Refinance break-even point
By David Chen · Published September 20, 2026
A refinance lowers your interest rate, and the marketing stops there. The part that matters is arithmetic you have to do yourself: a refinance costs money at closing, and it only makes sense if the monthly saving outlives those costs. The month where the two cross is the break-even point.
The calculation
Break-even months = total closing costs ÷ monthly payment saving
That is the whole formula. It is simple enough that the difficulty is not the maths but the two inputs — knowing all your costs, and knowing how long you will actually keep the loan. Most of this guide is about those two things.
A worked example with four options
Suppose you owe $350,000 at 7.50% with 27 years remaining. Your principal and interest payment is $2,522.57, and if you simply keep paying, the remaining interest bill is $467,312. Closing costs on a refinance are $4,500.
| Option | Rate | Monthly P&I | Monthly saving | Break-even | Total interest from here |
|---|---|---|---|---|---|
| Keep existing loan | 7.500% | $2,522.57 | — | — | $467,312 |
| Refinance, 25 years | 6.250% | $2,308.84 | $213.73 | 21.1 months | $342,653 |
| Refinance, 30 years | 6.250% | $2,155.01 | $367.56 | 12.2 months | $425,804 |
| Refinance, 30 years | 6.000% | $2,098.43 | $424.14 | 10.6 months | $405,434 |
| Refinance, 20 years | 6.500% | $2,609.51 | −$86.94 | none on payment | $276,281 |
Break-even = $4,500 closing costs ÷ monthly saving. Total interest is the sum of all remaining payments less the $350,000 balance. Produced by our loan calculator and independently recomputed.
Look at the second and third rows together, because they show why break-even alone is a dangerous metric.
The term-extension trap
The 30-year refinance at 6.25% has the best-looking numbers in the table if you only read the middle columns: it cuts your payment by $367.56 a month, the largest saving of any option, and it pays for itself in just 12.2 months. On a break-even screen it wins easily.
Now read the last column. Over the remaining life of the loan it saves only $41,509 in interest — because you have reset the clock and now have 30 years of payments ahead of you instead of 27. You bought a lower rate and gave back most of the benefit in extra time.
The 25-year refinance at the same 6.25% is the opposite profile. It saves less each month ($213.73) and takes longer to break even (21.1 months), but it removes $124,659 of interest — three times the 30-year option's saving.
The option with no break-even at all
The final row is the most instructive. Refinancing into a 20-year loan at 6.50% raises your payment by $86.94 a month, so there is no payment-based break-even — by that metric alone you would reject it immediately. And yet it saves $191,031 in interest, the largest saving in the table by a wide margin.
This is a deliberate trade: a higher monthly commitment in exchange for a much shorter borrowing period. Whether it is right depends entirely on whether your budget can carry the higher payment and whether the loan term matters to you at all. It illustrates that break-even is a tool for one kind of refinance — the payment-reduction kind — and a poor tool for the term-reduction kind.
What actually counts as closing costs
The break-even gets worse the more costs you omit, and borrowers routinely omit half of them. Put every one of these into the calculation:
- Loan origination fee
- Application, underwriting and processing fees
- Appraisal fee
- Title search and lender's title insurance
- Credit report fee
- Recording and transfer fees
- Discount points, if you are buying the rate down
- Prepaid interest for the partial month at closing
- Escrow funding and any escrow shortfall on the outgoing loan
- Mortgage insurance premiums, where applicable
Your Loan Estimate lists them in sections A through C, with a “Estimated Cash to Close” figure on page 1. Use that number, not a total someone quoted you verbally.
Rolling costs into the loan
Many lenders will add closing costs to the new balance instead of collecting them in cash. This does not make them disappear — you now pay interest on them for the life of the loan. If you refinance $350,000 with $4,500 of costs rolled in, your new principal is $354,500 and every figure in the table above shifts slightly. It is a legitimate cash-flow choice, but for break-even purposes the cost is still real and still counts.
How long will you actually keep the loan?
The break-even month is only meaningful against your real holding period. Common rules of thumb, with their reasoning:
| Break-even | Read it as |
|---|---|
| Under 18 months | Comfortable. You would need a very near-term move to lose money. |
| 18–36 months | Reasonable if you are confident you are staying put for at least three years. |
| 36–60 months | Marginal. A job change, a move or a further rate drop can wipe out the benefit. |
| Over 60 months | Treat with suspicion. You are betting five-plus years of stability on a modest rate improvement. |
Be honest about your own history. If you have moved twice in eight years, you do not have a five-year horizon regardless of what you intend. Break-even maths rewards realism, not optimism.
Reasons not to refinance, even when the maths works
- You are close to paying off the loan. The interest-savings argument weakens dramatically in the final years, because most of each payment is already principal. Run your remaining schedule in the loan calculator — if you are past the crossover point described in our amortization guide, a refinance has little left to save.
- You would be extending a term you do not want extended. Lower payment, more years, similar total cost is a common and disappointing outcome.
- You would reset mortgage insurance. Where mortgage insurance applies, refinancing can restart a premium you were close to shedding.
- You are doing it for cash-out reasons rather than rate reasons. Tapping equity converts a secured loan into spendable money, which is a different decision with a different risk profile. Do the offer comparison as carefully as you would for a new purchase, not less carefully.
- Your credit or income has changed. A refinance application is a fresh underwriting decision. A rate you can no longer qualify for is not a rate.
A refinance checklist
- Get your current balance, rate and remaining term from your servicer.
- Get a Loan Estimate from at least two lenders, and read the cash to close on page 1 and the APR on page 3.
- Compute the monthly saving for the same remaining term first — this is the apples-to-apples comparison that isolates the rate reduction from the term change.
- Then compute the shorter-term and longer-term variants and compare the total-interest column, not just the payment.
- Divide the cash-to-close figure by the monthly saving to get break-even months.
- Compare that number against a pessimistic estimate of how long you will stay.
- Run every candidate scenario through the loan calculator yourself so you are reading figures you generated, not figures you were shown.
The short version
Closing costs divided by monthly saving gives you the break-even month. Use the full cash to close, not the headline fee, and compare the break-even against a realistic estimate of how long you will keep the loan. Then — before you sign — put the total-interest figures for a same-term refinance, a shortened term and a lengthened term side by side, because the option with the fastest break-even is frequently not the option that saves you the most money.
Frequently asked questions
How do I calculate my refinance break-even point?
Divide the total closing costs by the monthly payment saving. In the worked example on this page, $4,500 of costs against a $367.56 saving gives 12.2 months. Use the full cash-to-close figure from page 1 of your Loan Estimate rather than a total quoted verbally, because the costs you leave out are precisely the ones that make the break-even look better than it is.
What counts as a good break-even period?
Under 18 months is comfortable; 18 to 36 months is reasonable if you are confident you are staying put; 36 to 60 months is marginal; and anything over 60 months should be treated with suspicion. The number is only meaningful against your realistic holding period rather than your intended one — if you have moved twice in eight years, you do not have a five-year horizon.
Does refinancing always lower my monthly payment?
No. Shortening the term usually raises it. Refinancing a $350,000 balance from 7.50% with 27 years left into a 20-year loan at 6.50% raises the payment by $86.94 a month, so there is no payment-based break-even at all — and yet that same option saves $191,031 in interest. Break-even is a tool for payment-reduction refinances and a poor tool for term-reduction ones.
Should I refinance if I plan to move soon?
Usually not, because the closing costs are paid up front while the saving accrues month by month. If your break-even is 21 months and you expect to move in twelve, you lose money on the transaction even though the new rate is genuinely lower. The exception worth considering is a lender-credit refinance with little or no cash cost — but check whether that credit comes with a prepayment penalty that would claw the benefit back.
Is a no-cost refinance really free?
No. A so-called no-cost refinance means the lender covers the closing costs in exchange for a higher interest rate, so the cost moves off the closing table and into the loan. That can be a sensible trade if you expect to keep the loan only a short time, and a poor one if you keep it for years. Ask what rate you would have been offered without the credit — the gap is the price you are paying.
Related guides
- How to refinance a mortgage — Why a lower rate can still cost you more: a 6.50% to 6.00% refinance cuts the payment by $371.38 and adds $93,849 of interest, while the same rate on a 20-year term saves $17,788.
- Cash-out refinance vs HELOC — A cash-out refinance looks cheaper but reprices the loan you already had: $110,405 more interest in total, with a monthly payment $257.47 lower than the HELOC route.
- Closing costs explained — The three groups on a closing bill, what can be negotiated and what cannot, and the arithmetic of discount points — including why buying twice as many points barely changes the break-even month.
- 15-year vs 30-year mortgage — The same loan on both terms, side by side: what the shorter term saves, what it costs each month, and the affordability test that decides it.
Run your own numbers in the loan calculator.
Calculators for this topic
- Mortgage calculator — Monthly payment with property tax, home insurance, HOA and PMI folded in — the number that actually leaves your account, not just principal and interest.
- Amortization schedule — The full month-by-month and year-by-year breakdown of a fixed-rate loan, and how much interest an extra payment removes from the end of it.
- Home affordability calculator — Works the mortgage question backwards: start from your income, debts and down payment, and find the price you can actually carry rather than the price a lender will approve.
This guide is educational and is not financial advice. Figures were produced by our calculator and independently recomputed before publication; your lender's own documents govern your loan. Spot an error? Tell us — see also our disclaimer.