Refinance if you will stay past the break-even point (closing costs divided by monthly savings) and the total lifetime cost goes down, not just the payment. A $6,000 refinance that saves $314 a month breaks even in about 20 months.
Danny bought his house when rates were high and locked in at 7.25%. He still owes $300,000 with 27 years to go, and his principal and interest payment is $2,113 a month. Now a lender is calling with an offer: 6.00%, new 30-year loan, about $6,000 in closing costs. “Save over $300 a month.” It sounds like free money. It might be. Or it might quietly cost him more than it saves.
Whether you should refinance your mortgage comes down to three questions, and you can answer all of them with your own numbers in about ten minutes.
The three-question test
- Will you stay past the break-even point? Closing costs are paid upfront. Monthly savings pay them back slowly. If you sell or refinance again before they’re paid back, you lost money.
- Does the total cost go down, not just the payment? A lower payment can hide a higher lifetime cost if you stretch the loan back out to 30 years.
- Do you qualify for the rate you’re being quoted? Credit score, income and how much equity you have all affect the offer. The rate in the ad is not always your rate.
If the answer to all three is yes, refinancing is usually worth it. If any is no, slow down.
How to calculate your break-even point
This is the most important number in any refinance:
Break-even (months) = closing costs ÷ monthly savings
For Danny:
- Current payment: $2,113. New payment at 6.00% over 30 years: $1,799.
- Monthly savings: $2,113 − $1,799 = $314.
- Break-even: $6,000 ÷ $314 = about 19.1, so it takes 20 months to earn the closing costs back.
If Danny is confident he’ll stay in the house more than about two years, the refinance passes the first test. If there’s a real chance he’ll move for work next year, it fails, no matter how good the rate looks.
Worked example: what different rates do for Danny
The old rule of thumb said “only refinance if rates drop a full percentage point.” It’s too blunt. A smaller drop can work if closing costs are low and you’ll stay a long time. A bigger drop can fail if you’re about to move. Here’s Danny’s $300,000 balance at 7.25% with 27 years left, refinanced into a new 30-year loan with $6,000 in closing costs:
| New rate | Monthly change | Break-even | Lifetime interest + costs |
|---|---|---|---|
| 6.75% | Save $167 | 3 years | Cost $22,009 more |
| 6.50% | Save $216 | 2 years 4 months | Cost $4,157 more |
| 6.25% | Save $265 | 1 year 11 months | Save $13,502 |
| 6.00% | Save $314 | 1 year 8 months | Save $30,962 |
| 5.50% | Save $409 | 1 year 3 months | Save $65,264 |
Look at the 6.50% row. Danny’s payment drops $216 a month and he breaks even in a little over two years. And yet over the life of the loan he pays about $4,000 more. How?
The reset-the-clock trap
Danny has 27 years left. A new 30-year loan adds 3 years of payments back on. Part of that lower monthly payment isn’t a better rate at all. It’s just spreading the same debt over more time.
The trap gets worse the further along you are. Take Rosa. She owes $120,000 at 7.25% with 18 years left, paying $996 a month. She’s offered 6.00% with $6,000 in closing costs.
| Rosa’s option | Monthly change | Lifetime interest + costs |
|---|---|---|
| New 30-year at 6.00% | Save $277 a month | Cost $49,825 more |
| New 15-year at 6.00% | Pay $16 a month more | Save $26,908 |
The 30-year refinance feels great every month and costs her almost $50,000. The 15-year refinance barely changes her payment, finishes 3 years sooner, and saves her nearly $27,000. Same rate, opposite outcomes. The only difference is the term.
Picking the new term
Here are Danny’s options at 6.00% with $6,000 in closing costs:
| New term | New payment | Monthly change | Lifetime interest + costs |
|---|---|---|---|
| 30 years | $1,799 | Save $314 | Save $30,962 |
| 20 years | $2,149 | Pay $37 more | Save $162,646 |
| 15 years | $2,532 | Pay $419 more | Save $222,794 |
The 20-year option is the quiet winner here. For $37 a month more than he pays today, Danny finishes 7 years sooner and saves about $162,000 over the life of the loan. When the new payment is higher, the calculator shows the break-even as “Never” because there are no monthly savings to recover costs from. In that case, judge it by the lifetime line instead.
There’s also a fourth option. Danny can take the 30-year loan at 6.00% for its lower required payment but keep paying his old $2,113 anyway. At that pace he’d pay it off in about 20 years 9 months with about $224,000 in interest. Add the $6,000 in closing costs and he still saves roughly $154,000 compared to keeping his current loan, with the flexibility to drop to $1,799 in a bad month. It only works if he really keeps paying the higher amount. Automate it.
For more on how loan length changes total interest, see 15-year vs 30-year mortgage.
Run your own numbers:
You’ll need your current balance and rate (on your latest mortgage statement), the years left, and a Loan Estimate from at least one lender with the new rate and closing costs. The calculator compares principal and interest only, since property tax and insurance don’t change when you refinance.
What refinancing really costs
Closing costs on a refinance often run somewhere around 2% to 5% of the loan amount: appraisal, title, origination and lender fees, recording fees and prepaid items. On Danny’s $300,000 balance that’s $6,000 to $15,000. It varies a lot by lender and state, which is why getting more than one quote matters.
- “No-closing-cost” refinance. The costs don’t disappear. The lender either adds them to your balance or charges a higher rate. That can still make sense if you might move in a few years, but compare it honestly.
- Rolling costs into the loan. You pay interest on them for the life of the loan.
- Discount points. Paying points upfront buys a lower rate. One point is 1% of the loan. Points only pay off if you keep the loan long enough, so run a separate break-even on them.
Other good reasons to refinance
- Getting rid of mortgage insurance. If your home has gained value and you now have 20% or more equity, refinancing an FHA loan into a conventional loan can drop mortgage insurance. On a conventional loan, you can often ask your servicer to remove PMI without refinancing at all.
- Switching from an adjustable rate to a fixed rate before an adjustment you can’t afford.
- Removing a co-borrower after a divorce or separation.
A cash-out refinance, where you borrow more than you owe and take the difference in cash, is a different decision. Using your house to pay off credit cards turns unsecured debt into debt secured by your home, and stretches it over decades. If the spending that created the debt hasn’t changed, the cards often fill back up.
When not to refinance
- You might move before the break-even point.
- You’re far into your loan and the only way to save monthly is to restart a 30-year clock.
- Your credit score has dropped since you bought. The rate you’re offered may be much worse than the advertised one.
- You have little equity. Less than 20% can mean mortgage insurance on the new loan, which eats the savings.
- The plan is to lower the payment and spend the difference. A lower payment is only progress if the savings go somewhere useful, like your emergency fund or retirement.
Common mistakes
- Looking only at the monthly payment. Always check the lifetime total too.
- Taking the first offer. Your current servicer isn’t always the cheapest. Get Loan Estimates from two or three lenders around the same time and compare rate and fees side by side.
- Refinancing repeatedly. Every refinance has closing costs, and every new 30-year loan starts you back at the most interest-heavy part of the schedule.
- Forgetting the timeline. Expect a few weeks from application to closing, plus an appraisal. Rate locks expire.
What to do this week
- Find your latest mortgage statement and write down your balance, rate, and years left.
- Check your credit score. Most banks and card issuers show it for free.
- Request Loan Estimates from at least two lenders for the same loan amount and term.
- Run each offer through the calculator. Write down the break-even and the lifetime line.
- Run the same offer as a shorter term. Often the 15- or 20-year version is the real deal.
- Be honest about how long you’ll stay. If you’re not sure you’ll pass the break-even, wait.
One money decision, one number worth knowing, one mindset shift. Free, every week.
Frequently asked questions
How much does the rate need to drop to refinance?
There’s no fixed number. The old “1% rule” is a rough guide at best. What matters is whether you’ll stay past the break-even point and whether the lifetime cost goes down. In the example above, a 1-point drop pays back closing costs in under two years.
How do I calculate the break-even on a refinance?
Divide your total closing costs by the monthly savings. $6,000 in costs and $314 a month in savings means about 20 months to break even.
Does refinancing hurt your credit?
Applying causes a hard inquiry, which can lower your score slightly for a short time. Rate shopping with several mortgage lenders within a short window is generally treated as a single inquiry by the major scoring models.
Can I refinance to a shorter term?
Yes, and it’s often the best use of a lower rate. Refinancing into a 15- or 20-year loan can keep your payment close to what it is now while cutting years and tens of thousands of dollars in interest.
Is it worth refinancing to save $100 a month?
It depends on the closing costs and how long you’ll stay. With $4,000 in costs, $100 a month takes 40 months to break even. If you’ll stay well past that and you’re not resetting to a much longer term, it can be worth it.
Keep reading
- How Much House Can You Really Afford? The Complete Guide
- 15-Year vs. 30-Year Mortgage: Which Saves You More?
- Rent vs. Buy: How to Decide With Real Numbers
Education, not financial advice. The numbers here are examples; talk to a licensed professional about your own situation. Some links may be sponsored or affiliate links; see our disclosure.
