How Do Student Loans Work? A Complete Guide

Student loans help you pay for college when savings, scholarships, and grants don't cover the full cost. You borrow money now and pay it back later, usually with interest.

There are two main categories: federal student loans (funded by the U.S. government) and private student loans (offered by banks, credit unions, and online lenders). Each works differently, and understanding the differences can save you thousands of dollars over the life of your loan.

This guide breaks down everything you need to know about how student loans work, from applying to repaying them after graduation.

A student loan is money you borrow to pay for education expenses like tuition, room and board, books, and other costs. Here's the basic process:

1. You apply for loans. For federal loans, you fill out the FAFSA (Free Application for Federal Student Aid). For private loans, you apply directly with a lender.

2. Your school determines costs. The financial aid office calculates your cost of attendance and packages your aid, which may include grants, scholarships, work-study, and loans.

3. Funds are disbursed. Loan money goes directly to your school to cover tuition and fees. Any remaining amount is refunded to you for other expenses.

4. Interest accrues. Depending on the loan type, interest may start building while you're in school or after you graduate.

5. You repay after graduation. Most loans give you a six-month grace period after leaving school before payments begin. You then make monthly payments over a set repayment term (typically 10 to 25 years).

There are several types of student loans, and they fall into two broad categories: federal and private. About 92.7% of all outstanding student loan debt is federal.

Federal Student Loans

Federal student loans are funded by the U.S. Department of Education. They generally offer lower interest rates, more flexible repayment options, and access to forgiveness programs that private loans don't.

To apply, you'll need to complete the FAFSA. No credit check is required for most federal loans (except PLUS loans), and you don't need a co-signer.

Direct Subsidized Loans

These are available to undergraduate students who demonstrate financial need. The government pays the interest while you're enrolled at least half-time, during the six-month grace period after graduation, and during deferment periods. This makes subsidized loans the most affordable option.

For the 2025-2026 academic year, the interest rate on Direct Subsidized Loans is 6.39% (fixed for the life of the loan).

> Learn more: Subsidized vs. Unsubsidized Loans

Direct Unsubsidized Loans

Available to both undergraduate and graduate students regardless of financial need. Unlike subsidized loans, interest starts accruing from the moment funds are disbursed. You can choose to pay the interest while in school or let it capitalize (get added to your principal balance).

Interest rates for 2025-2026: 6.39% for undergraduates, 7.94% for graduate and professional students.

Direct PLUS Loans

PLUS loans are available to graduate students and parents of dependent undergraduates. They require a credit check (borrowers can't have an "adverse credit history"), and the interest rate is higher: 8.94% for 2025-2026.

The maximum you can borrow is the cost of attendance minus any other financial aid received. PLUS loans also carry an origination fee of about 4.228%.

If you're denied due to credit history, you can still qualify by getting an endorser (similar to a co-signer) or by documenting extenuating circumstances.

The amount you can borrow in federal loans depends on your year in school and dependency status.

Dependent Undergraduates:

• Freshman year: $5,500 (up to $3,500 subsidized)
• Sophomore year: $6,500 (up to $4,500 subsidized)
• Junior year and beyond: $7,500 (up to $5,500 subsidized)
• Aggregate limit: $31,000 (up to $23,000 subsidized)

Independent Undergraduates:

• Freshman year: $9,500 (up to $3,500 subsidized)
• Sophomore year: $10,500 (up to $4,500 subsidized)
• Junior year and beyond: $12,500 (up to $5,500 subsidized)
• Aggregate limit: $57,500 (up to $23,000 subsidized)

Graduate Students:

• Annual limit: $20,500 in Direct Unsubsidized Loans
• Aggregate limit: $138,500 (including undergraduate borrowing)

Starting with the 2026-2027 academic year, new caps apply to graduate borrowing: $100,000 lifetime limit for most graduate programs, and $200,000 for professional programs like medical school.

If federal loans don't cover your full cost of attendance, private student loans can fill the gap. These are offered by banks, credit unions, and online lenders like Sallie Mae, Discover, and College Ave.

How Do Private Student Loans Work?

Private student loans work differently from federal loans in several important ways:

• Credit-based approval. You'll need a good credit score (or a co-signer who has one) to qualify. Lenders evaluate your credit history, income, and debt-to-income ratio.
• Variable or fixed rates. Private loans may offer fixed or variable interest rates. Variable rates can start lower but increase over time. Rates depend on your creditworthiness and can range from about 4% to 17%.
• No FAFSA required. You apply directly with the lender.
• Fewer protections. Private loans generally don't offer income-driven repayment plans, loan forgiveness, or the same deferment and forbearance options that federal loans do.

Private student loans can cover all costs associated with college, including tuition, housing, books, and living expenses. Some lenders disburse funds directly to the school, while others may send funds to you.

Compare student loan lenders

Interest is the cost of borrowing money. It's expressed as a percentage of your loan balance and can add thousands of dollars to what you ultimately repay.

Current Federal Student Loan Interest Rates (2025-2026)

• Direct Subsidized and Unsubsidized (undergraduate): 6.39%
• Direct Unsubsidized (graduate/professional): 7.94%
• Direct PLUS (parent and graduate): 8.94%

Federal rates are fixed for the life of the loan and reset each July based on the 10-year Treasury note rate plus a margin set by Congress.

How Student Loan Interest Works

Interest on student loans typically accrues daily using a simple daily interest formula:

Daily interest = (loan balance x interest rate) / 365.25

For example, on a $10,000 loan at 6.39%, you'd accrue about $1.75 per day in interest. Over a four-year degree, that's roughly $2,555 in interest before you even start repaying if you have unsubsidized loans.

With subsidized loans, the government covers this interest while you're in school. That's why subsidized loans are the better deal when you can get them.

Interest Capitalization

When unpaid interest gets added to your principal balance, it's called capitalization. This means you start paying interest on a larger amount, which increases your total cost. Capitalization typically happens when your grace period ends, when a deferment or forbearance period ends, or if you leave an income-driven repayment plan.

Federal Student Loans

The process starts with the FAFSA:

Step 1: Complete the FAFSA. File at studentaid.gov using your (and your parents') tax information. The FAFSA opens on October 1 each year for the following academic year.

Step 2: Review your financial aid offer. Your school will send you a financial aid package showing grants, scholarships, work-study, and loan options. Review it carefully.

Step 3: Accept the loans you need. You don't have to accept the full amount offered. Only borrow what you actually need.

Step 4: Complete entrance counseling. First-time borrowers must complete a brief online counseling session that explains your loan terms and responsibilities.

Step 5: Sign the Master Promissory Note (MPN). This is a legal document in which you promise to repay your loans plus interest.

> Read more: How to Pay for College

Private Student Loans

For private loans, you apply directly with each lender. You'll typically need:

• A completed application with personal and financial information
• Proof of enrollment at an eligible school
• A co-signer (if you have limited credit history)
• Income verification (for the co-signer, if applicable)

Many lenders let you check rates with a soft credit pull that won't affect your credit score. Once approved, funds are usually sent directly to your school.

After you graduate (or drop below half-time enrollment), most student loans enter a six-month grace period before you need to start making payments. Here are the main repayment plans available:

Federal Repayment Plans

Standard Repayment Plan Fixed monthly payments over 10 years. This is the default plan and the fastest way to pay off your loans, though monthly payments will be higher.

Graduated Repayment Plan Payments start low and increase every two years over a 10-year term. Good if you expect your income to grow steadily.

Extended Repayment Plan Available if you owe more than $30,000. Extends your repayment period up to 25 years with fixed or graduated payments. Lower monthly payments, but you'll pay more interest overall.

Income-Driven Repayment (IDR) Plans These plans set your monthly payment based on your income and family size. Several options exist:

• Income-Based Repayment (IBR): Payments capped at 10-15% of discretionary income. Remaining balance forgiven after 20 or 25 years.
• Pay As You Earn (PAYE): Payments capped at 10% of discretionary income. Forgiveness after 20 years.
• Income-Contingent Repayment (ICR): Payments are the lesser of 20% of discretionary income or what you'd pay on a fixed 12-year plan. Forgiveness after 25 years.

Starting July 1, 2026, new borrowers will have access to the Repayment Assistance Plan (RAP), which sets payments at 1% to 10% of adjusted gross income with forgiveness after 30 years of repayment.

Refinancing replaces your existing student loans with a new private loan, ideally at a lower interest rate. A private lender pays off your old loans and issues a new one with different terms.

Refinancing makes sense if you have strong credit (or a co-signer who does), stable income, and want to lower your interest rate or monthly payment. Borrowers with credit scores above 690 typically qualify for the best rates.

However, refinancing federal loans into a private loan means you lose access to federal protections like income-driven repayment, loan forgiveness, deferment, and forbearance. Only refinance federal loans if you're confident you won't need those safety nets.

When Refinancing Makes Sense

• You have high-interest private loans and can qualify for a lower rate
• You have a strong income and don't need federal protections
• You want to combine multiple loans into one payment
• You're a parent with PLUS loans and want a lower rate

When to Avoid Refinancing

• You're pursuing Public Service Loan Forgiveness (PSLF)
• You're on or considering an income-driven repayment plan
• Your income is unstable and you may need deferment or forbearance

Several programs can reduce or eliminate your student loan balance:

Public Service Loan Forgiveness (PSLF) If you work full-time for a qualifying government or nonprofit employer and make 120 qualifying payments on an income-driven repayment plan, your remaining federal loan balance is forgiven. PSLF forgiveness is tax-free.

Income-Driven Repayment Forgiveness After 20 or 25 years of payments on an IDR plan, your remaining balance is forgiven. However, the forgiven amount may be treated as taxable income starting in 2026.

Teacher Loan Forgiveness Teachers who work for five consecutive years in low-income schools can receive up to $17,500 in forgiveness on Direct Subsidized and Unsubsidized Loans.

Perkins Loan Cancellation Borrowers with outstanding Perkins Loans (the program ended in 2017) who work in certain public service roles may qualify for partial or full cancellation.

> Read more: How Does Student Loan Forgiveness Work?

Choosing between federal and private student loans is one of the most important financial decisions you'll make as a student. Here's how they compare:

• Interest rates: Federal rates are fixed by Congress (currently 6.39-8.94%). Private rates vary by lender and creditworthiness (roughly 4-17%).
• Credit requirements: Most federal loans don't require a credit check. Private loans almost always do.
• Repayment flexibility: Federal loans offer income-driven plans, deferment, forbearance, and forgiveness. Private loans have limited or no flexible repayment options.
• Borrowing limits: Federal loans have annual and aggregate caps. Private loans can cover up to the full cost of attendance.
• Co-signer requirements: Federal loans (except PLUS) don't need a co-signer. Most private loans require one for students with limited credit.
• Application process: Federal loans require the FAFSA. Private loans require a direct application with each lender.

The bottom line: start with federal loans. They're more borrower-friendly in almost every way. Only turn to private loans if you've maxed out your federal options and still need additional funding.

Smart borrowing and repayment strategies can save you thousands:

• Only borrow what you need. Just because you're offered a certain amount doesn't mean you should take it all. Every extra dollar borrowed costs more with interest.
• Pay interest while in school. Even small payments on unsubsidized loans can prevent interest capitalization and significantly reduce your total cost.
• Use autopay. Most federal and private servicers offer a 0.25% interest rate reduction for setting up automatic payments.
• Consider the 10-year standard plan. If you can afford it, the standard plan saves the most on interest compared to extended or IDR plans.
• Look into employer repayment benefits. Some employers offer student loan repayment assistance as a benefit. Under current tax law, employers can contribute up to $5,250 per year tax-free toward employee student loans.
• Don't ignore your loans. If you're struggling to make payments, contact your loan servicer immediately. Options like deferment, forbearance, or switching to an income-driven plan can help you avoid default.