Examples of debt instruments include U.S. Treasury bills, notes, and bonds; corporate and municipal bonds; commercial paper; promissory notes; term loans and mortgages; certificates of deposit; lines of credit; and specialized structures like convertible bonds, zero-coupon bonds, and repurchase agreements. Each is a written contract obligating a borrower to repay money on defined terms, but they differ sharply in who issues them, how long the money is tied up, whether they trade on a market, and how the income is taxed.
What Every Debt Instrument Has in Common
Before the examples diverge, four features tie them together.
The principal is the original amount advanced, and it is the baseline the borrower must return. The interest rate is what the borrower pays for the use of that money; on a bond, the rate printed at issuance is the coupon, while yield to maturity reflects the total annual return based on the price actually paid. The maturity date is when principal comes back, running from overnight for a repurchase agreement to 30 years for a long Treasury bond. And the repayment obligation is legally enforceable, which is what separates a debt instrument from a gift.
Marketable Debt Instrument Examples
Marketable debt securities are standardized instruments issued by large entities and designed to trade on public markets after their initial sale. Standardization makes them easy to compare and price.
U.S. Treasury Securities
Treasuries are the benchmark for low-risk debt because they carry the full faith and credit of the federal government. They come in three main maturities: Treasury bills run from four weeks up to 52 weeks, Treasury notes mature in two to ten years, and Treasury bonds carry terms of 20 or 30 years.1TreasuryDirect. About Treasury Marketable Securities Interest is taxable at the federal level but exempt from state and local income taxes.2Office of the Law Revision Counsel. 31 USC 3124 – Exemption From Taxation
Corporate Bonds
Companies issue corporate bonds to fund operations, expansion, or acquisitions. A secured bond is backed by specific collateral such as real estate or equipment. An unsecured bond, called a debenture, relies on the issuer’s overall financial strength. In bankruptcy, secured creditors get paid from their collateral before unsecured creditors see anything, so debentures pay higher interest to compensate.
Municipal Bonds
State and local governments issue municipal bonds to fund public projects such as schools, highways, and water systems. Interest on most munis is excluded from federal gross income,3Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds which makes them especially attractive to investors in high tax brackets.
Not every muni gets the full exemption. Private activity bonds, which finance projects with significant private use like stadiums or airports, can trigger the alternative minimum tax because interest on specified private activity bonds is treated as a tax preference item.4Office of the Law Revision Counsel. 26 USC 57 – Items of Tax Preference Some municipalities also issue fully taxable bonds when federal rules restrict the tax-exempt option or when the issuer wants to reach tax-exempt institutional buyers like pension funds.
Commercial Paper
Commercial paper is an unsecured, short-term IOU issued by large corporations with strong credit ratings, used to cover routine obligations like payroll and inventory. Under the Securities Act of 1933, notes with a maturity of nine months or less (roughly 270 days) are exempt from SEC registration, which is why commercial paper stays at or below that threshold.5GovInfo. Securities Act of 1933 The trade-off for that short maturity is lower yields than longer-term corporate bonds.
Private Debt Instrument Examples
Private debt obligations are held directly by the original lender rather than traded on public markets. They tend to be customized, without the standardized terms that make marketable securities easy to price.
Promissory Notes
A promissory note is the simplest debt instrument. One party writes down a promise to pay a specific amount to another party, either on demand or by a set date. These appear constantly in seller-financed real estate, small business lending, and loans between family members. To be enforceable, the note needs to identify the principal, interest rate, and repayment schedule.
Most promissory notes include an acceleration clause, which lets the lender demand the entire remaining balance immediately if the borrower misses payments or otherwise violates the terms. Without that clause, a lender would be stuck chasing each missed payment individually.
Term Loans
A term loan gives the borrower the entire amount upfront with a fixed repayment schedule. Business term loans often run three to ten years and come with covenants restricting the borrower’s financial decisions, such as maintaining minimum cash reserves or capping additional debt. Personal term loans, like auto loans, are typically secured by the purchased asset, so the lender can repossess the car if payments stop.
Mortgages
A mortgage is a term loan secured by real property. The mortgage document creates a lien on the home, giving the lender the right to foreclose if the borrower defaults. That security lets lenders offer far lower interest rates than they would on unsecured debt of similar size. Mortgage interest may be deductible on federal income taxes, subject to caps on the total loan balance that depend on when the mortgage was originated; the current rules are laid out in IRS Publication 936.6Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction
Certificates of Deposit and Revolving Credit
A certificate of deposit is a time deposit issued by a bank. The depositor lends money to the bank for a fixed term and earns a fixed interest rate, typically higher than a standard savings account. CDs held at FDIC-insured banks are protected up to $250,000 per depositor, per institution. They carry no market risk but penalize early withdrawals.
Lines of credit and credit cards work differently from every instrument above because they are revolving. The borrower can draw funds, repay them, and borrow again up to a set limit without taking out a new loan. A home equity line of credit (HELOC) is a common example, secured by the borrower’s home. Revolving credit has no fixed maturity for the overall facility, though individual balances accrue interest from the draw date.
Specialized Debt Instrument Examples
Convertible Bonds
A convertible bond starts as a regular corporate bond paying fixed interest, but gives the holder the option to swap it for a set number of the issuer’s common stock shares at a conversion price locked in at issuance. If the stock rises above that price, the investor can convert and capture the equity upside. If it languishes, the investor keeps collecting bond interest and gets principal back at maturity. Because the option has real value, companies can issue convertibles at lower interest rates than they would pay on straight debt.
Zero-Coupon Bonds
Zero-coupon bonds pay no periodic interest. They sell at a steep discount to face value, and the investor receives the full face value at maturity. Buy a zero for $600 that matures at $1,000 in ten years, and that $400 spread is the entire return. The IRS calls that spread original issue discount (OID).7eCFR. 26 CFR 1.1273-1 – Definition of OID
Here is the catch. Even though no cash arrives until maturity, federal income tax is owed on the OID as it accrues each year, because the tax code requires holders to include a portion of the discount in gross income annually.8Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount That makes zero-coupon bonds a better fit for tax-advantaged accounts like IRAs than for taxable brokerage accounts.
Repurchase Agreements
A repurchase agreement (repo) is a short-term borrowing mechanism used mainly by securities dealers and financial institutions. The dealer sells government securities to an investor, often overnight, and simultaneously agrees to buy them back at a slightly higher price the next day. That price difference is effectively the interest on a very short, very secure loan. Repos provide the daily liquidity that keeps bond markets functioning.
Risks That Come With Holding Debt
Debt instruments are often called fixed income because their payment schedules are predetermined. That predictability is the main appeal, and it also creates specific vulnerabilities.
Interest rate risk. Bond prices and interest rates move in opposite directions. When rates rise, existing bonds with lower coupon rates become less attractive, so their market prices fall. The longer the remaining maturity, the sharper the drop. Duration measures how sensitive a bond’s price is to rate changes, and longer-duration bonds swing more in both directions.
Inflation risk. A bond paying 4% annually loses ground when inflation runs at 5%. The erosion hits long-term fixed-rate instruments hardest because the purchasing power of both coupon payments and returned principal declines over time. Treasury Inflation-Protected Securities (TIPS) address this by adjusting principal based on changes in the Consumer Price Index.
Credit risk. This is the possibility that the issuer cannot make interest payments or repay principal. Moody’s, S&P, and Fitch grade this risk with letter ratings. Bonds rated BBB (S&P and Fitch) or Baa (Moody’s) and above are investment grade, meaning they carry a relatively low chance of default.9Investor.gov. Investment-grade Bond (or High-grade Bond) Anything below is called high-yield or junk debt and pays more to compensate. U.S. Treasuries carry essentially zero credit risk because the federal government can always raise taxes or issue new debt to meet its obligations.
How Debt Instrument Income Is Taxed
Tax treatment depends on who issued the instrument, what type it is, and whether you hold it to maturity or sell early.
Interest income. Most interest is taxable as ordinary income in the year received or accrued. Banks and brokers report interest of $10 or more on Form 1099-INT.10Internal Revenue Service. About Form 1099-INT, Interest Income The main exception is interest on qualified municipal bonds, excluded from federal gross income.3Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds Treasury interest sits in between: federally taxable, state and local exempt.2Office of the Law Revision Counsel. 31 USC 3124 – Exemption From Taxation
Original issue discount. Holders of zero-coupon bonds and other instruments issued at a discount must include a portion of the OID in gross income each year as it accrues, even without any cash payment that year.8Office of the Law Revision Counsel. 26 USC 1272 – Current Inclusion in Income of Original Issue Discount Tax-exempt bonds and U.S. savings bonds are outside these rules.
Selling before maturity. Holding a bond bought at face value to maturity produces no capital gain or loss. Selling on the secondary market does: the difference between the adjusted cost basis and the sale price is a capital gain or loss, taxed short-term or long-term depending on holding period. An investor who buys a bond at a premium above face value can elect to amortize that premium against interest income over the remaining life of the bond.
A Note on the Borrower Side
If you are the one owing rather than lending, federal rules apply that many people do not realize exist. The Fair Debt Collection Practices Act prohibits third-party collectors from calling before 8 a.m. or after 9 p.m., contacting you at work when the employer prohibits it, or publicly posting about the debt on social media, and it requires collectors to route communications through your attorney if you have one.11Consumer Financial Protection Bureau. What Laws Limit What Debt Collectors Can Say or Do? Those rules apply to collection agencies, debt buyers, and collection attorneys, but generally not to the original creditor. Every debt also carries a statute of limitations, ranging from roughly four to twenty years depending on the type of debt and governing state law. Once that window closes, the debt is time-barred, but collectors can still contact you, and if one files suit you must appear and raise the expiration as a defense. Ignoring the lawsuit risks a default judgment regardless of whether the deadline has passed.