Costs ÷ Savings
= months to break even
A refinance replaces your current mortgage with a new one, usually to get a lower rate, a different term, or cash out of your equity. It sounds like free money when rates fall, but it isn't free: you pay a fresh round of closing costs, and the new loan often restarts the clock on your payoff. Whether refinancing is worth it comes down to two questions. How fast do the savings repay the upfront cost? And does the new loan actually reduce what you pay over the years you'll keep it? This guide shows you how to answer both, with three worked examples that land on very different verdicts.
Check Your Numbers With the Refinance Calculator →The single most useful refinance test is the break-even point: the number of months it takes for your monthly savings to pay back your closing costs.
Break-even months = total closing costs ÷ monthly payment savings
If a refinance costs $6,000 and lowers your payment by $300, you break even in 20 months. Every month you keep the loan after that is genuine savings. If you sell, move, or refinance again before month 20, you've lost money on the deal, because you paid $6,000 to save less than $6,000.
That's why the right answer depends on your plans as much as on the rate. A homeowner who expects to stay ten more years can justify a refinance with a 40-month break-even. Someone who may relocate for work in two years should be skeptical of anything above 18 or so. As a rough guide, many people look for a break-even under about three years, then confirm the lifetime numbers below.
Closing costs on a refinance typically run 2% to 6% of the loan amount and include the lender's origination fee, an appraisal, title insurance, recording fees, and any discount points you buy to lower the rate. Use the actual figure from your Loan Estimate, not a guess - it moves the break-even more than anything else.
You'll often hear "refinance when rates fall 1 point." That rule is a blunt instrument. What matters is the dollar savings relative to your costs, and that scales with your balance. Here is a $300,000 loan at 7%, refinanced into a new 30-year loan with $6,000 in closing costs:
| New Rate | New Payment | Monthly Savings | Break-Even |
|---|---|---|---|
| 6.75% (-0.25) | $1,945.79 | $50.11 | ~120 months |
| 6.50% (-0.50) | $1,896.20 | $99.70 | ~60 months |
| 6.25% (-0.75) | $1,847.15 | $148.76 | ~40 months |
| 6.00% (-1.00) | $1,798.65 | $197.26 | ~30 months |
| 5.50% (-1.50) | $1,703.37 | $292.54 | ~21 months |
| 5.00% (-2.00) | $1,610.46 | $385.44 | ~16 months |
The current payment in every row is $1,995.91 (principal and interest on $300,000 at 7% over 30 years). A quarter-point drop takes a decade to pay off, which almost never makes sense. A half-point drop is borderline and depends on how long you'll stay. At a full point, the math starts working for most people. Double the balance to $600,000 and every savings figure doubles while the closing costs grow more slowly, so the break-even shortens and a smaller drop becomes worthwhile.
The break-even point tells you how fast you recover your costs. It doesn't tell you whether the new loan is cheaper overall. These three scenarios show why you need both checks. All figures are principal and interest only.
You owe $300,000 at 7.5% with 28 years left. Your payment is $2,138.60. You refinance into a new 30-year loan at 6.25% with $6,000 in closing costs. The new payment is $1,847.15, saving $291.45 a month, so you break even in about 21 months ($6,000 ÷ $291.45 = 20.6).
Lifetime check: the old loan would charge about $418,571 in remaining interest. The new one charges about $364,975. Even though you added two years to the payoff, you still save about $53,596 in interest, or about $47,596 after closing costs. If you keep paying the old $2,138.60 into the new loan, you'd finish years early and save far more. Verdict: refinance.
You owe $220,000 at 6.5% with 20 years left, paying $1,640.26 a month. A lender offers a new 30-year loan at 5.75% with $5,000 in costs. The new payment is $1,283.86, a satisfying $356.40 a month lower, with a break-even of only 14 months. On the surface it looks like the best deal of the three.
It isn't. Stretching 20 remaining years back out to 30 means paying interest for an extra decade. Remaining interest on the old loan is about $173,663; on the new loan it's about $242,190. You'd pay roughly $68,527 more in interest, or about $73,527 more once closing costs are included. The lower payment is real, but you're buying it with a much larger total bill. Verdict: only refinance into a 20-year (or shorter) term, or commit to paying extra each month.
You owe $250,000 at 7% with 25 years left, paying $1,766.95. You refinance into a 15-year loan at 5.75% with $5,500 in costs. The payment rises to $2,076.03, about $309 more each month, so there's no break-even in the usual sense: you're paying more monthly on purpose.
The payoff is in the lifetime numbers. Remaining interest falls from about $280,084 to about $123,685, a saving of roughly $156,400 (about $150,900 after costs), and you're debt-free ten years sooner. Verdict: refinance if the higher payment fits comfortably in your budget. The 15-year vs. 30-year guide covers that trade-off in depth.
| Scenario | Monthly Change | Break-Even | Net Lifetime Result |
|---|---|---|---|
| A: 7.5% (28 yrs) to 6.25% (30 yrs) | -$291.45 | ~21 months | Saves ~$47,596 |
| B: 6.5% (20 yrs) to 5.75% (30 yrs) | -$356.40 | ~14 months | Costs ~$73,527 more |
| C: 7% (25 yrs) to 5.75% (15 yrs) | +$309.08 | n/a | Saves ~$150,900 |
A rate-and-term refinance keeps your balance about the same and changes only the rate, the term, or both. Every example above is rate-and-term. A cash-out refinance replaces your loan with a larger one and hands you the difference in cash. Cash-out loans usually carry slightly higher rates, and lenders commonly cap them at around 80% of the home's value.
Cash-out makes the most sense when your existing rate is already close to today's rates and you need a large lump sum for something durable, such as a renovation that adds value. If your current rate is far below market, refinancing the whole balance just to access cash can be expensive. In that case a HELOC lets you borrow against equity while leaving your low first-mortgage rate untouched.
The examples above use the same standard amortization formula lenders use. To test your own loan, you need four numbers from your current mortgage statement and a Loan Estimate: your balance, current rate, years remaining, and the new rate, term, and closing costs. The calculator returns your new payment, monthly savings, break-even months, and lifetime interest saved, so you can apply both checks from this guide in about a minute.
Open the Mortgage Refinance Calculator →Divide your total closing costs by your monthly savings to find your break-even point in months. If you'll keep the loan well past that point, and the new loan doesn't add more lifetime interest than it saves, the refinance is usually worth it.
For example, $6,000 in costs and $300 a month in savings breaks even in 20 months.
The traditional rule is 1 percentage point, but the break-even point matters more. On a $300,000 loan at 7% with $6,000 in costs, a 0.5-point drop breaks even in about 60 months, while a 1-point drop breaks even in about 30.
Larger balances make smaller rate drops worthwhile, because the dollar savings grow faster than the closing costs.
Yes. Refinancing into a new 30-year loan when you only have 20 years left stretches the debt over 10 extra years. Your payment drops, but total interest can rise by tens of thousands of dollars.
Compare total remaining interest on both loans, or refinance into a term that matches the years you have left.
At least longer than your break-even point, ideally with a comfortable margin. With a 24-month break-even, a refinance makes little sense if you might sell within two to three years, because you'd pay the closing costs without recovering them.
It can be if you expect to move or refinance again within a few years. The lender covers the costs in exchange for a higher rate, or adds them to your balance. That removes the break-even risk but costs more over a long holding period.
Usually when you plan to move before the break-even point, when you're deep into your current loan and would restart a long term, when your credit score has dropped enough to raise your new rate, or when you'd take cash out to fund spending rather than a lasting improvement.
If the higher payment fits comfortably, a shorter term usually produces the largest lifetime savings. Moving a $250,000 balance from 7% with 25 years left to a 15-year loan at 5.75% raises the payment by about $309 a month but cuts remaining interest by roughly $156,000.