The standard plan, and what it costs
Federal student loans default to a ten-year standard repayment plan with a fixed monthly payment. On a $35,000 balance at 6%, that payment is about $389 a month and total interest comes to roughly $11,629.
Extended plans of 15, 20, or 25 years lower the monthly payment substantially, which is genuinely useful when money is tight. The cost is that you pay considerably more interest overall and stay in debt for decades. Switching from a 10-year to a 25-year term on the same balance more than doubles the interest.
Adding just $100 a month to the standard payment clears the loan in 89 months instead of 120 — two and a half years early — and saves about $3,188 in interest. Extra payments early in the term are worth far more than the same amount later, because they eliminate every future interest charge that balance would have generated.
Make sure extra payments go where you want
This is the most common and most costly mistake in student loan repayment. By default, many servicers apply an overpayment to *next month's* payment rather than to the principal. You get a paid-ahead status instead of a smaller balance, and you save almost nothing.
You generally have to instruct the servicer explicitly — in writing, and sometimes repeatedly — to apply extra amounts to principal. Then check the next statement to confirm they did.
If you have several loans at different rates, also specify *which* loan the extra should go to. Servicers typically spread overpayments proportionally across all loans, which is worse than directing everything at the highest-rate loan first.
The 8% guideline
A commonly cited benchmark is that student loan payments should stay under about 8% of gross income. In the default scenario, a $489 payment on a $60,000 salary is roughly 9.8% — slightly above the guideline, which is a signal the debt load is heavy relative to earnings.
This benchmark is most useful *before* borrowing. A rough version: try not to borrow more in total than your expected first-year salary. Graduating with $35,000 of debt into a $60,000 job is manageable. The same debt into a $30,000 job is not, and the difference is not effort.
If you are already above the guideline, income-driven repayment plans cap payments at a percentage of discretionary income. They cost more in interest over time, but they exist precisely for this situation and are far better than default.
Before you refinance federal loans
Refinancing to a private lender can lower your rate meaningfully, particularly if your credit and income have improved since you borrowed. But refinancing a federal loan into a private one permanently forfeits federal protections, and that is irreversible.
You would give up income-driven repayment, which caps payments when income falls. You would give up federal deferment and forbearance options during unemployment or hardship. You would give up eligibility for Public Service Loan Forgiveness. And you would give up any future federal relief programmes.
The calculus is roughly this: refinancing makes sense for high-earning borrowers with stable employment in the private sector, where the protections are unlikely to be needed and the rate reduction is substantial. It is usually a poor trade for anyone in public service, with variable income, or in a field where layoffs are common.
Private loans carry none of these protections to begin with, so refinancing those is a straightforward rate comparison.
Frequently asked questions
- Should I pay off student loans or invest?
- Compare the loan rate against your expected after-tax investment return. Below about 5%, investing usually wins on expected value. Above 7%, paying down the loan is competitive and carries no risk. Always capture a full employer 401(k) match first regardless.
- What rate should I enter if I have multiple loans?
- Use a weighted average — multiply each balance by its rate, add those together, and divide by the total balance. For a more precise plan, run each loan separately.
- Does paying extra reduce my monthly payment?
- No. On a standard plan the payment stays fixed and extra payments shorten the term instead. This is what makes them effective — you are removing months of future interest, not reducing the current bill.
- Is student loan interest tax deductible?
- In the US you may deduct student loan interest up to an annual limit, subject to income phase-outs, and you can claim it without itemising. The thresholds change, so check current IRS guidance.