Subjects and lessons to explore.

Law

Finance · Foundations

Debt

10 min read 5 practice questions
9 key termsSourcesReport an error
Want it in plain words first? Jump to Eli explains — the same idea, no jargon.
On this page 9 sections
  1. In 30 seconds
  2. Why this matters
  3. The college version
  4. Eli explains
  5. Worked example
  6. Key takeaway
  7. Quick check
  8. Study tools
  9. Sources & references

In 30 seconds

in finance is money that has been borrowed and must be repaid, usually with . The amount borrowed is the , and interest is the price paid for borrowing it. The common forms are loans, bonds, and . Debt is borrowing, not ownership: lenders must be repaid on a schedule, while owners share in the business's results. Businesses use debt to grow, which finance calls , but the payments arrive whether or not sales hold up. Debt is a tool with a schedule.

Why this matters

Almost every business and household leans on borrowed money at some point: a bakery financing an oven, a family buying a home, a city building a bridge. Debt sits at the center of finance. It is how large purchases happen before the money exists, and how businesses grow faster than their own cash allows. Understanding debt means knowing what is actually owed, what it costs, and what happens when the payments cannot be made. That knowledge turns borrowing from a leap into a decision, and it explains news, contracts, and balance sheets wherever you meet them.

The college version

What debt is

SEC Investor.gov, defines debt in its glossary as an amount owed to a person or organization for borrowed funds. Investopedia agrees: debt is something, usually money, owed by one party to another, and unless forgiven by the lender, it must be paid back, typically with added interest. The working definition this lesson uses: debt is money that has been borrowed and must be repaid, usually with interest. The amount borrowed is the principal. Investor.gov lists loans, notes, bonds, and mortgages as forms of debt. Every form carries the same deal: repay the amount owed, typically with interest, by a specific date in the repayment terms.

Borrowing versus owning

OpenStax's Principles of Finance puts the contrast simply: there are two broad types of capital, debt (or borrowing) and equity (or ownership). Companies typically finance assets through equity, selling ownership shares to stockholders, and through debt, borrowing money from lenders. Original example: a bakery needs $100,000 for a second shop. With debt, it borrows from a bank and repays the money with interest, keeping full ownership. With equity, it sells a share of the business to investors who never demand repayment, but own part of the company and share its profits. Debt is a promise to pay; equity is a promise to share. Equity is a sibling topic that has its own lesson; here it appears only as the contrast that shows what debt is not.

The three named forms

Three forms are named here, one line each. Loans: a lender gives the borrower a set amount of money that must be repaid, with interest, by a certain date. Original example: Riverside Bakery borrows $40,000 from a credit union to buy an oven, repaying it in monthly payments over five years. Bonds: a debt security, similar to an IOU, in which the borrower promises interest during the life of the and the principal back when it matures. Original example: a delivery company issues bonds to fund a new fleet of trucks; investors receive interest every six months and get their principal back in ten years. Bonds is a sibling topic; here it gets one line. Credit: revolving borrowing with a limit that the borrower can use, repay, and use again. Original example: a bike shop uses a line of credit to buy tires for a large order, repays it when the customer pays, and can borrow again.

The cost of debt: interest

Interest is the price paid for borrowing money, expressed as a percentage rate over a period of time. That is the Investor.gov glossary definition, and the working line this lesson uses. OpenStax agrees from the company side: a company's cost of debt is the interest rate it would have to pay. Interest is the cost of debt, stated simply: borrowed money is not free, and the lender charges for the use of it. Original example: two bakeries each borrow $50,000 for new equipment. One pays 4% interest, the other 9%. Both must repay the $50,000; the second simply pays more for the same money. How rates are set and moved is the territory of the interest-rates sibling topic; here, interest appears only as the price tag on borrowed money.

What the borrower owes

Every debt carries obligations, and three are named here. : the borrower must pay the money back by a specific date set in the repayment terms. Interest payments: during the life of the debt, the borrower pays interest on top of the principal, on the agreed dates. : if a borrower fails, claims are not paid all at once; senior debt has higher priority than junior claims. Investor.gov's glossary puts it in one line: a senior bond has higher priority than another bond's claim to the same assets in case of default or bankruptcy. Failing to pay principal or interest when due is default. Original example: when a company fails, senior bondholders are paid from its assets before equity owners, who stand last in line.

Why businesses borrow: leverage

OpenStax calls the debt a firm uses financial leverage. The general idea: borrowed money lets a business act bigger than its own cash. Investopedia makes the point plainly: access to debt can make all the difference in a company's ability to expand and compete. Original example: a coffee chain borrows $2 million to open ten new stores. If the stores earn more than the interest, the owners keep the difference, and the business grew without waiting years to save up. The risks are real: the payments arrive whether or not sales hold up; a company with too much debt may not make its interest payments when sales drop, risking bankruptcy; and heavy debt can force a company to devote its income to repayment instead of more productive purposes.

The honest framing

Debt is a tool with a schedule. The tool part: borrowed money funds growth, equipment, and purchases that would otherwise wait. The schedule part: every form of debt carries repayment terms, the amount, the interest, and the date, and those terms do not bend. Original example: a bakery's oven is a fine tool in a good year, when sales cover the monthly payment easily. The same loan becomes a weight in a bad one, when a flooded kitchen closes the shop for a month and the payment still arrives. Debt is not good or bad on its own. What matters is whether the borrower understands the schedule and can keep it.

Eli, the EliExplains learning guide

Eli explains

The same idea, in plain words

Explain it like I’m 10

Debt is borrowed money. Someone hands you money today, and you promise to hand it back later, plus a little extra for the favor. The amount you borrowed is the principal. The extra is interest, the price of renting someone else's money. Businesses borrow to build and grow, and that borrowed push is called leverage. But the promise is a promise: the payments arrive on schedule whether the business had a great month or a terrible one. Debt is a tool, and every tool has rules.

Picture it like this

Think of borrowing a friend's lawnmower with a promise to return it by Saturday and bring the gas. The mower is the principal; the gas is the interest. You borrow it to finish your lawn fast and move on with your day, which is leverage. But Saturday arrives no matter what, and if your own mower breaks down, you still owe the return.

Where the picture stops working

A lawnmower is returned once and the favor is over, while debt keeps generating payments for years. A friend might forgive a late return; a lender will not forgive a missed payment. And unlike the borrowed mower, debt costs money the whole time you hold it.

Worked example

Delgado Trucking needs $60,000 for a second delivery van. The bank offers a five-year loan at 7% interest: Delgado receives the principal up front, then makes fixed monthly payments that cover interest and slowly repay the principal, with the last payment due in five years. An investor offers the same $60,000 for a 20% share of the company, with no repayment required but a slice of every future profit. Delgado takes the loan: the total cost is known in advance and the owners keep full control. The trade-off is the schedule: the monthly payment arrives even in a slow month, while the investor's share would have waited for profit.

Key takeaway

Debt is borrowed money that must be repaid, usually with interest, on a schedule. Used well it helps businesses grow; forgotten, the schedule does not bend.

Quick check

3 questions here, of 5 in this lesson’s practice set. Answers stay hidden until you check.

Question 1 of 3foundational

In finance, what is debt?

Choose an answer, then check it.
Question 2 of 3intermediate

A bakery borrows $40,000 from a credit union to buy a new oven, agreeing to repay the full amount with interest over five years. What form of debt is this?

Choose an answer, then check it.
Question 3 of 3intermediate

A coffee chain borrows $2 million to open ten new stores, expecting the stores to earn more than the interest on the borrowed money. What is this use of borrowed money called?

Choose an answer, then check it.
Practice all 5

Keep learning

Ready to build on this? Continue to the next lesson.

Practice this lesson
Study tools & related lessonsYou’ll learn to · Common mistakes · Easily confused · Key vocabulary · Related

You’ll learn to

  • Define debt in finance as money that has been borrowed and must be repaid, usually with interest, using the working definitions from Investor.gov and Investopedia.
  • Contrast debt with equity as borrowing versus ownership, with an original example.
  • Name loans, bonds, and credit as forms of debt, each with one line and an original example.
  • Explain that interest is the price of borrowing and therefore the cost of debt, stated simply.
  • Name the obligations debt carries: the repayment schedule, interest payments, and seniority.
  • Explain why businesses borrow, the general idea of leverage, and name its risks, with an original example.

Common mistakes

  • Treating debt as free money.

    The borrowed amount is not income the business keeps; debt must be repaid, typically with interest, according to the agreed terms.

  • Confusing debt with equity.

    Debt must be repaid on a schedule; equity is ownership that requires no repayment but gives up a share of the business and its profits.

  • Forgetting that debt runs on a schedule.

    Every debt has repayment terms with a date; a promising idea or a busy season does not pause the payments.

  • Thinking leverage only boosts gains.

    Borrowed money amplifies results in both directions: when sales drop, the fixed payments still arrive, and heavy debt can threaten the business itself.

Easily confused

Debt vs. Equity

Debt is borrowed money that must be repaid with interest on a schedule; equity is ownership that shares in the business's results. Lenders' claims come first, owners' claims come last.

Loan vs. Bond

A loan is an agreement between one borrower and one lender with repayment terms; a bond is a debt security sold to many investors, who can trade it, with interest paid during its life and principal repaid at maturity.

Key vocabulary

Debt
Money that has been borrowed and must be repaid, typically with interest, according to agreed terms.
Principal
The total amount of money that was borrowed or lent, before any interest is added.
Interest
The price paid for borrowing money, expressed as a percentage of the amount borrowed.
Loan
A form of debt in which a lender gives a borrower a set amount of money to be repaid by a certain date, usually with interest.
Bond
A debt security in which the borrower promises to pay interest during its life and repay the principal when it matures.
Credit
A form of debt that lets a borrower use money up to a set limit and repay it repeatedly, such as a credit card or line of credit.
Repayment schedule
The agreed timing and amounts of the payments a borrower must make to pay a debt back.
Seniority
The order in which lenders' claims are paid if a borrower fails, with senior debt paid before junior claims.
Leverage
The use of borrowed money to finance a business, aiming to earn more than the interest costs.

Sources & references

  1. Liability/Debt (Investor.gov glossary) — U.S. Securities and Exchange Commission, Investor.gov
  2. Interest (Investor.gov glossary) — U.S. Securities and Exchange Commission, Investor.gov
  3. Bonds (Investor.gov glossary) — U.S. Securities and Exchange Commission, Investor.gov
  4. Principal (Investor.gov glossary) — U.S. Securities and Exchange Commission, Investor.gov
  5. Senior Bond (Investor.gov glossary) — U.S. Securities and Exchange Commission, Investor.gov
  6. Principles of Finance, Section 17.1: The Concept of Capital Structure — OpenStax, Rice University
  7. Principles of Finance, Section 17.2: The Costs of Debt and Equity Capital — OpenStax, Rice University
  8. Debt: What It Is, How It Works, Types, and Ways to Pay Back — Investopedia

EliExplains lessons are original prose written from the open, credible references above. See Copyright & Licensing.

Researched 2026-08-21

Educational content only. It is not medical, legal or professional advice. Found an error? Tell us.