Understanding your student loan payments
Student loans confuse people because the "right" payment depends on the plan you choose — and the plans optimize for very different things. Here's how repayment actually works, and how to see what each option costs you.
Reviewed by Robert · Updated June 2026
The two ways to repay
Most federal repayment plans fall into two camps:
- Standard / fixed plans — a set payment that pays the loan off in a fixed term (commonly 10 years). Higher monthly payment, but the lowest total interest and a clear end date.
- Income-driven repayment (IDR) — your payment is capped at a percentage of your discretionary income and stretched over a longer term, with remaining balances potentially forgiven after many years. Lower monthly payment, but usually more total interest.
Neither is "better" in the abstract — IDR is a lifeline when payments are unaffordable, while a standard plan saves money if you can manage it. The U.S. Department of Education's Federal Student Aid site is the authoritative place to compare official plans and forgiveness rules. (studentaid.gov: Repayment plans.)
How interest quietly grows the balance
Interest accrues daily on your principal. The trap with low-payment plans is that if your payment doesn't cover the interest, the unpaid interest can be added to your balance — and you start paying interest on interest. That's why two people with the same loan can pay wildly different totals depending on plan and how fast they pay.
The levers that change your payment
- Balance — what you owe today across all loans.
- Interest rate — fixed for federal loans; varies for private.
- Term — longer term lowers the payment but raises lifetime interest.
- Extra payments — anything above the minimum goes to principal and compounds in your favor.
A quick worked example
On a $35,000 balance at 6%:
- Standard 10-year: about $389/mo, roughly $11,600 total interest.
- Stretched to 20 years: payment drops to around $251/mo — but total interest more than doubles to about $25,200.
Same loan, ~$14,000 difference — entirely from the term. Seeing that gap is usually what motivates people to add even a little extra each month.
Smart moves
- Pay more than the minimum when you can — every extra dollar hits principal directly.
- Use IDR if payments are unaffordable, not as a default — it protects you, but costs more over time.
- Be cautious refinancing federal loans into private ones — you may get a lower rate but lose federal protections like IDR and forgiveness.
CapitalCalcs provides educational estimates, not financial advice. Official plan terms and forgiveness rules change — always confirm specifics at studentaid.gov or with your loan servicer. See how we calculate.