What is a refinance break-even point?
Refinancing replaces your current mortgage with a new one, usually to get a lower rate or a lower payment. It is not free. Lenders charge closing costs (appraisal, title insurance, origination and recording fees) that typically run 2–5% of the loan, and you may choose to buy discount points to lower the rate further. The break-even point is the month when what you have gained from the new loan finally exceeds what you paid to get it. Sell the house or refinance again before that month and the refinance lost you money; stay longer and every month after it is profit.
That makes the break-even point the single most useful number when a lender calls with a "lower rate" offer. A rate drop that sounds impressive can still be a bad deal if the costs are high or you expect to move in a couple of years.
The simple formula, and why we go further
The rule of thumb most lenders quote is:
With $6,000 in costs and $240 a month in savings, that is 25 months. It is a good first check, but it has a blind spot: it only looks at the payment. If the new loan has a longer term, a lower payment can come mostly from stretching the debt out, not from a cheaper rate. You pay less each month but pay down your balance more slowly, so you build less equity. The simple formula counts that as "savings" when it is really borrowing from your future self.
This calculator therefore tracks your net position every month:
The last term is the equity adjustment. On the day you close, net position equals minus your total costs (including any costs rolled into the loan, because they raise the new balance). Break-even is the first month net position reaches zero or above. Both loans are amortized month by month with the standard payment formula M = P × r / (1 − (1 + r)−n) and interest rounded to the cent, the same engine used by our extra payment calculator. Because both balances are counted, the result is also what you would actually have in hand if you sold the home in that month.
Worked example: 7% to 6%
Say you owe $300,000 at 7% with 28 years left. Your payment is $2,038.83. A lender offers a new 30-year loan at 6% with $6,000 of closing costs paid in cash. The new payment is $1,798.65, a saving of $240.17 a month.
- Simple break-even: $6,000 ÷ $240.17 = 24.98, so about 25 months.
- Net-position break-even: also 25 months. Here the rate cut is large enough that the new loan's balance keeps pace with the old one even though the term restarts.
- After 2 years you are still about $58 behind. After 5 years you are about $8,570 ahead, and after 7 years about $14,060 ahead.
- Over the full life of the loans, total interest falls from $385,043 to $347,515, so even counting the two extra years of payments you come out roughly $31,500 ahead.
Verdict: if you will stay more than about two years, this refinance is worth doing.
Worked example: the term-extension trap
Now take a $250,000 balance at 6.5% with 20 years left (payment $1,863.93) and refinance into a new 30-year loan at 6% with $5,000 of costs. The payment drops by $365 a month, so the simple formula says you break even in just 14 months. But the new loan pays principal far more slowly. After five years you have saved $21,903 in payments, yet you owe $18,663 more than you would have on the old loan, and you spent $5,000 to close. Your net position is about −$1,760. After ten years it is −$6,253, and over the full term the new loan costs about $92,000 more in interest. On a net basis this refinance never breaks even.
That does not automatically make it wrong. Lowering a payment can be the right call for cash-flow reasons. But you should know you are paying for that flexibility. If you want both a lower rate and no extra interest, choose a new term that matches your remaining years (many lenders offer 20- or 25-year terms), or refinance to 30 years and keep paying the old amount, with the difference sent as extra principal.
Rolling costs into the loan, and paying points
"No cash at closing" refinances add the costs to your balance. You avoid the up-front check, but you pay interest on those costs for the life of the loan and start with a bigger balance. In the 7%-to-6% example, rolling $6,000 in and buying one point (1% of the new $306,000 loan, $3,060 in cash) cuts the payment to $1,834.62. Break-even then stretches from 25 months to about 42. Points only make sense if you are confident you will keep the loan well past their own break-even, usually five years or more. A "no-cost" refinance, where the lender covers fees in exchange for a higher rate, is the mirror image: break-even is almost immediate but long-run savings are smaller.
When refinancing usually makes sense
- Break-even comes well before you expect to move. Leave a margin: plans change.
- The rate drop is meaningful. With typical costs, about 0.75–1 percentage point is often needed. Half a point can work on large balances or low-cost loans.
- You are not restarting a long term late in the loan. The further you are into your mortgage, the more a fresh 30-year term costs in total interest.
- Other goals are covered. Removing PMI, switching from an adjustable to a fixed rate, or removing a co-borrower can justify a refinance even with modest savings.
If you only have a lump sum and a good rate already, compare refinancing with a mortgage recast, which lowers your payment for a small fee without new closing costs. Use this calculator with the exact figures from your lender's Loan Estimate, especially section D, "Total loan costs", for the most reliable answer.
Frequently asked questions
How do I calculate my refinance break-even point?
Divide your total refinance costs by your monthly payment savings. For example, $6,000 in costs ÷ $240 saved per month = 25 months. For a more accurate answer, this calculator also accounts for the difference in loan balances, which matters when the new loan has a longer term.
What is a good break-even point for a refinance?
There is no fixed rule, but many homeowners aim for 24–36 months or less. What matters is that you reach break-even comfortably before you expect to sell or refinance again.
Does extending my loan term affect break-even?
Yes. A longer term lowers the payment but slows principal paydown, so you build less equity. The simple formula ignores this and can make a refinance look better than it is. Our net-position method includes it, and the comparison table shows any increase in total interest.
Should I roll closing costs into the new loan?
Rolling costs in saves cash today but raises your balance and the interest you pay on it, which pushes break-even later. Paying in cash usually gives a faster break-even if you have the savings.
Are discount points worth it?
One point costs 1% of the loan and typically lowers the rate by about 0.25 percentage points. Points pay off only if you keep the loan longer than their own break-even, often five to seven years.
How much does it cost to refinance a mortgage?
Closing costs usually run 2–5% of the loan amount, or about $6,000–$15,000 on a $300,000 loan, depending on lender fees, title insurance, appraisal and state taxes. Your Loan Estimate lists them.
Is it worth refinancing for a 0.5% lower rate?
Sometimes. On a large balance with low closing costs, half a point can break even within three years. On a smaller loan, or if you restart a 30-year term, it often does not. Enter both offers above to check.
Sources
- Consumer Financial Protection Bureau: Loan Estimate explainer
- Consumer Financial Protection Bureau: What is a Closing Disclosure?
- Consumer Financial Protection Bureau: How should I use lender credits and points?
- Freddie Mac: Primary Mortgage Market Survey (PMMS), weekly average mortgage rates
Last reviewed: Oct 17, 2026. See how we calculate and test. Calculations use the standard fixed-rate amortization formula with interest rounded to the cent each period.