A refinance replaces an existing mortgage with a new loan. A lower rate or payment can be useful, but the decision also depends on closing costs, the new loan term, how long you expect to keep the loan, and whether costs are paid in cash or financed.
Start with a simple payment break-even
A common first-pass calculation is:
Eligible refinance costs ÷ estimated monthly payment savings = simple break-even months
If costs are $5,200 and the estimated monthly savings are $280, the simple payment break-even is about 18.6 months. This calculation is useful, but it is not a complete return-on-investment analysis.
Model your break-even period
Compare the current loan with a proposed refinance using your own rate, balance, term, and closing-cost assumptions.
Open Refinance Break-Even Calculator →Why the simple formula is not enough
A refinance can reduce the required monthly payment for more than one reason. A lower interest rate may help, but extending the loan term can also lower the payment while increasing the time over which interest is paid. Compare the remaining term on the current mortgage with the new term rather than focusing only on monthly cash flow.
Costs can be paid in different ways
The CFPB notes that a “no-cost” or “no-closing-cost” refinance still has costs. A lender may cover them through a higher interest rate or the costs may be added to the loan balance. Either approach changes the economics of the new loan.
Compare Loan Estimates on equivalent terms
The Loan Estimate provides standardized information about the interest rate, projected payment, closing costs, lender credits, and other loan features. For a useful comparison, request the same kind of refinance from multiple lenders and compare the full disclosure rather than the advertised rate alone.
Questions to answer before refinancing
- What is the current unpaid principal balance and remaining term?
- What rate, APR, points, and lender credits are on the new Loan Estimate?
- Which closing costs are paid in cash, financed, or offset by credits?
- How much of the payment change comes from the rate versus a longer term?
- How long do you realistically expect to keep the new loan?
- Does the new loan add cash-out debt or change mortgage-insurance costs?
A better way to think about refinance ROI
Instead of labeling a refinance “good” or “bad” from one rate threshold, compare cumulative cash flows over the period you expect to keep the loan. Include upfront costs, financed costs, payment differences, term changes, and the remaining balance at the end of the comparison period.
Sources
- CFPB: No-cost and no-closing-cost refinancing
- CFPB: Loan Estimate explainer
- CFPB: Review and compare Loan Estimates
- MortgageCalculatorNow refinance methodology
Bottom line
The break-even period is a useful screening metric, not a complete answer. Compare the new loan's full costs, term, balance, and expected holding period before deciding whether a refinance fits your goals.