Bonds are the steady, predictable counterpart to stocks in a balanced portfolio. While stocks offer growth, bonds provide income, capital preservation, and a buffer against stock market volatility. In 2026, with Treasury yields above 4% for the first time in nearly two decades, bonds are more relevant to individual investors than they've been since before the 2008 financial crisis. This guide covers everything a beginner needs to know.
What Is a Bond?
A bond is a loan you make to a government or corporation. In exchange for your money, the issuer promises to pay you regular interest (called the coupon) and return your principal (the face value) on a specific maturity date. A 10-year US Treasury bond with a $1,000 face value and a 4% coupon pays $40 per year ($20 every six months) and returns $1,000 after 10 years. That's the basic contract.
Types of Bonds
US Treasury Bonds: Backed by the full faith and credit of the US government. Virtually zero default risk. Interest is exempt from state and local taxes. Treasury bonds come in three maturities: Treasury bills (T-bills: 4 weeks to 1 year), Treasury notes (2-10 years), and Treasury bonds (20-30 years). In 2026, 10-year Treasury yields around 4.2% provide meaningful income for the first time since 2007.
Corporate Bonds: Issued by companies to fund operations, acquisitions, or expansion. Higher yields than Treasuries (typically 1-3% more) but carry default risk. Rated by agencies like Moody's and S&P: "investment grade" (BBB-/Baa3 and above) carries low default risk; "high yield" or "junk" bonds offer higher yields but higher risk. The average default rate for investment-grade corporate bonds is below 0.5% per year; for junk bonds, it averages 3-5%.
Municipal Bonds (Munis): Issued by states, cities, and local governments. Interest is exempt from federal income tax and, if you live in the issuing state, often exempt from state tax too. This tax advantage means munis typically offer lower nominal yields than Treasuries but higher after-tax yields for investors in high tax brackets. A muni yielding 3% is equivalent to a 4.8% taxable yield for someone in the 37% federal tax bracket.
TIPS (Treasury Inflation-Protected Securities): The principal value adjusts with inflation (CPI). If inflation rises 3%, your $1,000 TIPS bond becomes a $1,030 bond. The coupon rate is fixed, but it pays against the inflation-adjusted principal, so your interest payments rise with inflation. Essential for retirement portfolios where inflation is the biggest long-term risk.
The Bond Price-Yield Relationship
When interest rates rise, existing bond prices fall. When rates fall, bond prices rise. This inverse relationship is the most important bond concept to understand. Example: you own a 10-year bond yielding 3%. New 10-year bonds are issued at 5%. Your 3% bond is less attractive, so its market price drops until its effective yield matches market rates — a decline of approximately 15-17% for a 10-year bond. This price sensitivity is called "duration." Longer-maturity bonds have higher duration and are more sensitive to rate changes. This is why 2022 was the worst year for bonds in modern history — the Fed raised rates at the fastest pace in 40 years, and long-term bond funds fell 25-30%.
Individual Bonds vs. Bond Funds
Individual bonds: You know exactly what you'll earn if held to maturity. The price fluctuates along the way but the final payout is guaranteed (assuming no default). Best for known future expenses like a child's college tuition in 5 years.
Bond funds (ETFs/mutual funds): Diversified across hundreds or thousands of bonds. More liquid and simpler. No fixed maturity — the fund constantly buys and sells bonds to maintain its target duration. Price fluctuates with interest rates. Best for retirement portfolios where you need ongoing bond exposure.
Use our bond yield calculator to compare Treasury, corporate, and municipal bond returns, factoring in your tax bracket and the bond's duration.