Mortgage Refinance Break Even Calculator
Find the month a refinance repays its costs — and check the lifetime interest, because a lower rate on a fresh 30-year clock can cost you more than doing nothing.
Mortgage Refinance Break Even Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Principal and interest only — taxes and insurance are unaffected by a refinance.
- Assumes the loan is held to its scheduled maturity in the lifetime comparison.
- Ignores the time value of money in the simple break-even, as the industry convention does.
In short: Cash break-even lies when the term resets. Dropping 6.90% to 6.00% saves 369.11 a month and repays 9,500 of costs in 25.74 months — while adding 56,807.17 of lifetime interest.
Formula
break-even months = closing costs ÷ monthly saving
valid only when new term ≤ remaining term
[('cash break-even', 'when the saving repays the costs'), ('term reset', 'extra months that inflate the monthly saving'), ('term-matched', 'same remaining months at the new rate'), ('same-payment', 'keep the old payment, shorten the loan')]
Worked Example
- Compute the current payment over the months actually remaining.
- Compute the new payment on the proposed term.
- Divide closing costs by the saving for cash break-even.
- Compare TOTAL remaining interest on both loans.
- Re-run with the term matched to your remaining months.
268,000 at 6.90% with 264 months left costs 1,975.91 a month. Refinancing to 6.00% on a fresh 360 months drops it to 1,606.80 — saving 369.11, repaying 9,500 of costs in 25.74 months. But remaining interest rises from 253,639.18 to 310,446.35: 56,807.17 MORE despite the lower rate. Matching the 264-month term gives 1,830.64, a smaller 145.27 saving and a 65.40-month break-even, but a genuine 38,350.35 lifetime saving. Best of all: take 6.00% and keep paying 1,975.91 — the loan clears in 228 months, saving 71,132.62.
Strengths & Limits Of This Model
Where this engine is strong
- Computes lifetime interest, not just the payment
- Warns when the term reset invalidates the break-even
- Models the term-matched and same-payment alternatives
Where it stops
- Nominal break-even
- Excludes taxes and insurance
Practical Use Cases
Testing a refinance offer
Finding the month it actually pays for itself.
Exposing the term reset
Comparing lifetime interest, not just payment.
Choosing a term
Matching the new term to your remaining months.
Planning a move
Checking break-even against your horizon.
Deploying the saving
Modelling the same-payment acceleration.
Methodology & Editorial Standards
The current payment is computed over the months ACTUALLY remaining rather than the original term, which is where most comparisons go wrong. Cash break-even divides costs by the payment reduction, and the page states explicitly that this test is valid only when the new term does not exceed the remaining one. Total remaining interest is computed for both loans and the difference is reported even when it contradicts the break-even. A term-matched refinance and a same-payment acceleration are modelled alongside, because they are usually better than the offer as presented.
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Mortgage Refinance Break Even Calculator — 10 Expert FAQs
10 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
How do you calculate a refinance break-even point?
Divide total closing costs by the monthly payment reduction. The result is how many months you must keep the loan for the refinance to repay itself. It is a valid test only when the new term is no longer than what you had remaining.
Why can a lower rate cost me more?
Because refinancing into a fresh thirty-year term adds months of interest. If you are years into a loan, restarting the clock can raise total interest even at a materially lower rate. The payment falls every month while the lifetime cost rises.
Should I match my remaining term?
Usually, yes. Refinancing twenty-two remaining years into a twenty-two-year loan rather than a fresh thirty captures the rate improvement without restarting amortisation. The monthly saving is smaller and the break-even is later, but the lifetime saving is real rather than borrowed.
What if I keep paying my old payment?
That is frequently the best available move. Take the lower rate, keep the old payment, and the difference goes entirely to principal. You shorten the loan substantially and save more total interest than either of the conventional options.
Do rolled-in closing costs count?
Absolutely. Financing a cost does not remove it — it moves it into the balance where it accrues interest for the life of the loan. Include rolled costs in your break-even numerator, and remember they also raise the payment and so reduce the saving.
Is a no-closing-cost refinance really free?
No. The lender recovers the cost through a higher rate or by adding it to the balance. There is no upfront outlay and therefore no conventional break-even, which can genuinely suit a short horizon — but over a long hold it is the more expensive route.
What rate drop justifies refinancing?
Rules of thumb such as one per cent are unreliable because the answer depends on your balance, your remaining term and your costs. A large balance justifies a small rate drop; a small balance may not justify a large one. Run the break-even rather than the rule.
Should escrow deposits count as closing costs?
No. Property tax and insurance are payable whether or not you refinance, and you normally receive a refund of the old escrow account. Including them overstates your costs and pushes the break-even artificially far out.
Does removing mortgage insurance change the calculation?
It improves it substantially, because eliminating the premium adds to your monthly saving without any rate change at all. For FHA borrowers with permanent mortgage insurance, this is often the entire reason a refinance makes sense.
What if I plan to move soon?
Then the break-even month is the only figure that matters. Moving or refinancing again before that date means you paid the costs and never recovered them, no matter how attractive the rate looked at signing.