The Beginner's Guide to Bond Investing — How Fixed Income Works and Why It Matters

What Is a Bond?

A bond is an IOU. The borrower (the issuer) promises to pay the lender (the investor) regular interest and return the principal at a set maturity date.

Issuers: governments (Treasuries), municipalities (munis), corporations (corporate bonds) Investors: buy the bond, receive interest payments, get principal back at maturity

How bonds differ from stocks:

Stocks: ownership stake, variable dividends, no principal guarantee
Bonds: debt instrument, fixed interest payments, principal returned at maturity

Core Bond Concepts

Coupon (Interest Rate)

The annual interest rate promised at issuance. Example: $10,000 bond with a 3% coupon →$ 300 in interest per year

Maturity

The date when the principal is repaid.

Short-term: 1–3 years
Medium-term: 3–10 years
Long-term: 10+ years (20-, 30-year bonds)

Yield

The annualized return you’d earn if you held the bond to maturity, based on the current market price.

The critical relationship:

Interest rates rise → Bond prices fall → Yields rise
Interest rates fall → Bond prices rise → Yields fall

Bond prices and interest rates always move in opposite directions.

Why Bond Prices Move with Interest Rates

Here’s a concrete example:

You own a bond paying a 3% coupon, issued one year ago. Market interest rates have now risen to 5%.

→ Newly issued bonds pay 5%. → Nobody wants your 3% bond at face value. → You’d have to sell it at a discount. → Your bond’s market price falls.

The bottom line: when rates rise, existing bond prices fall.

Maturity and Interest Rate Sensitivity

The longer the maturity, the more sensitive the bond is to rate changes.

1-year bond: rates rise 1% → price falls ~1%
10-year bond: rates rise 1% → price falls ~8–9%
30-year bond: rates rise 1% → price falls ~20–25%

Long-term bonds can be as volatile as stocks.

The Role of Bonds: Portfolio Stabilization

The stock-bond negative correlation: during recessions, stocks fall → central banks cut rates → bond prices rise.

→ In a stock market crash, bonds act as a cushion.

This relationship isn’t guaranteed in every environment (2022 saw both stocks and bonds fall simultaneously), but over the long run it remains one of the most reliable diversification tools available.

Types of Bonds

Government Bonds (Treasuries)

Issued by the federal government. Considered the safest.

T-Bills: maturity under 1 year
T-Notes: 2–10 year maturity
T-Bonds: 10–30 year maturity
TIPS (Treasury Inflation-Protected Securities): principal adjusts with CPI inflation

Corporate Bonds

Issued by companies. Higher yield than Treasuries, but with default risk.

By credit rating:

Investment grade (BBB and above): lower yield, lower default risk
High yield / junk (BB and below): higher yield, meaningful default risk

Municipal Bonds (“Munis”)

Issued by state and local governments. Interest is typically exempt from federal income tax — attractive for investors in high tax brackets.

Bond ETFs: What You Need to Know

Buying individual bonds requires large minimums and considerable complexity. Bond ETFs make fixed income accessible to everyone.

Major US Bond ETFs

ETF	Description	Expense Ratio
BND	Total US bond market (Vanguard)	0.03%
AGG	iShares US Aggregate Bond	0.03%
TLT	iShares 20+ Year Treasury	0.15%
SGOV	iShares 0-3 Month Treasury	0.07%
SCHP	Schwab US TIPS	0.03%
LQD	iShares Investment Grade Corporate	0.14%

Stability, low volatility: SGOV, BND
Maximize gains when rates fall: TLT (long-duration)
Inflation protection: SCHP or TIPS

Strategy by Interest Rate Cycle

Rising Rate Environment (rates expected to go up)

Long-term bonds: reduce or avoid (price decline risk)
Short-term bonds, money market: increase allocation
Floating-rate bonds: advantaged

Falling Rate Environment (rates expected to come down)

Long-term bonds: increase allocation (price appreciation potential)
TLT and similar long-duration ETFs: favorable timing
Corporate bonds: tightening spreads benefit as economy recovers

Important: bond markets price in expected rate moves in advance. Bond prices often move before the Fed actually cuts rates.

Practical Bond Strategies

Bond Ladder

Hold bonds of evenly spaced maturities.

Example:

1-year bonds: 20%
3-year bonds: 20%
5-year bonds: 20%
10-year bonds: 20%
20-year bonds: 20%

→ Principal returns at regular intervals (maintains liquidity) + spreads interest rate risk across the curve

The 60/40 Portfolio

Classic allocation: 60% stocks + 40% bonds.

The bond 40% serves two functions:

Cushions stock drawdowns
Provides dry powder for rebalancing (sell bonds when stocks crash → buy stocks cheap)

Bonds in Tax-Advantaged Accounts (IRA, 401(k))

Holding bonds inside a traditional IRA or 401(k) shelters interest income from current taxes, making bond ETFs particularly efficient in those wrappers. Consider:

BND, AGG for broad market exposure
SCHP for inflation protection
Short-duration bond ETFs for capital preservation near retirement

Psychological stability: having something that holds up in a crash makes it easier to stay invested
Rebalancing fuel: sell bonds at the bottom of a stock crash → buy stocks cheap
Income in retirement: coupon payments supplement living expenses
Longevity protection: hold to maturity and principal is returned regardless of price swings

100% stocks may make sense when you’re young and have decades ahead. As you approach retirement, bonds increasingly protect what you’ve built.