Student Loan Payoff Calculator

Are you aiming for forgiveness? If you are working toward Public Service Loan Forgiveness or a forgiveness endpoint under an income-driven plan, extra payments actively work against you — every dollar you add reduces a balance that was going to be written off. In that case the optimal payment is the required one, and the money is better placed elsewhere. Everything below assumes you are paying the loans off yourself.

Extra payments have real leverage here. Unlike a car loan, the standard student loan term is ten years and many borrowers are on twenty or twenty-five year plans. That length is exactly what gives extra principal time to compound against the balance, which is why a modest amount moves the payoff date by years rather than months.

Target the highest rate, not the biggest balance. Most borrowers hold several loans at different rates disbursed across different years. Servicers usually spread extra payments evenly across all of them by default, which is the one distribution nobody would choose deliberately. Name the specific loan in writing, and pick the one with the highest rate.

Take $35,000 at 6.5% on the standard 10-year plan. The scheduled payment is $397 a month, and following the schedule costs $12,690 in interest — $47,690 in total for $35,000 borrowed. Here is what four approaches produce:

The third row is the one worth dwelling on, because the timing is doing most of the work. That $5,000 saves $3,966 paid today. Hold the same $5,000 for three years and pay it in month 37, and it saves $2,459 — about $1,500 less for identical money. Waiting to accumulate a satisfying round number is itself expensive.

Below the 401(k) match and credit cards. An employer match is an immediate 50–100% return and card debt at 20–25% costs three to four times a typical student loan rate. Both beat extra principal at 6.5% by a wide margin. Capture the match, clear the cards, then come back to this page.

Above almost nothing else, and that is the point. Once the expensive debt is gone, a 6.5% guaranteed return is genuinely competitive with a long-run stock market expectation and comes with no variance at all. Below about 4%, the argument flips and investing the difference usually wins.

Federal protections have real value. Income-driven repayment, deferment, forbearance, and death or disability discharge are insurance you already own. Aggressively clearing federal loans is fine; refinancing them away to shave a point is a different trade, and one that cannot be reversed if your income drops.

These figures assume a fixed rate and a balance with no capitalised interest pending — if you are leaving a grace period, deferment, or an income-driven plan, unpaid interest may be added to principal first, which raises the balance this calculator should start from. Compare paying extra against investing the same money with the compound interest calculator.