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Unit 3 · Topic 3.2

3.2 Borrowing, Credit, and Debt

Borrowing lets you buy something now and pay for it later, with interest. This topic covers why people borrow, who lends to them, how lenders decide whether you're a good risk, and how to manage debt and credit wisely.

Key terms

  • interest
  • secured vs. unsecured loan
  • collateral
  • creditworthiness
  • credit report
  • credit score

Why people borrow and who lends

People borrow mainly to buy things that cost more than their income and savings, like a car, a home or college. They also borrow to handle emergencies, to keep their savings intact or just for convenience, such as using a credit card.

Borrowing creates a debt, a personal liability, that you repay with interest. Interest is the price of borrowing money. The rate and repayment terms depend on the lender, the type of loan, the amount and your credit history.

A secured loan is backed by collateral, something the lender can take if you don't pay. Car loans and mortgages (home loans) are secured by the car or house itself. Unsecured loans, like most personal loans and credit cards, have no collateral, so they usually charge higher rates.

  • Banks and credit unions lend out money that savers, businesses and others have deposited.
  • Credit card companies, stores and mortgage lenders also lend to consumers.
  • Alternative financial services, such as payday loans, check-cashing services and instant tax refunds, lend to people who may not qualify elsewhere, usually at much higher cost.

Consumer protection

Federal laws require lenders to state credit terms, such as the annual percentage rate (APR) and fees, clearly. Other laws limit what debt collectors can do and ban lending discrimination based on traits like race, sex or religion. The Consumer Financial Protection Bureau (CFPB) enforces many of these rules.

How lenders judge creditworthiness

Every lender risks default, the borrower not repaying. So lenders prefer people with low existing debt, high income and savings, and a record of paying on time. Lenders that accept riskier borrowers charge higher interest to make up for the risk.

To judge creditworthiness, lenders look at your income, savings, existing debt and your credit report. Credit reports are compiled by credit bureaus (Equifax, Experian and TransUnion), which collect information whenever you deal with lenders: opening accounts, taking out loans, applying for cards and making payments. A credit report comes with a credit score, a number summarizing how you've used credit. Most credit scores, including the common FICO scores, run from 300 to 850, and higher is better (CFPB, consumerfinance.gov, checked October 2026). Lenders, landlords, insurers, employers and government agencies may check your report.

Managing debt

Debt payments take income that could go to saving or other needs, and bigger debts or higher rates mean bigger payments. People fall behind when they lose income or take on payments they can't afford. Borrowers limit the damage in a few ways:

  • Keeping a high credit score: paying bills on time, paying down debt and using credit cards sparingly.
  • Paying off high-interest debt, like credit card balances, as quickly as possible.
  • Getting better terms: comparing offers from several lenders, and making a down payment (paying part of the price up front) on big purchases so less is borrowed.
  • If debt becomes unmanageable, for example if property is being seized, debt management help may be available. Bankruptcy is a legal process that wipes out some debts and sets up a repayment plan for others, at a heavy cost to your credit.

Worked examples

Try each one yourself first, then open the solution.

  1. Example 1Calculator allowed

    The minimum-payment trap

    Sam owes $2,000 on a credit card with a 24% APR (2% interest a month) and makes no new purchases. About how long will payoff take, and how much interest will he pay, if he pays $50 a month versus $100 a month? (Computed month by month.)

    Show the solution
    1. Step 1: In the first month, interest is $2,000 × 0.02 = $40. A $50 payment only cuts the balance by $10, so progress is very slow at first.
    2. Step 2: Running the numbers month by month: at $50 a month, payoff takes 82 months (almost 7 years), and he pays about $4,064 in total, about $2,064 of it interest.
    3. Step 3: At $100 a month, payoff takes 26 months and he pays about $2,580 in total, about $580 of it interest.
    4. Step 4: Doubling the payment cuts the interest by about $1,484 and saves more than 4 years.

    Answer: $50 a month: 82 months and about $2,064 in interest. $100 a month: 26 months and about $580 in interest. Paying high-interest debt fast saves a lot.

  2. Example 2Calculator allowed

    How the rate and a down payment change a car loan

    A $15,000 car loan is repaid over 48 months. Using a loan calculator, the monthly payment is $352.28 at 6% APR and $373.28 at 9% APR. Find the total interest for each. Then, at 6%, the payment on a $12,000 loan (after a $3,000 down payment) is $281.82. How much interest does the down payment save?

    Show the solution
    1. Step 1: Total paid = monthly payment × 48. Total interest = total paid − amount borrowed.
    2. Step 2: 6%: $352.28 × 48 = $16,909.44, so interest ≈ $16,909 − $15,000 = $1,909.
    3. Step 3: 9%: $373.28 × 48 = $17,917.44, so interest ≈ $2,917. The higher rate costs about $1,008 more.
    4. Step 4: With $3,000 down at 6%: $281.82 × 48 = $13,527.36, so interest ≈ $1,527, about $382 less than borrowing the full $15,000.

    Answer: About $1,909 interest at 6% and $2,917 at 9%. A $3,000 down payment at 6% cuts interest to about $1,527, saving about $382.

Common mistakes

  • Thinking a secured loan is riskier for the borrower so it costs more. Collateral lowers the lender's risk, so secured loans usually have lower rates.
  • Believing minimum payments are a good way to pay off a card. Most of an early payment goes to interest.
  • Forgetting that a credit report affects more than loans: landlords, insurers and some employers may check it.

On the exam

  • Expect questions asking which factor most affects a borrower's interest rate, or which action would raise a credit score.
  • In Question 2, a strong recommendation names a specific action (pay off the 22% card first, make a larger down payment) and explains with numbers how it helps the household's goal.

Connected topics

Videos

  • Credit and Debt Explained | AP Business Topic 3.2

    Jacob CliffordWatch on YouTube (opens in a new tab)

  • Borrowing, Credit, and Debt (FULL LESSON) | AP Business with Personal Finance (AP BPF) 3.2

    MAMAKOWatch on YouTube (opens in a new tab)

  • What Goes Into Your Credit Score?

    Two CentsWatch on YouTube (opens in a new tab)

  • How a FICO Credit Score Is Determined (2020 update) | Continuing Feducation

    Federal Reserve Bank of St. LouisWatch on YouTube (opens in a new tab)

  • Secured and unsecured credit | Loans and debt | Financial Literacy | Khan Academy

    Khan AcademyWatch on YouTube (opens in a new tab)

  • [PRACTICE IT] MATH: The Cost of Minimum Payments

    Next Gen Personal FinanceWatch on YouTube (opens in a new tab)

Check yourself: 3.2 Borrowing, Credit, and Debt

4 questions on 3.2 Borrowing, Credit, and Debt. Pick an answer to see if you got it, and why.

Two people apply to the same bank for a $15,000 loan to buy a car. The car would serve as collateral for the loan.

Applicant 1: Monthly income of $4,200. Savings of $6,000. Existing debt payments of $300 a month. Has paid every bill on time for five years.

Applicant 2: Monthly income of $3,100. Savings of $400. Existing debt payments of $1,100 a month, including a large credit card balance. Missed two payments last year.

Hypothetical loan applications

Question 1 of 4

Which applicant will the bank most likely view as less risky, and how will that likely affect the loan?

Question 2 of 4Calculator allowed

About what percent of Applicant 2's monthly income already goes to debt payments?

Question 3 of 4

Because the car serves as collateral, the car loan is

Question 4 of 4

Which plan would most likely improve Applicant 2's credit score over time?

0 of 4 answered