What Is a Bond and Should You Own Them?
Bonds explained simply: what they are, how they work, why they belong in some portfolios and not others, and how to decide if you need them right now.
📚 Part of our Complete Investing Guide
Stocks get all the attention. But bonds — the quiet, unglamorous side of investing — have protected portfolios through every major crash of the last century.
The question is not whether bonds are useful. They are. The question is whether you, specifically, should own them right now.
This guide explains what bonds are, how they work, and gives you a straightforward framework for deciding if they belong in your portfolio.
What Is a Bond?
A bond is a loan you make to a borrower — typically a government or a corporation — in exchange for regular interest payments and the return of your principal at a set future date.
When you buy a bond:
- You lend a fixed amount (the face value or par value)
- The borrower pays you interest (called the coupon) at regular intervals
- At the end of the bond's term (the maturity date), you get your principal back
Example: You buy a 10-year US Treasury bond with a $1,000 face value and a 4% coupon. Every year, the US government pays you $40. After 10 years, you receive your $1,000 back.
Types of Bonds
Government bonds are issued by national governments. US Treasury bonds are considered the safest investment in the world — backed by the full faith and credit of the US government. They pay lower interest because the risk of default is essentially zero.
Municipal bonds are issued by state and local governments. They are often tax-exempt at the federal level, making them attractive to high-income investors in taxable accounts.
Corporate bonds are issued by companies. They pay higher interest than government bonds because companies can go bankrupt — the higher return compensates for that extra risk. Investment-grade corporate bonds are relatively safe; high-yield (junk) bonds carry significantly more risk.
International bonds are issued by foreign governments or companies. They add currency risk on top of credit risk.
How Bond Prices Work (The Part Most People Get Wrong)
Bond prices move inversely with interest rates. This trips up almost every new investor.
Here is why: Imagine you own a bond paying 3% interest. Now rates rise and new bonds pay 5%. Your 3% bond becomes less attractive — no one wants it at full price. Its market price falls until the yield is competitive with the new 5% bonds.
The reverse is also true: when rates fall, existing higher-yielding bonds become more valuable, and their prices rise.
This matters because if you buy bonds and then sell them before maturity, you might get more or less than you paid depending on where rates went.
Why Own Bonds?
Bonds serve three purposes in a portfolio:
1. Reduce volatility. Stocks can drop 30-50% in a crash. Bonds typically hold their value or increase as investors flee to safety. A portfolio with 60% stocks and 40% bonds will fall less sharply in a downturn — though it will also grow less in a bull market.
2. Provide income. Bonds generate predictable cash flows through coupon payments. This matters most for retirees who need steady income without selling stocks.
3. Portfolio rebalancing. When stocks crash, bonds often hold up well. Selling bonds to buy more stocks at low prices — rebalancing — is one of the few reliable ways to improve long-term returns.
Should You Own Bonds?
It depends almost entirely on your age, time horizon, and risk tolerance.
Under 40 with a long investment horizon: Probably not much. You have decades to ride out stock market crashes. The extra return from an all-stock portfolio is significant over 30+ years. A common guideline is to hold your age in bonds (e.g., 30% bonds at age 30), but many financial experts now consider this too conservative given longer lifespans and low bond yields historically.
10-20 years from a major goal: Start adding bonds gradually. A 10-20% bond allocation smooths out volatility as your timeline shortens.
5 years or less from retirement: Bonds become important. A 40-60% bond allocation protects against a crash wiping out your portfolio right before you need it.
In retirement: Most financial planners recommend 40-60% bonds for retirees, with the exact allocation depending on spending needs and Social Security income.
How to Buy Bonds
The easiest approach for most investors is a bond index fund — a single fund that holds thousands of bonds across maturities and issuers.
Popular options include BND (Vanguard Total Bond Market ETF, 0.03% expense ratio) and AGG (iShares Core US Aggregate Bond ETF, 0.03%). Both hold a mix of government and corporate bonds and trade like stocks on any brokerage.
You can also buy individual US Treasury bonds directly at TreasuryDirect.gov with no fees, in denominations as low as $100.
The Bottom Line
Bonds are not exciting. They will not make you rich. But they will keep you from panicking and selling your stocks at the bottom of a crash — and that alone is worth a lot.
If you are young and investing for retirement 30+ years away, keep bonds minimal. If you are within a decade of needing your money, start shifting toward bonds gradually. If you are retired, bonds are no longer optional — they are essential.
The Bogleheads' Guide to Investing by Taylor Larimore et al. — The definitive guide to building a simple, diversified portfolio. Has an excellent chapter on bonds and asset allocation that cuts through all the noise.
A Random Walk Down Wall Street by Burton Malkiel — A classic that covers bonds, stocks, and why simple index investing beats almost everything else. Updated regularly and still essential.
Prefer audiobooks? Both titles are available on Audible — try it free for 30 days and get your first audiobook included.
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