Refinance break-even calculator
Find out how many months it takes for your monthly savings to recoup closing costs on a mortgage refinance — and whether the total interest saved makes the refi worth it.
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What this calculator computes
The widget runs the standard amortization formula on both your current mortgage and a hypothetical refinanced loan, then compares the two. The monthly payment for each scenario uses the same math your lender uses: principal times the monthly rate times (one plus the monthly rate) raised to the number of payments, divided by that same power minus one. The difference between the two monthly payments is your monthly savings. Dividing your total closing costs by that monthly savings gives the break-even point — the number of months before the refinance starts paying for itself. Every month you hold the new loan past that break-even date is money in your pocket relative to the old loan.
The calculator also computes the total interest paid under each scenario over the full remaining term. This second number is critical because a lower monthly payment does not always mean lower total cost. Extending the amortization period by refinancing into a fresh 30-year term resets the clock and can increase total interest even at a lower rate. The net savings figure subtracts closing costs from the total interest saved, giving you the bottom-line answer on whether the refinance is worth doing over the full horizon of both loans.
The term-extension trap
One of the most common mistakes in refinancing is looking only at the monthly payment reduction without considering the total interest impact. Suppose you are three years into a 30-year mortgage at 7.0% on a $350,000 balance, and you refinance into a new 30-year loan at 5.5%. Your monthly payment drops by roughly $350. That feels like an obvious win. But you have extended your payoff timeline from 27 remaining years to 30 — three extra years of interest payments. Whether the lower rate compensates for the longer term depends on the specifics, and this calculator shows you both sides. If the total interest saved is positive after closing costs, the rate drop is large enough to overcome the term extension. If the net number is small or negative, the refinance improves your monthly cash flow at the expense of your long-term wealth.
The disciplined solution, if you want the rate drop without the term penalty, is to refinance into a term that matches your current remaining payoff period — or shorter. A 25-year or 20-year refi at the lower rate will have a higher monthly payment than a 30-year refi, but the total interest savings become dramatic. Use the term field in the widget to compare scenarios. The best refinance is often the one where the monthly payment stays roughly the same as your current loan (by shortening the term) while the rate drops — you get the total interest savings with no break-even period to worry about because your monthly cash flow is unchanged.
How to read the results
Three numbers matter. First, the break-even in months — that is the minimum holding period required for the refinance to pay off. If you plan to sell, move, or refinance again before that date, the closing costs are a sunk loss. Second, the total interest saved — that is the difference in lifetime interest between the two loan scenarios, ignoring closing costs. Third, the net savings — total interest saved minus closing costs. A positive net savings means the refinance wins over the full term of both loans. A negative net savings means the rate is not low enough (or the term is too long, or the costs are too high) to justify the transaction, even if the monthly payment is lower.
The verdict card at the bottom summarizes the recommendation. "Refi pencils out" means the net savings are positive and you will start seeing returns after the break-even period. "Costs exceed savings" means closing costs eat the entire interest benefit. "No savings" means the new payment is not lower than the current one — typically because the rate drop is too small, the new term is shorter, or the balance is low enough that the rate difference does not produce meaningful dollar savings.
What this calculator does not cover
Several material factors are outside scope. It does not model cash-out refinancing — if you take cash out, the new balance is higher than the old one and the comparison changes fundamentally. It does not account for the tax treatment of mortgage interest (the federal deduction under post-2017 law applies to up to $750,000 of acquisition debt for primary residences, but only if you itemize rather than take the standard deduction). It does not factor in private mortgage insurance: if your current loan carries PMI and the refinance eliminates it (because you now have more than 20% equity), the effective savings are larger than the P&I difference alone — for that analysis, consult the guide on removing PMI. And it does not model the opportunity cost of closing costs — the $8,000 you spend on fees could alternatively be invested, and the expected return on that capital is a real cost of the refinance that does not appear in the break-even calculation.
When to use this alongside other tools
This calculator pairs naturally with the mortgage payment calculator, which shows the full PITI + PMI + HOA breakdown for the new loan, and with the mortgage shopping guide, which covers how to compare Loan Estimates from multiple lenders and negotiate closing costs down. The break-even analysis here assumes a known closing cost figure — getting that figure as low as possible is the other lever you can pull. Lenders in competitive markets will often match or beat a competitor's closing cost structure if you provide a competing Loan Estimate, and the difference between $8,000 and $5,000 in closing costs can shift the break-even by a full year.
For borrowers considering whether to refinance or simply make extra principal payments on the existing loan, the comparison is straightforward: extra payments reduce interest without closing costs, but they require monthly discipline and do not lower your required monthly payment (the payment stays the same; you just pay off sooner). A refinance locks in the lower payment contractually. The right choice depends on whether you need the cash-flow relief of a lower required payment or whether you have the discipline to voluntarily prepay without the structural commitment. Either way, running the numbers here first gives you the benchmark against which to measure the prepayment alternative.
Frequently asked
What is the refinance break-even point and why does it matter?
The break-even point is the number of months it takes for the cumulative monthly payment savings on the new loan to equal the closing costs you paid upfront. Before that date, you are still in the red on the refinance — the money you spent to close has not been recovered. After that date, every month of lower payments is pure savings. The reason this number matters more than any other in a refinance decision is that it directly answers the only question that counts: will you hold this loan long enough to come out ahead? The median US homeowner stays in a home roughly 13 years, but the median mortgage tenure is closer to 5–7 years because people refinance again, sell, or pay off early. If your break-even is 36 months and you expect to move within two years, the refinance is a losing trade regardless of the rate drop. Conversely, a break-even of 14 months on a home you plan to keep for a decade is almost always worth doing. The break-even period is not affected by the new loan term — only by the monthly payment difference and the closing costs. A longer new term may lower the monthly payment (and thus shorten the break-even) but increases total interest paid, which is a separate consideration.
What closing costs should I expect on a rate-and-term refinance?
Typical closing costs on a US mortgage refinance in 2026 range from 2% to 5% of the loan amount, with a national average around 2–3% for a rate-and-term refi (lower than a purchase because there is no transfer tax in many states and no realtor commission). On a $350,000 loan, that means roughly $7,000 to $17,500 in total costs. The main line items are: origination fee (often 0.5–1% of the loan), appraisal ($400–$700), title search and title insurance ($1,000–$2,500), credit report ($30–$50), recording fees ($50–$250), and prepaid items like per-diem interest and escrow funding. Some lenders offer "no-closing-cost" refinances, but that is a misnomer — they roll the costs into the loan balance or charge a higher interest rate to compensate, so you still pay; it just shows up differently. Whether rolling costs into the balance is smart depends on how long you keep the loan: if you hold it to term, you pay interest on those rolled-in costs for decades, which makes the effective closing cost much higher than the sticker price. For the cleanest analysis, pay costs out of pocket and use the actual out-of-pocket number in this calculator.
Does refinancing into a new 30-year term reset my amortization clock?
Yes, and this is the single most misunderstood aspect of refinancing. If you are 3 years into a 30-year mortgage and you refinance into a new 30-year term, you now have 30 years remaining instead of 27. Your monthly payment drops (because the balance is spread over more months), but you pay interest for 33 total years instead of 30. The monthly savings look attractive, but the total interest paid over the life of the loan is often higher than staying with the original mortgage — even at the lower rate. This calculator addresses that directly by computing total interest under both scenarios. If total interest saved is positive, the rate drop is large enough to overcome the term extension. If it is negative or barely positive after subtracting closing costs, the refinance helps your monthly cash flow at the expense of your lifetime cost. The disciplined alternative is to refinance into a shorter term — 25 years, 20 years, or 15 years — that matches or shortens your remaining payoff timeline. The monthly payment will be higher than a 30-year refi, but the total interest savings will be dramatically larger. Use the term field in the calculator to compare scenarios.
How much of a rate drop do I need for a refinance to make sense?
The old rule of thumb was "refinance if you can drop at least 1 percentage point." That guideline dates from an era of higher closing costs relative to loan sizes and is no longer precise enough to be useful. What actually matters is the interplay between three variables: the rate drop (which determines monthly savings), the closing costs (which determine what you need to recoup), and the expected holding period (which determines how many months of savings you collect). A 0.50-point drop on a $500,000 balance saves roughly $170/month. With $9,000 in closing costs, the break-even is about 53 months — just under 4.5 years. If you are confident you will keep the loan at least 5 years, that half-point drop is sufficient. On a $200,000 balance, the same 0.50-point drop saves only $68/month, and the break-even stretches past 10 years — probably not worth it unless you are also shortening the term or eliminating PMI. The honest framework is not a rate-drop threshold; it is the break-even month count versus your realistic holding period. That is exactly what this calculator produces. Run your own numbers rather than relying on any rule of thumb, because your balance, your costs, and your timeline are what determine the answer.