Student Loan Repayment Calculator

A fixed payment never changes size, but what it buys shifts every month. Interest on the remaining balance gets paid first; only the leftover reduces principal. At the start, when the balance is largest, interest takes the biggest cut. On a $35,000 loan at 5.5% over 10 years, the first $380 payment sends about $160 to interest and $220 to principal. By the start of year nine the balance is down near $8,600, and the same payment splits roughly $40 to interest and $340 to principal. That front-loading is the whole argument for paying extra early: a dollar of principal knocked out in year one stops interest from compounding on it for the next nine years, while a dollar in year nine barely has time to matter.

Every federal fixed-payment option is a trade between the monthly bill and the lifetime cost. Take $45,000 at 5.5%. The standard 10-year plan runs $488 a month with about $13,600 in total interest. The extended 25-year plan cuts the payment to $276 but pushes interest to roughly $37,900, nearly triple the standard figure for a $212 monthly discount. The graduated plan splits the difference in a different way: it keeps the 10-year window but starts low and steps the payment up every two years, which suits someone early in a career with a believable raise trajectory. Extended repayment is limited to borrowers with more than $30,000 in Direct Loans.

A faster payoff comes from one mechanism: shrinking the balance that next month's interest is charged on. With several loans, the avalanche order does that most efficiently. Pay minimums on everything, aim spare cash at the highest rate, and roll the freed-up payment to the next loan once the first is gone. The snowball order clears the smallest balance first instead. It costs a bit more in interest but some people stick with it better, and a method you keep beats a method you abandon. Two quieter tactics work on a single loan. Paying half your monthly amount every two weeks produces 26 half-payments a year, which is 13 full payments instead of 12; on a $35,000 loan at 5.5% that habit saves about $1,100 in interest and shortens the term by roughly a year. A one-time $1,000 windfall applied in year one saves around $600 over the life of the same loan. In every case, confirm with your servicer that the surplus reduces principal rather than prepaying your next bill.

When unpaid interest capitalizes, it joins your principal and starts generating interest of its own. The usual triggers are leaving a deferment or forbearance and certain plan changes. The dollars are not small. Park a $40,000 loan at 6% in forbearance for three years and about $7,200 of interest accrues; if it capitalizes, your balance becomes $47,200 and every later payment covers a bigger interest charge. Covering just the interest during a pause, about $200 a month in that example, holds the balance flat and avoids the whole problem. Rules on which events trigger capitalization have shifted in recent years, so if you are heading into a pause, ask your servicer exactly what happens to accrued interest when it ends.

Instead of amortizing the balance over a set term, an income-driven plan charges a percentage of what you earn above a protected amount and forgives whatever remains after a set number of years of qualifying payments. That structure fits borrowers whose balance rivals or exceeds their annual income, and it can produce a $0 payment during a stretch of low earnings. The cost of the breathing room is time and interest: small payments let the balance linger, and unless forgiveness ultimately wipes it, the loan costs more than it would on the standard plan. The plan lineup itself has been unsettled since 2023, with court challenges and new legislation reshaping which plans accept new enrollees and on what terms. Do not build a long-term plan around a specific formula you read somewhere; check studentaid.gov for the current menu before you commit.

A private refinance can genuinely cut your rate, and for loans that are already private there is little downside beyond the paperwork. Federal loans are a different decision. The moment a federal loan is refinanced into a private one, income-driven repayment, federal forgiveness programs, and federal deferment and forbearance are gone for good, and no later change of heart brings them back. Strong candidates have stable income, a real emergency fund, no public service plans, and an offer at least a point and a half below their current rate. Everyone else usually keeps more value in the federal system than a rate cut would return.