Compare repayment plans and see the impact of making extra payments on your student loan payoff timeline and total interest.
Student loan interest accrues daily on your remaining principal. Every extra dollar you pay reduces that principal, which means less interest accumulates the following day — and every day after. Small additional payments compound into large savings over a 10-year repayment window.
On a $35,000 loan at 6.39%, an extra $100 per month saves roughly $2,800 in interest and pays the loan off about 2 years early. An extra $200 per month saves over $4,500 and cuts nearly 4 years off the term.
This is the most common mistake borrowers make: sending extra money without specifying how it's applied. By default, many loan servicers apply extra payments to your next scheduled payment rather than to principal reduction. That means your next due date moves forward, but your principal barely budges.
To make extra payments count, contact your servicer (online or by phone) and specify that overpayments should be applied to principal. Some servicers let you set this as a permanent preference. Always confirm it's working by checking your principal balance after a payment posts.
| Plan | Term | Monthly Payment | Total Paid |
|---|---|---|---|
| Standard | 10 years | $389 | $46,700 |
| Extended | 20 years | $261 | $62,700 |
| Extended | 25 years | $233 | $70,000 |
Based on $35,000 at 6.39%. Extending from 10 to 25 years saves $156/month but costs an extra $23,000 in interest over the life of the loan.
Extra payments make the most sense when: your loan interest rate is higher than what you'd earn investing the same money, you have no high-interest debt (like credit cards) that should be paid first, and you have a basic emergency fund in place.
If you have federal loans and are pursuing Public Service Loan Forgiveness (PSLF), extra payments can actually hurt you — PSLF forgives your remaining balance after 10 years of qualifying payments, so paying down principal faster means you get less forgiven. In that case, pay the minimum and let forgiveness do the work.
If your standard monthly payment is unmanageable relative to your income, income-driven repayment (IDR) plans cap your payment at a percentage of discretionary income. The Saving on a Valuable Education (SAVE) plan replaced REPAYE in 2023 and offers the lowest payments for most borrowers. After 20–25 years of qualifying payments, remaining balances are forgiven — though that forgiveness may be taxable income.
Private lenders sometimes offer lower interest rates for refinancing federal loans. The catch: refinancing converts your federal loans permanently into private loans. You lose access to income-driven repayment, Public Service Loan Forgiveness eligibility, deferment and forbearance options, and all other federal borrower protections. Even a lower interest rate rarely compensates for these losses — especially if there is any chance you might need IDR or pursue PSLF in the future. Refinancing private loans (not federal) into a lower-rate private loan can save money; refinancing federal loans is almost never advisable.
On a $40,000 loan at 6.39% over 10 years, the standard monthly payment is about $450 and total interest is roughly $13,900. Adding $100/month extra saves approximately $2,800 in interest and pays the loan off about 18 months early. Adding $200/month saves approximately $4,600 and cuts nearly 3 years off the term. The key is ensuring extra payments are applied to principal — contact your servicer to confirm this, as some apply overpayments to future scheduled payments by default.
Student Loan Calculator — monthly payment and total cost for any loan amount.
Student Loan Repayment Plans (2026) — compare Standard, IBR, SAVE, and PSLF.
Federal vs Private Student Loans — which to borrow and repay first.
How Much Student Loan Debt Is Too Much? — the 1x salary rule explained.