Should you pay off student loans early?
The math favors early payoff when your loan rate exceeds what you could reasonably earn after tax and fees on an investment. With federal undergraduate rates at 6.53% in 2026, most broad-market index funds would need to return more than 8–9% (before taxes) to come out clearly ahead — and that's not guaranteed.
Early payoff also has a psychological return that doesn't show up in spreadsheets: the reduction in financial anxiety, the flexibility that comes from having no mandatory payment, and the capacity to take career or life risks you couldn't take while servicing debt.
The one exception is if you're on track for PSLF. If you qualify, paying down the loan early is counterproductive — smaller balances mean smaller forgiveness. In that case, make the minimum qualifying payment, invest the difference, and let the forgiveness come.
Federal vs. private — what changes the math
Federal loans carry fixed rates set annually by Congress based on 10-year Treasury yields. Private loan rates are risk-based — excellent credit and income can get you sub-5% rates; average credit can push you above 10%. The gap in raw rate is only part of the story.
Federal loans include deferment and forbearance rights, income-driven repayment, PSLF eligibility, and death and disability discharge. Private loans offer none of these automatically. A private loan with a 4.5% rate looks better than a federal loan at 6.5% — until you lose your job and discover you have no deferment option.
The practical rule: max out federal borrowing before taking any private loans. If you have both, consider keeping federal loans as-is while aggressively paying down private loans first.
Income-driven repayment vs. aggressive payoff
Income-driven repayment makes sense when your loan balance is high relative to your income. If you owe $120,000 and earn $55,000, a standard 10-year payment would consume nearly a quarter of your gross income. IDR reduces that to a manageable 5–10%.
The trade-off: you may pay for 20–25 years instead of 10, and you'll pay more total interest unless forgiveness actually kicks in. If your income grows significantly over time, IDR payments grow too — and you may pay off the loan in full before any forgiveness.
Aggressive payoff works best when your balance is small relative to your income, your loan rate is high, and you have a stable enough income to sustain larger payments. Use this calculator to model both paths: set the term to 25 years to approximate IDR, then try 5–10 years with extra payments to see the aggressive-payoff scenario.
When refinancing actually helps
Refinancing is worth modeling when: (1) you have private loans at rates above 7–8%, (2) your credit score has improved since you borrowed, and (3) you have stable income and no need for federal protections. Rates for borrowers with 750+ credit scores and solid income often come in 1.5–2.5 points below what they originally borrowed at.
Use this calculator's "interest savings" output on your current loan, then run the same numbers at the refinanced rate. The difference is your lifetime saving from refinancing, which you can then weigh against the loss of federal protections.
Never refinance federal loans if you're pursuing PSLF, if your income is variable, or if you're on an IDR plan that keeps payments affordable. The forgone protections are worth far more than the interest savings in those cases.
Common student loan mistakes
- Making extra payments without specifying "apply to principal" — servicers may apply it as a future payment instead.
- Refinancing federal loans before confirming you don't qualify for PSLF.
- Ignoring capitalization — missing even one interest payment in deferment adds to your principal permanently.
- Choosing a 25-year term to lower payments without modeling total interest: you often pay 2–3x the principal in interest.
- Not claiming the student loan interest deduction (up to $2,500/year) — an above-the-line deduction most borrowers miss.
- Deferring without understanding that unsubsidized loan interest keeps accruing and will capitalize.
