Current Mortgage
New Mortgage (Refinance)
2026 average refinance rates: 5.5-6.5%
Closing Costs
Typically 2-6% of loan amount
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Introduction
When mortgage rates drop, homeowners face a deceptively simple-looking decision: should I refinance? The problem is that refinancing is never free. Closing costs typically run 2-5% of the loan amount -- on a $350,000 refinance, that is $7,000-$17,500 in upfront fees. A rate drop from 7.25% to 6.25% saves $189/month on that loan. Simple math says the break-even is $17,500 / $189 = 92 months. But that ignores mortgage interest deductibility, the opportunity cost of the closing cost capital, the resetting of your amortization schedule, and how long you actually plan to stay in the home. The Consumer Financial Protection Bureau's mortgage refinancing guidance warns that most homeowners who refinance every time rates dip end up paying more total interest because they repeatedly restart the amortization clock. This calculator models the true break-even.
What This Calculator Does
This mortgage refinance break-even calculator determines how many months it takes to recoup the upfront closing costs of a refinance through monthly payment savings. It models both cash-out and no-cash-out refinancing scenarios, accounts for the amortization schedule reset (showing months of additional interest at the beginning of the new loan), calculates the true break-even with and without tax benefits from mortgage interest deduction, and compares total cost over the remaining loan life for staying versus refinancing.
The Formula
Monthly savings is the difference between old and new payment on a fixed-rate basis. Simple break-even divides total closing costs by monthly savings. True break-even adds the opportunity cost: closing costs paid upfront could have been invested. At 5% return, $12,000 in closing costs generates $50/month in foregone investment income, reducing net monthly savings. The amortization reset penalty matters significantly: refinancing a 20-year-old 30-year mortgage into a new 30-year loan restarts the interest-heavy early payment schedule, potentially increasing total interest paid even at a lower rate. Always compare total remaining payments under both scenarios, not just monthly payment amounts.
Step-by-Step Example
Document current mortgage terms
Current balance: $284,000. Current rate: 7.125% fixed. Remaining term: 22 years (264 months). Current monthly payment (P+I): $2,240. Monthly interest paid in next payment: $284,000 x (7.125%/12) = $1,679.50.
Model the refinance terms
New rate: 6.25% fixed. New loan term: 30 years. New balance: $284,000 (no cash out). New monthly payment: $1,749. Closing costs: origination fee $2,100 + title $1,200 + appraisal $650 + other $850 = $4,800. Monthly savings: $2,240 - $1,749 = $491.
Calculate simple break-even
Simple break-even: $4,800 / $491 = 9.8 months (approximately 10 months). If you plan to stay more than 10 months, the monthly savings exceed the cost. This looks attractive.
Calculate true total cost comparison
True comparison: Remaining payments on current loan: $2,240 x 264 = $591,360. New loan total payments: $1,749 x 360 = $629,640 + $4,800 closing = $634,440. Refinancing costs $43,080 more in total despite lower monthly payments -- because you added 96 months (8 years) of payments. The break-even on total cost is 22+ years of continuous occupancy. This is the number that changes the decision.
Real-World Use Cases
Homeowner Planning to Stay Long-Term
A couple in their 40s bought their forever home 5 years ago with a 30-year mortgage at 7.5% ($320,000 balance, 25 years remaining). Refinancing to 6.25% / 30 years: monthly savings $274, closing costs $6,400, simple break-even 23 months. They plan to stay 20+ years. Total interest: current path = $282,000 remaining; new 30-year = $315,800 + $6,400 = $322,200. Despite lower rate, total cost is higher due to term extension. Better option: refi to 20-year at 6.0%, payment increases $120/month but total interest = $198,000 (saves $84,000).
Homeowner Likely to Move in 4-5 Years
A homeowner with 3.5% rate from 2021 considering a no-cost refinance (rate 6.4%). Monthly payment increases $680. This is never a good refinance. A homeowner with a 7.9% rate considering 6.25% refinance with $8,500 closing costs and a 4-year move plan: monthly savings $310, break-even 27 months. Staying 4 years (48 months) means 21 months of net savings after break-even: $310 x 21 = $6,510 net savings. Worthwhile.
Cash-Out Refinance Evaluation
A homeowner wants $40,000 equity for home renovations. Options: (A) Cash-out refi at 6.5% on $320,000 new balance, or (B) Home equity loan at 8.5% for $40,000 only. Cash-out refi monthly payment: $2,023 (up from $1,890). HELOC adds $380/month on top of existing payment. The calculator compares both over the renovation hold period and total interest to identify the lower-cost borrowing path for the homeowner's specific timeline.
Comparison
| Rate Drop | Loan Balance | Monthly Savings | Closing Costs (3%) | Break-Even (Simple) |
|---|---|---|---|---|
| 0.5% (e.g., 7.0% to 6.5%) | $200,000 | ~$65/mo | $6,000 | 92 months (7.7 yrs) |
| 0.5% | $350,000 | ~$115/mo | $10,500 | 91 months (7.6 yrs) |
| 1.0% (e.g., 7.5% to 6.5%) | $200,000 | ~$130/mo | $6,000 | 46 months (3.8 yrs) |
| 1.0% | $350,000 | ~$230/mo | $10,500 | 46 months (3.8 yrs) |
| 1.5% | $200,000 | ~$195/mo | $6,000 | 31 months (2.6 yrs) |
| 1.5% | $350,000 | ~$345/mo | $10,500 | 30 months (2.5 yrs) |
| 2.0% | $200,000 | ~$260/mo | $6,000 | 23 months (1.9 yrs) |
Common Mistakes to Avoid
Using simple break-even without considering the loan term extension. Refinancing 20 years remaining into a new 30-year loan adds 10 years of payments. Even at a lower rate, total interest often increases substantially. Always calculate and compare total remaining interest paid under both scenarios, not just monthly savings.
Ignoring closing costs rolled into the loan. Rolling $8,000 in closing costs into the mortgage balance means you pay interest on those costs for the life of the loan. At 6.5% over 30 years, $8,000 in costs added to principal costs an additional $9,200 in interest -- the total refinancing cost is $17,200, not $8,000.
Not accounting for private mortgage insurance (PMI). If your original LTV required PMI and the new loan raises your balance (cash-out) back above 80% LTV, PMI is reinstated. PMI costs 0.5-1.5% of loan balance annually ($100-400/month on a $300,000 loan) and significantly extends the true break-even.
Comparing rate without comparing APR. The quoted rate does not reflect closing costs. The APR (Annual Percentage Rate) includes origination fees and costs amortized over the loan life. Compare APRs from multiple lenders, not just rates. A lender offering 6.1% with $12,000 in fees may cost more over 7 years than a 6.25% offer with $4,500 in fees.
Frequently Asked Questions
Accuracy and Disclaimer
Refinance break-even calculations are estimates based on the inputs provided. Actual closing costs vary by lender, location, loan size, credit profile, and market conditions. Monthly payment calculations assume principal and interest only and do not include property taxes, homeowners insurance, or private mortgage insurance (PMI). Interest rate projections do not constitute a rate lock or rate commitment. Tax deductibility of mortgage interest depends on individual tax circumstances, including whether you itemize deductions and the applicable limitations on mortgage interest deduction under current IRS rules. Consult a mortgage professional, tax advisor, and certified financial planner before making refinancing decisions. Not financial or legal advice.
Conclusion
A refinance that breaks even in 18 months makes sense if you plan to stay in the home for 5+ years. A refinance that breaks even in 48 months with a 3-year move planned does not -- even if the monthly payment drops. Always calculate the break-even before refinancing. Use the Net Worth Calculator after refinancing to confirm your home equity position, and the Savings Goal Calculator to model how your monthly savings might be deployed toward another financial goal.
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