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Understanding Bonds: Yields, Duration, and Rate Sensitivity
Bonds are loans you make to governments or companies in exchange for interest. Here's how yields work, why bond prices move opposite to interest rates.
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Bonds are loans you make to governments or companies in exchange for interest. Here's how yields work, why bond prices move opposite to interest rates.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
Bonds are the most misunderstood asset class in personal finance. Most people know they should own "some bonds" but couldn't explain how they work, why prices fall when rates rise, or whether bonds even make sense in 2026. Here's the complete picture — no finance degree required.
A bond is a fixed-income security where you lend money to a government or corporation in exchange for regular interest payments (the coupon) and the return of your principal at a set maturity date. Bond prices move inversely to interest rates; when rates rise, bond prices fall, and vice versa. Bonds serve as portfolio ballast, providing income and reducing volatility compared to stocks. As of 2026, bonds are yielding 4-5% on short-term Treasuries — meaningful income for the first time in over a decade.
When you buy a bond, you're lending money to someone; a government, a city, or a corporation. They promise to pay you back on a specific date (the maturity date) and pay you interest along the way. That's it. You're the lender. They're the borrower. The bond is the IOU.
This is the fundamental difference between stocks and bonds. When you buy a stock, you own a piece of the company. When you buy a bond, you've made the company a loan. As a bondholder, you don't care if the company's profits double; you just want your interest payments and your money back at maturity. You're first in line if things go wrong, but you don't participate in the upside.
Every bond has three essential characteristics:
Not all bonds are created equal. The issuer determines the risk profile:
| Bond Type | Issuer | Risk Level | Tax Treatment | Typical Yield |
|---|
A bond is a loan you make to a government or corporation. You lend them money for a set period (maturity), they pay you regular interest (coupon), and return your principal at maturity. US Treasury bonds are backed by the federal government and considered among the safest investments in the world.
If you hold a bond paying 3% and new bonds are issued at 5%, no one would pay full price for your lower-yielding bond. Its price drops until its effective yield matches the new rate. The longer the bond's maturity, the more sensitive it is to rate changes — this sensitivity is called duration.
Individual bonds guarantee your principal back at maturity (if the issuer doesn't default). Bond funds never mature — they continuously buy and sell bonds, so your principal fluctuates with interest rates. For most investors, bond funds are simpler and more diversified. If you need a guaranteed amount on a specific date, individual bonds or CDs are better.
Try this workflow
Apply this concept with live balances, transactions, and portfolio data instead of static spreadsheets.
Graph: 6 outgoing / 9 incoming
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How Interest Rates Affect Stock and Bond Markets
| Treasury Bonds | US Government | Lowest (full faith & credit) | Exempt from state/local tax | 4.0 – 4.5% |
| Municipal Bonds | State/local governments | Low to moderate | Often federal tax-exempt | 3.0 – 4.0% |
| Corporate (Investment Grade) | Companies (BBB+ rated) | Moderate | Fully taxable | 4.5 – 5.5% |
| High-Yield (Junk) | Companies (below BBB) | Higher | Fully taxable | 6.0 – 9.0% |
This is the concept that trips up most beginners: when interest rates go up, bond prices go down. And when rates go down, bond prices go up. They always move in opposite directions.
Here's why. Imagine you own a bond paying 3%. Now the government issues new bonds paying 5%. Nobody wants your 3% bond anymore; not when they can get 5% on a new one. So your bond's price drops until its effective yield matches the new rates. The coupon payments don't change, but the market price adjusts.
This is exactly what happened in 2022-2023 when the Federal Reserve raised rates aggressively. Long-term bond funds like TLT (20+ year Treasuries) dropped over 40%; a historically brutal decline for an asset class people thought was "safe." The bonds were still safe in the sense that the government would pay them back at maturity, but if you needed to sell before maturity, you took a real loss.
Duration measures how sensitive a bond's price is to interest rate changes. It's expressed in years, and the rule of thumb is simple: if a bond has a duration of 7, a 1% rise in interest rates will cause the price to drop about 7%. A duration of 2 means only a 2% drop.
Longer-maturity bonds have higher duration, which is why they're more volatile. A 30-year Treasury reacts much more violently to rate changes than a 2-year note. If you're worried about rising rates, shorter-duration bonds are your friend. If you think rates are headed down, longer-duration bonds will give you a bigger price boost.
Credit rating agencies (Moody's, S&P, Fitch) grade bonds based on the issuer's ability to pay. The scale runs from AAA (highest quality, lowest risk) down to C or D (in default). The dividing line between investment-grade and junk is BBB-/Baa3.
A downgrade from investment-grade to junk (called a "fallen angel") can crater a bond's price because many institutional investors are required to sell anything rated below investment grade.
Most retail investors access bonds through funds (ETFs or mutual funds) rather than buying individual bonds. Both approaches have trade-offs:
For most people, bond funds are the practical choice. BND (Vanguard Total Bond Market) or AGG (iShares Core US Aggregate Bond) give you broad exposure with expense ratios under 0.05%. If you have a large enough portfolio and want guaranteed maturity dates, individual Treasuries bought through TreasuryDirect are a solid alternative.
For over a decade (roughly 2010-2021), bonds paid almost nothing. The 10-year Treasury yield hovered between 1-3%, and short-term bonds paid near 0%. Many investors abandoned bonds entirely; and honestly, it was hard to argue with them.
That era is over. After the Fed's rate-hiking cycle, yields are meaningfully higher. As of early 2026, you can earn 4-5% on short-term Treasuries with zero credit risk. High-quality corporate bonds yield even more. For the first time in a generation, bonds are actually providing real income.
This changes the calculus. Bonds are no longer dead weight in your portfolio; they're a genuine income-producing asset that also provides downside protection if stocks sell off.
The traditional advice is a 60% stock / 40% bond portfolio. In 2022, this portfolio had its worst year in decades because both stocks and bonds fell simultaneously; something the model assumes won't happen. For a deeper look at how to balance stocks, bonds, and other assets, our asset allocation guide covers the full framework.
Is 60/40 dead? Not exactly. The 2022 experience was unusual; driven by inflation and rapid rate hikes affecting both asset classes. Historically, bonds do provide a counterbalance to stocks during most downturns and recessions. The bigger question is whether 40% bonds is right for you, given your age, risk tolerance, and time horizon.
Younger investors with decades until retirement might hold 10-20% bonds. Investors within 10 years of retirement might want 30-40%. Retirees drawing income often hold 40-60%. There's no universal answer; it depends on when you need the money.
Regular bonds have an enemy: inflation. If you're earning 4% on a bond but inflation is 5%, you're losing purchasing power. Two Treasury products address this:
Both are excellent tools for preserving purchasing power, especially in uncertain inflation environments.
The right time to add bonds depends on your situation, not the market:
If you don't own any bonds, start by understanding what a reasonable allocation looks like for your age and goals. A common starting point: subtract your age from 110 or 120 — that's your stock percentage, and the rest goes to bonds. It's a rough heuristic, not a rule, but it gives you a baseline.
If you already own bonds, in a 401(k), an IRA, or a brokerage account, connect those accounts to Clarity to see your actual stock/bond allocation across everything. You might discover your 401(k) target-date fund already holds more bonds than you realized, or that you're underexposed. Knowing your real numbers is the first step to making intentional decisions. For more on bond basics, visit Investopedia's bond guide or explore TreasuryDirect for buying government bonds directly.
This article is educational and does not constitute investment advice. Past performance does not guarantee future results. Consider consulting a financial advisor before making investment decisions.
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