An individual bond is a loan to one issuer that pays interest and returns face value on a set maturity date. A bond fund pools many bonds into one portfolio, so you own shares of the fund, pay fees, and have no single maturity date. Each can lose value, and neither is insured by the FDIC.
You want fixed income in your portfolio, and your brokerage screen offers both a single Treasury or corporate bond and a bond ETF that holds hundreds. They look similar, but they behave differently when interest rates move or when you need your cash back on a particular date.
How does an individual bond work?
A bond is a debt security, like an IOU. According to Investor.gov, the SEC's investor education site, the issuer promises a specified rate of interest during the life of the bond and repays the principal, also called face or par value, at maturity.
The same page says that if you hold a bond to maturity you receive the face value plus interest. If you sell earlier, it may be worth more or less than face value. Rising rates make newly issued bonds more appealing, so to sell an older, lower-rate bond you might have to accept a discount.
How does a bond fund work?
A bond fund pools money from many investors and buys a portfolio of bonds. Investor.gov describes exchange-traded funds as products that invest in stocks, bonds or other securities, with a portfolio usually managed by an SEC-registered investment adviser, and each share represents part ownership of that portfolio and its income.
Fund holders can earn money in three ways, per Investor.gov: dividend payments from the portfolio's interest, capital gains distributions, and an increase in the fund's market price or net asset value.
What are the main differences?
The biggest practical differences are maturity, cost and diversification.
| Individual bond | Bond fund or ETF | |
|---|---|---|
| Maturity date | Yes, a fixed date | No single date; the portfolio keeps turning over |
| Principal back | Face value at maturity, if the issuer pays | Share price floats; no promise of a set value |
| Diversification | One issuer per bond | Many issuers in one holding |
| Costs | Dealer markup or spread when you buy or sell | Ongoing fund expenses deducted from net asset value |
| Minimum to start | Often a larger lump per bond | Often one share or a low dollar amount |
| Income | Fixed coupon | Varies as the portfolio changes |
Maturity and certainty
A single bond gives you a known end date, which suits a goal with a deadline, such as tuition due in four years. A fund has no end date, so its price on the day you sell is the outcome.
Diversification
One corporate bond carries the credit risk of one company. A fund spreads that across many issuers, though Investor.gov warns that some funds are less diverse than others and may hold fewer investments.
Costs
Investor.gov says funds pass costs to investors by deducting fees and expenses from net asset value, and that even small differences in fees can mean large differences in returns over time. Read what an expense ratio is and check it before you buy.
What risks do both share?
Both carry credit risk, interest rate risk, inflation risk and liquidity risk, according to Investor.gov. Credit risk means the issuer may fail to make payments. Interest rate risk means prices fall when rates rise. Inflation reduces the purchasing power of fixed interest. Liquidity risk means you may not find a buyer when you want to sell, which is explored in what liquidity risk is.
For funds, Investor.gov adds that ETFs and mutual funds are not guaranteed or insured by the FDIC or any government agency, and you may lose some or all of the money you invest. See also what FDIC insurance actually covers.
How do you decide between them?
Match the structure to the job, then verify the details yourself. This is education, not a recommendation.
- Do you need money on a specific date? A single bond or a Treasury ladder maps to dates more directly than a fund.
- Do you want broad credit exposure for a small amount? A fund can offer it, with fees.
- How much time will you spend monitoring? Individual bonds need issuer research. A fund delegates it.
- What are the total costs? Compare the bond's spread with the fund's expense ratio.
Frequently asked questions
Is a bond fund safer than a single bond?
Not necessarily. A fund spreads credit risk across many issuers, but its price still moves with interest rates and it has no maturity date that returns face value. Neither is insured by the FDIC.
Can you lose money in a bond fund?
Yes. Investor.gov states that funds are not guaranteed or insured and you may lose some or all of your investment, because the securities a fund holds can fall in value.
Do bonds always return your principal?
If you hold a bond to maturity and the issuer pays, you receive face value plus interest, according to Investor.gov. The issuer can default, and selling before maturity can produce a gain or a loss.
Are bond funds cheaper than buying bonds?
It depends. Funds charge ongoing expenses, while individual bonds usually involve a spread or markup when you buy or sell. Compare both before deciding.
Related: Treasury bills vs CDs vs money market funds · What is an index fund? · What is private credit?