What Is a Bond?

# What Is a Bond?

Research. Education. Perspective.

Difficulty: Foundation Reading time: 15 minutes Last reviewed: August 10, 2026

> Educational Resource > > This article explains bonds as debt securities. It does not recommend any issuer, bond, bond fund, maturity, credit rating, yield level or fixed-income allocation.

Executive Summary

A bond is a debt security.

Investor.gov describes a bond as similar to an IOU: an issuer borrows money from investors for a period of time and promises payments according to the bond's terms.[1][2]

The economic relationship is fundamentally different from owning stock.

A stockholder generally owns an equity interest in a corporation.

A bondholder generally owns a creditor claim against an issuer.

That issuer might be:

• A corporation
• The U.S. Treasury
• A state or local government
• A government-related entity
• Another organization able to issue debt securities

A typical bond has several important terms:

• Face value or par value: the principal amount associated with the bond
• Coupon: the stated interest payment
• Maturity: the date principal is scheduled to be repaid
• Market price: what buyers and sellers currently agree the bond is worth
• Yield: a measure relating the bond's cash flows to the price paid

These terms are related, but they are not interchangeable.

A bond can have a fixed coupon while its market price changes every day.

A bond can be purchased at a discount or premium to face value.

And a bond that appears to offer a high yield can carry substantial credit, interest-rate, liquidity or structural risk.

Key Takeaways

• A bond is a debt security representing money lent to an issuer.[1][2]
• Bondholders are creditors, not owners of the issuer.
• Bonds commonly specify principal, interest terms and a maturity date.
• Coupon rate, yield and total return are different concepts.
• Fixed-rate bond prices generally move inversely to market interest rates, all else equal.[4]
• Selling a bond before maturity can produce a price above or below par.[5]
• Default can cause substantial or total investment loss.[8]
• Credit ratings focus on credit risk and do not measure every bond risk.[6]
• Bond liquidity varies considerably.[9]
• A bond fund is a pooled vehicle holding debt securities; it should not be assumed to behave like one individual bond held to maturity.

What Does Owning a Bond Mean?

When an investor buys a newly issued bond, the investor generally lends capital to the issuer.

The issuer promises to repay according to contractual terms.

For a conventional bond, those terms can include:

• The amount borrowed
• The interest rate
• Payment dates
• Maturity date
• Seniority
• Collateral, if any
• Call or redemption provisions
• Covenants or other protections

The bond itself is the tradable security representing that debt claim.

> Rockwell Forbes Definition > > A bond is a security representing a creditor's contractual claim on an issuer for specified payments, subject to the issuer's ability to perform and the bond's legal terms.

Bondholder vs. Stockholder

The distinction between debt and equity is foundational.

| Bondholder | Stockholder | |---|---| | Generally a creditor | Generally an owner | | Holds a contractual debt claim | Holds an equity claim | | Payments governed by bond terms | Dividends generally discretionary | | Usually has a maturity date | Common stock normally has no maturity | | Generally ranks ahead of common equity in liquidation | Common equity is generally residual | | Upside typically more bounded | Can participate more fully in business upside | | Exposed directly to issuer credit risk | Exposed to residual business value |

Higher priority does not mean guaranteed repayment.

If an issuer cannot satisfy its obligations, creditors can still suffer losses.

Why Issuers Sell Bonds

Issuers use bonds to borrow capital.

A corporation might issue debt to finance:

• Capital expenditures
• Acquisitions
• Working capital
• Refinancing
• Expansion
• Other corporate purposes

Governments can issue bonds to finance public expenditures and projects.

Issuing bonds allows an organization to raise capital without issuing additional common equity.

But debt creates contractual obligations that equity generally does not.

Core Bond Terms

Face value or par value

The face value is the principal amount associated with the bond.

A common institutional denomination is $1,000, although structures differ.

If a bond with $1,000 face value is repaid in full at maturity, the issuer returns $1,000 of principal.

That repayment depends on the issuer's ability and obligation to pay.

Coupon

The coupon describes the bond's interest payment terms.

Investor.gov's glossary describes a coupon as a bond feature specifying the amount of interest due and the payment date.

A $1,000 bond with a 5% annual coupon would conventionally provide $50 of annual coupon interest if its terms remain in force.

Maturity

Maturity is the date on which the bond's principal is scheduled to become due.

A bond might mature in:

• Months
• Several years
• Decades

Maturity affects both cash-flow timing and exposure to changing interest rates.

Market price

Once issued, a bond may trade above, below or at face value.

• At par: market price approximately equals face value
• At a premium: market price exceeds face value
• At a discount: market price is below face value

The market price can change even if the coupon payment never changes.

Coupon Rate Is Not Yield

This is one of the most important bond concepts.

Suppose a bond has:

• Face value: $1,000
• Annual coupon: $50
• Coupon rate: 5%

If the bond trades at exactly $1,000, its annual coupon is 5% of the purchase price.

But suppose the same bond later trades at $900.

The $50 coupon did not change.

The relationship between that coupon and the current market price did.

This is why coupon rate and yield are not the same thing.

Current Yield

A simplified current-yield calculation is:

Annual coupon payment ÷ current market price

Using the prior example:

$50 ÷ $900 ≈ 5.56%

The coupon rate is still 5% of face value.

The current yield is about 5.56% of the $900 market price.

Current yield is useful, but it is incomplete because it does not fully account for:

• Time to maturity
• Gain or loss between purchase price and par
• Reinvestment
• Default
• Call features
• Fees

Yield to Maturity

Yield to maturity, or YTM, is a more comprehensive calculation.

Investor.gov explains YTM as a measure of what an investor's money would earn if the bond were held until maturity under the calculation's assumptions.[4]

YTM incorporates factors such as:

• Current price
• Coupon payments
• Time until maturity
• Principal repayment

It is still not a guaranteed realized return.

Actual outcomes can differ because:

• The issuer can default.
• A callable bond can be redeemed early.
• Coupons may be reinvested at different rates.
• The investor may sell before maturity.
• Fees and taxes can affect the result.

Yield is an analytical measure.

It is not an insurance policy.

Why Bond Prices Move

A bond's contractual cash flows can remain unchanged while its market value changes.

One major reason is changing market interest rates.

Suppose an existing bond pays a fixed 4% coupon.

Later, comparable newly issued bonds offer 6%.

A buyer has less incentive to pay full face value for the older 4% bond.

The older bond's market price will generally need to fall for its effective yield to become more competitive.

Now reverse the situation.

If comparable new bonds offer only 2%, the existing 4% bond may become more attractive and trade at a premium.

This creates the core relationship:

> For fixed-rate bonds, market prices generally move in the opposite direction from market interest rates, all else equal.[4]

Interest-Rate Risk

Interest-rate risk is the risk that changes in market rates alter the value of a bond.

FINRA and the SEC both identify interest-rate risk as a major bond risk.[4][7]

Two broad features matter:

Maturity

Longer-maturity fixed-rate bonds generally have greater sensitivity to rate changes than otherwise similar shorter-maturity bonds.

Coupon

Lower-coupon bonds generally have greater price sensitivity than otherwise similar higher-coupon bonds with the same maturity.

Professional fixed-income analysis often uses duration to estimate sensitivity to changes in yields.

Duration is more advanced than maturity alone because it incorporates the timing of cash flows.

Selling Before Maturity

Investor.gov emphasizes that an investor selling a bond before maturity may receive an amount very different from face value.[5]

If rates have risen, the bond may need to be sold below par.

If rates have fallen, it may trade above par.

Credit changes can also affect price.

A bond originally purchased at $1,000 might later trade at:

• $1,050
• $980
• $800
• A much lower value after severe credit deterioration

The contractual face value does not fix the secondary-market sale price.

"Hold to Maturity" Does Not Eliminate Every Risk

It is sometimes said that price changes do not matter if a bond is held to maturity.

That statement is incomplete.

Holding a bond to maturity may reduce the significance of interim market-price changes if the issuer makes all required payments.

But risks can remain:

• Default
• Restructuring
• Inflation
• Call risk
• Reinvestment risk
• Opportunity cost
• Liquidity needs before maturity

The key phrase is:

assuming the issuer performs according to the bond terms.

A maturity date does not guarantee solvency.

Credit Risk

Credit risk is the possibility that the issuer cannot make promised payments.

FINRA identifies issuer default as one of the primary risks of bond investing.[8]

Credit outcomes can range from:

• Full and timely payment
• Payment delay
• Restructuring
• Reduced recovery
• Default with substantial loss

Credit analysis therefore asks whether the borrower's financial resources are sufficient to service the debt.

For a company, relevant factors can include:

• Revenue stability
• Cash flow
• Leverage
• Interest expense
• Asset coverage
• Industry conditions
• Refinancing needs
• Debt maturity schedule

A bond's contractual promise is only as strong as the issuer's ability and willingness to fulfill it.

Credit Ratings

Credit-rating agencies publish opinions about creditworthiness.

Ratings can help organize credit-risk information.

But the SEC cautions that credit ratings address credit risk, not other risks such as liquidity, interest-rate or market risk.[6]

This limitation is essential.

A highly rated bond can still:

• Fall in price when rates rise
• Lose purchasing power to inflation
• Become less liquid
• Underperform another investment

A rating is one input.

It is not a complete investment analysis.

Investment Grade and High Yield

Bond markets commonly distinguish between investment-grade and below-investment-grade, or high-yield, debt.

Investment-grade securities generally carry higher credit ratings and lower expected default risk than below-investment-grade securities.

High-yield bonds generally offer higher yields partly because investors demand greater compensation for credit risk and other uncertainties.

The additional yield is not free return.

It can reflect:

• Higher default probability
• Lower recovery expectations
• Greater volatility
• Lower liquidity
• More cyclical issuers

Higher yield should therefore lead to the question:

What risk is the market asking investors to accept?

Inflation Risk

Bonds can make payments exactly as promised and still lose purchasing power.

Suppose a fixed-rate bond provides a 3% nominal return during a period in which the price level rises 5%.

The nominal dollars increased.

Their purchasing power did not keep pace.

This is inflation risk.

Inflation is particularly relevant to long-duration fixed nominal payments because the real value of future cash flows depends on the purchasing power of money at that time.

Reinvestment Risk

Coupon payments create another uncertainty.

When a bond pays interest, the investor must decide what to do with the cash.

If market rates have fallen, future reinvestment may occur at lower yields.

This is reinvestment risk.

The same issue can arise when:

• A bond matures
• A bond is called early
• Principal is prepaid

The original bond's yield therefore does not determine what future cash distributions will earn after they are received.

Call Risk

Some bonds give the issuer the right to redeem them before scheduled maturity.

This is known as a call feature.

An issuer may be more likely to call certain bonds when market rates fall because new debt can potentially be issued at lower rates.

For the investor, that can mean:

• Principal is returned earlier than expected.
• High-coupon payments stop.
• Replacement investments may offer lower yields.

The precise consequences depend on the bond's terms.

Call provisions should therefore be understood before assuming a bond will remain outstanding until its stated maturity.

Liquidity Risk

Bonds vary widely in how frequently they trade.

FINRA notes that decreased liquidity can create losses for investors who need to sell before maturity.[9]

A liquid bond market has:

• Active buyers and sellers
• Competitive quotations
• Reasonable market depth
• Lower transaction friction

An illiquid bond may require:

• More time to sell
• A wider bid-ask spread
• A price concession
• Dealer negotiation

A bond can have a face value of $1,000 without an immediate buyer willing to pay $1,000.

Face value is not the same as current liquidity.

Different Types of Bonds

U.S. Treasury securities

Debt issued by the U.S. Treasury.

Treasury securities have different maturities and structures.

Their credit characteristics differ from corporate or municipal debt, but they remain exposed to market and inflation risks.

Corporate bonds

Debt issued by companies.

Corporate bond analysis focuses heavily on:

• Creditworthiness
• Leverage
• Cash flow
• Seniority
• Covenants
• Maturity
• Liquidity

Municipal bonds

Debt issued by states, cities and other public entities.

Municipal bonds can have specialized credit and tax characteristics.

Tax treatment depends on the security and the investor's circumstances.

Agency and government-related debt

Certain government-sponsored or government-related entities issue debt.

Investors should not assume every such security has the same explicit federal guarantee as U.S. Treasury obligations.

Asset-backed and mortgage-related securities

Some bonds are supported by pools of loans or financial assets.

Their cash flows can be affected by:

• Borrower payments
• Prepayments
• Defaults
• Structure
• Interest rates

These securities can be more complex than a simple corporate bond.

Zero-Coupon Bonds

Not every bond makes periodic coupon payments.

Investor.gov describes zero-coupon bonds as bonds that generally do not make interest payments during their life. Instead, they are purchased at a discount and pay face value at maturity.

For example:

• Purchase price: $800
• Face value at maturity: $1,000

The economic return comes from the difference, assuming payment is made as promised.

Zero-coupon bonds can be especially sensitive to interest-rate changes because their cash flow is concentrated at maturity.

Bond Price and Yield Move in Opposite Directions

FINRA summarizes one of the most important fixed-income relationships:

As a bond's price rises, its yield falls; as its price falls, its yield rises.[10]

Consider a fixed $50 annual coupon.

If the bond costs:

• $1,000, that cash payment is 5% of price.
• $900, that same $50 is about 5.56% of price.
• $1,100, that same $50 is about 4.55% of price.

The coupon did not change.

The market price changed.

Therefore the yield relative to price changed.

Total Return

A bond's total return can include:

• Coupon income
• Interest-on-interest from reinvestment
• Price appreciation or depreciation
• Principal repayment
• Default losses
• Fees

This makes total return different from:

• Coupon rate
• Current yield
• Yield to maturity

A bond can have a positive coupon while producing a negative total return over a particular holding period if its market value falls enough.

Individual Bonds vs. Bond Funds

A bond fund is not simply one very large bond.

Investor.gov describes bond funds as investment companies that invest primarily in bonds or other debt securities.

Individual bond

Typically has:

• One issuer
• A stated face value
• Contractual terms
• A maturity date

Bond fund

Typically has:

• Many underlying bonds
• Ongoing portfolio purchases and sales
• A fund share price
• Management fees and expenses
• No single maturity date for the investor in most ordinary open-end structures

This distinction matters when investors hear phrases such as "hold to maturity."

An individual bond can mature.

An ordinary bond fund continually owns a changing portfolio of bonds and generally does not promise the investor repayment of a specified face value on one date.

Bond Funds Still Have Interest-Rate Risk

Owning bonds through a fund does not remove the interest-rate relationship.

If the value of bonds inside the fund falls because market yields rise, the fund's net asset value can decline.

A fund can later purchase newer bonds with higher yields, which may improve future income.

But the initial price decline is still economically real.

This is one reason a bond fund's current distribution yield should not be confused with guaranteed total return.

Bonds and Diversification

Bonds can provide economic exposures different from stocks.

That can make them useful to study within a diversified portfolio framework.

But "bond" is an extremely broad category.

A short-term Treasury security and a deeply subordinated high-yield corporate bond are both debt securities.

Their risks can be very different.

Diversification within fixed income can include differences in:

• Issuer
• Credit quality
• Maturity
• Geography
• Sector
• Security structure

Owning many bonds does not eliminate broad interest-rate, credit or inflation risk.

Bond Due Diligence

FINRA emphasizes due diligence when evaluating bonds and specifically identifies issuer default as a key risk.[8]

A foundational bond review can ask:

1. Who is the issuer?
2. What is the issuer borrowing for?
3. What is the face value?
4. What is the coupon structure?
5. When does the bond mature?
6. Is the bond callable?
7. Where does the bond rank in the capital structure?
8. Is it secured by collateral?
9. What is the issuer's credit condition?
10. What is the current market price and yield?
11. How sensitive is it to interest rates?
12. How liquid is the bond?
13. What could cause default or restructuring?

This framework does not produce an investment recommendation.

It makes the creditor claim easier to understand.

Common Misconceptions

"Bonds cannot lose money."

False. Bonds can lose value because of default, rising interest rates, inflation, liquidity problems and other risks.[7][8]

"The coupon is my guaranteed return."

No. Coupon describes contractual interest. Total return also depends on price, repayment, reinvestment, default and holding period.

"If I hold a bond to maturity, I cannot lose."

Not necessarily. If the issuer defaults or restructures, repayment can be reduced or delayed.

"A higher-yielding bond is automatically better."

No. Higher yield can reflect greater credit, liquidity, duration or structural risk.

"A high credit rating means low investment risk in every respect."

No. The SEC notes that ratings primarily address credit risk and do not cover all market, interest-rate or liquidity risks.[6]

"Bond funds and individual bonds work the same way."

No. A bond fund is a pooled vehicle with a portfolio and share price; most do not have one maturity date at which an investor receives a specified face value.

"All bonds are safer than all stocks."

No. Risk varies enormously within both categories.

Frequently Asked Questions

What is a bond in simple terms?

A bond is a debt security. Buying one generally means lending money to an issuer in exchange for promised payments under stated terms.[1][2]

What is a bond coupon?

The coupon describes the bond's interest payment terms.

What is face value?

Face value, or par value, is the principal amount associated with the bond and generally scheduled for repayment at maturity, assuming the issuer performs.

What is maturity?

Maturity is the date on which the principal becomes due under the bond terms.

Why do bond prices fall when interest rates rise?

Existing lower-rate fixed bonds become less attractive compared with newly issued bonds offering higher rates, so their market prices generally fall until yields become more competitive.[4]

Can a bond be sold before maturity?

Generally yes if a market exists, but Investor.gov notes that the sale price may be above or below face value.[5]

What is credit risk?

Credit risk is the possibility that the issuer cannot make required interest or principal payments.

What does a credit rating tell investors?

It is an opinion about creditworthiness. The SEC cautions that ratings do not cover all risks, including liquidity and interest-rate risk.[6]

Is a bond fund the same as holding bonds to maturity?

No. A bond fund owns a changing portfolio of debt securities and generally has no single maturity date for the investor.

Can bondholders lose their entire investment?

Yes. Severe default or restructuring can cause substantial or potentially total loss, depending on the security and recovery.

The Bottom Line

A bond is a loan packaged as a security.

The issuer receives capital.

The bondholder receives a contractual creditor claim.

That claim can include:

• Coupon payments
• Principal repayment
• A maturity date
• Seniority
• Other legal terms

But contractual does not mean risk-free.

Bond investors face:

• Credit risk
• Interest-rate risk
• Inflation risk
• Liquidity risk
• Call risk
• Reinvestment risk
• Structural risk

The most important conceptual distinction is this:

A bond's promised cash flows and its market value are not the same thing.

A bond can continue paying the same coupon while its market price changes substantially.

A high yield can be attractive in appearance while signaling higher risk.

A maturity date can establish when principal is due without guaranteeing that the issuer will have the resources to pay it.

The useful question is therefore not simply:

"What does this bond yield?"

It is:

"What contractual claim am I buying, what risks support that yield, and what could prevent the promised economic outcome from being realized?"

Continue Your Learning

1. Stocks vs. Bonds — Compare creditor claims with equity ownership.
2. What Is a Stock? — Understand the ownership side of the capital structure.
3. Risk vs. Return Explained — Learn how credit and interest-rate risk fit into the broader risk framework.
4. Asset Classes Explained — Place fixed income inside the wider investment universe.
5. Return — Understand income, price return and total return.
6. Inflation — Learn how fixed nominal payments can lose purchasing power.
7. Liquidity — Understand why some bonds can be difficult to sell.
8. Time Horizon — Learn why maturity and the timing of financial needs are different concepts.

Sources & References

1. [U.S. Securities and Exchange Commission — Investor.gov: Bonds — FAQs](https://www.investor.gov/introduction-investing/investing-basics/investment-products/bonds-or-fixed-income-products/bonds)
2. [U.S. Securities and Exchange Commission — Investor.gov: Bonds](https://www.investor.gov/introduction-investing/investing-basics/glossary/bonds)
3. [U.S. Securities and Exchange Commission — Investor.gov: Corporate Bonds](https://www.investor.gov/introduction-investing/investing-basics/investment-products/bonds-or-fixed-income-products)
4. [U.S. Securities and Exchange Commission — Investor.gov: When Interest Rates Go Up, Prices of Fixed-Rate Bonds Fall](https://www.investor.gov/introduction-investing/general-resources/news-alerts/alerts-bulletins/investor-bulletins-86)
5. [U.S. Securities and Exchange Commission — Investor.gov: Bonds, Selling Before Maturity](https://www.investor.gov/introduction-investing/investing-basics/glossary/bonds-selling-maturity)
6. [U.S. Securities and Exchange Commission: The ABCs of Credit Ratings](https://www.sec.gov/resources-for-investors/investor-alerts-bulletins/ib_creditratings)
7. [FINRA: Bonds](https://www.finra.org/investors/investing/investment-products/bonds)
8. [FINRA: Bond Investing and Due Diligence](https://www.finra.org/investors/insights/bond-investing-due-diligence)
9. [FINRA: Bond Liquidity—Factors to Consider and Questions to Ask](https://www.finra.org/investors/insights/bond-liquidity-factors-questions)
10. [FINRA: Understanding Bond Yield and Return](https://www.finra.org/investors/insights/bond-yield-return)

Educational Disclaimer

Rockwell Forbes publishes educational content intended to help readers better understand investing, bonds, fixed-income markets and related topics.

Nothing in this article should be interpreted as personalized investment, legal, tax or financial advice, or as a recommendation to buy, sell or hold any bond, bond fund, issuer, maturity, credit quality or fixed-income strategy.

Readers should evaluate their own circumstances and consult qualified professionals where appropriate.

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