Understanding how the bond market works is crucial; it directly affects interest rates on everything from savings accounts to mortgages and plays an important role in building a balanced investment portfolio.
The U.S. bond market is one of the largest financial markets in the world, representing about 36% of the total global bond market. The European Union holds about 19% of the total global bond market and China accounts for about 18%.
How Bonds Work
A bond is a loan that the bond purchaser, or bondholder, makes to the bond issuer. Governments, corporations, and municipalities issue bonds when they need capital, as an alternative to borrowing money from a bank or other financial institution. An investor who buys a government bond is essentially lending money to the government. The U.S. bond market operates via primary markets (new issuance) and secondary markets (trading existing bonds), with prices moving inversely to interest rates.
Bonds are often referred to as “fixed income” investments because they typically pay interest on a specified schedule. Like a loan, a bond pays out interest periodically and repays the principal at a stated time known as maturity.
Those predictable payments can make bonds attractive to a wide range of investors. The U.S. fixed-income market is a broader category that includes the U.S. bond market plus non-bond debt instruments such as certificates of deposit (CDs), commercial paper, and certain money-market instruments that provide a regular, fixed stream of interest
The worldwide market for fixed-income securities of all types totaled $160.7 trillion in 2025. The U.S. fixed-income market is the world’s largest at $73 trillion, or 45% of the total. (That figure includes all types of debt securities from both public- and private-sector issuers.)
Types of Bonds
U.S. Treasury Bonds are issued by the federal government to fund operations. These bonds are considered low-risk, suitable for safe income.
Municipal Bonds (“Munis”) are issued by states, cities, or counties to fund public projects and services, such as roads and schools. Though the interest from these bonds is often exempt from federal income taxes, the gains and losses from buying and selling the bunds are not. Nevertheless, the interest tax exemption generally appeals to investors in higher tax brackets. Munis typically fall into one of two categories. General obligation bonds, usually highly rated, are backed by the taxing authority of an issuing municipality. Revenue bonds, which account for more than two-thirds of investment-grade municipal bonds, are backed by funds from a specific source or project such as tolls or fees.
Corporate Bonds are issued by companies to raise capital for several reasons, such as expanding operations, purchasing new equipment, or building new facilities. Historically, returns have increased with lower credit ratings, reflecting the premium paid to investors for taking higher expected risks. Investment-grade bonds have higher credit ratings, while high-yield bonds offer higher interest to compensate for increased risk. Investment-grade corporate bonds are issued by companies with credit ratings of Baa3 or BBB- or above and therefore have a relatively low risk of default. High-yield corporate bonds (also known as “junk” bonds) are issued by companies with credit ratings of Ba1 or BB+ or below and therefore have a relatively higher risk of default.
Agency Bonds are issued by government-sponsored enterprises (e.g., Fannie Mae). They offer higher yields than Treasuries but slightly higher risk.
The values of stocks issued by certain companies will fluctuate much more than bonds issued by the same companies. When companies issue bonds, they are contractually obligated to make the specified interest payments as promised, and to return the face value when the bond matures.
Defaulting on a bond is a serious matter and will typically force a company into bankruptcy. Companies place a high priority on making timely bond payments. Because the terms of a specific bond are known in advance, the value of that bond will usually fluctuate in a relatively narrow range compared with stocks.
U.S. government securities are the biggest piece of the overall U.S. bond market. Most U.S. government debt is tradable (about 78.8%, or $31.5 trillion as of August 2026). Treasury securities that aren’t tradable include U.S. savings bonds and the special bonds held by the Social Security and Medicare trust funds. This is more than twice the amount of corporate bonds (about $11.7 trillion). Interest on US government securities is taxable on the federal level but exempt from state and local taxes.
Marketable Debt and Public Auctions
Marketable debt primarily consists of the bills, notes, and bonds that Treasury issues through public auctions. Each year, Treasury conducts hundreds of auctions for debt of maturities as short as four weeks and up to 30 years. The most widely followed Treasury yield is the 10-year note, as it is driven by long-term expectations and serves as a benchmark for other key borrowing costs in the economy, such as mortgages.
Through this process, the federal government receives money from the public to finance budget deficits. In return, it pays interest on the debt and repays the principal when the security reaches maturity. The amount of marketable debt has surged in recent years. In 2000, $3.2 trillion in marketable debt was outstanding, and during a brief period of government surpluses, the total declined slightly. However, the budget returned to deficits, and borrowing sharply accelerated following the 2008 Great Recession and during the 2020-21 pandemic.
Each quarter, Treasury issues statements estimating how much it expects to borrow in the coming quarters to meet financing needs and maintain its cash balance. Borrowing needs vary seasonally based on factors such as the timing of tax collections. The second quarter of the year (April through June) typically sees relatively low borrowing because of income tax collections in April and large corporate receipts in June.
Beyond overall deficit trends, the pace of borrowing can be impacted by the strength or weakness of revenue collections, sudden changes in spending needs like a natural disaster, or constraints on borrowing when the government reaches the debt limit or unwinds its extraordinary measures after the limit is increased.
As the Iran War supply squeeze has pushed inflation higher and concerns about growing government deficits, we have seen a global bond market sell-off. The 10-year Treasury yield rose just above 5% on September 15, while the 30-year Treasury hit 5.4%, the highest yields for both since 2007. Investors increased selling of other global bonds as well, pushing yields on 10-year German and Japanese government debt to multiyear highs.
The Treasury yield rises when demand for bonds goes down because lower demand pushed bond prices down and bond prices and yields have an inverse relationship. When bond yields started to rise in August 2026, the U.S. announced it would triple its buyback of government debt, going from $2 billion to $6 billion in an effort to bring down bond yields. However, the effort did not pay off, as the yields continued to rise since the buyback
Earlier in August 2026, the U.S. also stepped in to prop up the Japanese yen, a move that was seen as an effort to protect the Japanese government, a major holder of U.S. bonds.
While the U.S. bond market is the largest in the world, there is opportunity in the global debt market. This market offers access to a wider set of bonds, issuers, and yield curves which can provide an opportunity to enhance diversification and expected returns.
International bonds may be denominated in local currency, U.S. dollars, or other hard currencies. There are basically two types of international bonds: developed and emerging. Developed market bonds tend to have higher credit ratings than emerging market bonds, reflecting the elevated risk of default.
Interest and the Yield Curve
Prices and interest rates for an individual bond depend on a variety of factors, including positive or negative news about the issuer or changes in its credit rating. The bond market is more affected by changes in interest rates than by anything else. Bond values move in the opposite direction when interest rates change. When rates go up, bond prices fall, and when rates go down, bond prices rise.
When investors are alarmed by volatility in the stock market, they often move money into bonds. This pushes bond prices up and yields down. When this yield curve is inverted, bonds with shorter durations have to offer higher interest rates. This is because investors prefer to lock in the current yield for as long as possible, on the assumption that it will be a long time before yields are as good again. interest rates to entice investors into tying up their money for a long time.
Conclusion: Yellow Light
Investors should be cautious not to let opinions and resulting emotions dictate portfolio decisions. A more constructive approach would be to carefully evaluate what you own, assess diversification and risk characteristics and verify if current exposures are aligned with long-term goals.
As always, if you have any questions about this report or any other questions, please reach out to Bowen Asset at info@bowenasset.com or (610) 793-1001.
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