A lower rate looks great on paper — but closing costs come first. Find out exactly how many months it takes before refinancing starts saving you money.
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When does refinancing pay for itself?
Enter your current loan and the refinance offer. The timeline shows the moment your monthly savings finally recover the closing costs.
How it works: each loan's payment comes from the amortization formula; monthly savings = current payment − new payment; break-even = closing costs ÷ monthly savings. The timeline tracks your net position month by month — starting $8,000 in the hole (the fees), climbing with every month's savings, and crossing zero at the break-even point. Keep in mind the current loan's savings stop when it would have been paid off.
How the refinance break-even works
Refinancing starts with a loss: the closing costs leave your pocket on day one. The win comes later, in smaller monthly payments. The break-even point is simply the month where those accumulated savings finally catch up to the fees. Everything after that month is profit — everything before it, you're still recovering the cost of the deal.
Run the payment formula twice — once for the loan you have, once for the loan you're offered — and the difference is your monthly savings. Divide the closing costs by that number. The answer is the number of months you must keep the new loan before it has truly paid for itself.
Worked example: $300,000 mortgage, 7.25% → 6.25%
The current loan ($300,000 at 7.25%, 25 years left) costs $2,168.42 a month — $650,526 all in. The refinance offer ($300,000 at 6.25%, 25 years) costs $1,979.01 a month — $593,702 all in, plus $8,000 in closing costs. Monthly savings: $189.41. Break-even: $8,000 ÷ $189.41 = 42.2 → month 43, about 3 years and 7 months. Lifetime net: $650,526 − $593,702 − $8,000 = $48,824 saved. If you sell or refinance again before month 43, the deal loses money — after month 43, it wins.
Where this comes in handy
Rate-drop shopping: compare competing lender offers — a lower rate with higher fees is not always the better deal.
The 1%-of-a-point check: see how big a rate drop you really need when fees are high (a 0.5% drop on a $300k loan saves only ~$90/mo — the fees can take a decade to recover).
Points decisions: paying discount points raises the fees but lowers the rate — recalculate break-even with and without points.
Term resets: a new 30-year term after years of payments stretches the clock — try the "Extend to 30 yr" preset to see the total-cost trade.
Divide the closing costs by the monthly payment savings: break-even months = closing costs ÷ (current payment − new payment). With $8,000 in fees and $189.41 in monthly savings, you need about 42.2 months — so month 43 is when the deal finally pays for itself. That is exactly the math this calculator runs.
What counts as closing costs?
Everything you pay to open the new loan: origination fees, discount points, appraisal, title insurance and search, recording fees, and prepaid items like escrow. On a refinance it usually lands at 2–5% of the loan amount — $6,000 to $15,000 on a $300,000 mortgage. Enter the lender's full estimate, not just the origination fee.
I'm planning to move in a few years. Does that kill the refinance?
It can. The golden rule: the break-even point must land well before you expect to sell or refinance again. If the calculator says month 43 and you plan to move in 36 months, you will still be in the hole when you sell — the deal loses money. Move the break-even earlier with lower fees or a bigger rate drop, or sit this one out.
Can a refinance with a lower payment still cost me more overall?
Yes — when the new loan restarts the clock. Dropping from 25 years remaining to a fresh 30-year term means 60 extra payments; even at a lower rate, that can outweigh the monthly savings. Try the "Extend to 30 yr" preset: the payment falls $321 a month, yet the full-term cost can end up higher. Compare total cost, not just the payment.
Is a "no-closing-cost" refinance really free?
Usually not — the costs are baked into a slightly higher rate or added to the loan balance. A no-fee offer at 6.625% instead of 6.25% costs you every month instead of once; over a long stay it can be the more expensive deal. Treat the rate premium as hidden fees and compare both offers on total cost.
Should the interest I already paid count against refinancing?
No — that money is gone either way, and counting it double-penalizes the new loan. Only future costs matter: the payments you have left on the current loan versus the payments and fees on the new one. That is the comparison this calculator makes.