The Ledger / Cash-Out Refinance
The Cash-Out Refinance Break-Even, Worked Properly
The usual break-even calculation ignores the most expensive part: the rate you already hold on the balance you are refinancing anyway.
Ellis Nakamura · July 24, 2026
If your existing rate is below what the market offers today, a cash-out refinance repays that gap on your entire balance — not just on the cash you take. Price that before anything else.
- +One loan, one payment, usually at a fixed rate
- +Can genuinely be the cheapest route to a large sum when your existing rate is at or above market
- +Resets the whole balance to a predictable structure
- −Surrenders your existing rate on the entire balance, not just the cash portion
- −Heaviest closing costs of the three equity routes — it is a full origination
- −Re-amortising resets the clock and can raise lifetime interest even at a similar rate
The cash-out refinance is the most commonly mis-analysed of the three equity routes, because the standard break-even calculation asks the wrong question.
The usual version: divide closing costs by monthly payment savings, get a number of months, decide whether you will stay that long. That is a fine method for a rate-and-term refinance. It is badly incomplete for a cash-out.
What the standard method misses
A cash-out refinance does not just add debt. It replaces your existing mortgage, including its rate.
If you hold a rate below what the market offers today, you are not merely paying closing costs to access equity. You are re-pricing your entire remaining balance upward. On a balance of a few hundred thousand, a rate difference of even a point or two is a large recurring cost that continues for the life of the loan — and it applies to the money you had already borrowed at the better rate, not only to the new cash.
That is the number that decides this, and it is missing from most break-even calculators.
The comparison that actually answers it
Model three columns over the same horizon — say the number of years you realistically expect to hold the property:
Column A — do nothing. Your current mortgage, unchanged.
Column B — cash-out refinance. New balance (old balance plus cash plus rolled costs), at today's rate, on a new term. Total payments over the horizon, plus remaining balance at the end.
Column C — keep the mortgage, add a second lien. Your existing mortgage untouched, plus a HELOC or equity loan for the cash only, at its own rate and costs.
Then compare B and C against A, over the same horizon, on the same basis: total paid plus ending balance.
When your existing rate is comfortably below market, Column C usually wins and often wins by a wide margin, because it prices the new borrowing at today's rate while leaving the old borrowing at yesterday's. When your existing rate is at or above market, Column B frequently wins and the cash-out is genuinely the right instrument.
That is the entire decision. Everything else is detail.
The re-amortisation trap
A second, quieter cost: refinancing resets the amortisation schedule.
Early in a mortgage, most of each payment is interest; later, most is principal. Someone a decade into a thirty-year loan has reached the part where principal accumulates quickly. Refinancing into a fresh thirty-year term returns them to the interest-heavy beginning. The monthly payment may fall — that is what makes it feel like a saving — while lifetime interest rises.
This is not an argument against refinancing. It is an argument for comparing on total cost over your horizon plus ending balance, never on monthly payment alone. If you do refinance, consider a shorter term to avoid re-extending, if the payment supports it.
Costs that belong in the arithmetic
A cash-out refinance is a full mortgage origination: origination or discount points, appraisal, title search and lender's title insurance, recording, and prepaid escrow. Rolling them into the balance does not avoid them — it finances them, at your new rate, for the life of the loan.
Get the Loan Estimate. It is a standardised form specifically so you can compare offers line by line, and it is the single most useful document in this entire process.
What we would do
Work the three columns before talking to anyone about rate. If your existing rate is materially below market, start from the assumption that a second lien is the cheaper structure and make the cash-out prove otherwise. If your existing rate is at or above market, the cash-out is a genuine contender and the ordinary break-even math applies.
And in either case, compare over your real holding period — not over thirty years you do not intend to be there.
How to use this entry: every figure above is illustrative arithmetic built on stated assumptions, published so you can substitute your own. Rates, fees, ceilings and eligibility vary by lender, property, credit profile and jurisdiction, and change over time. Confirm against your own Loan Estimate, disclosure forms and agreement before acting. Home Finance & Credit Lines is an editorial desk, not a lender or adviser; this is reporting, not personalised advice. Borrowing secured against your home puts your home at risk.
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