A refi email hit my inbox: “Save $210/month!” Buried twelve lines down: $6,400 in costs and a fresh 30-year tape measure. Saving monthly cash today can still mean paying more wood over the life of the loan. Break-even is the adult version of reading past the subject line.
The only break-even that matters on closing day
Take closing costs you truly won’t recover immediately (points, title, origination—whatever is real in your quote). Divide by the monthly payment drop on the part you care about—usually P&I if you are comparing apples to apples. That’s months to get your cash back. If you might sell before then, the refi math gets mushy fast.
Numbers: $6,200 costs, $185/mo P&I savings
$6,200 ÷ $185 ≈ 33.5 months to recover hard dollars. Under three years. Sounds fine—unless you’re listing in eighteen months because of a job change. Also check whether the “savings” assumed you rolled costs into the loan (you still borrowed them).
Model your actual balance, remaining term, new rate, and costs in the refinance break-even calculator. Pair it with the mortgage payment calculator if you want the post-refi housing cash picture with escrow lines.
FAQ
Should I always choose the lowest rate?
APR helps because it folds some lender fees into the story. Two rates with different costs aren’t comparable on the headline alone.
What about cash-out?
You’re borrowing more. Payment might still drop if the rate craters, but you’re not “saving” on the chunk you took out—you’re financing it.