Refinance Break-Even: The Only Number You Need to Check

You've probably heard the "1% rule" — refinance only when you can drop your rate by a full percentage point. It's a decent rule of thumb. It's also wrong in at least half the cases it's used for.

The only honest test of whether a refinance is worth doing is the break-even point: how many months does it take for your monthly savings to pay back your closing costs? If that number is shorter than the time you'll stay in the house, refi. If it's longer, don't. Everything else is noise.

The break-even formula

Break-even (months) = Closing Costs ÷ Monthly Savings

That's it. That's the formula.

Example: Closing costs of $6,000 and monthly savings of $250 → 24 months to break even. If you'll be in the house for at least 2 more years, you come out ahead.

Worked example: should Mike refinance?

Mike bought in 2023. His current loan:

• Balance: $320,000
• Rate: 7.5%
• 27 years remaining
• Current P&I: $2,306/month

He's offered a refi:

• New rate: 5.75%
• New term: 30 years
• Closing costs: $6,000
• New P&I: $1,867/month

Monthly savings: $2,306 − $1,867 = $439/month
Break-even: $6,000 ÷ $439 = 13.7 months

If Mike plans to stay for more than 14 months, he wins. If he's thinking about selling next year, he might not.

The trap in "lower monthly payment"

Watch out for refi offers that lower your monthly payment mostly by extending your term. If you're 5 years into a 30-year and refinance into a new 30-year at the same rate, your monthly payment drops — but you just committed to 5 extra years of payments. That's not a refinance; that's a slow-motion reset.

If you refinance to a longer term, compare total interest over the life of the loan — not just the monthly payment.

What counts as "closing costs"?

Typical refi closing costs include:

• Loan origination fee: 0.5–1% of loan amount
• Appraisal: $400–$800
• Title search and title insurance: $700–$2,500
• Recording fees: $100–$300
• Prepaid interest, taxes, insurance (escrow): variable
• Credit report, notary, misc: $100–$300

Total typically runs 2–4% of the loan amount. On a $320k refi, expect $6,000–$13,000.

"No-closing-cost" refi: is it a scam?

Not a scam, but also not free. The lender covers closing costs in exchange for a slightly higher rate (often 0.25–0.50% higher). This can be a good deal if you're not sure how long you'll stay — but the break-even math still applies, you just shift the cost from upfront cash into monthly payments.

Run both scenarios (with and without closing costs) and compare 10-year total cost. The right choice depends on your timeline.

When to refinance even if break-even is long

Pure break-even isn't the only valid reason. Also consider refinancing to:

• Switch from ARM to fixed. If your adjustable-rate mortgage is about to reset higher, locking in a fixed rate may be worth it even if the immediate savings are small.
• Drop PMI. If your home has appreciated enough to get you over 20% equity, refinancing into a conventional loan can eliminate FHA MIP or PMI that would otherwise stick around.
• Shorten the term. Going from 30-year to 15-year may increase your monthly payment but dramatically reduce total interest paid.
• Pull out cash. Cash-out refinances trade equity for cash at mortgage rates — typically cheaper than a HELOC for large amounts.

When NOT to refinance

• You're less than 2–3 years from selling or moving.
• The new rate only saves you 0.25% and break-even is 4+ years.
• You'd extend the term and pay substantially more total interest even at the lower rate.
• Your credit has tanked since origination — you probably can't get today's advertised rates.
• You're underwater. If you owe more than the house is worth, most lenders won't refinance you.

The rate-drop myth

The old "1% rule" came from a time when closing costs were higher and loan balances were lower. Today, on a $500,000 loan, even a 0.5% rate drop saves ~$150/month. With $5,000 in closing costs, that's a 33-month break-even — totally reasonable if you'll stay another 3+ years.

On a $150,000 loan, a 0.5% drop only saves ~$45/month, so $5,000 closing costs take 9 years to pay back. Not worth it.

In other words: break-even scales with loan size. Don't apply a fixed rate-drop rule to loans of wildly different sizes.

Shop at least 3 lenders

Rates and fees vary widely. Get Loan Estimates (standardized forms) from at least 3 lenders on the same day — rates move daily, so same-day quotes are the only fair comparison. Compare the APR (which includes fees), not just the note rate.

The top page of the Loan Estimate shows the two numbers that matter: monthly payment and estimated cash to close. Plug both into the break-even formula and you have your answer.

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