Mortgage Refinance Break-Even: Payment Savings vs Cost at Sale
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Compare simple fee recovery with cash paid plus debt remaining at the same holding date. Reconcile an original fixed-rate example and an early-sale warning.
Simple payment break-even divides eligible net upfront fees by positive monthly payment savings. A fuller same-date comparison adds cash paid and remaining principal for each loan. Those measures can give different answers, especially when loan terms change.
A refinance can cost more at year one and save later
Use the same exit month for both options. This worked scenario starts with a $250,000 unpaid balance, 6.5% fixed current note rate, 300 months remaining, a 5.5% fixed new note rate, 300 new months and $6,000 upfront charges, with no financed fees or additional monthly costs. The figures below are generated and regression-checked against our amortization engine, not lender quotes.
| Common exit date | Advantage | What this means |
|---|---|---|
| Month 12 | $3,501.93 extra cost | Upfront fees have not been recovered by this exit date. |
| Month 36 | $1,472.58 saving | The remaining-debt-adjusted comparison favors refinancing. |
| Month 60 | $6,394.53 saving | At the assumed five-year exit, modeled saving is positive. |
The first nonnegative same-date savings month is month 29 in this example. That threshold is not guaranteed to persist for every input or future interest-rate environment. The simpler fee ÷ monthly payment difference does not include the remaining loan balance. Change holding period and fees in the interactive refinance calculator; review shorter versus longer mortgage terms if the new payoff date differs. This is an undiscounted comparison; it does not estimate taxes, investment returns or home-price changes.
Which mortgage refinance break-even should you calculate?
Two legitimate comparisons answer different questions. The payment-savings method asks when lower monthly payments repay eligible fees paid today; the common-date method asks which mortgage has less cash spent plus principal still owed on the same exit date. They are not interchangeable, particularly when you change the length of the loan.
| Your question | Method | What can go wrong |
|---|---|---|
| How many months until $6,000 fees recover from $250 monthly payment savings? | $6,000 ÷ $250 = 24 months when savings remain constant and fees are not financed | Ignores changes in remaining debt; a shorter term with a higher payment has no positive-payment-saving threshold |
| Would I be ahead at sale in month 60? | Compare each option's cumulative payment cash and unpaid principal at month 60, including net upfront fees once | Comparing monthly payments alone can mistake postponed principal for true savings |
| Are two lender offers comparable? | Match loan type, remaining/new terms, note rate, closing charges, credits, mortgage insurance and holding dates | Different cash-to-close and escrow assumptions may distort the comparison |
The refinance calculator provides both a conditional simple threshold and the fuller cash-plus-debt schedule. Check the closing-fee reconciliation before entering financed fees. The CFPB recommends comparing loan estimates including rate, costs, lender credits and borrower cash-to-close. These figures are hypothetical and not a lender offer.
Start with the narrow payment-savings question
If net upfront transaction fees are $6,000 and a stable monthly saving is $250, simple recovery is $6,000 / $250 = 24 months. At month 18 only $4,500 of payment savings has accumulated, leaving $1,500 unrecovered on that cash basis. A planned sale at month 18 arrives before this 24-month threshold.
This method assumes savings persist, both schedules are still in their relevant payment periods, and no fees are financed into principal. With no positive monthly saving there is no simple payment-savings break-even. That does not prove a shorter loan has no cost advantage. Use the mortgage refinance calculator to inspect both cash and balances.
Compare cash and debt at one common date
For the current loan, cost at holding date h = payments through h + remaining principal at h. For the refinance, cost = net upfront fees + new payments through h + new remaining principal at h. Subtract refinance cost from current cost; a positive difference favors refinancing under these assumptions. The common starting debt cancels from the difference.
These are undiscounted comparative amounts, not a market valuation. They include principal so that a loan cannot look cheaper merely by postponing repayment. Keep the same property and initial debt, and account separately for taxes, insurance and other housing expenses that differ. Cash-out borrowing is outside this rate-and-term example.
Reconcile one fictional five-year comparison
Current balance is $250,000, fixed note rate 6.5%, with 300 months remaining. The new loan is $250,000 at an assumed 5.5% fixed note rate for 300 months. Upfront transaction fees are $6,000, financed fees and lender credits are zero, and the holding period is 60 months. Other housing costs and mortgage insurance are zero in both comparison inputs. These are fictional rates, not lender offers.
| Measure | Keep current | Refinance |
|---|---|---|
| Monthly principal and interest | $1,688.02 | $1,535.22 |
| 60 payments | $101,281.20 | $92,113.20 |
| Principal after payment 60 | $226,405.26 | $223,178.73 |
| Net upfront fees | $0.00 | $6,000.00 |
| Cash plus remaining debt | $327,686.46 | $321,291.93 |
The refinance advantage at month 60 is $6,394.53 using full-precision balances before rounding. Payment savings are $152.80 per month, so the simple threshold is ceil($6,000 / $152.80) = 40 months. Payment savings of $9,168 less fees give only $3,168; the additional $3,226.53 of lower remaining debt explains the rest of the same-date advantage.
Check the date you actually expect to exit
A recovery date beyond the planned sale or another refinance is not recovered within your plan. Test shorter, likely and longer holding dates. A first favorable date need not remain favorable at all later dates if a long new term continues after the old loan would be paid off. Inspect the schedule rather than treating break-even as a permanent guarantee.
Financed fees change the debt path
Rolling $5,000 of fees into a $250,000 refinance creates $255,000 new principal. Do not also put that same $5,000 in upfront fees. The fee and its interest are reflected in payments plus remaining debt; a simple division using zero upfront cost would hide the economic cost. Classify each charge using the closing-cost and financed-fee ledger.
What this comparison leaves out
The model assumes fixed-rate fully amortizing loans, scheduled monthly payments and no extra principal, prepayment penalties, cash-out, ARM resets or tax effects. Note rate/12 drives interest; APR is not the accrual rate. Temporary escrow/prepaid cash affects liquidity but is excluded from irreversible transaction fees here; refund timing is not modeled. Opportunity cost and discounting can change a decision and require explicit assumptions.
Common mistakes
Using the original current-loan term instead of months remaining; comparing payments without payoff balances; counting financed charges twice; and comparing 60 months of one option with a full lifetime of another are inconsistent. For a term change, read the shorter-versus-longer-term comparison before relying on the lower-payment label.
Sources and independent arithmetic
CFPB’s Loan Estimate explainer distinguishes principal-and-interest payments, other housing charges and closing disclosures. OpenStax explains loan amortization. We independently reconciled the fictional schedules with a separate Decimal implementation using rounded regular payments and an adjusted final payoff. Actual lender timing and rounding may differ.
Frequently asked questions
What if I sell before the simple break-even month?
The assumed payment savings have not recovered the eligible upfront fees by that date. Also compare balances and total cash at your actual holding date.
Does no monthly saving mean refinancing cannot reduce costs?
No. A shorter term can have higher payments and lower interest or remaining debt. Evaluate matched-date cost and affordability separately.
Is payment break-even the same as total-cost break-even?
No. Simple recovery ignores differences in principal remaining, while a same-date cost comparison includes them.
Why not use APR in the payment formula?
The scheduled interest accrues using the note rate under this model. APR is a broader financing-cost disclosure and is not the monthly accrual rate.
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Planning estimates only—not accounting, tax, legal or lending advice.