A lower rate sounds like an obvious win — until you factor in closing costs, which can run thousands of dollars. Refinancing only makes sense once you know your break-even point, and that number is easy to calculate.

What refinancing actually does

Refinancing replaces your existing mortgage with a new one — ideally at a lower rate, a shorter term, or both. But “replacing” a loan isn’t free: expect closing costs similar to what you paid on your original mortgage, typically 2–5% of the loan amount.

The break-even formula

Break-even (months) = Total closing costs ÷ Monthly savings

If refinancing costs you $4,000 in fees and saves you $200 a month on your payment, your break-even point is 20 months. Stay in the home (or keep the loan) longer than that, and refinancing was worth it. Sell or refinance again before then, and you likely lost money on the fees.

Beyond the interest rate: other reasons to refinance

  • Switching from a variable to a fixed rate for payment stability, even if the fixed rate is slightly higher today
  • Shortening your term — e.g., moving from a 30-year to a 15-year loan to cut total interest, even if the monthly payment goes up
  • Cash-out refinancing — borrowing against home equity for renovations or debt consolidation
  • Removing PMI once your home’s value has risen enough to clear the 80% loan-to-value threshold

When refinancing usually isn’t worth it

  • You plan to move or sell before the break-even point
  • The rate improvement is marginal (under roughly 0.5–0.75%) relative to the closing costs
  • You’re already several years into your current loan — restarting the amortization clock means paying more interest early again, even at a lower rate

Run your specific numbers — current payment, new rate, and closing costs — through our Refinance Calculator to see your exact break-even point before you commit to anything.