Bonds vs. Stocks: The Two Building Blocks of Most Portfolios

Most investment portfolios are built from two basic pieces. Stocks represent ownership in a company. A bond is a debt security, similar to an IOU: borrowers issue bonds to raise money from investors willing to lend for a set period, as Investor.gov explains.

How does a stock make money?

When you buy a share of stock, you own a small piece of the company. Your return comes from the share price rising and, for some companies, from dividends. If the company struggles, the price can fall and you can lose money. Stocks offer higher long-term growth potential with bigger swings along the way.

How does a bond make money?

When you buy a bond, you are lending to the issuer, which may be a government, municipality or corporation. The issuer promises to pay a specified interest rate during the bond's life and to repay the principal (the face value) when the bond matures. Bonds are generally steadier than stocks, but they are not risk-free: the issuer could default, and bond prices fall when interest rates rise.

Why hold both?

Stocks and bonds often behave differently in the same economic weather, so combining them can smooth the ride. Younger investors with decades ahead typically hold more stock; as a goal approaches, the mix usually shifts toward bonds. That trade-off between growth potential and stability is the core decision in portfolio design.

Frequently asked questions

Can I buy bonds without picking individual ones? Yes. Bond mutual funds and ETFs hold many bonds at once, which spreads out the risk of any single issuer defaulting.

Are savings bonds the same as bond funds? No. U.S. savings bonds are government-issued and held directly, with the backing of the U.S. government. Bond funds hold marketable bonds whose prices move daily.

Sources and further reading: Investor.gov, "Bonds" (https://www.investor.gov/introduction-investing/investing-basics/glossary/bonds); Investor.gov, "Stocks" (https://www.investor.gov/introduction-investing/investing-basics/investment-products/stocks).