When Does Refinancing Actually Make Sense? The Break-Even Math
Published 2026-07-31 · Migrify.AI
Refinancing replaces your mortgage with a new one at today's rate. Whether that's a win comes down to one number: how long until the monthly savings repay the closing costs?
The break-even calculation
Refinance closing costs typically run 2–5% of the loan amount — appraisal, title, origination. The math:
Break-even months = closing costs ÷ monthly savings.
Example: a $320,000 balance at 7.4% with 26 years left costs about $2,313/month. Refinancing to 6.8% drops it to about $2,189 — saving roughly $124/month. Against $6,000 in closing costs, you break even in about 48 months. Stay in the home longer than that and the refinance pays for itself; sell sooner and it never does. Our free refinance calculator computes your monthly and lifetime savings instantly.
Three refinance mistakes
- Resetting the clock. Five years into a 30-year loan, refinancing into a fresh 30-year term means paying interest for 35 years total. Ask for a term that matches your remaining years — or refinance into a 15-year.
- Rolling costs into the loan and forgetting them. Financed closing costs still cost you — plus interest on them for decades.
- Chasing a rate without checking the fees. A "no-cost" refinance usually means a higher rate; sometimes that's fine, but compare the all-in monthly.
When it clearly makes sense
- Your new rate is meaningfully lower and you'll stay past break-even.
- You're dropping PMI because your equity has grown past 20%.
- You're switching from an adjustable rate to a fixed rate before a reset.
Run your actual balance, rate, and remaining years through the refinance calculator — the answer usually takes about thirty seconds.
Run your own numbers: the free Migrify.AI calculator shows your full payment — taxes, insurance, and PMI included — in seconds, with no sign-up and no credit impact.