Everyone's heard the rule: refinance when rates drop 1%. It's not wrong — but it's incomplete, and following it blindly has cost people thousands. The real question isn't "did rates drop?" It's "will I keep this loan long enough to earn back the closing costs?"
Refinancing isn't free. Closing costs typically run 2–5% of the loan amount — on a $300,000 loan, that's $6,000 to $15,000 out of pocket (or rolled into the loan, which isn't the same as free).
The formula: closing costs ÷ monthly savings = months to break even. If you'll stay in the home longer than that, refinancing usually wins. If you'll move or refinance again sooner, you just paid thousands for nothing.
Example: $8,000 in closing costs, $350/month in savings → break-even at ~23 months. Staying 10 years? Easy yes. Planning to move in a year? You'd lose money.
This single calculation beats every rule of thumb. Run it before anything else.
The old guideline says refinance when you can drop your rate by at least one percentage point. In 2026 context: the average 30-year fixed is around 7.28% (Freddie Mac, early October). If you're sitting on an 8%+ rate from the last couple of years, a full point drop is realistic — and the math usually works.
But the rule ignores loan size. On a $500,000 balance, even a 0.5% drop saves serious money. On a $120,000 balance, a full 1% might not cover closing costs. Percentage rules don't know your loan balance. The break-even test does.
Don't refinance if: you're moving within 2–3 years · you've already paid most of the interest on your current loan (restarting the clock re-amortizes you back to interest-heavy payments) · your credit score dropped significantly since you bought · you'd be stretching a nearly-paid loan back out to 30 years just to lower the payment.
That last one deserves emphasis. Refinancing a 25-year-remaining loan into a fresh 30-year loan lowers your payment — and can increase your total interest paid. Lower payment isn't the same as saving money. Check the lifetime number, not just the monthly one.
Enter your current loan, the new rate, and closing costs — see monthly savings, break-even month, and lifetime difference.
Open the refinance calculator →Typically 2–5% of the loan amount: appraisal, origination fees, title insurance, and prepaid items. "No-closing-cost" refinances exist, but they charge a higher rate instead — you're still paying, just monthly instead of upfront. Compare the lifetime cost, not the upfront one.
Temporarily, by a small amount — the hard inquiry and new account. Multiple mortgage inquiries within a 2–3 week window count as one for scoring purposes, so shop around without fear. The score usually recovers within a few months of on-time payments.
It's harder, not impossible. FHA streamline and VA IRRRL programs have looser requirements if you already have those loan types. Otherwise, the rate you qualify for might erase the savings — run the numbers honestly before paying application fees.
Not financial advice. This guide is educational. Mortgage decisions depend on your full financial picture — talk to a licensed mortgage professional before acting. Rate data: Freddie Mac PMMS, early October 2026.