Refinance Break-Even
A refinance costs money at closing and returns money every month, so the first question is how many months it takes to get even. The second question, which is easier to skip, is what the new term does to total interest. This guide computes both on an illustrative example, including a case where the payment falls and the total cost rises. Run your own numbers in the free mortgage calculator.
In short: the break-even month is closing costs divided by the monthly saving. A longer new term shortens that break-even and can still raise total interest, which is why both numbers belong in the decision.
The framework
A refinance replaces one loan with another. It costs money at closing and returns money every month, so it is a break-even problem in the same shape as any other up-front purchase. Two figures describe it. The break-even month is the closing costs divided by the monthly payment saving. The total-cost comparison is the interest remaining on the current loan against the interest on the new one, plus the closing costs.
Those two figures can disagree, and the disagreement is the interesting part. A refinance can break even quickly on payment and still cost more overall, because the payment saving and the interest saving are produced by different things: the rate lowers both, while a longer term lowers the payment and raises the interest.
A worked example
The example uses an illustrative current loan with $280,000 remaining and 25 years left at 7%, refinanced at 6% with $4,000 in closing costs. The new loan is priced over two terms: 25 years, matching what is left, and a fresh 30 years.
| Option | Monthly P&I | Change | Interest remaining | Break-even |
|---|---|---|---|---|
| Keep the current loan | $1,978.98 | – | $313,694.53 | – |
| Refinance, 25-year term | $1,804.04 | -$174.94 | $261,213.18 | 23 months |
| Refinance, 30-year term | $1,678.74 | -$300.24 | $324,346.93 | 13 months |
The 25-year refinance lowers the payment by $174.94 a month, so $4,000 of costs is recovered in 22.9 months, or 23 months. It also cuts interest from $313,694.53 to $261,213.18, a saving of $52,481.35, or $48,481.35 after costs. Both measures agree.
The term-reset trap
The 30-year version looks better on the payment line and worse everywhere else. It lowers the payment by $300.24 a month, nearly double the 25-year saving, and recovers the $4,000 in 13.3 months, or 13 months. That is the number a payment-focused comparison stops at.
Total interest tells the other half. Keeping the current loan costs $313,694.53 in remaining interest. The 30-year refinance costs $324,346.93, which is $10,652.40 more, and $14,652.40 more once the closing costs are added. A full percentage point of rate reduction still ends up more expensive, because five extra years of borrowing outweighs it.
That is not an argument against the 30-year option. A lower required payment has real value to a household that needs the room, and the calculation above is the price of that room stated honestly. It is an argument against reading the payment saving as though it were the whole result.
There is a middle route. Taking the 30-year loan and voluntarily continuing to pay the old $1,978.98 payment retires it in 247 months, or 20 years 7 months, with $207,676.49 of interest, $106,018.04 less than keeping the current loan before costs. That keeps the lower required payment as a fallback while capturing the rate improvement, which is the same logic the 15- versus 30-year comparison applies to a purchase.
When the math clearly fails
Small rate improvements are the common case. Refinancing the same $280,000 balance from 7% to an illustrative 6.75% over 25 years lowers the payment from $1,978.98 to $1,934.55, a saving of $44.43 a month. Against $4,000 in costs the break-even is 90 months, or 7 years 6 months. Any sale or second refinance before then leaves the transaction underwater, and the full-term saving after costs is only $9,328.84.
Rolling the closing costs into the loan does not fix a weak refinance; it relocates the cost. On the 30-year version above, financing $4,000 makes the loan $284,000 and raises interest to $328,980.46, which is $15,285.93 more than keeping the current loan. The break-even framing disappears because nothing is paid up front, but the money is still spent.
- A likely move or payoff before break-even. The costs are sunk on closing day and the savings arrive monthly.
- A rate improvement too small to clear the costs in reasonable time. The break-even months figure states this directly.
- A new term long enough to erase the interest saving. Compare total interest, not only the payment.
- Mortgage insurance added by the new loan. Where a refinance puts the loan above 80% loan-to-value, the new premium belongs in the monthly comparison; the PMI page covers those rules.
Cash-out is a different decision
A cash-out refinance takes equity as cash and raises the balance, which means the comparison above no longer describes it. Two questions are being answered at once: whether the new mortgage terms are better than the old ones, and whether borrowing against the home is the right way to fund whatever the cash is for. Those are worth weighing separately, because a refinance that fails the rate test can still be chosen for the cash, and a refinance that passes it can still be a poor way to borrow.
Run the comparison: put the current balance, rate, and remaining term into the mortgage calculator and note the payment and total interest, then run it again with the new rate and term. The difference in payment divided into the closing costs is the break-even month for your loan.
Frequently asked questions
How do you calculate a refinance break-even point?
Divide the closing costs by the monthly payment saving. In the illustrative example on this page, $4,000 of costs against a $174.94 monthly saving on a 25-year refinance gives 23 months, so the refinance is recovered after about 1 year 11 months of payments.
Can refinancing lower the payment but cost more?
Yes, and it is common when the new loan resets to a longer term. In the example on this page, refinancing $280,000 from 7% with 25 years left to 6% over a fresh 30 years lowers the payment by $300.24 a month and raises total interest by $10,652.40, or $14,652.40 once closing costs are counted.
When does refinancing not make sense?
When the home is likely to be sold or the loan paid off before the break-even month, when the rate improvement is too small to clear the costs in reasonable time, or when the new term is long enough to erase the interest saving. Refinancing to 6.75% in the example takes 90 months to break even.
Does rolling closing costs into the loan avoid the cost?
No, it relocates it. Financing $4,000 on the 30-year example raises the loan to $284,000 and pushes total interest to $328,980.46, which is $15,285.93 more than keeping the current loan. Nothing is paid up front, but the money is still spent.
More mortgage guides
- 15- vs 30-year mortgage
- Closing costs explained
- Discount points and the break-even math
- Biweekly mortgage payments
- Mortgage terms glossary
This guide is general information, not financial advice. Rates and figures vary. Confirm all numbers with your lender.
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