Calculation details
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What does this calculator estimate?
A mortgage refinance break-even calculator shows how long it takes for rate savings to cover closing costs. Enter your balance, old and new rates, term, and closing costs.
- Break-even = closing costs ÷ monthly savings
- Refinancing pays off only if you stay past break-even
- Rate drops of 0.75–1% often justify refinancing
How refinancing pays off
Refinancing replaces your mortgage with a new one at a lower rate, cutting the monthly payment. But closing costs make it a project: the monthly savings must eventually cover those costs — the break-even point. If you sell before break-even, you lose money on the refi.
Limitations to watch for
The tool assumes the same balance and term; extending the term lowers payments but adds interest. It ignores tax effects, escrow changes, and rate-lock costs. Break-even assumes the new payment is held for the full period.
How to use it in practice
Get real quotes: the new rate and total closing costs. Compute break-even months and compare to how long you plan to stay. A common rule: refinance if the rate drops ~0.75–1% and you'll stay past the break-even.
['Enter the current balance and old rate/term.', 'Enter the new rate/term and closing costs.', 'Read monthly savings and break-even months.']
The break-even formula
Break-even months = total closing costs ÷ monthly savings. If refinancing costs $6,000 and saves $150 monthly, the break-even is 40 months. Stay longer and the refi pays; sell sooner and it loses. The calculator makes this the headline number instead of burying it in a table.
Monthly savings must be apples-to-apples
Compare the new payment with the old payment on the same basis: same principal-and-interest, or same total including escrow. A lower payment that resets the term to 30 years is not the same product as a lower payment on your remaining 22 years. The calculator separates the payment change from the term change.
The term reset trap
Refinancing a loan with 22 years left into a new 30-year term lowers the payment but extends the interest. On $200,000 at 6.5 percent, the original loan has about $160,000 of interest remaining; a new 30-year at 5.5 percent adds roughly $210,000 — more total interest despite the lower rate. Compare total interest, not just the payment.
Points and lender credits
Paying points lowers the rate but raises closing costs, moving break-even out; lender credits do the opposite, lowering upfront cost at a higher rate. The calculator accepts your actual cost so the break-even reflects the points-versus-rate trade you are actually offered.
A worked example
A $300,000 loan at 6.5 percent has a principal-and-interest payment near $1,896. Refinancing at 5.5 percent with $5,500 in closing costs drops the payment to about $1,703 — $193 saved monthly, break-even around 29 months. At a 5-year horizon, the refi saves roughly $6,000 net.
How this calculator works
Formula
New payment from the standard amortization formula at the new rate; monthly savings = old payment − new payment; break-even months = total closing costs ÷ monthly savings.
Worked example
A $250,000 balance at 7% (30 yr) has a $1,663 payment; refinancing to 6% (30 yr) gives $1,499 — saving $164/month. With $6,000 in closing costs, break-even ≈ 36.5 months.
Assumptions to verify
- The balance stays the same (no cash-out).
- The new loan amortizes over the entered term.
- Closing costs are paid upfront and included in the analysis.
Frequently asked questions
What is the break-even point in refinancing?
The months of payment savings needed to recover closing costs: costs ÷ monthly savings. $6,000 ÷ $164 ≈ 37 months.
When should I refinance?
When the rate drop is meaningful (0.75–1%+), the savings justify costs, and you'll stay in the home past break-even.
How do I calculate monthly savings?
Subtract the new payment from the old: $1,663 − $1,499 = $164/month at 7% → 6% on $250k.
What are closing costs on a refinance?
Appraisal, origination, title, and recording fees — typically 2–5% of the loan, or $3,000–$8,000.
Should I extend the term?
Extending lowers the payment but adds years of interest — compare total interest, not just the payment.
What is a cash-out refinance?
Borrowing more than the balance to take equity out as cash — different math than a rate-and-term refi.
How do I know if it's worth it?
Compare break-even months with your expected time in the home. If you'll move before break-even, don't refinance.
How do I calculate refinance break-even?
Divide total closing costs by monthly savings: $6,000 ÷ $150 = 40 months.
How long should I plan to stay?
Longer than break-even and the refi pays; shorter and it loses — the horizon is the decision.
Does a lower payment always mean a better loan?
No — resetting the term can increase total interest even with a lower payment.
Do points change break-even?
Yes — points raise closing costs and lengthen break-even; lender credits shorten it.
Cite this tool
BoringToolsKit. “Mortgage Refinance Break-Even Calculator.” boringtoolskit.com/mortgage-refinance-break-even/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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