Should you refinance your mortgage?
Rates drop, an offer lands in your inbox, and the monthly payment on it looks smaller than the one you have. That is usually where the thinking stops — and it is exactly the wrong place to stop. A refinance can save you real money or quietly cost you tens of thousands, and the difference is rarely the interest rate. Here is how to tell which one you are being offered.
Reviewed by Robert · Updated August 2026
What refinancing actually does
Refinancing replaces your existing mortgage with a new one. The new lender pays off your old loan, and you start again with a new balance, a new rate, and — this is the part that matters — a new term. You are not adjusting your existing mortgage. You are ending it and beginning a different one.
That distinction is the source of nearly every refinance mistake. People compare two interest rates when they should be comparing two loans.
The break-even point
Refinancing is not free. Closing costs commonly run 2%–6% of the loan amount — origination, appraisal, title, recording. You are spending real money today to buy a lower payment tomorrow, so the first question is how long it takes to earn that back.
The maths is simple: closing costs ÷ monthly saving = break-even month. Spend $6,000 to save $250 a month and you break even at 24 months. Before that point you are behind; after it, you are ahead.
Why a lower rate doesn't always save money
This is the trap, and it catches careful people.
Say you are six years into a 30-year mortgage. You have 24 years left, and you have already paid through the front-loaded years where almost every dollar went to interest. Now you refinance into a fresh 30-year loan at a lower rate. Your payment drops, which feels like a win. But you just added six years back onto the loan, and you restarted the amortization schedule — so you are back at the beginning, paying mostly interest again.
It is entirely possible to lower your rate, lower your payment, and pay more in total interest than if you had done nothing. The monthly number improves while the lifetime number gets worse.
When refinancing usually does make sense
- The rate drop is meaningful and you're staying put. A materially lower rate, a break-even you'll comfortably outlive, and no plans to move.
- You shorten the term. Moving from 24 remaining years to a 15-year loan often raises the payment but cuts total interest sharply — the opposite trade from stretching the term out.
- You're dropping mortgage insurance. If your home has appreciated enough to put you above 20% equity, refinancing out of PMI can save money independently of the rate.
- You're leaving an adjustable rate. Moving from an ARM to a fixed rate buys predictability, which has value even when the maths is close.
- You genuinely need the cash flow. Lowering the payment by extending the term costs more overall — but if the monthly breathing room is what you need, that can be a reasonable, deliberate trade. Just make it knowingly.
When it usually doesn't
- You might move before break-even. The single most common way to lose money on a refinance.
- You're near the end of your loan. Late in a mortgage most of your payment is principal. Restarting throws you back into the interest-heavy years.
- The saving is small. A marginal rate improvement can be swallowed whole by closing costs.
- You're rolling costs in without noticing. No cash upfront is appealing, but you're borrowing the fees and paying interest on them for decades.
Comparing offers properly
Every lender is required to give you a Loan Estimate — a standardized form laying out the rate, the monthly payment, and the closing costs in the same format. It exists precisely so offers can be compared like for like, and it is far more useful than an advertised rate.
Get several. Compare the closing costs as carefully as the rate, because that is the number that sets your break-even. And be wary of a "no-cost" refinance: the costs have not vanished, they have been folded into the rate or the balance.
The Consumer Financial Protection Bureau publishes free, non-commercial explainers on the mortgage process and what each Loan Estimate line means.
The short version
Do not ask "is the new rate lower?" Ask three questions instead: how many months until I've earned back the closing costs, will I still be here then, and what happens to my total interest over the life of the loan. If all three answers look good, refinance. If the third one looks bad but you need the monthly cash flow, that is a legitimate choice — as long as you are making it on purpose rather than being surprised by it later.