When Does a Refinance Actually Pay for Itself? The Breakeven Math

A lower interest rate feels like an obvious win, but refinancing isn’t free — closing costs typically run 2% to 5% of the loan amount. The real question isn’t whether your rate drops; it’s whether you’ll stay in the home long enough for the monthly savings to outweigh what you paid to get there. That’s the breakeven point.

The basic calculation:

• Add up total closing costs for the new loan
• Calculate your monthly savings — the difference between your old payment and your new one
• Divide closing costs by monthly savings to get the number of months until breakeven
• Compare that timeline to how long you actually plan to stay in the home

A simple example: $6,000 in closing costs divided by $150 in monthly savings puts your breakeven point at 40 months — a little over three years. If you plan to move or sell before then, the refinance likely costs more than it saves.

Other factors that affect the real math:

• Resetting your loan term — refinancing into a new 30-year term can lower your payment but extend how long you’re paying interest overall
• Rolling closing costs into the loan rather than paying them upfront, which changes your true breakeven timeline
• Rate-and-term versus cash-out refinances, which carry different cost structures and payoff math

The lowest rate isn’t always the best deal — the fastest breakeven relative to how long you’ll actually stay in the home is. Running the numbers before applying keeps a refinance from becoming a decision you regret two years in.