An overview of bonds, valuation principles, and their strategic use in institutional investing and diversification.
What is a Bond?
A bond is a loan contract where an investor is the lender, and a company or government is the borrower.
Purpose: Entities frequently issue bonds to raise capital for new projects.
How It Works (Example)
Issuance: A local government issues a bond with a $1M face value.
Income: The investor receives fixed annual interest payments, determined by the coupon rate, for the length of the bond.
Repayment: Once the bond reaches maturity, the investor redeems it and receives their $1M principal investment back.
The Role of Bonds in a Portfolio
Primary Benefits: Capital preservation and income generation.
Predictability: Unlike stocks—where profits depend on unpredictable market dynamics—bond returns are fixed and contracted in advance.
Diversification: Because bonds often move differently than stocks, they help stabilize and protect overall portfolio returns.
Key Risks
Default Risk: The chance the issuer fails to pay back the loan.
Higher default risk requires a higher yield (yield is different from coupon rate, see below).
Corporate bonds (riskier) usually offer higher coupon rates than safer government bonds.
Credit rating agencies (Moody’s, S&P, Fitch) assess and grade this financial stability.
Interest Rate Risk: If general market interest rates go up, existing bonds with lower rates become less attractive. This causes the bond’s resale price to drop if the investor needs to sell it before the maturity date.
Referneces
Investing Basics: Bonds Charles Schwab https://www.schwab.com/learn/story/investing-basics-bonds
Coupon Rate vs Yield
The coupon rate is fixed by the contract, while the yield is dynamic and driven by the market.
Coupon Rate
What it is: The fixed annual interest rate written into the bond’s original contract.
What it determines: The actual dollar amount the issuer pays you every year.
Does it change? No. It remains exactly the same for the entire life of the bond.
Example: If a bond has a $1,000 face value and a 5% coupon rate, it will pay you $50 every single year, regardless of what happens in the economy.
Yield
What it is: The total expected annual return on the bond if you were to buy it today at its current market price and hold it until maturity (often called Yield to Maturity, or YTM).
What it determines: Your actual profitability, factoring in the bond’s current resale price.
Does it change? Yes. Yield fluctuates continuously every time the bond’s market price changes.
Example: If that same $1,000 bond (paying $50 a year) is currently selling on the market at a discount for $900, your yield will be higher than 5% because you are making the $50 a year plus the $100 profit you get when the bond matures and pays back the full $1,000 face value.
What Are Bonds?
At its core, a bond is a fixed-income security that pays the investor a fixed or variable amount over time. When you buy a bond, you are essentially lending money to the issuer (a government, municipality, or corporation) in exchange for periodic interest payments (coupons) and the return of the principal amount at maturity.
There are many different types of bonds, including:
Treasuries, Notes, and Bills: Government-issued debt, typically considered the safest.
Corporate Bonds: Debt issued by companies, offering higher yields to compensate for higher default risk. Some are highly liquid, while others (especially private or exotic corporate bonds) can be very illiquid.
Mortgage-Backed Securities: Bonds backed by real estate loans, which introduce complexities like prepayment risk.
Valuation and Risk Factors
The theoretical value of a bond is calculated as the expected value of all its discounted future cash flows. However, this seemingly straightforward calculation involves several complex modeling challenges:
Discount Curves: To properly discount future cash flows, analysts must model the term structure of interest rates to build an accurate discount curve.
Credit Risk: The probability of the issuer defaulting must be factored in. This is often handled by adding a “spread” to the discount rate or explicitly modeling default probabilities.
Liquidity Risk: Some bonds trade infrequently. This lack of liquidity means the bond may trade at a discount, offering an illiquidity premium to investors who are willing to hold it.
Strategic Role in Portfolios
Bonds play a critical role in both individual and institutional portfolios:
Income Generation: For institutions like insurance companies, bonds provide a stable, predictable stream of cash flows that perfectly align with their long-term liability structures.
Illiquidity Premium: Institutional investors with stable funding structures can capitalize on illiquid corporate bonds, earning higher returns without facing the immediate pressure to liquidate.
Diversification: Historically, bonds have exhibited a lower correlation with equities. During periods of market volatility or economic downturns, high-quality bonds act as a classic diversifier, mitigating the overall risk of the portfolio.