Bond Market Basics: Understanding Yield, Duration, and Price Movements
The bond market is bigger than the stock market. $50 trillion vs $40 trillion. But most investors ignore it until something breaks.
March 2023. Silicon Valley Bank. Bonds crashed. Bank failed.
August 2024. The carry trade unwind. Bond volatility spiked.
April 2026. The 10-year Treasury yield sits at 4.2 percent. The bond market is calm again.
Here is what you need to know about bonds, why they matter, and how they work.
PART ONE: The $50 Trillion Question
Why Bonds Matter Even If You Don't Own Them
Bonds set the price of money. When bond yields go up, borrowing gets more expensive. Mortgages, car loans, credit cards. When bond yields go down, money gets cheaper.
Stocks are priced relative to bonds. When bonds yield 5 percent, stocks look expensive. When bonds yield 2 percent, stocks look cheap.
You cannot understand stocks without understanding bonds.
"The bond market is the most important market in the world. It dictates the cost of capital for everything else."
PART TWO: The Inverse Relationship
Rule Number One (Non-Negotiable)
Why This Happens
You buy a bond for $1,000. It pays 4 percent interest ($40 per year).
New bonds are issued at 5 percent ($50 per year).
Why would anyone buy your 4 percent bond? They would not. Unless you sell it for less than $1,000.
The discount makes your 4 percent bond competitive with new 5 percent bonds.
Same logic in reverse. If new bonds pay 3 percent, your 4 percent bond becomes more valuable. You can sell it for more than $1,000.
In 2020, the 10-year Treasury yielded 0.5 percent. A bond bought at $1,000 paid $5 per year. By 2023, yields hit 5 percent. That same bond was worth roughly $500. A 50 percent loss on a "safe" government bond.
PART THREE: Bond Math in Plain English
Three Things You Need to Know
The Simple Formula
Example A:
- Coupon: $40 per year
- Price: $1,000 (face value)
- Yield: 40 ÷ 1000 = 4 percent
Example B (Rates Up):
- Coupon: $40 per year
- Price: $800 (discount)
- Yield: 40 ÷ 800 = 5 percent
Example C (Rates Down):
- Coupon: $40 per year
- Price: $1,200 (premium)
- Yield: 40 ÷ 1200 = 3.3 percent
PART FOUR: Duration (The Risk Number You Must Know)
What Duration Actually Means
Duration is not time to maturity. It is interest rate sensitivity.
Duration × Interest Rate Change = Price Change
The Duration Rule
If a bond has a duration of 5 years:
- Rates go up 1 percent → Bond price drops 5 percent
- Rates go down 1 percent → Bond price rises 5 percent
If a bond has a duration of 15 years:
- Rates go up 1 percent → Bond price drops 15 percent
- Rates go down 1 percent → Bond price rises 15 percent
Duration Examples
| Bond Type | Typical Duration | Rate +1% Impact | Rate -1% Impact |
|---|---|---|---|
| 1-year Treasury | 1 year | -1% | +1% |
| 5-year Treasury | 4.8 years | -4.8% | +4.8% |
| 10-year Treasury | 8.9 years | -8.9% | +8.9% |
| 30-year Treasury | 22.5 years | -22.5% | +22.5% |
| Long term corporate | 12 to 18 years | -12% to -18% | +12% to +18% |
SVB held long term bonds with 15+ year duration. Rates rose 4 percent in 2022. Their bond portfolio dropped 60 percent. The bank failed. Long duration = high risk. Know your duration.
PART FIVE: The Yield Curve
What It Looks Like (Normal)
What It Looks Like (Inverted)
What the Yield Curve Tells You
| Curve Shape | What It Signals | Historical Outcome |
|---|---|---|
| Normal (upward sloping) | Growth expected | Economy expanding |
| Flat | Transition | Uncertainty |
| Inverted (downward sloping) | Recession likely | Recession followed 75% of the time |
| Steep (very upward) | Strong growth or inflation concerns | Mixed |
Current status (April 2026): The curve is normal. 10-year at 4.3%, 2-year at 4.1%. No inversion. No recession signal from the curve.
PART SIX: Types of Bonds
The Risk Spectrum
Detailed Breakdown
| Bond Type | Issuer | Risk Level | Typical Yield | Tax Treatment |
|---|---|---|---|---|
| Treasury | US Government | Lowest | 4.0-4.5% | Federal taxable |
| Agency | Fannie, Freddie | Low | 4.2-4.8% | Federal taxable |
| Municipal | State, local gov | Low to Moderate | 3.0-4.0% | Often tax free |
| Corporate (Investment Grade) | Large companies | Moderate | 4.5-5.5% | Fully taxable |
| Corporate (High Yield/Junk) | Riskier companies | High | 6.0-9.0% | Fully taxable |
PART SEVEN: How to Invest in Bonds
The Simple Path (ETF)
| Goal | ETF Ticker | Description | Duration | Yield |
|---|---|---|---|---|
| Short term safety | SHV | 0-1 year Treasuries | 0.3 years | 4.0% |
| Core bond holding | BND | Total US bond market | 6.2 years | 4.4% |
| Intermediate Treasury | IEF | 7-10 year Treasuries | 8.1 years | 4.2% |
| Corporate bonds | LQD | Investment grade corporates | 8.5 years | 5.1% |
| High yield | HYG | Junk bonds | 4.2 years | 7.2% |
| Tax free munis | MUB | Municipal bonds | 5.5 years | 3.3% |
The Simple Rule for Duration
Match your bond duration to your investment time horizon. Need the money in 2 years? Buy bonds with 2 years duration or less. Investing for 10 years? Longer duration is fine.
PART EIGHT: Current Bond Market (April 2026)
Where Yields Stand
| Maturity | Yield | Month Change | Year Change |
|---|---|---|---|
| 3 month | 4.0% | -0.10% | -1.20% |
| 2 year | 4.1% | -0.15% | -0.80% |
| 5 year | 4.2% | -0.20% | -0.40% |
| 10 year | 4.3% | -0.25% | +0.10% |
| 30 year | 4.5% | -0.30% | +0.30% |
What It Means
The curve is normal. Short term yields have fallen as the Fed paused. Long term yields remain elevated on deficit concerns.
The bond market expects:
- Two rate cuts in late 2026
- No recession in the near term
- Persistent inflation above 2 percent
Current bond yields are attractive by historical standards. The 10-year Treasury yield of 4.3 percent is above its 50-year average of 4.2 percent. This is not 1980 (15% yields). But it is not 2020 (0.5% yields) either.
QUICK REFERENCE CARD
- Match duration to your time horizon
- Use bond ETFs for diversification
- Check the yield curve before buying
- Consider munis if you pay high taxes
- Buy long duration bonds for short term needs
- Ignore interest rate risk
- Chase high yield without understanding risk
- Sell bonds in panic during rate hikes
GLOSSARY
| Term | Definition |
|---|---|
| Coupon | The fixed interest payment printed on the bond |
| Yield | Your actual return based on the price you paid |
| Duration | Interest rate sensitivity (not time to maturity) |
| Yield Curve | Relationship between yields and maturities |
| Inversion | Short term yields higher than long term yields |
| Spread | Difference between corporate and Treasury yields |
Start Simple
Buy a total bond market ETF like BND. Duration is 6 years. Yield is 4.4 percent. Own thousands of bonds with one ticker. Add more complexity as you learn.