What Is a Bond and How Does It Work?

Bonds are an essential fixed-income asset class designed to provide predictable income and balance out the volatility of stock portfolios. In today’s dynamic interest rate environment, bonds and cash-equivalent instruments offer some of the most competitive yields in over a decade, making them an attractive cornerstone for capital preservation.

What is a bond?

A bond is a debt security that represents a loan made by an investor to a borrower.⁽¹⁾ While stocks represent equity ownership in a company, bonds represent debt obligations. These borrowers—known as bond issuers—are typically corporations, municipal governments or national governments seeking funds for capital projects, expansion or public infrastructure.

In exchange for lending your money, the issuer agrees to pay you regular interest—known as the coupon—over the lifespan of the bond. When the bond reaches its designated maturity date, the issuer repays the original principal balance, also known as the face value or par value. Because bonds pay predictable, scheduled interest payments, they are classified as fixed-income securities.

WATCH: What are bonds?

Types of bonds

Bonds are primarily categorized by the entity issuing the debt. The three major bond types in the US market are corporate, government and municipal bonds.

1. Corporate bonds

Corporations issue bonds to raise capital for business expansion, research, acquisitions or day-to-day operations without diluting shareholder equity. Because issuing corporate bonds is often cheaper and provides more favorable terms than traditional bank loans, large corporations frequently tap the bond market.

Corporate bonds carry higher credit risk than government bonds because private companies can face financial distress or bankruptcy. To compensate investors for this risk, corporate bonds typically offer higher yields.

Tax implications: Interest income from corporate bonds is fully taxable at both the federal and state levels.⁽¹⁾

2. Government bonds (Treasuries)

Government bonds are issued by national governments. In the US, they are issued by the US Department of the Treasury and backed by the full faith and credit of the federal government, making them virtually free of default risk.⁽²⁾

US Treasuries are categorized based on their maturity length:

• Treasury Bills (T-bills): Short-term debt with maturities of one year or less (4, 8, 13, 17, 26 and 52 weeks). T-bills do not pay coupons; they are sold at a discount and mature at face value.
• Treasury Notes (T-notes): Intermediate debt with maturities of 2, 3, 5, 7 or 10 years, paying semi-annual coupon interest.
• Treasury Bonds (T-bonds): Long-term debt with maturities of 20 or 30 years, paying semi-annual coupon interest.

Tax implications: Interest from US Treasury securities is subject to federal income tax, but 100% exempt from all state and local income taxes.⁽²⁾

Dive deeper: Compare treasury bills vs. CDs to evaluate cash options

3. Municipal bonds

Municipal bonds—commonly called “munis”—are issued by state and local governments, cities, counties and public agencies to fund public infrastructure projects such as schools, bridges, highways and water facilities.

Tax implications: Interest earned on municipal bonds is generally exempt from federal income tax.⁽³⁾ Furthermore, if you purchase bonds issued by your home state or local municipality, the interest is typically exempt from state and local taxes as well (“double” or “triple” tax-exempt). However, capital gains realized from selling munis on the secondary market are subject to taxation.

How bonds work

When an issuer sells bonds, it sets clear contractual terms: the face value, the maturity date and the coupon rate.⁽⁴⁾

• Face value (Par value): The nominal dollar amount paid to the bondholder at maturity (typically $1,000 per bond for corporate bonds, or $100 for Treasuries).
• Coupon rate: The annual interest rate paid on the bond’s face value. For example, a 4% coupon on a $1,000 bond pays $40 annually (usually split into two $20 semi-annual payments).
• Maturity date: The predetermined date when the issuer repays the bond’s face value to the bondholder.

How secondary market pricing works: An example

Bonds are negotiable securities that trade on the secondary market, meaning their market price fluctuates based on prevailing interest rates and market conditions:

1. Issuance: A corporation issues a 10-year bond with a $1,000 face value and a 4% annual coupon ($40 per year).
2. Buying at a discount: If interest rates rise in the broader market, newly issued bonds will offer higher yields. To attract buyers, the older 4% bond might drop in price to $900 on the secondary market. If you buy this bond at $900 with 5 years remaining until maturity, you receive $200 in coupon payments ($40 × 5 years) plus the full $1,000 face value at maturity. Your total gain is $300 ($200 interest + $100 capital discount) on a $900 investment—delivering a yield significantly higher than the stated 4% coupon.
3. Buying at a premium: Conversely, if market interest rates fall, existing 4% bonds become more attractive, trading above par (such as $1,050).

The inverse relationship: Bond prices vs. interest rates

The most important rule in bond investing is that bond prices and interest rates move in opposite directions:⁽⁴⁾

• When market interest rates rise, prices of existing bonds fall (because investors can buy new bonds paying higher yields).
• When market interest rates fall, prices of existing bonds rise (because older bonds with higher coupons become more valuable).

Dive deeper: Bonds vs. CDs

Key terms to know

Term	Definition
Call feature	A provision allowing the issuer to redeem (buy back) bonds before their maturity date at a set price.
Coupon	The annual interest rate paid on the bond’s face value, typically distributed semi-annually.
Credit rating	An evaluation by independent agencies measuring the issuer’s creditworthiness and default risk.
Default	Failure of the bond issuer to make timely interest or principal payments to bondholders.
Discount	A bond trading below its face value on the secondary market (e.g., priced at $950 for a $1,000 par bond).
Face value (Par)	The principal amount the bond issuer agrees to repay to the investor at maturity (typically $1,000).
Investment grade	High-quality bonds rated BBB-/Baa3 or higher with low credit and default risk.
Junk (High-yield)	Bonds rated BB+/Ba1 or lower that carry higher credit risk in exchange for higher coupon yields.
Maturity date	The date on which the bond’s principal balance must be repaid in full.
Premium	A bond trading above its face value on the secondary market (e.g., priced at $1,050 for a $1,000 par bond).
Yield to maturity (YTM)	The total annualized return an investor can expect to earn if the bond is held until its maturity date.

Bond credit ratings

Independent credit rating agencies assess the financial strength of bond issuers and their ability to repay debt on schedule. The “Big Three” rating agencies are Standard & Poor’s (S&P), Moody’s and Fitch Ratings.⁽¹⁾

Bonds are divided into two main categories:

• Investment-grade bonds: Rated AAA to BBB- (S&P/Fitch) or Aaa to Baa3 (Moody’s). These bonds are issued by financially stable corporations and governments with low default probabilities.
• High-yield (Junk) bonds: Rated BB+ to D (S&P/Fitch) or Ba1 to C (Moody’s). These carry higher credit risk, but compensate investors with higher yields.

Where to find bond ratings

Investors can check issuer credit ratings through major financial databases, brokerages or rating agency websites:

1. Visit fitchratings.com or spglobal.com/ratings.
2. Search by the company or sovereign issuer name.
3. Review the credit rating, outlook (stable, positive, negative) and rating history.

Advantages of bonds

• Predictable income: Scheduled coupon payments provide reliable cash flow, making bonds popular for retirees and income-focused portfolios.
• Capital preservation: If held to maturity, solvent bond issuers return 100% of the original principal.
• Portfolio diversification: High-grade bonds generally exhibit lower volatility than stocks and often hold value during equity market downturns.
• Tax advantages: Municipal bonds provide federal tax exemption, while Treasuries are exempt from state and local taxes.

Risks and drawbacks of bonds

• Interest rate risk: When interest rates rise, bond market values decline if you need to sell before maturity.
• Default risk: Corporate or municipal issuers can experience insolvency and fail to meet coupon or principal obligations.
• Inflation risk: Fixed coupon payments lose real purchasing power if inflation outpaces the bond’s yield over long horizons.
• Call risk: Callable bonds may be redeemed early by the issuer if market rates fall, forcing you to reinvest at lower yields.
• Lower growth potential: Bonds historically deliver lower long-term capital growth compared to broad stock market indexes.

How to buy bonds

Investors can buy bonds through three main channels: online brokerages, bond funds or directly through the government.

1. Buy individual bonds through a broker

Accessing the secondary bond market via an online brokerage is one of the simplest ways to buy bonds:

1. Open an account with a broker that offers fixed-income trading, such as Public, Webull or Fidelity Investments.
2. Navigate to the broker’s fixed-income or bond screener.
3. Filter bonds by type (corporate, treasury, municipal), maturity date, credit rating and yield to maturity.
4. Place a buy order for your desired number of bonds (minimums are typically $1,000 par value per bond).

2. Invest in bond ETFs and mutual funds

Bond exchange-traded funds (ETFs) and mutual funds are the simplest way to gain diversified bond exposure without buying individual securities:

1. Open an account with a standard brokerage or robo-advisor.
2. Search for bond ETFs using ticker symbols (such as aggregate bond funds, short-term Treasury funds or corporate bond funds).
3. Purchase shares just like you would trade stocks, with no high minimum deposit requirements.

3. Buy directly through TreasuryDirect

You can purchase US Treasury bills, notes and bonds directly from the federal government with zero broker fees:⁽²⁾

1. Visit treasurydirect.gov and select Open an Account.
2. Complete the online application and link your checking or savings account.
3. Review the Treasury auction schedule for upcoming bills, notes or bonds.
4. Submit a non-competitive bid with a minimum investment of just $100.

Investor sentiment on bonds

Do you think it's a good time to invest in any of the following?

About a quarter (24%) of investors say now is a good time to invest in bonds, making it the 4th most popular option behind stocks, high interest savings accounts and real estate.

Bottom line

Bonds provide an effective vehicle for capital preservation and steady income, balancing the volatility of growth stocks in a well-rounded portfolio. While high-grade government and corporate bonds carry low default risk, investors must consider interest rate movements and inflation when locking funds into long-term maturities. See the best brokerage accounts if you want to add bonds to your portfolio.

Frequently asked questions

• What is a bond in simple terms?

  A bond is a fixed-income investment that represents a loan from an investor to a borrower—typically a corporation or government entity. The borrower pays regular interest (coupons) over the term of the bond and repays the original loan balance (face value) when the bond reaches maturity.

• How do bonds work?

  When an organization needs capital, it issues bonds with a set face value, maturity date and coupon interest rate. Investors purchase these bonds and receive scheduled interest payments until maturity, at which point the issuer returns the principal. Bonds can also be bought and sold on the secondary market prior to maturity.

• How do investors make money on bonds?

  Investors make money from bonds in two ways: through regular coupon interest payments paid throughout the bond's term, and through capital gains if a bond is purchased at a discount below its face value and held to maturity or sold at a premium.

• Can you lose money investing in bonds?

  Yes. You can lose money if the bond issuer defaults on interest or principal payments, or if you sell a bond on the secondary market before maturity after market interest rates have risen. While holding a bond to maturity guarantees the return of principal for solvent issuers, inflation can also erode purchasing power over long horizons.

• Are bonds safer than stocks?

  Generally, yes. Bonds sit higher in a company's capital structure than stocks, meaning bondholders must be paid before stockholders in bankruptcy. Bonds also provide predictable income with lower volatility than equities. However, bonds generally offer lower long-term potential returns compared to the stock market.