How to Calculate Your Refinance Break-Even
What it is
The break-even point is the moment when the money you’ve saved from a refinance finally equals the money it cost you to refinance. Up to that point, the refinance hasn’t paid for itself; past it, the ongoing savings are yours to keep. It’s the single most useful number for judging whether a rate-lowering refinance is worthwhile.
When would a refinance pay for itself?
Break-even is simply your refinance costs divided by your monthly savings. If you'd move or sell before then, the refinance may not pay off. This is educational, not a recommendation.
How it works
The formula is straightforward:
Break-even (in months) = Total refinance costs ÷ Monthly savings
- Total refinance costs are the closing costs of the new loan — appraisal, title, origination (the lender’s setup fee), and related fees — commonly around 2–5% of the loan amount.
- Monthly savings is your old monthly payment minus your new monthly payment, comparing like for like.
The result tells you how many months you must keep the new loan before the savings outrun the cost.
🧮 A worked example (hypothetical, round numbers)
For example, suppose refinancing costs $6,000 in total, and the new loan lowers your payment by $200 per month:
$6,000 ÷ $200 = 30 months
So it would take 30 months — two and a half years — of the lower payment just to recover the $6,000 spent. If you sell or move before month 30, you’d lose money on the refinance. If you stay well beyond it, the $200/month becomes genuine ongoing savings.
(These figures are illustrative only — not current rates or fees.)
What affects it / How to think about it
- Higher costs push the break-even further out. Rolling fees into the balance can hide them, but they still count.
- Smaller monthly savings push it further out too. A refinance that trims only a little off the payment can take many years to break even.
- The single biggest factor is how long you’ll stay. Break-even is only meaningful next to your expected time in the home. A 30-month break-even is comfortable if you plan to stay a decade; it’s risky if you might move in two years.
- Watch out for a longer term. If a refinance lowers the monthly payment mainly by stretching the loan back out to 30 years, the monthly “savings” can be misleading — you may pay more total interest over time even after breaking even. Compare total interest, not just the monthly number.
- The lock-in caveat. If you already hold a low fixed rate from a prior year, refinancing at a higher current rate would produce negative monthly savings — the payment would rise — and there is no break-even at all. Break-even math only applies when the new rate is meaningfully below your current one after costs.
The CFPB frames break-even as the core test for a rate-and-term refinance: compare total costs against how long you plan to keep the loan.
Break-even turns a refinance from a gut feeling into a number you can check. To reason about it: add up every cost, find the true monthly savings, divide the first by the second, and compare the resulting months against how long you realistically expect to stay in the home. If you’d comfortably clear the break-even point with years to spare, the math is favorable; if you might leave before then, it likely isn’t. Whether to proceed is your decision — the calculation simply shows you where the line sits.