How Do Student Loans Work?
Student loans are one of the few major financial products most people take on before they've had to manage a real budget. Understanding the basics — before you borrow, and again once repayment starts — makes a real difference in how much you ultimately pay.
Federal vs private student loans
These are fundamentally different products, even though they're both called "student loans":
| Feature | Federal loans | Private loans |
|---|---|---|
| Lender | U.S. Department of Education | Bank, credit union, or online lender |
| Approval basis | Enrollment, no credit check (undergrad) | Credit score and income (often needs a cosigner) |
| Interest rate | Fixed, set annually by law | Fixed or variable, varies by lender/credit |
| Repayment plans | Multiple, including income-driven | Limited, lender-specific |
| Forgiveness eligible | Yes, several programs | Generally no |
The general rule of thumb from financial aid offices: exhaust federal loan options first, since they carry more protections, before turning to private loans to cover any remaining gap.
How interest actually accrues
This is the part that surprises the most borrowers. Subsidized federal loans don't accrue interest while you're enrolled at least half-time — the government covers it. Unsubsidized federal loans, along with nearly all private loans, start accruing interest from the day the money is disbursed, even while you're still in school and not making payments. That unpaid interest can capitalize (get added to your principal) at certain points, meaning you end up paying interest on interest.
The grace period
Most loans don't require payments the moment you graduate. Federal loans typically include a six-month grace period after you graduate, leave school, or drop below half-time enrollment. Private lenders set their own grace periods, which can be shorter, longer, or nonexistent — check your specific loan terms.
Repayment plan options (federal loans)
- Standard repayment — fixed payment over 10 years. Pays the least interest overall for those who can afford the payment.
- Graduated repayment — starts lower and increases every two years, over 10 years. Useful if you expect rising income.
- Extended repayment — up to 25 years, lowering the monthly payment but increasing total interest paid.
- Income-driven repayment — caps payments at a percentage of discretionary income, recalculated yearly, with remaining balance forgiven after 20-25 years.
Private loans don't offer income-driven options — repayment terms are whatever you agreed to when you signed, though some lenders offer limited hardship deferment or forbearance.
Loan forgiveness programs, briefly explained
Forgiveness is available only on federal loans, and only under specific programs — it's not automatic and it's easy to misunderstand:
- Public Service Loan Forgiveness (PSLF) — forgives remaining balance after 120 qualifying monthly payments (10 years) while working full-time for a qualifying government or nonprofit employer, on an income-driven repayment plan.
- Income-driven repayment forgiveness — any remaining balance is forgiven after 20-25 years of qualifying payments on an income-driven plan, regardless of employer.
- Teacher Loan Forgiveness — up to $17,500 forgiven for qualifying teachers in low-income schools after five consecutive years of service.
The common thread: forgiveness requires years of documented, qualifying payments on the correct repayment plan. Missing a step, switching plans incorrectly, or misunderstanding "qualifying employment" is the most common reason people expect forgiveness and don't get it.
Refinancing federal loans: know what you're giving up
Refinancing (usually through a private lender) can lower your interest rate if your credit and income have improved since you originally borrowed. But refinancing a federal loan into a private one is permanent and forfeits every federal protection: income-driven repayment, forgiveness program eligibility, deferment options, and the fixed-by-law interest rate. This trade-off can make sense for someone who's certain they won't need those protections and can lock in a meaningfully lower rate — but it's not reversible once done.
What happens if you default
Federal loans are considered delinquent the day after a missed payment and typically default after 270 days (about 9 months) of non-payment. Default triggers serious consequences: the full balance becomes due immediately, wage garnishment and tax refund seizure become possible without a court order, your credit score takes a severe hit, and you lose eligibility for deferment, forbearance, and additional federal aid. Private loan default timelines and consequences vary by lender but are generally faster and can include lawsuits from the lender. If payments become genuinely unaffordable, switching to an income-driven plan or requesting deferment is almost always a better option than letting a loan lapse into default.
Should you pay extra toward student loans?
This depends on a few factors that don't have a universal answer:
- Interest rate — a 3-4% federal loan is a very different decision than a 9-11% private loan.
- Forgiveness eligibility — if you're pursuing Public Service Loan Forgiveness or another forgiveness track, paying extra can actually work against you by shrinking the balance that would otherwise be forgiven.
- Other debt — high-interest credit card debt should almost always be paid off before extra payments go toward lower-rate student loans.
- Emergency savings — build at least a partial cushion before aggressively prepaying any fixed-rate, relatively low-interest debt.
This article is general information, not financial advice. Federal loan programs and rates change over time — check studentaid.gov for current, authoritative terms.