Direct answer
A mortgage refinance is economically ahead only after cumulative comparable savings recover all switching costs, and only if the loan remains in place long enough without a term extension erasing the gain.
What this calculation tells you
The model compares entered existing and replacement mortgage paths and identifies a cash-flow break-even.
It cannot predict valuation, approval, future rates, taxes, or how long the borrower keeps the loan.
Where it is used
Homeowners
Screen a refinance quote.
Mortgage advice
Make fees and horizon explicit.
Cash-flow planning
Separate lower payment from total saving.
Equity planning
Show costs financed into the balance.
When this guide helps
- Rates are lower than the current mortgage.
- A shorter or longer term is proposed.
- Costs will be financed.
- The property may be sold soon.
Use today's existing-loan baseline
Capture payoff balance, remaining term, rate structure, penalties, and expected payments rather than restarting the original mortgage illustration.
Include every switching cost
Valuation, legal, title, lender, government, broker, exit, and financed costs should be entered where applicable and current.
Measure through the expected exit
Compare balances and cumulative costs at the likely sale, payoff, or next refinance date—not only at each loan's different maturity.
Common mistakes
Before relying on mortgage refinancing and the real break-even point, test the stated assumptions and keep its decision boundary visible.
- Comparing advertised rates only.
- Ignoring financed fees and reset term.
- Assuming the mortgage remains until break-even.
Worked case: payment-only screen
Remaining balance is 320,000. Entered old payment is 2,129, new payment 1,918 and refinance cost 6,000.
Monthly difference=211; simple break-even=6,000/211≈28.44 months.
Payment-only break-even is around month 29.
This is not the economic break-even if the new amortization term changes balance reduction.
Reproduce this worked caseOpen Mortgage Refinance Break-Even Calculator
Worked case: leave at month 24
Use the same payment difference but an expected exit after 24 months.
Cash-flow saving=24x211=5,064, still 936 below entered costs.
Simple costs are not recovered before the exit.
A final comparison must also subtract the different payoff balances at month 24.
Reproduce this worked caseOpen Mortgage Refinance Break-Even Calculator
mortgage refinance break-even: compare assumptions, not just answers
Rate, term, points, financed costs, escrow and cash-out can all change the meaning. Compare matched principal and selected-horizon net positions.
| Scenario | Changed assumption | Result |
|---|---|---|
| Hold 29+ months | 211/month | Simple recovery |
| Exit month 24 | 5,064 saving | 936 unrecovered |
mortgage refinance break-even: calculation checklist
- Old/new balances matched
- All costs included
- Terms and rates explicit
- Exit payoff balances compared
- No automatic savings claim
Practical questions
Frequently asked questions
Is break-even fees divided by monthly saving?
That shortcut can fail when savings vary, fees are financed, or balances and terms differ; use cumulative cash flows.
Should I refinance to a longer term?
It may reduce near-term payment while extending debt and interest; compare the same horizon and ending balance.
What if I plan to move?
Use that expected date; savings projected after sale are irrelevant.
Further reading
Authoritative sources
Use these primary and professional resources to check definitions, conventions, or requirements that may extend beyond this guide.