Compare old and new mortgage payments.
Break-Even Months = Closing Costs / (M_current − M_new) where M = P × [r(1+r)^n] / [(1+r)^n − 1]
The break-even point is calculated in two stages. First, compute the new monthly payment using the standard amortization formula. Then, subtract the new payment from the current payment to find the monthly savings. Finally, divide the total closing costs by the monthly savings to find how many months it takes to break even.
Monthly Payment Formula (Amortization):
For both the current and new loan, the fixed monthly payment is:
M = P × [r(1+r)^n] / [(1+r)^n − 1]
Break-Even Months:
Break-Even Months = Closing Costs / (M_current − M_new)
Note: Results are estimates. Actual savings may differ depending on taxes, escrow, PMI, and lender-specific fees. Consult a licensed mortgage professional before making refinancing decisions.
**Step 1 — Current monthly payment:** r_current = 7.00% / 12 = 0.005833 M_current = 300,000 × [0.005833 × (1.005833)^360] / [(1.005833)^360 − 1] (1.005833)^360 ≈ 8.1165 M_current = 300,000 × [0.005833 × 8.1165] / [8.1165 − 1] = 300,000 × 0.047346 / 7.1165 = 300,000 × 0.006653 ≈ $1,995.91 **Step 2 — New monthly payment:** r_new = 5.50% / 12 = 0.004583 M_new = 300,000 × [0.004583 × (1.004583)^360] / [(1.004583)^360 − 1] (1.004583)^360 ≈ 5.1797 M_new = 300,000 × [0.004583 × 5.1797] / [5.1797 − 1] = 300,000 × 0.023739 / 4.1797 = 300,000 × 0.005682 ≈ $1,703.37 **Step 3 — Monthly savings:** Savings = $1,995.91 − $1,703.37 = $292.54/month **Step 4 — Break-even months:** Break-Even = $6,000 / $292.54 ≈ 20.51 months
Result: Break-even point: approximately **21 months** (about 1 year and 9 months). Monthly savings: **$292.54**. Total interest saved over the full 30-year term (vs. remaining payments at old rate): approximately **$105,315**.
In this example, it takes just under 21 months to recoup the $6,000 in closing costs through monthly payment savings of $292.54. If you plan to stay in the home longer than 21 months, refinancing at 5.50% makes strong financial sense. If you expect to sell or move within 1–2 years, the savings may not fully cover the upfront costs.
The longer you remain in the home after the break-even point, the greater your total savings. Over the full 30-year term, the lower rate saves over $105,000 in interest — a compelling reason to refinance if you are staying put long-term.
Refinancing replaces your existing mortgage with a new loan, ideally at a lower interest rate or with better terms. The core trade-off is straightforward: you pay upfront closing costs in exchange for lower monthly payments (and lower total interest) over the life of the loan.
| Type | Purpose | |---|---| | Rate-and-term refinance | Lower the interest rate and/or change the loan term | | Cash-out refinance | Borrow more than you owe to access home equity as cash | | Streamline refinance | Simplified process for FHA/VA loans with less documentation |
Closing costs on a refinance typically range from 2% to 5% of the loan balance. Common line items include:
Some lenders offer no-closing-cost refinances, where costs are rolled into the loan balance or offset by a higher rate. These can be useful if you plan to move soon, but cost more over time.
One often-overlooked factor: when you refinance into a new 30-year loan after already paying 5–10 years on your original mortgage, you are restarting the clock. Even at a lower rate, total interest paid over the extended period may exceed what you would have paid by continuing with your original loan. Always compare total interest cost, not just monthly payment.
Disclaimer: Results produced by this calculator are estimates for educational purposes only. They do not account for taxes, insurance, PMI, HOA fees, or individual lender adjustments. Consult a licensed mortgage professional or financial advisor before making any refinancing decision.
At a rate reduction of 1.5 percentage points (e.g., from 7% to 5.5%) on a $300,000 30-year mortgage, you save approximately $292 per month and over $105,000 in total interest over the life of the loan. The exact amount depends on the remaining term and your new loan term.
It depends on your loan balance and closing costs. On a $300,000 loan, a 0.5% rate reduction saves roughly $95–$100 per month. With $5,000 in closing costs, the break-even is about 50–53 months. If you plan to stay over 4–5 years, it can be worthwhile. Use the calculator to run your specific numbers.
When you refinance into a new 30-year loan, your term resets to 30 years from the new closing date. This means you extend the total payback period. To avoid this, some borrowers refinance into a shorter-term loan (e.g., 15 or 20 years) to match their remaining payoff timeline while still capturing a lower rate.
Multiply the monthly savings by the number of remaining months on the new loan, then subtract the closing costs. For a more precise figure, calculate the total interest paid under both the old and new amortization schedules and take the difference. Our calculator handles this automatically.
Most financial advisors consider a break-even period of 24 months (2 years) or less to be favorable, especially if you plan to stay in the home long-term. Break-even periods up to 36–48 months may still be worthwhile depending on your plans, but beyond 5 years the benefits become less certain.
For the break-even calculation, enter only the true out-of-pocket closing costs — origination, appraisal, title, and recording fees. Prepaid items like escrow deposits are not a cost you lose; they are funds held on your behalf and typically returned when you close the old loan.
Yes, briefly. A refinance application triggers a hard credit inquiry, which may reduce your score by a few points temporarily. However, if the refinance results in lower overall debt costs and you maintain on-time payments, your score typically recovers within a few months.
A no-closing-cost refinance rolls the closing costs into the new loan balance or compensates the lender through a slightly higher interest rate. While you avoid upfront out-of-pocket expenses, you will pay more in interest over time. This option can make sense if you plan to sell or refinance again within a few years.
Yes — the break-even formula works for any fixed-rate installment loan. Enter the remaining balance, current rate, new rate, remaining term, and estimated refinancing fees (if any) to determine whether refinancing the auto loan or personal loan is worthwhile.
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