Refinancing a mortgage means replacing your current loan with a new one, ideally at a lower rate or better terms. Whether it's actually worth doing comes down to a breakeven calculation: do the monthly savings outweigh the closing costs within a timeframe that matches how long you plan to keep the loan?
The breakeven calculation that matters most
Refinancing isn't free — closing costs typically run 2% to 5% of the loan amount, similar to a purchase. Divide those costs by your monthly payment savings to find your breakeven point in months. If refinancing saves you $150 a month and costs $4,500 in closing costs, your breakeven point is 30 months — meaning you need to stay in the home at least that long for the refinance to have actually paid for itself.
A common rule of thumb suggests refinancing makes sense when you can lower your rate by at least 0.75 to 1 percentage point, but the real answer depends entirely on your specific closing costs and how long you plan to stay — the rule of thumb is a starting point, not a final answer.
Reasons beyond just a lower rate
Rate reduction is the most common reason to refinance, but not the only one. Some borrowers refinance to switch from an adjustable to a fixed rate for stability, to shorten their loan term and pay off the home faster, or to access home equity through a cash-out refinance. Each of these has its own cost-benefit calculation distinct from a pure rate-and-term refinance.
When refinancing usually doesn't make sense
If you're planning to sell within a year or two, or if your current rate is already close to current market rates, the closing costs often outweigh any realistic savings. Refinancing also resets your amortization schedule in most cases, meaning more of your early payments go toward interest again — a detail worth considering if you're already well into your current loan's term.
- Calculate your specific breakeven point using actual closing cost estimates, not rules of thumb
- Compare that breakeven timeline honestly against how long you actually plan to stay
- Consider non-rate reasons for refinancing, like switching loan types or accessing equity, separately from pure rate savings
- Account for resetting your amortization schedule if you're refinancing later into an existing loan's term
Frequently asked questions
Can I roll closing costs into the new loan instead of paying upfront?
Yes, many lenders allow this, though it increases your loan balance and slightly extends your breakeven timeline since you're financing the cost rather than paying it directly.
Does refinancing affect my credit score?
It triggers a hard inquiry and a new account, both of which can cause a small temporary dip, similar to any other loan application — generally a minor and short-lived effect relative to the potential savings.