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How Student Loans Actually Work
Federal vs private, interest accrual, and repayment plans
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Student loans let students borrow money now and repay it later, usually with interest. They matter because the amount you borrow can shape your monthly budget for years after graduation. A loan is not just the original amount borrowed, since interest and fees can increase the total cost. Understanding the flow of money helps you compare choices before signing a promissory note.
In most cases, loan money moves from the lender to the school first, where tuition, fees, housing, and meal charges are paid. Any remaining money may be refunded to the student for approved education costs, but it is still borrowed money that must be repaid. Federal loans usually have fixed rates and flexible repayment protections, while private loans depend more on credit history and lender rules. Subsidies, deferment, income-driven plans, and forgiveness programs all affect when interest grows and how repayment works.
Key Facts
- Total repayment = principal + interest + fees
- Simple interest for one year can be estimated by I = PRT, where P is principal, R is annual rate, and T is time in years
- Monthly interest estimate = loan balance x annual interest rate / 12
- Subsidized federal loans usually do not accrue interest while you are in school at least half time
- Unsubsidized and many private loans usually accrue interest during school and deferment
- Standard repayment often uses fixed monthly payments over 10 years, while income-driven repayment links payment size to income and family size
Vocabulary
- Principal
- The principal is the original amount of money borrowed before interest and fees are added.
- Interest
- Interest is the cost of borrowing money, usually shown as a yearly percentage of the loan balance.
- Subsidized loan
- A subsidized loan is a federal student loan where the government pays the interest during certain periods, such as while the student is enrolled at least half time.
- Deferment
- Deferment is a temporary delay in required payments, but interest may still grow depending on the loan type.
- Income-driven repayment
- Income-driven repayment is a federal repayment plan that sets monthly payments based on income, family size, and eligible loan balance.
Common Mistakes to Avoid
- Thinking the refund check is free money: it is usually leftover borrowed money and must be repaid with interest if not returned or used carefully.
- Assuming deferment stops all loan growth: deferment may pause required payments, but unsubsidized and private loans often keep accruing interest.
- Comparing loans only by the monthly payment: a lower payment can make the loan last longer and increase the total interest paid.
- Ignoring the difference between federal and private loans: private loans may have fewer repayment protections, fewer forgiveness options, and credit-based terms.
Practice Questions
- 1 A student borrows $5,500 in an unsubsidized loan at 6% annual interest. About how much interest accrues during one year of school using I = PRT?
- 2 A loan balance is $12,000 with a 5.4% annual interest rate. Estimate the interest added in one month using monthly interest = balance x annual rate / 12.
- 3 A student has both a subsidized federal loan and a private loan. If they enter deferment after graduation, explain why the two loans may grow differently over time.