Loan Refinance Break-Even Calculator

A loan refinance break-even calculator is a financial analysis tool that determines whether refinancing a loan makes economic sense. It compares your current loan - its outstanding balance, interest rate, and remaining term - against a proposed refinance with a new rate, new term, and upfront costs (closing costs and prepayment penalties). The calculator computes the break-even point: the number of months it takes for the monthly savings from the lower rate to offset the upfront costs of refinancing. It also shows net savings over different time horizons and provides a clear recommendation. Our refinance break-even calculator runs entirely locally in your browser - no data is uploaded to any server.

1. Enter your current loan details: Start with your current loan balance (the outstanding principal), your current annual interest rate, and the number of months remaining on the loan. For example, a $300,000 mortgage at 6.5% with 300 months (25 years) remaining. The calculator computes your current monthly payment and total remaining interest using the standard amortization formula.
2. Enter the proposed refinance terms: Add the new interest rate you qualify for, the new loan term in months, the estimated closing costs (typically 2-5% of the loan amount - includes origination, appraisal, title search, and application fees), and any prepayment penalty your current lender charges for paying off the loan early. The calculator computes the new monthly payment and total interest under the proposed terms.
3. Review the analysis and recommendation:The calculator shows your monthly savings (or loss), break-even month, total interest savings, and net savings after 1, 3, 5, and 10 years. A visual cumulative savings chart plots your net position month by month, and a clear recommendation - Refinance, Don't Refinance, or Consider Carefully - is provided with a detailed explanation based on your specific numbers and the break-even analysis.

• Break-Even Point: The month when cumulative monthly savings from the lower rate equal the total upfront cost of refinancing (closing costs + prepayment penalty). If you sell the property or pay off the loan before the break-even point, you will have lost money on the refinance. A break-even of 36 months or less is generally considered favorable for most borrowers.
• Monthly Savings: The difference between your current monthly payment and the new monthly payment. A lower rate reduces the interest portion of each payment, but extending the term can offset this savings by spreading payments over more months. The calculator separately shows the effect of rate changes and term changes.
• Total Interest Savings: The difference between the total interest you would pay on your current loan over its remaining term and the total interest on the new loan over its term. This is a long-term metric - even if monthly savings are modest, the total interest savings over 10-30 years can be substantial.
• Closing Costs & Prepayment Penalty: Closing costs are fees charged by the new lender to originate the loan (2-5% of the loan amount). Prepayment penalty is a fee some current lenders charge for paying off the loan early. Both increase the total cost of refinancing and extend the break-even period. Some refinances (like student loan consolidation) may have $0 closing costs.

Refinancing typically makes financial sense when interest rates have dropped significantly since you took out your original loan, and you plan to stay in the property or keep the loan long enough to reach the break-even point. A general rule of thumb is that refinancing is worth considering if you can lower your rate by at least 1% (100 basis points) and plan to stay in the home for at least 2-3 years. However, even smaller rate reductions can be worthwhile if closing costs are low or rolled into the loan. Use this refinance break-even calculator to model different scenarios before approaching lenders - try different new rates, closing cost amounts, and loan terms to find the optimal refinancing strategy for your situation. Remember that refinancing also resets your loan term, which could mean paying more total interest even with a lower rate if you extend the term significantly. All calculations are performed locally in your browser - your data never leaves your device.