Calculate your refinancing break-even: Refinance Calculator →
The Break-Even Calculation — The Only Number That Matters
Refinancing replaces your existing mortgage with a new one at (ideally) a lower rate. The new rate reduces your monthly payment. But refinancing costs 2%–5% of the loan balance in closing costs — which you pay upfront (or roll into the loan, which means paying interest on them). The break-even is when your accumulated monthly savings equal your closing costs. Before break-even, refinancing has cost you money. After it, every month saves money.
Break-Even Months = Total Closing Costs ÷ Monthly Payment Savings
Example: $400,000 mortgage, refinancing from 7.5% to 6.5%, closing costs $10,000.
Old payment: $2,797. New payment: $2,528. Monthly savings: $269.
Break-even: $10,000 ÷ $269 = 37 months (3.1 years).
If you plan to stay in the home for more than 3.1 years, refinancing saves money. If you'll sell sooner, the closing costs aren't recovered. Most financial planners recommend refinancing only when the break-even is under 3–4 years, though this varies by personal situation.
The 1% Rule — Useful Shortcut, Not a Hard Threshold
The traditional "1% rule" says refinancing makes sense when you can drop your rate by at least 1%. This is a reasonable rule of thumb for a typical 30-year, $300,000–$500,000 mortgage where a 1% rate reduction saves $150–$250/month and closing costs run $6,000–$10,000. At those numbers, break-even falls around 2–4 years.
The rule breaks down for large loans (where even 0.5% saves a lot) and small loans (where 1.5% savings barely covers closing costs). A $700,000 loan at a 0.75% reduction saves $394/month — break-even under 2 years with $7,000 in closing costs. A $150,000 loan at 1% saves $85/month — break-even is 8+ years. Calculate your specific break-even rather than relying on the rule of thumb.
When Refinancing Clearly Makes Sense
Your Rate Is Significantly Above Current Market
If you bought in 2023–2024 at 7.5%–8% and rates have fallen to 6%–6.5%, you have a clear refinancing opportunity. A 1.5% reduction on a $450,000 loan saves about $400/month — breaking even in under 2 years even with $9,000 in closing costs. Monitor rates and have your loan ready to go when the spread justifies it.
You're Converting an ARM Before Adjustment
If your ARM's initial fixed period is ending and you want certainty (or the rate environment suggests adjustments will be unfavorable), refinancing to a fixed mortgage before the first adjustment removes rate risk. The math is: compare your expected ARM payment after adjustment vs. the fixed-rate payment, then calculate the break-even on the refinancing costs against that difference.
Switching from 30-Year to 15-Year
Refinancing from a 30-year to a 15-year mortgage typically increases the monthly payment but dramatically reduces total interest — 15-year rates are usually 0.5%–0.75% lower than 30-year rates, and the shorter term further cuts total interest paid. This isn't about break-even in the traditional sense; it's a deliberate decision to pay more monthly in exchange for being mortgage-free 15 years sooner and saving tens of thousands in interest.
When Refinancing Is a Mistake
You're Rolling Closing Costs Into the Loan
Rolling closing costs into the new loan avoids upfront payment but means you're paying interest on those costs for the life of the loan. On a $10,000 rolled cost at 6.5% for 30 years, you pay ~$22,700 total — more than double the original cost. If you're rolling costs in, your effective rate is higher than the stated rate. Ideally, pay closing costs out-of-pocket if you have the cash.
You're Late in the Mortgage Term
If you're 20+ years into a 30-year mortgage and refinancing to a new 30-year, you'll be restarting 30 years of payments — paying much more total interest even at a lower rate. Most of your principal has been paid; a new 30-year mortgage front-loads interest again. Refinancing into a 10 or 15-year term makes more sense at this stage, even at a similar rate, to avoid the total interest restart.
You Plan to Move Within 2 Years
If your break-even is 3 years and you're selling in 18 months, refinancing costs you money — period. Don't refinance based on the hope that you'll stay; calculate how likely your timeline is and make the decision based on realistic expectations.
| Rate Drop | Monthly Savings | Break-Even | Worth It If Staying... |
|---|---|---|---|
| 0.5% | $135 | 74 months | 6+ years |
| 1.0% | $269 | 37 months | 3+ years |
| 1.5% | $403 | 25 months | 2+ years |
| 2.0% | $537 | 19 months | 1.5+ years |
For a detailed comparison of ARM vs. fixed rate options, read ARM vs. fixed mortgage. To understand how ARM adjustments work before you decide whether to refinance out of one, see how adjustable-rate mortgages work.
Related Articles
Frequently Asked Questions
How much does the rate need to drop to justify refinancing?
The traditional "1% rule" is a rough guideline. The real answer depends on your loan size, closing costs, and how long you'll stay. Calculate the break-even: closing costs ÷ monthly savings = months to break even. If you'll stay longer than break-even, refinancing saves money. A 0.75% drop on a large loan may be better than a 1.5% drop on a small loan if the monthly savings cover costs faster.
How do I calculate refinancing break-even?
Break-even months = Total closing costs ÷ Monthly payment savings. Example: $10,000 closing costs, $300/month savings = 33 months (2.75 years) break-even. Stay longer than break-even and refinancing is profitable. Leave sooner and it costs money. Use the Refinance Calculator for your exact numbers.
What are typical refinancing closing costs?
Typically 2%–5% of the loan balance. On a $400,000 mortgage: $8,000–$20,000. Major components: origination fee, appraisal ($400–$700), title insurance ($1,000–$2,000), and prepaid items. Some lenders offer no-closing-cost refinances (costs rolled into rate or loan balance) — these trade upfront savings for higher total cost over the loan.
Should I refinance if rates drop 0.5%?
It depends. On a $600,000 loan, 0.5% saves $190/month. With $12,000 in closing costs, break-even is 63 months (5.3 years). If you'll stay 5+ years, yes. On a $200,000 loan, 0.5% saves $63/month. With the same $12,000 costs, break-even is 190 months — not worth it unless you plan to stay 16 years. Always calculate your specific break-even.
When should I refinance an ARM to a fixed rate?
Refinance an ARM to fixed when: your ARM's initial period is ending and current fixed rates are acceptable, you've decided to stay longer than originally planned, or you're uncomfortable with payment uncertainty regardless of rate level. Don't refinance based on fear of future rate increases alone — calculate whether the current fixed rate justifies the closing costs given your timeline.