When Should You Refinance Your Mortgage? The Break-Even Rule
The break-even math that separates a smart refinance from an expensive mistake — plus a worked example.
Refinancing pays off when you'll stay in the home longer than your break-even period — the time it takes for monthly savings to recover your closing costs. Break-even (months) = closing costs ÷ monthly payment savings. A common example: $6,000 in closing costs and $236/month in savings breaks even in about 25 months.
Run your own current and prospective rate through our refinance calculator to get your exact break-even point.
Refinancing isn't automatically a good idea just because rates have dropped — it costs real money upfront, and that cost only pays for itself if you stay in the loan long enough. The break-even rule is the single most useful number for deciding whether a refinance actually makes sense for you.
The Break-Even Formula
If refinancing costs $6,000 and saves you $236/month, you'd break even in about 25 months (a little over 2 years). Stay in the home longer than that, and refinancing nets you real savings; move or refinance again sooner, and you'll have paid the closing costs without fully recovering them.
Worked Example
Say you have a $350,000 balance remaining on your mortgage at 7.5%, and you're offered a refinance at 6.5% with $6,000 in closing costs, keeping the same 30-year amortization for simplicity:
| Current loan (7.5%) | Refinanced (6.5%) | |
|---|---|---|
| Monthly P&I payment | ~$2,447 | ~$2,212 |
| Monthly savings | ~$236 | |
| Break-even | $6,000 ÷ $236 ≈ 25 months | |
In this example, if you plan to stay in the home for more than about 2 years, refinancing likely pays off. Use our mortgage payment calculator to get your current and prospective payments precisely, and our APR calculator to compare offers that bundle different fees into the rate.
When Refinancing Usually Makes Sense
Good candidates
- You plan to stay well past the break-even point
- Rates have dropped meaningfully since you took out your loan
- Your credit score has improved significantly
- You want to remove PMI now that you have 20%+ equity
- You want to switch from an adjustable to a fixed rate for stability
Weaker candidates
- You expect to move or sell before the break-even point
- You're already several years into your loan and would reset to a full new term
- The rate improvement is marginal relative to closing costs
- You're planning to pay off the loan aggressively regardless
Also worth refinancing for
- Shortening your term (e.g. 30-year into 15-year) to cut total interest — see our 15 vs 30-year comparison
- Cash-out refinancing to consolidate higher-interest debt
- Removing a co-borrower after a life change, where the loan terms allow it
The Mistake That Erases Your Savings
Refinancing into a new 30-year term resets your amortization clock. If you're already 8 years into your original 30-year mortgage and refinance into another 30-year loan, you're extending your total payoff timeline by 8 years — which can increase total lifetime interest even at a meaningfully lower rate. Where possible, refinance into a term that matches your remaining years (for example, a 22-year term if you have 22 years left) to capture the rate savings without resetting the clock. Our amortization calculator can show you exactly how much interest remains under each scenario.
Worth knowing: A widely repeated rule of thumb says to refinance only if rates drop at least 0.5-1 percentage point — but the break-even calculation is the more reliable test, since it accounts for your actual closing costs and how long you'll stay, not just the rate gap.
Frequently Asked Questions
When should you refinance your mortgage?
Refinancing generally makes sense when the time it takes to recover your closing costs through monthly savings (the break-even point) is shorter than how long you plan to stay in the home. A common rule of thumb is considering refinancing when rates drop at least 0.5-1 percentage point below your current rate, though the break-even math matters more than any fixed rate threshold.
How do you calculate the refinance break-even point?
Break-even period (in months) equals total closing costs divided by your monthly payment savings. For example, $6,000 in closing costs with $236/month in savings breaks even in about 25 months, or roughly 2 years.
How much does it cost to refinance a mortgage?
Refinance closing costs typically run 2-5% of the loan amount, covering the lender's origination fee, appraisal, title insurance, and other closing costs — similar in scope to the closing costs on an original home purchase.
Is it worth refinancing if I'm planning to move soon?
Usually not, if you'll move before reaching the break-even point — you'd pay the closing costs but never fully recover them through monthly savings. Refinancing tends to make the most sense for homeowners planning to stay well past their break-even timeline.
Does refinancing reset my loan term?
Yes, unless you specifically choose otherwise. A standard refinance into a new 30-year loan restarts your amortization schedule, which can increase total lifetime interest even at a lower rate if you'd already paid down several years of your original loan — consider refinancing into a term that matches your remaining years instead.
Can you refinance to remove PMI instead of to get a lower rate?
Yes — if your home's value has risen enough that you now have 20% or more equity, refinancing (or requesting PMI removal without a full refinance, if your loan qualifies) can eliminate your PMI payment even if the interest rate itself doesn't change much.
