Refinancing replaces your current mortgage with a new loan, usually to get a lower interest rate, change the loan term, or tap home equity. It can save thousands over the life of the loan, but only if the savings outweigh the closing costs and you stay in the home long enough.
The decision comes down to break-even: how many months of lower payments it takes to recover what you paid to refinance.
Calculating break-even
Break-even months equals total closing costs divided by monthly savings. If refinancing costs $4,000 and saves $200 per month, break-even is 20 months. Stay longer than that and you come out ahead; move sooner and you lose money on the refi.
Monthly savings is your current principal-and-interest payment minus the new payment. Do not count escrow changes or PMI adjustments unless they are part of the refinance deal.
A refinance calculator models this automatically, enter your current balance, rate, new rate, closing costs, and expected stay to see break-even and lifetime savings.
When refinancing makes sense
A rate drop of 0.75–1.0 percentage point or more often justifies refinancing, especially on large balances. Smaller rate drops can still work if closing costs are low or the lender offers a no-closing-cost option (usually via a slightly higher rate).
Switching from a 30-year to a 15-year mortgage raises monthly payments but cuts total interest dramatically. Refinancing to extend the term lowers payments but may increase total interest, useful for cash flow relief, not long-term savings.
Removing PMI by refinancing once you have 20% equity is another common trigger, even if the rate improvement is modest.
When to skip refinancing
If you plan to sell within the break-even window, refinancing usually loses money. Transaction costs on the sale compound the loss.
Restarting the clock on a 30-year loan after 10 years of payments can cost more total interest even at a lower rate. Compare total interest paid, not just the monthly payment.
Cash-out refinances that increase your loan balance for non-essential spending can erode equity and extend debt. Treat equity extraction as a deliberate decision, not a default.
Rate shopping tips
Get quotes from at least three lenders within a 14-day window. Multiple credit inquiries in that period typically count as one for scoring purposes.
Compare APR, not just the interest rate. APR includes some fees and gives a better picture of total cost. Ask for a loan estimate and review origination fees, points, and third-party charges.
Watch for prepayment penalties on your current loan. They are rare on modern mortgages but can block a refinance if they exist.
Run your refinance analysis
Enter your current loan details, the new rate and term, closing costs, and how long you plan to stay. The calculator shows break-even months and total interest saved or lost.
Pair with the mortgage calculator to see your new payment, and the mortgage payoff calculator if you plan to accelerate principal after refinancing.