Finance guide
Mortgage Refinance: When Break-Even Makes It Worth It
Compare your current loan with a refinance by total cost, monthly savings, and the break-even point — the months until savings exceed closing costs.
Written by James — Founder & Builder, BoringToolsKit · Published 2026 · Planning information, not professional advice.
What refinancing actually changes
A refinance replaces your current mortgage with a new loan at a new rate, term, and closing costs. The benefit comes from a lower rate or a shorter term; the cost is the fees and points paid upfront. The decision is a math problem: does the monthly saving, over the time you will stay in the home, exceed the cost of getting the new loan?
The break-even formula
Break-even months equal total closing costs divided by monthly savings. If closing costs are $6,000 and the new payment saves $150 monthly, break-even is 40 months. Stay in the home longer than that and the refinance pays; sell earlier and it loses. The calculator shows this number explicitly.
Rate changes are the main driver
A 1-percentage-point drop on a $300,000 30-year mortgage at 6.5 percent cuts the principal-and-interest payment from about $1,896 to about $1,763 — roughly $133 monthly, about $1,600 per year. That kind of saving justifies meaningful closing costs; a 0.25-point drop usually does not.
Watch out for the resets
Refinancing into a new 30-year term restarts the amortization clock, so you may pay more total interest even with a lower payment. Compare total interest as well as monthly payment, and consider a 15-year or 20-year term if the goal is paying the loan off faster.
Include the real closing costs
Loan origination, appraisal, title, and recording fees typically run 2 to 5 percent of the loan. Some lenders advertise no-closing-cost loans by folding the fees into the rate — compare the all-in cost, not the headline payment. The calculator accepts your actual cost estimate so the break-even is personal.
The break-even decision rule
Compare break-even months with your expected time in the home. If you plan to stay 5 years and break-even is 40 months, the refi wins. If you may move in 2 years, it loses regardless of the rate. The horizon question matters more than the rate question for most borrowers.
Cash-out refinances are a different trade
A cash-out refinance trades home equity for cash at mortgage rates — often cheaper than credit cards but still debt secured by your home. The break-even math covers the rate and fees, but the decision also needs a plan for the cash. The calculator treats the loan comparison honestly; the use of the proceeds is on you.