Key Takeaways
- A bond is essentially a loan from an investor to a government or company, repaid with interest.
- Bonds pay regular interest (called a coupon) and return the principal at a set maturity date.
- Bond prices and interest rates move in opposite directions — a key concept for investors.
- Bonds are generally considered lower-risk than stocks, but they are not risk-free.
- Credit ratings help investors assess the likelihood that a bond issuer will repay its debt.
- Bonds can play a stabilizing role in a diversified investment portfolio.
Bond
A bond is a loan that an investor makes to a borrower — typically a government or corporation — in exchange for regular interest payments and the return of the original loan amount at a set future date. Think of it as an IOU with a predictable payment schedule. The borrower gets funding, and the investor earns income over time.
Bonds are formally classified as fixed-income securities. Their price on the secondary market moves inversely to interest rates — when rates rise, existing bond prices typically fall, and vice versa.
What a Bond Actually Is
When a government needs to fund infrastructure or a company wants to expand operations, they often borrow money. One common way to do that is by issuing bonds — essentially dividing a large loan into smaller pieces that many individual investors can buy.
When you purchase a bond, you are lending money to the issuer. In return, the issuer promises two things: regular interest payments (called the coupon) over the life of the bond, and repayment of the original loan amount (called the principal or face value) on a specific date known as the maturity date.
For a plain-English breakdown of these and other investing terms, see our investing glossary.
$26T+
U.S. Treasury debt outstanding
The U.S. government is one of the world's largest bond issuers, with trillions in outstanding Treasury securities held by domestic and international investors.
~40%
Typical bond allocation in balanced portfolios
A traditional balanced portfolio often targets roughly 40% bonds and 60% stocks, though individual allocations vary widely based on goals, age, and risk tolerance.
Types of Bonds and Who Issues Them
Bonds come from several types of issuers, each with a different risk and return profile:
- U.S. Treasury bonds are issued by the federal government and are broadly considered among the lowest-risk bonds available, backed by the full faith and credit of the U.S. government.
- Municipal bonds are issued by state and local governments, often to fund schools, roads, or utilities. Interest on many municipal bonds is exempt from federal income tax.
- Corporate bonds are issued by companies. They typically pay higher interest rates than government bonds to compensate investors for the added risk that a company — unlike a government — could go bankrupt.
Understanding how bonds fit alongside stocks and cash is useful context. Our article on the three core asset classes explains how each behaves and interacts in a portfolio.
How Bond Prices and Interest Rates Interact
One of the most important — and counterintuitive — features of bonds is that their market price moves in the opposite direction of interest rates. Here is why: when new bonds are issued at higher interest rates, older bonds paying lower rates become less attractive. To sell an older bond, its price must drop to make up for the lower coupon.
This matters most if you plan to sell a bond before it matures. If you hold a bond to maturity, you will receive the full face value regardless of price fluctuations along the way — assuming the issuer does not default.
Hold to Maturity to Reduce Price Risk
If you are concerned about bond price fluctuations caused by changing interest rates, holding a bond until its maturity date eliminates that uncertainty — you receive the full face value at the end regardless of interim price movements. This strategy works best when you will not need access to the invested funds before the bond matures.
It is worth noting that bonds represent the borrower's side of a debt relationship. For a broader look at how debt works from the borrower's perspective, our piece on good debt vs. bad debt offers useful context.
Why Investors Use Bonds
Bonds serve several practical purposes in a financial plan:
- Income: Coupon payments provide a predictable stream of cash, which can be valuable for retirees or anyone seeking regular income.
- Stability: Bonds tend to be less volatile than stocks, which can help cushion a portfolio during periods of market turbulence.
- Diversification: Because bonds and stocks often move differently in response to economic events, holding both can reduce overall portfolio swings.
Bonds are not a replacement for growth-oriented investments like stocks, and they carry their own risks — including inflation risk (where rising prices erode the purchasing power of fixed payments) and credit risk. For a broader foundation on investing principles, see our comprehensive introduction to investing.
This article is for general informational and educational purposes only and does not constitute personalized financial, investment, or tax advice. Consult a qualified financial professional before making decisions about your own financial situation.