π Refinance Break-Even Calculator
When does refinancing actually pay for itself, fees included?
Your Current Loan
The New Loan
Months to Break Even
Estimates for planning only, not financial advice.
How to Use This Calculator
Enter your current loan on the left side and the refinance offer on the right. If you leave Current Monthly Payment blank, the calculator computes it from your balance, rate, and years remaining. The verdict tells you whether the refinance is worth it, and warns you about the term-reset trap.
Enter your Current Balance, Current APR, and Years Remaining. Leave Current Monthly Payment blank unless your actual payment differs (for example, you pay extra each month).
Enter the New APR, New Term in years, and total Closing Costs from the lender's Loan Estimate.
Read the verdict: break-even months, monthly savings, and the lifetime cost of each option side by side.
If the term-reset warning appears, try a shorter New Term that matches your remaining years and watch the lifetime cost flip.
The Break-Even Formula
The break-even point answers "when am I finally ahead?" But it is only half the story. Two loans with the same payment can have wildly different total costs when their terms differ. The honest comparison is lifetime cost: what you will have paid in total, fees included, if you keep each loan to the end. A refinance wins only if it lowers lifetime cost, or if you value the lower monthly payment enough to accept a higher lifetime cost.
Worked Example: The Term-Reset Trap
$300,000 balance, 7.5 percent APR, 25 years remaining. Current payment = 300000 x 0.00625 x (1.00625)^300 / ((1.00625)^300 - 1) = $2,216.97. New offer: 6.25 percent, 30 years, $6,000 closing. New payment = $1,847.15. Monthly savings = $369.82. Break-even = 6000 / 369.82 = 16.2 months, about a year and a half. Looks great, right?
Now the lifetime view. Staying: $2,216.97 x 300 = $665,092.06. Refinancing: $1,847.15 x 360 + $6,000 = $670,974.58. The refinance costs $5,882 MORE overall, because a fresh 30-year term adds 5 years of payments at the new rate. The payment drops, but the clock restarts. Choosing a 25-year term at 6.25 percent instead gives a payment of $1,943.32 and a lifetime cost of $588,996, which genuinely saves money. Same rate, different term, opposite verdict.
When Refinancing Is Worth It
Refinancing shines in three situations: rates have dropped a full point or more since you borrowed, your credit score has improved enough to unlock a much better rate, or you want to switch from an adjustable rate to a fixed one before it resets. It is weakest when your balance is small, when you plan to move within a few years, or when the new term stretches your debt further into the future than the old one. In every case, get the Loan Estimate in writing, confirm which fees are lender fees you can negotiate, and run the numbers here before you sign.
Estimates for planning only, not financial advice.
Frequently Asked Questions
What is the break-even point on a refinance?
The break-even point is the month when your accumulated monthly savings finally exceed what you paid in closing costs: break-even months = closing costs / monthly savings. Until that month you are still in the red on the deal. This calculator shows it alongside the full lifetime cost comparison, because a fast break-even does not always mean the refinance is a good deal.
When is refinancing a bad idea?
It is a bad idea when you plan to move or sell before the break-even point, when the new payment is barely lower, or when a longer new term makes the total lifetime cost higher than staying put. It is also weak when closing costs are rolled into the loan, since you then pay interest on the fees too. Always compare lifetime cost, not just the monthly payment.
Which closing costs are negotiable?
Origination fees, lender credits, and discount points are the most negotiable: lenders compete on these. Third-party costs like appraisal, title insurance, and recording fees vary less but can still be shopped. Ask for a Loan Estimate from at least three lenders and negotiate line by line. A "no-closing-cost" refinance usually just means a higher rate instead, so run both through the calculator.
Does refinancing restart the clock on my loan?
Yes, and this is the trap most people miss. Refinancing a 25-years-remaining loan into a fresh 30-year loan can lower the payment while increasing the total amount you pay, because you add 5 extra years of interest. The worked example below shows a refinance that breaks even in 17 months yet costs $5,882 MORE over its lifetime. If you refinance, consider a term that matches or beats your remaining years.
How much lower does the rate need to be?
The old rule of thumb was 1 percent, but the real answer depends on your balance, remaining term, and closing costs. On a large balance with many years left, even a 0.5 percent drop can be worth it; on a small balance near payoff, even 1.5 percent may not cover the fees. Put your exact numbers in above and let the break-even math decide.