Mortgage Refinance Break-Even Calculator
Calculate exactly when refinancing pays off and whether it's worth it before your planned move-out or payoff date.
Find your refinance break-even month—and know if it’s worth it
The Mortgage Refinance Break-Even Calculator estimates the exact month when the monthly savings from refinancing add up to your upfront refinance costs. It’s designed for homeowners comparing multiple refinance offers and deciding whether refinancing pays off before you plan to sell, move out, or pay off the loan.
How the break-even month is calculated
For each refinance option, the calculator computes your monthly savings as: MonthlySavings = Pmt_Current − Pmt_Refi. It then treats your upfront costs as an “amount to recover” (Upfront = Closing_Costs + Points_Cost), and finds the smallest month N where the cumulative savings from month 1 through N reaches or exceeds that upfront amount. It also compares total cost over your selected Horizon_Months and calculates net savings vs. staying put.
What this tool assumes (and what can change the real answer)
This break-even analysis assumes no cash-out refinance—so the remaining balance stays the same (Bal_Current) across options—and it uses your provided monthly payments consistently. It typically doesn’t model the remaining principal at your horizon (it focuses on payment streams + upfront costs), so it works best when you’re comparing offers on similar loan balances and when your horizon is how you actually plan to exit the loan. If monthly payments differ because of taxes/insurance/escrows or PMI, be sure the Pmt values reflect the same components.
Interpreting results when savings are small—or negative
If a refinance option doesn’t lower your payment enough (MonthlySavings ≤ 0), the calculator shows the break-even month as “Never” and labels the option as not financially worth it. If the break-even month exists but falls after your Horizon_Months, you’ll get a verdict that it’s likely not worth it for your planned timeframe. This helps you avoid “good-looking” rates that don’t actually recoup costs before you refinance again or pay off.
Common mistakes that can skew break-even timing
Double-check that Closing_Costs is the amount you’ll pay upfront at closing (excluding or including points only if you’re entering them that way). Most importantly, when comparing multiple offers, keep Bal_Current and Horizon_Months consistent, but enter the correct Pmt_Refi for each option—mixing an estimated payment from one scenario with a different fee structure in another can move break-even by months. If you instead choose rate/term inputs later, ensure the derived payment matches your entered payment within a small tolerance to avoid silent inconsistencies.
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