The basic calculation
Divide the true refinance costs by the expected monthly savings. If eligible costs total $6,000 and the payment falls by $250, the simple break-even point is 24 months. That is the approximate time needed for monthly savings to recover the upfront cost.
Use the real cost and real savings
Separate prepaid items and escrow funding from transaction costs, and account for any lender credit or points. Compare payments using the same treatment of taxes, insurance and mortgage insurance so the savings figure is not distorted.
The term reset matters
Replacing a loan that has 23 years remaining with a new 30-year mortgage can lower payment partly by extending repayment. That may still be appropriate, but the analysis should show remaining term, new term and projected interest—not only the first monthly payment.
Match the break-even period to the plan
If you expect to sell, refinance again or pay off the loan before the break-even point, the proposed transaction may not recover its cost. If the expected holding period is substantially longer, the cumulative benefit may be more compelling. The decision should support the actual property timeline.
Build a three-column refinance comparison
Place the current mortgage, a new loan using the remaining term and a new 30-year structure in separate columns. Show balance, rate, payment, costs, break-even month and estimated payoff timing. This reveals whether savings come from a better price, a longer repayment period or both.
- Current loan
- New loan near the remaining term
- New 30-year loan
- Break-even and ownership horizon
Authoritative sources and further reading
Refinance disclosures, costs and consumer guidance can change. The official resources below provide current reference material for comparing a proposed refinance.