How US student loans work
What you'll learn
Know the difference between federal and private student loans, how interest accrues, and why federal protections matter before refinancing.
Every US student loan is one of two kinds, and the difference matters more than the interest rate: federal loans come with borrower protections written into law, while private loans are ordinary bank contracts that give you only what the small print says.
How the interest works
Interest on student loans typically accrues daily on your outstanding balance. On many loans it starts building while you are still studying, and unpaid interest can be added to the balance itself. That is why the balance can grow even before your first payment, and why paying extra shrinks the total cost: a smaller balance accrues less interest every single day.
Repayment: two broad paths
| Path | How the payment is set | Where it exists |
|---|---|---|
| Standard repayment | Fixed monthly amount that clears the loan on a set schedule | Federal and private |
| Income-driven repayment (IDR) | Payment based on your income and family size | Federal only |
Income-driven repayment exists, and that is the headline: if your income drops, a federal loan can drop its payment with you. The specific plans, formulas and forgiveness rules change frequently, so do not memorise figures; check the current options on studentaid.gov.
Why protections matter before refinancing
Refinancing swaps your loan for a new private one at, hopefully, a lower rate. For a private loan that can be a straight win. For a federal loan it is a one-way door: you permanently trade away income-driven repayment, hardship deferment and any forgiveness routes for that rate cut. If your income is uncertain, the protections are usually worth more than the saving.
Key takeaways
- The federal vs private distinction is the one that matters: legal protections vs a bare contract.
- Interest accrues daily on the balance, so extra payments cut the lifetime cost.
- Income-driven repayment exists on federal loans; the rules change, so check studentaid.gov.
- Refinancing a federal loan into a private one permanently gives up the protections.
Illustrative only: a made-up $30,000 loan at 6% on a 10-year schedule, versus the same loan with an extra $100 paid each month. Real loans differ by rate, term and plan. Not a forecast or advice.
Frequently asked questions
What is the main difference between federal and private student loans?
Federal loans come from the US government with borrower protections written into law, such as income-driven repayment and hardship options. Private loans are ordinary contracts with a bank or lender, and you only get whatever the contract offers.
What is income-driven repayment?
A family of federal repayment plans that set your monthly payment from your income and family size rather than your balance. The specific plans and their rules change often, so check the current options on studentaid.gov.
Does interest build while I am still studying?
On many loans, yes. Interest can accrue from the day the money is paid out, and unpaid interest may be added to your balance later. The exact treatment depends on the loan type, so check your loan terms.
Is refinancing student loans ever a good idea?
It can cut the rate on private loans. The trap is refinancing federal loans into a private loan, which permanently gives up income-driven repayment and other federal protections in exchange for a rate cut. Weigh that trade carefully before signing.
General information, not financial advice. The value of investments can fall as well as rise, and figures and rules can change; check the current position before acting.