Fixed income and bonds are closely related but not the same thing. Bonds are the most common type of fixed income investment, but “fixed income” is a broader category that also includes certificates of deposit (CDs), preferred stocks, and other instruments that pay a predictable stream of income. Think of it this way: all bonds are fixed income, but not all fixed income investments are bonds.
What Fixed Income Actually Means
A fixed income investment is any security that pays you a set amount of interest or dividends on a regular schedule and returns your original investment at the end of an agreed period. The “fixed” part refers to the predictability of those payments, not necessarily that the rate can never change (some fixed income products do have variable rates).
The most familiar fixed income products are bonds, but the category also includes Treasury bills, CDs, and preferred stock shares. Preferred stock is a hybrid between a stock and a bond: you own a share of the company, but it pays guaranteed dividends at a set rate, behaving more like a bond than a typical stock.
How Bonds Work
When you buy a bond, you’re lending money to the issuer, whether that’s a corporation, a city government, or the U.S. Treasury. In return, the issuer pays you interest (called the coupon) at regular intervals and gives back your principal when the bond matures. A bond with a $1,000 face value and a 5% coupon rate pays you $50 per year until the maturity date, then returns your $1,000.
The coupon rate is locked in when the bond is issued and never changes over the life of the bond. That fixed dollar amount is what makes bonds the flagship product of the fixed income world.
Main Types of Bonds
The three categories you’ll encounter most often differ mainly in who’s borrowing the money and how much risk you’re taking.
- Treasury bonds are issued by the U.S. government and considered among the safest investments available. That safety comes with a trade-off: lower yields than other bonds. Investors typically use Treasuries as a stable, long-term anchor in a portfolio.
- Corporate bonds are issued by companies to finance operations or expansion. The risk and return vary widely depending on the company’s creditworthiness. A bond from a financially strong corporation pays less interest than one from a riskier company, because you’re being compensated for the higher chance of default.
- Municipal bonds are issued by state and local governments, often to fund infrastructure projects. They frequently offer tax advantages that make them attractive to investors in higher tax brackets.
Coupon Rate, Yield, and Yield to Maturity
These three terms describe different ways of measuring what a bond pays you, and mixing them up is easy.
The coupon rate is the simplest: it’s the annual interest payment as a percentage of the bond’s face value. A $1,000 bond with a 4% coupon pays $40 a year, period. That number is set when the bond is issued and stays the same.
Current yield reflects what you actually earn relative to what you paid. If you bought that same $1,000 bond on the secondary market for $950, your current yield is higher than 4% because you’re getting $40 a year on a $950 investment (about 4.2%). When you first buy a bond at its face value, the coupon rate and yield are the same. They diverge once the bond trades on the open market at a price above or below face value.
Yield to maturity (YTM) is the most complete measure. It estimates your total return if you hold the bond until it matures, factoring in the coupon payments, the current market price, and the difference between what you paid and what you’ll get back at maturity. A bond purchased above face value (at a premium) will have a YTM lower than its coupon rate because you’ll lose a bit of principal when the bond matures at face value. Generally, everyday investors focus on the coupon rate when choosing a bond, while traders pay closer attention to yield to maturity.
How Interest Rates Affect Bond Prices
This is the single most important dynamic for bond investors to understand: bond prices move in the opposite direction of interest rates. When rates rise, existing bond prices fall. When rates drop, existing bond prices climb.
The logic is straightforward. If you hold a bond paying 3% and new bonds start paying 5%, nobody wants to buy your 3% bond at full price. Its market value drops until the effective yield matches what’s available elsewhere. Longer-term bonds are more sensitive to this effect because you’re locked into that lower rate for more years.
In early 2025 and into 2026, the U.S. 10-year Treasury yield has continued to rise modestly, driven in part by energy prices and shifting inflation expectations. The Federal Reserve has kept its focus on managing the recent price pressures, which means interest rate movements remain a live concern for anyone holding bonds or considering buying them. Bonds with variable or floating rates tend to be less affected by these swings, since their payments adjust along with market rates.
Why the Distinction Matters for Investors
Understanding that fixed income is broader than bonds opens up more options. If you want predictable income but prefer something simpler than buying individual bonds, a CD at your bank is also a fixed income product, typically insured by the FDIC. If you want equity exposure with bond-like income, preferred stock offers guaranteed dividends. And if you buy a fixed income mutual fund or ETF, the fund likely holds a mix of bonds, Treasuries, and possibly other instruments.
When someone says they’re “adding fixed income to their portfolio,” they almost always mean bonds or bond funds. But knowing the full menu helps you pick the right tool for your situation, whether your priority is safety, higher yield, tax efficiency, or some combination of the three.