Refinancing can save tens of thousands of dollars — or quietly cost you money if you move before you break even. The decision comes down to one number: your break-even point, the month at which your accumulated monthly savings finally exceed the closing costs you paid to refinance.
The old rule of thumb — "refinance if you can drop your rate by 1%" — is outdated. What actually matters is the relationship between your savings, your costs, and how long you'll keep the loan.
It's simple division:
Break-even months = Total closing costs ÷ Monthly payment savings
Say refinancing costs $6,000 in fees and lowers your payment by $250/month. Your break-even is $6,000 ÷ $250 = 24 months. If you'll stay in the home longer than two years, the refinance pays off. If you might sell in 18 months, it loses money.
| Current loan | Refinanced | |
|---|---|---|
| Balance | $320,000 | $320,000 |
| Rate | 7.5% | 6.25% |
| Payment (P&I) | $2,237 | $1,970 |
That's $267/month saved. With $6,500 in closing costs, break-even is about 24 months — and over the remaining life of the loan, more than $60,000 in interest.
The most common refinancing mistake: resetting a loan you're 8 years into back to a fresh 30-year term. Your payment drops, but you've added 8 years of interest. If you refinance, either keep the remaining term (refinance into a 22-year loan) or keep making your old higher payment on the new lower rate — you'll finish years early and save the most.
Compare your current payment against a refinanced rate and find your break-even.
Mortgage Calculator →Closing costs typically run 2-5% of the loan amount — roughly $6,000-$16,000 on a $320,000 loan. Some lenders offer 'no-closing-cost' refinances, but they recover the cost through a slightly higher rate, so run the break-even math either way.
Temporarily and slightly. The hard inquiry and new account can drop your score a few points, but it recovers within months. Applying with multiple lenders within a 45-day window counts as a single inquiry for scoring purposes, so shop around freely.
Only with caution. Cash-out refinancing converts home equity to cash but increases your loan balance and often your rate. It can make sense for high-return uses (paying off 25% APR credit card debt) but is expensive for discretionary spending.