Credit investing is the practice of lending money to a borrower, usually a government or a company, in exchange for scheduled interest payments and the return of your principal on a fixed date. When you buy a bond or a loan, you are the lender, not an owner, and you have a contractual right to be repaid before any shareholder receives anything. The interest rate, the payment schedule, and the repayment date are set at the outset, which is why credit instruments sit at the center of what the financial world calls fixed income.
How the Mechanics Work
Every credit instrument is built on three numbers. The principal (also called par value or face value) is the amount you lend. The coupon rate is the annual interest the borrower pays you, written as a percentage of principal. The maturity date is when the borrower must return the full principal. A $10,000 bond with a 5% coupon and a 10-year maturity pays $500 a year for a decade and then returns the $10,000.
Yield is where the picture gets more interesting. Buy a bond at face value when it’s first issued and your yield equals the coupon. But bonds trade on a secondary market after that, and prices move. Buy the same $10,000 bond for $9,500 and you still collect $500 a year in coupons, but your current yield is now about 5.26% because you paid less for the same income stream. The fullest measure is yield-to-maturity, which combines the price you paid, the coupon, and the time left until repayment.
Price and yield move in opposite directions. When prevailing interest rates rise, existing bonds with lower coupons become less attractive, so their market prices fall until their yields line up with new issues. Duration measures how sensitive a bond’s price is to rate changes.1FINRA. Bonds, Interest Rate Changes, and Duration A bond maturing in two years barely moves when rates shift. A 30-year Treasury can lose 15% or more of its value on a one-percentage-point rate increase.
The Main Types of Credit Instruments
Credit instruments vary by issuer, by what secures them, and by how they pay interest. Those differences drive both the risk you take and the return you earn.
Corporate Bonds
Companies issue bonds to fund operations, acquisitions, or refinancing. Secured corporate bonds are backed by specific assets such as equipment, real estate, or receivables, giving you something to claim if the company can’t pay. Unsecured bonds, often called debentures, rely solely on the company’s general ability to generate cash. Debentures carry more risk and typically pay a higher coupon than secured bonds from the same issuer.
The market draws a sharp line between investment-grade corporate bonds (rated BBB- or higher by S&P and Fitch, or Baa3 or higher by Moody’s) and high-yield bonds, sometimes called junk bonds.2S&P Global Ratings. Understanding Credit Ratings High-yield issuers have weaker balance sheets or heavier debt loads, so they compensate lenders with fatter coupons. The extra yield over a comparable Treasury is the credit spread, which widens during downturns as the market prices in higher default odds.3FINRA. Spread the Word – What You Need to Know About Bond Spreads
Government Bonds and TIPS
U.S. Treasury securities carry the lowest credit risk of any dollar-denominated instrument because they are backed by the full faith and credit of the federal government. They come in three forms: bills (one year or less), notes (two to ten years), and bonds (twenty or thirty years). Interest on Treasuries is subject to federal income tax but exempt from state and local income taxes.4Internal Revenue Service. About Tax Topic 403 Interest Received
Treasury Inflation-Protected Securities, or TIPS, add a twist. The principal adjusts up or down with the Consumer Price Index, and the fixed coupon is applied to the inflation-adjusted principal, so your interest payments grow alongside rising prices.5TreasuryDirect. Treasury Inflation-Protected Securities (TIPS) TIPS are one of the few credit instruments that directly address inflation risk.
Municipal Bonds
State and local governments issue municipal bonds to finance infrastructure, schools, and other public projects. Interest income is generally exempt from federal income tax.6Municipal Securities Rulemaking Board. Municipal Bond Basics If you live in the state that issued the bond, interest is often exempt from state and local taxes as well. A muni yielding 3.5% can put more money in your pocket than a taxable corporate bond yielding 5%, depending on your tax bracket. The honest comparison is tax-equivalent yield.
Leveraged Loans
Leveraged loans are senior, secured debt extended to companies that already carry significant borrowing. They sit at the top of the capital structure and get paid first in a bankruptcy. Their defining feature is a floating rate: instead of a fixed coupon, the rate resets periodically against a benchmark plus a credit spread. The benchmark for dollar-denominated loans is the Secured Overnight Financing Rate, or SOFR, which replaced LIBOR after that benchmark ceased publication in June 2023.7Federal Reserve Bank of New York. Transition from LIBOR
Because the rate floats, leveraged loans carry less interest rate risk than fixed-rate bonds. When rates climb, your income rises with them. The trade-off is that these borrowers tend to be heavily indebted, so credit risk is higher. Loan agreements usually include covenants restricting the borrower’s behavior, and breaching a covenant can trigger a technical default that lets lenders intervene before things get worse.
Structured Credit
Structured credit takes pools of individual loans or receivables and repackages their cash flows into tradable securities. Auto loans feed into asset-backed securities. Residential mortgages become residential mortgage-backed securities. Commercial real estate loans become commercial mortgage-backed securities. The pooled cash flows are then sliced into tranches that absorb losses in a set order: senior tranches get paid first and absorb losses last, carrying the lowest risk and the lowest yield; junior tranches absorb the first losses in exchange for a higher return.
Credit Quality and Ratings
A credit rating is an independent opinion on how likely a borrower is to meet its debt obligations on time. S&P Global Ratings, Moody’s Investors Service, and Fitch Ratings assign letter grades running from the highest quality (AAA/Aaa) down to default (D/C). These grades divide the credit universe into two camps.
Investment-grade debt (BBB- and above on the S&P and Fitch scale, Baa3 and above on Moody’s) signals strong repayment capacity.2S&P Global Ratings. Understanding Credit Ratings High-yield, or speculative-grade, debt (BB+ and below, Ba1 and below) carries materially higher risk of non-payment. Historical data from Moody’s shows annual default rates for investment-grade issuers averaging well under 1%, while speculative-grade defaults have averaged several percentage points per year. That gap explains the yield premium investors demand for holding high-yield bonds.
Many institutional investors (pension funds, insurance companies, certain mutual funds) are restricted by their mandates to hold only investment-grade debt. When a company gets downgraded from investment grade to high yield, forced selling by these institutions can push the bond’s price down sharply.
Agencies focus on a handful of core financial metrics. The debt-to-EBITDA ratio measures how many years of operating earnings it would take to pay off total debt. Interest coverage ratios show whether the borrower generates enough earnings to comfortably cover its annual interest payments. Beyond the numbers, agencies evaluate industry conditions, competitive position, and management quality. Covenants in the bond or loan document also factor in. Ratings are reviewed continuously and can be upgraded or downgraded as a borrower’s financial health changes.
The Risks
Credit investing is often described as safe relative to stocks, but that framing oversimplifies things. Several distinct risks can erode your returns or principal.
Interest Rate Risk
When market interest rates rise, the fixed coupon on your existing bond becomes less attractive against new issues, and the market price of your bond falls. The longer the maturity, the steeper the drop. A bond with a duration of seven years will lose roughly 7% of its value for every one-percentage-point increase in rates.1FINRA. Bonds, Interest Rate Changes, and Duration Hold to maturity and you still get your full principal back; sell early and you may take a loss.
Inflation Risk
Fixed coupon payments lose purchasing power when inflation runs hot. A bond paying $500 a year buys less every year if prices are rising 4% or 5% annually, and the dollars you get back at maturity buy meaningfully less than when you lent them. Credit investors track real yield, which is the nominal yield minus inflation. A 5% yield sounds good until inflation is running at 4.5%, leaving a real return of half a percent. TIPS are the standard hedge for the Treasury portion of a portfolio.
Reinvestment Risk
This is the flip side of interest rate risk. When rates fall, the coupon payments you receive can only be reinvested at the new, lower rates. If you bought a 10-year note yielding 6% and rates drop to 4% after the first year, the $600 in annual coupons now earns only about 4% when you put it back to work. The risk is especially pronounced with callable bonds and during sustained rate-cutting cycles.
Call Risk
Many corporate and municipal bonds include a call provision that lets the issuer buy back the bond early at a set price. Issuers call bonds when rates have fallen, because they can refinance more cheaply.8FINRA. Callable Bonds – Be Aware That Your Issuer May Come Calling Your income stream ends, and you reinvest the returned principal in a lower-rate environment. Callable bonds often pay a slightly higher coupon to compensate, but investors regularly underestimate how much a call can reduce their total return.
Liquidity Risk
Unlike stocks, most bonds don’t trade on a centralized exchange with continuous, transparent pricing. Corporate bonds trade over the counter, often through request-for-quote systems where dealers offer prices bilaterally. Many individual issues trade infrequently, and if you need to sell quickly, the bid-ask spread can eat into your returns. Retail investors generally face wider spreads than large institutions trading the same bond in bigger sizes. This illiquidity is one of the strongest practical arguments for using ETFs or mutual funds rather than buying individual bonds.
What Happens When a Borrower Defaults
Default doesn’t necessarily mean you lose everything. How much you recover depends almost entirely on where your instrument sits in the borrower’s capital structure and whether the debt is secured.
When a company enters bankruptcy, federal law establishes a strict payment hierarchy. Secured creditors are paid first from the specific assets backing their loans. The Bankruptcy Code then lays out a priority order for unsecured claims: administrative expenses, employee wages up to a statutory cap, tax obligations, and then general unsecured creditors like bondholders.9Office of the Law Revision Counsel. 11 USC 507 – Priorities In a Chapter 11 reorganization, no junior class of creditors can receive anything until every senior class has been paid in full, a principle called the absolute priority rule. Equity holders stand last and frequently receive nothing.
The gap between secured and unsecured recovery rates is wide. S&P Global Ratings data puts the long-term average recovery rate for senior secured loans at about 75 cents on the dollar, while unsecured bonds average roughly 40 cents. Individual outcomes vary with the industry, the borrower’s remaining asset value, and market conditions at the time of default. In 2025, bond recoveries dipped to about 21 cents on the dollar through September, their lowest level since 2001, while loan recoveries held above average at around 88 cents.10S&P Global Ratings. Default, Transition, and Recovery – US Recovery Study Seniority and security are the primary drivers of how much you get back when something goes wrong.
How to Actually Invest in Credit
Your entry point depends on your capital, your comfort with illiquidity, and how much analytical work you want to do yourself.
Mutual Funds and ETFs
For most investors, bond mutual funds and ETFs are the simplest path. Both pool money across dozens or hundreds of issuers, so a single default barely registers in the overall portfolio. ETFs trade throughout the day on exchanges and typically carry lower expense ratios. Mutual funds price once daily based on the net asset value of their holdings. Either structure handles the credit analysis, trading, and reinvestment decisions for you.
Direct Bond Purchases
Buying individual bonds gives you full control over credit quality, maturity, and coupon, but the trade-offs are real. Most corporate bonds have a face value of $1,000, and building a diversified portfolio across 20 or 30 issuers gets capital-intensive quickly. The secondary market is less liquid than the stock market, and retail investors generally face wider bid-ask spreads than institutions trading in larger sizes.
Government bonds are more accessible. Through TreasuryDirect you can buy Treasuries at auction with a non-competitive bid, meaning you accept the yield set by the auction, for amounts up to $10 million per auction. Treasury fills all non-competitive bids before addressing competitive ones.11TreasuryDirect. How Auctions Work There’s no bid-ask spread, no broker markup, and no minimum beyond the security’s face value.
Private Credit Funds
Private credit funds lend directly to middle-market companies that are too small or too complex for the public bond market. They typically take the form of limited partnerships with multi-year lock-up periods, meaning you cannot easily access your capital. Minimum investments commonly start at $250,000 or more. In exchange for that illiquidity, private credit tends to offer higher yields than publicly traded bonds of comparable credit quality.
Access is restricted to accredited investors. Under SEC rules, that means an individual with a net worth exceeding $1 million (excluding your primary residence) or annual income above $200,000 ($300,000 with a spouse) for the prior two years.12U.S. Securities and Exchange Commission. Accredited Investors Holders of certain professional licenses and certifications also qualify.
Tax Treatment of Credit Income
How your credit income is taxed depends on what you own and when you sell.
Interest payments from corporate bonds, leveraged loans, and most other taxable credit instruments are treated as ordinary income, taxed at your marginal federal rate. State and local income taxes apply in most jurisdictions. Treasury interest is a partial exception: you owe federal tax but not state or local tax.4Internal Revenue Service. About Tax Topic 403 Interest Received
Municipal bond interest receives the most favorable treatment. Income is generally exempt from federal income tax, and if you live in the state that issued the bond, often from state and local taxes too.6Municipal Securities Rulemaking Board. Municipal Bond Basics Comparing a muni yield directly to a corporate yield is misleading without calculating the tax-equivalent yield.
If you sell a bond on the secondary market for more than you paid, the profit is generally subject to capital gains tax. A bond held longer than one year qualifies for long-term capital gains rates; one sold within a year faces the higher short-term rate. Losses can offset other capital gains. Bonds purchased at a deep discount may have a portion of the gain treated as ordinary income rather than capital gains, so the math gets complicated quickly for discount bonds. Flag it with a tax professional before you sell.