Mortgage Refinance Break-Even Calculator: Compare Old and New Payments

A mortgage refinance lowers (or raises) your monthly payment in exchange for closing costs paid up front. The decision turns on a single arithmetic question: how many months of payment savings does it take to recover those closing costs? If you plan to keep the loan longer than that break-even, refinancing usually saves money. If you might sell, move, or refinance again before then, it usually doesn’t.

This calculator compares your current loan with a new offer, shows the monthly payment difference, divides closing costs by monthly savings, and warns you if your planned sale or next refinance comes before the break-even point. The chart visualizes cumulative savings net of closing costs over time.

The standard break-even calculation is straightforward: total refinance closing costs divided by the monthly principal-and-interest savings between the old and new loans. If your new loan saves $250 a month and the refinance costs $6,500 to close, the simple break-even is 26 months. After month 26 every additional payment saved is a net gain.

This calculator uses that simple model on purpose. Some online calculators add tax-deduction adjustments, opportunity-cost discount rates, or amortization-aware accounting for the larger principal balance early in the new loan. Those refinements matter at the margin, but they don’t change the basic question of whether your timeline beats the simple break-even.

Federal Truth-in-Lending rules require every lender to deliver a Loan Estimate within three business days of an application. The CFPB’s page on the Loan Estimate shows the exact form. Pull closing-cost totals from there — not from advertised “average” numbers — for the most accurate break-even calculation.

Closing costs typically run 2–5% of the new loan amount. They include lender origination, appraisal, title and settlement, recording, prepaid interest, and the funding of the new escrow account. Some of these are negotiable (or shoppable), and some are not. The Loan Estimate splits them into three buckets so you can see which is which.

The most common silent mistake in refinancing is rolling 22 years remaining on a 30-year loan into a brand-new 30-year loan. The new monthly payment is lower — but the timeline extended by 8 years, and total interest paid often goes up even at a lower rate.

If your goal is total-cost reduction, ask the lender to quote the refinance at a term that doesn’t extend your existing schedule (e.g., a new 20-year loan to replace 22 years remaining on the original 30-year). The monthly payment may not drop as much, but the total interest savings can be much larger.

The calculator asks for your planned timeline in years for a sale, payoff, or next refinance. If that number is shorter than the calculated break-even months, the calculator surfaces a warning. The economic interpretation is simple: you would pay the closing costs once and only partially recover them through monthly savings before the loan goes away.

Job moves, marriage and divorce, deaths and births, and unforeseen relocations all shorten loan timelines. A conservative rule for borrowers who aren’t certain of their five-year plan is to refinance only when the break-even comes inside 36 months — that leaves a buffer for life happening.