Mortgage Refinance Break-Even Calculator
The break-even point is the one number that tells you whether refinancing is truly worth it. Enter your numbers to get the exact month you start saving — plus the specific calendar date.
Calculate Your Break-Even Point
Required fields: current rate, new rate, balance, and closing costs. Optional fields improve precision.
Understanding Break-Even: The Exact Formula
The refinance break-even formula is simple but has important nuances that most online calculators ignore:
Break-Even (months) = Net Closing Costs ÷ Monthly Savings
Net Closing Costs = Lender Fees + Title Fees + Points − Lender Credits
Monthly Savings = Old Payment − New Payment + PMI Eliminated
Why "Net" Closing Costs Matter
Many homeowners calculate break-even using the gross closing cost figure from their estimate. But if you're receiving lender credits (in exchange for a slightly higher rate), those credits directly reduce your net cost outlay — and thus shorten your break-even. Similarly, discount points you pay to buy down the rate add to net costs.
PMI Elimination Changes Everything
If refinancing eliminates your PMI payment (because your new LTV falls below 80%), add that monthly PMI amount directly to your savings figure before calculating break-even. A homeowner saving $150/month on their rate plus eliminating $180/month of PMI has $330/month in total savings — a dramatically shorter break-even than the rate savings alone would suggest.
Break-Even Benchmarks
| Break-Even Period | Verdict | Best When... |
|---|---|---|
| Under 12 months | Excellent | Virtually always worth refinancing |
| 13–24 months | Very Good | Planning to stay 3+ years |
| 25–36 months | Good | Planning to stay 5+ years |
| 37–48 months | Moderate | Certain you'll stay 7+ years |
| 49–60 months | Marginal | Long-term homeowner, very stable plans |
| Over 60 months | Not Recommended | Rarely worth it unless plans are ironclad |
Break-even is a forward-looking estimate based on staying in the home. Life changes — jobs, family, health — often move people before they planned. Research from the National Association of Realtors consistently shows homeowners underestimate how soon they'll move. Weight a 3-year break-even differently if you have a toddler (school decisions ahead), work remotely but could be recalled, or have aging parents in another city.
How to Reduce Your Break-Even Period
If your current break-even is longer than ideal, here are practical ways to shorten it before applying:
- Improve your credit score first. Moving from 680 to 740 can reduce your rate by 0.25–0.5%, meaningfully increasing monthly savings and shortening break-even.
- Shop aggressively for closing costs. Title insurance, settlement fees, and origination charges can vary by $1,000–$3,000 between lenders for the same loan. Every dollar saved in closing costs directly reduces break-even months.
- Accept lender credits strategically. If your break-even is already 48 months, accepting a 0.125% higher rate for $2,500 in credits reduces net costs significantly — at a slight ongoing monthly cost that matters less over your expected stay.
- Choose a shorter term loan. A 20-year refinance typically offers rates between a 15-year and 30-year. If you can afford slightly higher payments, the rate savings are greater and break-even shortens.
- Time your closing to minimize prepaid interest. Closing near the end of the month minimizes the days of prepaid interest at closing — a modest but real cost reduction.
The Hidden Cost of Resetting Your Loan Term
Break-even analysis captures closing costs vs. monthly savings, but it misses a critical dimension for homeowners mid-loan: resetting your amortization schedule.
If you've been paying a 30-year mortgage for 8 years and you refinance into a new 30-year mortgage, you now have 30 more years of payments — 8 years longer than your original loan. Even at a lower rate, you'll pay substantial additional total interest just from the term extension.
| Scenario | Monthly Payment | Total Interest Paid | Payoff Year |
|---|---|---|---|
| Stay on current loan (7%, 22 yrs left) | $1,996 | $189,000 remaining | 2048 |
| Refi to 30-yr at 6.5% | $1,896 | $382,000 total | 2056 |
| Refi to 22-yr at 6.5% | $2,052 | $201,000 total | 2048 |
| Refi to 15-yr at 6.0% | $2,532 | $105,600 total | 2041 |
Illustrative example: $285,000 balance. Monthly payment comparison is useful for budgeting; total interest comparison shows the true long-term cost.
The 30-year refinance has the lowest monthly payment but costs far more in total interest and extends debt by 8 years. A 22-year loan matches your original payoff date at slightly lower monthly cost. The 15-year option dramatically reduces total interest but raises monthly payments significantly.
The right choice depends on your priority: monthly cash flow, total interest, or payoff date. None of these dimensions is captured by simple break-even math alone.
Full Refinance Analysis in 60 Seconds
Our main calculator adds verdict classification, lifetime savings, and a complete payment breakdown to the break-even analysis you just ran.
Open Full Calculator →Frequently Asked Questions
Does break-even account for the opportunity cost of closing costs?
Simple break-even does not — it treats money paid at closing as a flat sunk cost. A more rigorous analysis would compare the investment return you could earn if you invested the closing costs instead of paying them. For most homeowners making a refinance decision, this adjustment changes the break-even by only 1–3 months at typical savings rates, which doesn't materially affect the decision.
Should I use the simple break-even formula or the after-tax break-even?
For most homeowners, the simple formula is accurate enough. After-tax break-even matters only if you itemize deductions and your tax savings on mortgage interest differ significantly between the two loans. Since the 2017 TCJA dramatically increased the standard deduction, fewer than 12% of taxpayers now itemize — making the tax-adjusted calculation irrelevant for most filers.
My break-even is 28 months but I might sell in 3 years — should I refinance?
This is a borderline case requiring honest self-assessment. If 3 years is a firm, well-reasoned plan (e.g., planned retirement, known job transfer, kids starting college), the thin margin doesn't justify refinancing. If 3 years is a rough guess and you've lived in the home 8+ years with no pressing reason to move, the margin is probably acceptable. The risk you're hedging against is selling at month 25 — one month before recovering your costs.