A bond is essentially a loan you make to a borrower — usually a government or a company — in exchange for regular interest payments and the return of your money at a set date. When you buy a bond, you are the lender. The borrower agrees to pay you a fixed rate of interest, called the coupon, on a schedule, and then repay the original amount, called the face value, when the bond matures. That predictable income and the eventual return of principal are why bonds are seen as steadier than stocks and why investors use them to balance out a portfolio. Using bonds to steady a mix of holdings is a core idea in how to diversify your portfolio in 2026.
How a bond works
Three numbers define a basic bond: the face value (what you get back at the end), the coupon (the interest rate it pays), and the maturity (when the loan is repaid). For example, a bond with a $1,000 face value and a 4% coupon pays $40 a year until maturity, then returns the $1,000. If the issuer is reliable, those payments are dependable. The catch is that bonds can be bought and sold before maturity, and their market price changes — which is where bonds get less simple than they first appear.
Why bond prices move
Bond prices move in the opposite direction of interest rates. If you hold a bond paying 4% and new bonds start paying 5%, yours becomes less attractive, so its market price falls until its effective yield matches. If rates fall instead, your higher-paying bond becomes more valuable and its price rises. This is interest-rate risk, and it is why even high-quality bonds are not free of price swings.
| Type |
Issuer |
General risk level |
| Government bonds |
National treasury |
Lower default risk, varies by country |
| Municipal bonds |
States, cities |
Low to moderate, possible tax perks |
| Corporate bonds |
Companies |
Higher yield, higher default risk |
| High-yield (junk) |
Lower-rated companies |
Highest yield, highest default risk |
Why bonds matter in a portfolio
Bonds tend to be less volatile than stocks and often hold up when stocks fall, so they cushion a portfolio and provide income. A common idea is to hold more bonds as you near a goal like retirement, trading some growth for stability. But bonds are not a guarantee — these are general principles, not personalized advice, so verify your own situation and risk tolerance before setting an allocation.
The real risks
- Interest-rate risk: rising rates push existing bond prices down.
- Default risk: the issuer may fail to pay, which is why ratings exist.
- Inflation risk: a fixed coupon loses purchasing power if inflation runs hot.
- Liquidity risk: some bonds are harder to sell quickly at a fair price.
What to skip
- Assuming bonds cannot lose money. Sell before maturity after rates rise and you can realize a loss.
- Reaching for the highest yield without checking the rating. A fat coupon often signals real default risk.
- Holding individual bonds when a low-cost bond fund would diversify you far more easily.
FAQ
What is the difference between a bond and a stock?
A stock makes you a part-owner of a company with no fixed return. A bond makes you a lender who is promised interest and the return of principal, which generally makes bonds steadier but lower-growth.
Do bonds always pay a fixed amount?
Most traditional bonds pay a fixed coupon, but some adjust with inflation or floating rates. The fixed-coupon type is the classic case described here.
Are government bonds risk-free?
No investment is truly risk-free. Bonds from stable governments carry very low default risk, but they still face interest-rate and inflation risk.
Should beginners buy individual bonds or bond funds?
Many beginners prefer low-cost bond funds because they spread risk across many bonds and are easy to buy. Individual bonds give you a known payoff date but require more capital to diversify.
Where to go next
See what is a stock in 2026, what is a dividend in 2026, and the best low-risk investments for 2026.