank or broker. Many investors hold bonds indirectly through bond funds, mutual funds or exchange-traded funds that invest in bonds.
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