A buddy of mine called me last month genuinely excited. He’d been quoted a refinance that would drop his mortgage rate from 7.25% to 6.58%, and every article he’d read said to refinance if you can lower your rate. He wanted a high-five.

Instead I asked him how long he was staying in the house. Three years, maybe less, his wife’s job was likely relocating them. I ran his numbers while we were on the phone, and the refinance was going to lose him money. Not because the rate wasn’t better. Because he’d be gone before the savings ever caught up to the cost.

That gap, between when you pay for a refinance and when it starts paying you back, has a name. It’s the break-even point, and it’s the only number that actually decides whether refinancing is worth it.

→ Run your numbers: worthitcalculators.com/refinance-break-even

Refinancing isn’t free, and that’s the whole point

Here’s what the “just lower your rate” advice leaves out: a refinance is a brand-new loan, and new loans have closing costs. Appraisal, lender fees, title, recording, sometimes points, it adds up to roughly 2% to 5% of the loan amount. On a typical mortgage that’s often $6,000 to $9,000 out of pocket or rolled into the balance (industry averages, 2026).

You don’t pay that back in a lump. You pay it back slowly, through a smaller monthly payment. Which means a refinance is really a trade: a known cost today in exchange for savings that dribble in month by month for years. Whether it’s a good trade depends entirely on whether you stay long enough to collect those savings.

That’s why the rate alone can’t answer the question. A great rate with high costs and a short stay is a bad refinance. A modest rate improvement with low costs and a long stay is a great one.

How to calculate your break-even in one line

The formula is refreshingly simple:

Break-even (in months) = total closing costs ÷ monthly savings

That’s it. Add up what the refinance costs you, divide by how much lower your new payment is, and you get the number of months until you’ve recouped the cost. Every month after that, you’re actually ahead.

Let me run my friend’s real numbers. On his $300,000 balance, dropping from 7.25% to 6.58% took his payment from about $2,047 to $1,912, a savings of $135 a month. His closing costs were coming in around $9,000.

$9,000 ÷ $135 = about 67 months. Roughly five and a half years before the refinance breaks even.

He’s planning to move in three. He’d have paid $9,000 to save about $135 a month for 36 months, around $4,860 in savings against $9,000 in cost. A net loss of roughly $4,000, on a deal that looked like an obvious win because the rate was lower.

Why the “1% rule” can steer you wrong

There’s a popular rule of thumb that you should refinance any time you can drop your rate by a full point. Sometimes that’s right. But it’s a rule about the rate, and the rate isn’t what decides it.

Watch how much the break-even moves when you change the inputs instead of the rate. Take that same $300,000 loan, but this time a full one-point drop, from 7.58% to 6.58%. Now you’re saving about $202 a month. At $7,500 in closing costs, the break-even is about 37 months, a little over three years. A bigger rate drop shortens the break-even because each month saves you more.

But even a full-point drop breaks even in three-plus years, which is still a loss if you’re moving in two. And a smaller rate drop with low closing costs and a decade left in the home can be a clear win the “1% rule” would tell you to skip. The rule is a shortcut for the real calculation, and shortcuts break in exactly the cases that cost you money.

The three things that actually move your break-even

Your closing costs. Lower is better, obviously, but shop them, lender fees vary a lot, and a “no-cost” refinance usually just buries the costs in a higher rate, which changes the math rather than removing it. Get the full itemized estimate before you decide.

Your monthly savings. This is driven by the size of the rate drop and your loan balance. A bigger balance means a given rate cut saves more per month, which pulls the break-even closer.

How long you’ll stay. This is the input people skip, and it’s the one that flips the whole decision. Your break-even month only matters relative to how long you’ll keep the loan. If you’ll be there well past break-even, refinance with confidence. If you’ll be gone before it, don’t, regardless of how good the new rate looks.

What about cash-out or shortening the term?

The break-even math is cleanest for a straight rate-and-term refinance, where you’re only trying to lower your payment. If you’re refinancing to pull cash out or to shorten your term, say, going from a 30-year to a 15-year, you’re solving for something other than a lower payment, and break-even isn’t the only lens.

But even then, the closing costs are real, and it’s still worth knowing how long it takes for the benefit to justify the cost. Don’t let a different goal talk you out of running the numbers.

FAQ

What is a good break-even point for a refinance? A common guideline is that a refinance makes sense if you’ll stay in the home well beyond the break-even month, often people look for break-even under two to three years. But there’s no universal cutoff. The right test is simply whether your break-even comes comfortably before you plan to sell or move.

How do I calculate my refinance break-even point? Divide your total closing costs by your monthly savings. If a refinance costs $8,000 and lowers your payment by $200 a month, you break even in 40 months. After that point, the monthly savings are money in your pocket; before it, you haven’t recouped the cost yet.

Should I refinance if I can lower my rate by 1%? Not automatically. A one-point drop helps, but if your closing costs are high or you’ll move before the break-even month, it can still lose money. Run the break-even calculation against how long you’ll actually keep the loan rather than relying on the rate drop alone.

The bottom line

A lower rate feels like a win, which is exactly why refinance offers are pitched on the rate. But the rate is only half the trade. The other half is what you pay to get it, and how long you’ll be around to collect the savings.

Do the one-line math before you sign anything: total closing costs divided by monthly savings equals your break-even month. If you’ll still own the home comfortably past that month, refinancing is a smart move. If you won’t, the best rate in the world is still a loss. My friend nearly learned that the expensive way. The calculation takes about a minute.

→ Get your Worth It Score: worthitcalculators.com/refinance-break-even

Related tools: see how much the rate itself changes things with the mortgage payment calculator, and if you’re weighing other borrowing, check the true cost of a loan before you commit.

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