Fixed vs Variable Student Loan Refinance Break Even
This calculator identifies the month when the cumulative cost of a variable-rate refinance exceeds the cumulative cost of a fixed-rate refinance on the same balance. Enter your balance, both rate offers, a rate-rise scenario, and your term. The crossover month tells you how long the variable rate stays cheaper before the fixed rate becomes the better deal.
In this scenario you save
Difference between the two
by taking the variable rate — even after it rises to in .
by taking the fixed rate. The rise you modelled wipes out the variable loan's head start.
The two land within a dollar of each other on these numbers.
- Over FixedVariable
- Payment at the start
- Payment after the rise
- Interest paid
- Total paid
The variable loan stops being the cheaper one once the rate climbs past at that same month.
The variable loan is modelled the way lenders handle a rate change: the remaining balance is re-amortised over the remaining term at the new rate, so the payment jumps by . Real variable rates move more than once and have their own caps — check the loan agreement.
How the Crossover Month Is Calculated
The calculator runs two parallel amortization schedules. The fixed-rate schedule stays constant: the same payment every month for the full term. The variable-rate schedule starts lower and then increases according to the rate path you define. Each month, the tool calculates the cumulative interest paid under both scenarios. The crossover month is the point where the variable scenario's cumulative interest overtakes the fixed scenario's.
Before the crossover, the variable borrower has paid less in total interest. After it, the variable borrower has paid more. If the crossover falls after your planned payoff date, the variable rate wins. If it falls before, the fixed rate wins. On an illustrative $75,000 balance where the variable starts one point below the fixed and rises half a point per year, the crossover may arrive around month 30 to 40 depending on the term. Enter your actual rate offers and a realistic rate-rise path to see where the crossover falls for your loan. The result helps you decide which offer to accept based on how long you plan to stay in the loan.
Why Your Holding Period Is the Key Variable
Borrowers who plan to pay off or refinance again within three to five years face limited rate-rise exposure. For them, the variable-rate discount is likely to survive the holding period, and the crossover month may never arrive. Borrowers on seven-year or longer terms face the opposite risk: rates have more time to climb, and the crossover can arrive well before the loan is paid off.
The calculator lets you adjust the holding period separately from the loan term. If you plan to make extra payments and finish in six years on a ten-year term, enter six years as the holding period to see whether the crossover falls within your actual repayment window. Refinancing federal loans into either a fixed or variable private loan permanently eliminates access to IDR, PSLF, forbearance, and disability discharge. For a broader fixed-vs-variable comparison without the break-even focus, see the rate comparison page. For a general refinance break-even that factors in closing costs, use the refinance break-even calculator.
Rate scenarios are illustrative. Actual variable rate movement depends on SOFR and lender margin. This tool does not predict future rates.
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Related student loan calculators
- Fixed vs Variable Student Loan Refinance Rates
- Should I Refinance My Variable Rate Student Loan?
- Student Loan Refinance Break Even Calculator
Sources
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Sources: SOFR benchmark (newyorkfed.org); standard dual-amortization comparison math; credible.com refinance rate-band data.
- Federal Direct Consolidation Loan interest rate — the weighted average of the loans being consolidated, rounded up to the nearest one-eighth of one percent (Federal Student Aid, studentaid.gov, Loan Consolidation).
- Amortisation, daily interest accrual and payoff arithmetic — standard loan mathematics; every figure on this page is computed from the numbers you enter.