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Refinance · break-even
Refinance break-even in months
How many months of a lower payment it takes to recover refinance closing costs — the break-even that decides whether a refinance is worth its price.
Verified engine
What the engine returns
The break-even is the number of months of the smaller payment it takes to claw back the closing costs. Read it against your horizon: if you expect to keep the loan comfortably past that month, the trade pays; if a sale or another refinance is plausible before it, the costs are sunk.
Inputs the result is built from
Refinance closing costs
Old monthly payment
New monthly payment
How the result is derived
MethodThe closing costs divided by the monthly saving, where the saving is the old payment less the new one, gives the break-even in months.
StandardRefinance break-even relation
GuardA new payment that is not lower than the old one is refused — with no monthly saving there is nothing to recover the closing costs from, and no break-even exists.
How the break-even horizon moves with the new payment
What a break-even month count settles, and what it cannot
The relation is a payback period: the closing costs divided by the monthly saving give the number of months until the money paid at closing has been recovered. It answers only the question “when am I made whole” — every month held beyond that point is the gain, and every month short of it leaves part of the costs unrecovered.
The engine takes the two payments as given rather than deriving them, and that is where the honesty of the comparison lives. A new payment that is lower mostly because the term was reset to a fresh long schedule will pass this test easily while costing more interest over the life of the loan. The month count cannot see the term; only the reader can, and the total-interest comparison is the separate check that catches it.
What the break-even is genuinely good at is the horizon test. A household that expects to sell, move or refinance again before the break-even month is simply donating the closing costs; one that expects to hold well past it converts them into a durable saving. The figure turns a vague “is it worth it” into a date to hold the plan against.
A refinance with nothing paid at closing breaks even immediately — which is why “no-cost” offers exist. The cost has not vanished; it is usually buried in the rate, and it shows up here as a thinner monthly saving rather than as a fee. The arithmetic treats both shapes of the same deal consistently, which is what makes it useful for comparing them.
The closing costs divided by the monthly saving, where the saving is the old payment less the new one, gives the break-even in months.
When this calculation is used
- Deciding whether a quoted refinance is worth its closing costs, given how long you expect to keep the property and the loan.
- Comparing two refinance offers whose fees and payments differ, by reducing each to the month it pays for itself.
- Testing a “no-cost” refinance claim: with nothing paid at closing the break-even is immediate, and any cost buried in the rate appears as a smaller monthly saving instead.
- Working backwards with the declared reverse workflow: fixing the break-even month you could accept and solving for the new payment an offer would have to reach.
Worked example
An ordinary rate-and-term refinance: a loan some years into its schedule, an offer at a lower rate, a payment noticeably smaller than the current one, and closing costs quoted on the estimate.
The break-even is the number of months of the smaller payment it takes to claw back the closing costs. Read it against your horizon: if you expect to keep the loan comfortably past that month, the trade pays; if a sale or another refinance is plausible before it, the costs are sunk.
The relation also runs backwards: fix the break-even you could live with and the declared reverse workflow solves for the new payment an offer would need to reach. And re-check any tempting result against the total interest over each full schedule — a payment lowered by a term reset can pass the break-even test and still cost more in the end.
What each input represents
Refinance closing costs
Everything paid to make the refinance happen — lender fees, third-party fees, anything that would not have been spent otherwise. Costs financed into the new balance still belong here: they are paid either way, just later and with interest.
Old monthly payment
The payment on the loan as it stands. Use the principal-and-interest amount rather than an escrow-loaded total, so that both payments in the comparison describe the same thing.
New monthly payment
The payment on the offered loan, on the same basis as the old one. If it is lower mostly because the term was reset rather than because the rate fell, the break-even will look good while the lifetime interest does not — a comparison worth running separately.
Assumptions and limits
- The monthly saving is constant for as long as it takes to break even — both payments are fixed, not adjustable.
- Break-even is measured in undiscounted months: money recovered later is treated as worth the same as money paid today.
- The two payments describe the same thing — principal and interest on comparable terms — and any change in the term is left for the reader to judge.
- Closing costs are counted once, up front; costs rolled into the new balance are not additionally charged interest here.
- Nothing after the break-even month is modelled: total interest over each full schedule is a separate comparison.
What the guards protect against
- A new payment that is not lower than the old one is refused — with no monthly saving there is nothing to recover the closing costs from, and no break-even exists.
- Both payments must be greater than zero, because a schedule with no payment is not a loan being compared.
- Closing costs cannot be negative, and figures outside a realistic range are refused rather than answered, because they would not describe any refinance actually on offer.
Provenance
Refinance break-even relation
The closing costs divided by the monthly saving, where the saving is the old payment less the new one, gives the break-even in months.
Educational reference, not financial advice, and not a total-cost comparison between the two loans. The signed pack carries its own citation; the page reports the verification state of the release it mounted rather than asserting one.